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|---|---|---|---|---|---|---|---|---|---|---|---|---|
ART001997817 | oai_dc | Finite Element Analysis for Fracture Resistance of Fiber-reinforced Asphalt Concrete | Finite Element Analysis for Fracture Resistance of Fiber-reinforced Asphalt Concrete | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"백종은(서울시 품질시험소 도로포장연구센터); 유평준(한국건설기술연구원)"
] | PURPOSES : In this study, a fracture-based finite element (FE) model is proposed to evaluate the fracture behavior of fiber-reinforced asphalt (FRA) concrete under various interface conditions.
METHODS: A fracture-based FE model was developed to simulate a double-edge notched tension (DENT) test. A cohesive zone model (CZM) and linear viscoelastic model were implemented to model the fracture behavior and viscous behavior of the FRA concrete, respectively.
Three models were developed to characterize the behavior of interfacial bonding between the fiber reinforcement and surrounding materials. In the first model, the fracture property of the asphalt concrete was modified to study the effect of fiber reinforcement. In the second model, spring elements were used to simulated the fiber reinforcement. In the third method, bar and spring elements, based on a nonlinear bond-slip model, were used to simulate the fiber reinforcement and interfacial bonding conditions. The performance of the FRA in resisting crack development under various interfacial conditions was evaluated.
RESULTS : The elastic modulus of the fibers was not sensitive to the behavior of the FRA in the DENT test before crack initiation. After crack development, the fracture resistance of the FRA was found to have enhanced considerably as the elastic modulus of the fibers increased from 450 MPa to 900 MPa. When the adhesion between the fibers and asphalt concrete was sufficiently high, the fiber reinforcement was effective. It means that the interfacial bonding conditions affect the fracture resistance of the FRA significantly.
CONCLUSIONS: The bar/spring element models were more effective in representing the local behavior of the fibers and interfacial bonding than the fracture energy approach. The reinforcement effect is more significant after crack initiation, as the fibers can be pulled out sufficiently.
Both the elastic modulus of the fiber reinforcement and the interfacial bonding were significant in controlling crack development in the FRA. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001997818 | oai_dc | 접착식 콘크리트 덧씌우기를 위한 초속경화 첨가재 현장 혼합폴리머 개질 콘크리트의 적용성 연구 | Application of In-Situ Mixing Hydration Accelerator on Polymer Modified Concrete for Bonded Concrete Overlay | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김영규(강릉원주대학교); 홍성재(강릉원주대학교); 이승우(강릉원주대학교)"
] | PURPOSES : Recently, bonded concrete overlay has been used as an alternative solution in concrete pavement rehabilitation since its material properties are similar to those of the existing concrete pavements. Deteriorated concrete pavements need rapid rehabilitation in order to prevent traffic jams on Korean expressways. Moreover, speedy and effective repair methods are required. Therefore, the use of bonded concrete overlay with ultra-rapid hardening cement has increased in an effort to reopen promptly the expressways in Korea. However, mobile mixer is required for ultra-rapid hardening cement concrete mixing in the construction site. The use of mobile mixer causes various disadvantages aforementioned such as limitation of the construction supply, open-air storage of mixing materials, increase in construction cost, and etc. In this study, therefore, hydration accelerator in-situ mixing on polymer modified concrete produced in concrete plant is attempted in order to avoid the disadvantages of existing bonded concrete overlay method using ultra-rapid hardening cement.
METHODS: Bonded concrete overlay materials using ultra-rapid hardening cement should be meet all the requirements including structural characteristics, compatibility, durability for field application. Therefore, This study aimed to evaluate the application of hydration accelerator in-situ mixing on polymer modified concrete by evaluating structural characteristics, compatibility, durability and economic efficiency for bonded concrete overlay.
RESULTS : Test results of structural characteristics showed that the compressive, flexural strength and bond strength were exceed 21MPa, 3.15MPa and 1.4MPa, respectively, which are the target strengths of four hours age for the purpose of prompt traffic reopening. In addition, tests of compatibility, such as drying shrinkage, coefficient of thermal expansion and modulus of elasticity, and durability (chloride ions penetration resistance, freezing-thawing resistance, scaling resistance, abrasion resistance and crack resistance), showed that the hydration accelerator in-situ mixing on polymer modified concrete were satisfied the required criteria.
CONCLUSIONS: It was known that the hydration accelerator in-situ mixing on polymer modified concrete overlay method was applicable for bonded concrete overlay and was a good alternative method to substitute the existing bonded concrete overlay method since structural characteristics, compatibility, durability were satisfied the criteria and its economic efficiency was excellent compare to the existing bonded concrete overlay methods. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001997820 | oai_dc | 지방부 신호교차로 주 야간 교통사고 예측모형 개발 및 비교 분석 | Development of Traffic Accident Models at Rural Signalized Intersections by Day and Night | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이근희(한양대학교); 정상운(한양대학교); 박민호(한국건설기술연구원); 이동민(서울시립대학교); 노정현(한양대학교)"
] | PURPOSES : The purposes of this study are to compare the day and night characteristics and to develop the models of traffic accidents. in Rural Signalized Intersections METHODS : To develop day and night traffic accident models using the Negative Binomial Model, which was constructed for 156 signalized intersections of rural areas, through field investigations and casualty data from the National Police Agency.
RESULTS : Among a total of 17 variances, the daytime traffic accident estimate models identified a total of 9 influence factors of traffic accidents. In the case of nighttime traffic accident models, 11 influence factors of traffic accidents were identified.
CONCLUSIONS: By comparing the two models, it was determined that the number of main roads was an independent factor for daytime accidents. For nighttime accidents, several factors were independently involved, including the number of entrances to sub-roads, whether left turn lanes existed in major roads, the distances of pedestrian crossings to main roads and sub-roads, lighting facilities, and others. It was apparent that if the same situation arises, the probability of an accident occurring at night is higher than during the day because the speed of travel through intersections in rural areas is somewhat higher at night than during the day. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001997811 | oai_dc | 도로자산관리를 위한 서비스수준 기반 균형성과표 평가체계 개발 | Development of an Evaluation System of a LOS-based Balanced Scorecard for Road Infrastructure Asset Management | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"한대석(한국건설기술연구원); 유인균(한국건설기술연구원); 이수형(한국건설기술연구원)"
] | PURPOSES: This paper aims at the implementation of a balanced scorecard that can be widely applied to modern business management for use in the public road management sector.
METHODS: This study applied the newly developed LOS-based balanced scorecard system instead of a traditional Key Performance Index (KPI) for better decision making in asset management planning. As an evaluation technique, a“ hierarchical alignment and cascading method” is also suggested. Finally, the suggested system has been empirically applied to a regional government.
RESULTS : To provide stable and sustainable road services, the balanced scorecard informs the regional government of needed improvements in its asset management plans regarding budget optimization, structural management, the development of inner-business processes, and human resources.
CONCLUSIONS : An LOS-based balanced scorecard for managing road services and organizations in a quantitative manner has been successfully developed and tested through a field study. The developed scorecard is a timely topic and a useful analytical tool for coping with the new phases of an aging infrastructure, tighter budgets, and demand for greater public accountability. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001997815 | oai_dc | 도로의 야간 교통사고 저감을 위한 야광형 포장노면표시 기술개발의 적용성 연구 | A Study on the Application of Glow Line Marking Technology Development for Reducing Traffic Accidents at Nighttime | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이용문((주)평화엔지니어링); 김흥래((주)평화엔지니어링); 김상태((주)평화엔지니어링)"
] | PURPOSES: This study suggests the application of glow line marking technology for reducing traffic accidents at nighttime.
METHODS: In this study, using a statistical analysis, we analyzed the characteristics of traffic accidents occurring at nighttime. Next, the strength, weakness, opportunity, and threat (SWOT) factors were derived based on a current-status analysis of glow line marking technology and road environments. An SO strategy, ST strategy, WO strategy, and WT strategy were established in accordance with the four SWOT factors.
RESULTS : This study suggests that the following strategies should be promoted to apply glow line marking technology to a road environment: 1) an activation strategy for the technological development of glow line markings for a new paradigm in reducing traffic accidents, 2) a benefit enhancement strategy applying glow line marking technology in places where nighttime traffic accidents frequently occur, 3) a strategy for the expansion of glow line marking by replacing streetlights, and 4) a strategy for enhancing road applications through the development of various line marking methods in consideration of both performance and costs.
CONCLUSIONS : The application of glow line markings in a road environment can contribute to a reduction of traffic accidents at nighttime, and aid energy savings from the replacement of streetlights. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001997822 | oai_dc | 차량 가속특성에 따른 이산화탄소(CO2) 배출량 비교 | CO2 Emission Considering Condition of Vehicle Acceleration | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"주진윤(경기대학교); 오흥운(경기대학교)"
] | PURPOSES: The present study aims to evaluate the added CO2 emissions incurred from accelerating operation when to increase the speed up to the allowed level.
METHODS : The methodology used are basically the relationship between emission rates and vehicle speeds or acceleration rate. These rates together are used to calculate the added CO2 emissions incurred from accelerating operation.
RESULTS: It was resulted that the all the emission rates are increasing proportionally to vehicle speeds or acceleration rates. Additionally, it was also resulted that allowable speeds increasing, the added emission rates are increasing rapidly.
CONCLUSIONS: It may be concluded that if the allowable speed ranges are managed, CO2 emissions during vehicle operation are much reduced. From this reason, it was found that the allowable speed during highway design and operation would be much necessary | 토목공학 | null | kci_detailed_000163.xml | |||
ART001997813 | oai_dc | 택코트 첨가 가열아스팔트 혼합물의 고주파 동적저항 특성 및접착성능 평가에 대한 연구 | A Study for Evaluation of Hot Mixed Asphalt Mixtures with Tack-Coat Regarding High-Frequency Dynamic Resistance Performance and Bonding Property | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김도완((주)건화); 문성호(서울과학기술대학교)"
] | PURPOSES: A tack coat has been utilized to increase the bond performance between the surface layer and base course (intermediate course) at various road pavement sites. This is similarly true in other nations. Based on this connection, the objective of the present study is to evaluate the properties of hot mix asphalt (HMA) mixtures with an RSC-4 or BD-Coat and determine the application rate of the tack coat.
METHODS: The HMA specimens were manufactured using superpave gyratory compaction. The HMA mixtures were composed of a 5-cm thick surface layer and a 10-cm thick base course. An impact hammer resonance test (IHRT) and a static load shear test were conducted to evaluate the performance of the HMA mixtures with a tack coat. From these tests, the dynamic moduli related to the high-frequency resistance and interlayer shear strength (ISS) of HMA could be obtained.
RESULTS: The results of the dynamic moduli of HMA are discussed based on the resonance frequency (RF). To check the accuracy of the IHRT, we conducted a coherence analysis. A direct shear test using the application of a static load test was carried out to evaluate the interlayer shear strength (ISS) of HMA.
CONCLUSIONS: The maximum ISS was demonstrated at an RSC-4 application rate of 462 gsm, and the maximum dynamic modulus was demonstrated at an RSC-4 application rate of 306 gsm. By averaging the results of the ISS, the maximum ISS values were obtained when a BD-Coat application rate of 602 gsm was applied. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001997814 | oai_dc | 골재 입도분포가 도로포장용 롤러전압 콘크리트에 미치는 영향 연구 | A Study on the Gradation Effect of the Property of Roller Compacted Concrete Pavement | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"송시훈(강릉원주대학교); 이승우(강릉원주대학교)"
] | PURPOSES : The use of environmentally friendly construction methods has been recently encouraged to reduce fuel consumption and the effects of global warming. For this purpose, the roller compacted concrete pavement (RCCP) construction method has been developed. RCCP is more environmentally friendly and economically efficient than general concrete by reducing the amount of CO2 generated through the application of a smaller amount of cement. RCCP has a number of advantages such as an easy construction method, low cost, high structural hydration performance, and aggregate interlocking. However, mix design standards and construction guidelines of RCCP are required for domestic application. In addition, a study on aggregate selection, which has an effect on the characteristics of RCCP, is necessary owing to a limited number of researches. Thus, the aggregate effect on the performance of RCCP in securing the required strength and workability was evaluated in consideration of domestic construction.
METHODS : Sand and coarse aggregates of both 19mm and 13mm in maximum size were used in this study. Four types of aggregate gradations (s/a = 30%, 58%, and 70% for the sand and coarse aggregate of 19mm in maximum size, and s/a = 50% for a combination of the three types of aggregates) were set up to investigate the effects of the PCA band on the RCC characteristics. The conditions of s/a = 30% and 70% were evaluated to check the gradation effect outside of the recommended band. The conditions of s/a = 58% and 50% were used because they are the optimum combination of the two and three types of aggregates, respectively. RCCP gradation band was suggested gradation with a proper construction method of RCCP by synthetically comparing and analyzing the correlation of optimum water content, maximum dry density, and strength of requirements through its consistency and compaction test.
RESULTS : The lower and upper limit lines are insufficient to secure a relatively strong development and workability compared to an aggregate gradation in the RCCP gradation band region. On the other hand, the line in the RCCP gradation band and the 0.45 power curve in the RCCP gradation band region were satisfactory, ensuring the required strength and workability.
CONCLUSIONS: The suitable aggregate gradation on RCCP process should meet the RCCP gradation band area; however, fine particles passing through a #60 sieve do not need to be within the recommended gradation band because the influence of this region on such fine particles is small. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001997816 | oai_dc | 일반국도 현장조사 모니터링을 통한 장수명 아스팔트 덧씌우기포장의 공용성 분석 | Performance Evaluation of Long-Life Asphalt Concrete Overlays Based on Field Survey Monitoring in National Highways | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"백종은(서울시 품질시험소 도로포장연구센터); 임재규(한국건설기술연구원); 권수안(한국건설기술연구원); 권병윤(국토교통부)"
] | PURPOSES: Performance evaluation of four types of asphalt concrete overlays for deteriorated national highways.
METHODS : Pavement distress surveys for crack rate and rut depth have been conducted annually using an automated pavement survey vehicle since 2007. Linear and non-linear performance prediction models of the asphalt concrete overlays were developed for 43 sections. The service life of the asphalt overlays was defined as the number of years after which a crack rate of 30% or rut depth of 15mm is observed.
RESULTS: The service life of the asphalt overlays was estimated as 17.4 years on an average. In 90.7% of the sections, the service life of the overlays was 15 years or more which is 1.5 times the life of conventional asphalt concrete overlays used in national highways. The performance of the overlays was dependent on the type of asphalt mixture, traffic volume levels, and environmental conditions.
CONCLUSIONS : The usage of stone mastic asphalt (SMA) and polymer-modified asphalt (PMA) for the overlays provided good resistance to cracking and rutting development. It is recommended that appropriate asphalt concrete overlays must be applied depending on the type of existing pavement distress. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001997821 | oai_dc | 구조방정식을 이용한 고령운전자 교통사고 인적 피해 심각도 분석(고양시를 중심으로) | An Analysis of Traffic Accident Injury Severity for Elderly Driver on Goyang-Si using Structural Equation Model | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김솔람(한국건설기술연구원); 윤덕근(한국건설기술연구원)"
] | PURPOSES: The purpose of this study is to verify traffic accident injury severity factors for elderly drivers and the relative relationship of these factors.
METHODS: To verify the complicated relationship among traffic accident injury severity factors, this study employed a structural equation model (SEM). To develop the SEM structure, only the severity of human injuries was considered; moreover, the observed variables were selected through confirmatory factor analysis (CFA). The number of fatalities, serious injuries, moderate injuries, and minor injuries were selected for observed variables of severity. For latent variables, the accident situation, environment, and vehicle and driver factors were respectively defined. Seven observed variables were selected among the latent variables.
RESULTS: This study showed that the vehicle and driver factor was the most influential factor for accident severity among the latent factors.
For the observed variable, the type of vehicle, type of accident, and status of day or night for each latent variable were the most relative observed variables for the accident severity factor. To verify the validity of the SEM, several model fitting methods, including , GFI, AGFI, CFI, and others, were applied, and the model produced meaningful results.
CONCLUSIONS: Based on an analysis of results of traffic accident injury severity for elderly drivers, the vehicle and driver factor was the most influential one for injury severity. Therefore, education tailored to elderly drivers is needed to improve driving behavior of elderly driver. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001921479 | oai_dc | 고속도로 주행속도 변화에 영향을 미치는 도로기하구조 특성분석: 제한속도 상향전후 비교를 중심으로 | Characteristics of Geometric Conditions Affecting Freeway Travel Speed : Focused on Speed Limit Change | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"홍성민(·Hokkaido University, Graduate School of Engineering); 오철(한양대학교)"
] | PURPOSES : The purpose of this study is to identify the factors affecting the effectiveness of speed limit change that is defined as theamount of increased travel speed.
METHODS: A ordered logit model was adopted to analyze the relationship between the change in travel speed and contributing factors. Astretch of Kyungbu freeway was selected for the analysis because the Korea expressway corporation has raised speed limit from 100km/h to110km/h since September 1st in 2010.
RESULTS: The results showed that geometric design elements, speeding cameras, and section length were identified as factors contributingthe effectiveness. Contributing geometric design elements include the number of horizontal curves and vertical curves that do not meet thedesign requirement with 110km/h speed limit.
CONCLUSIONS: The outcome of this study will be used for establishing various traffic operations and control strategies for freeway speedmanagement. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001921481 | oai_dc | 고속버스 통행시간 예측의 정확도 제고를 위한 입력자료분석기간 선정 연구 | Analysis Period of Input Data for Improving the Prediction Accuracy of Express-Bus Travel Times | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"남승태(한국도로공사); 윤일수(아주대학교); 이철기(아주대학교); 오영태(아주대학교); 최윤택(한국도로공사); 권건안(교통안전공단 운영지원처)"
] | PURPOSES : The travel times of expressway buses have been estimated using the travel time data between entrance tollgates and exittollgates, which are produced by the Toll Collections System (TCS). However, the travel time data from TCS has a few critical problems. Forexample, the travel time data include the travel times of trucks as well as those of buses. Therefore, the travel time estimation of expresswaybuses using TCS data may be implicitly and explicitly incorrect. The goal of this study is to improve the accuracy of the expressway bus traveltime estimation using DSRC-based travel time by identifying the appropriate analysis period of input data.
METHODS : All expressway buses are equipped with the Hi-Pass transponders so that the travel times of only expressway buses can beextracted now using DSRC. Thus, this study analyzed the operational characteristics as well as travel time patterns of the expressway busesoperating between Seoul and Dajeon. And then, this study determined the most appropriate analysis period of input data for the expressway bustravel time estimation model in order to improve the accuracy of the model.
RESULTS: As a result of feasibility analysis according to the analysis period, overall MAPE values were found to be similar. However, theMAPE values of the cases using similar volume patterns outperformed other cases.
CONCLUSIONS: The best input period was that of the case which uses the travel time pattern of the days whose total expressway trafficvolumes are similar to that of one day before the day during which the travel times of expressway buses must be estimated. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001921484 | oai_dc | RPNB 모형을 이용한 고속도로 인터체인지 구간에서의 교통사고모형- 인터체인지 형태별/지역별로 | Random Parameter Negative Binomial Models of Interstate Accident Frequencies on Interchange Segment by Interchange Type/Region | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이근희(한국건설기술연구원); 박민호(한국건설기술연구원); 노정현(한양대학교)"
] | PURPOSES : The objective was to develop the advanced method which could not explain each observation’s specific characteristic in thepresent negative binomial method that results in under-estimation of the standard error(t-value inflation) and affects the confidence of wholederived results.
METHODS : This study dealt with traffic accidents occurring within interchange segment on highway main line with RPNB(RandomParameter Negative Binomial) method that enables to take account of heterogeneity.
RESULTS : As a result, AADT and lighting installation type on the road were revealed to have random parameter and in terms of othergeometric variables, all were derived as fixed parameter(same effect on every segment). Also, marginal effects were adapted to analyze therelative effects on traffic accidents.
CONCLUSIONS : This study proves that RPNB method which considers each observation’s specific characteristics is better fitted to theaccident data with geometrics. Thus, it is recommended that RPNB model or other methods which could consider the heterogeneity needs to beadapted in accident analysis. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001921477 | oai_dc | 순열알고리즘을 이용한 도로포장의 유지보수 | Pavement Maintenance System Through using the Permutation Algorithm | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김장락((주)로드텍); 이상염(서울시청); 문성호(서울과학기술대학교)"
] | PURPOSES: This study focuses on conducting pavement rehabilitation for more deteriorated roads given a limited government budget.
METHODS: Therefore, we apply a optimization programming model of the permutation algorithm used for rehabilitating more deterioratedpavement areas, which is subjected to the limited budget.
RESULTS: The permutation algorithm was evaluated in terms of determining the maximized rehabilitation of deteriorated pavement areas,using the newly developed performance models such as fatigue cracking, rutting, international roughness index(IRI) through the surveying datafrom 2006 to 2012. When compared with a traditional model of the so-called worst-first sequence(WFS) method, the permutation algorithmworked better than the WFS method, resulting in covering more deteriorated pavement areas given the limited government budget.
CONCLUSIONS : Through a case study, it could be concluded that the permutation algorithm provides more reliable results in terms ofrehabilitating more deteriorated pavement areas given the limited budget. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001921485 | oai_dc | 순서형 프로빗모형에 의한 이륜차 사고심각도의 영향요인 분석 | Analysis of Factors influencing Severity of Motorcycle Accidents using Ordered Probit Model | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"최정우(명지대학교); 금기정(명지대학교)"
] | PURPOSES : This study drew factors affecting motorcycle accidents in Seoul by severity using an ordered probit model and aimed toanalyze and verify the drawn influence factors.
METHODS: As the severity of the accidents could be classified into three types (fatal injury, serious injury and minor injury), this studydrew the factors affecting accidents by a comparative analysis employing an ordered probit model, removed the variables that would not securesignificance sequentially to construct a model with high explanatory power regarding the factors affecting the severity of motorcycle accidents,and calculated the marginal effect of each factor to understand the degree of each factor’s impact on the severity. First, Model 1 put in allvariables; Model 2 was constructed by removing the variables of the road surface conditions that could not meet the level of significance(p=0.608); Model 3 was constructed by removing gender variable (p=0.423); and Model 4 was constructed finally by removing age variable(p=0.320).
RESULTS : As a result of an analysis, statistically significant variables were time of occurrence, type of accident, road alignment andmotorcycle displacement, and it turned out that the impacts on the severity were in the following order: a road alignment of left downhill, thetype of motorcycle-to-vehicle accidents and a road alignment of a flatland on the left. The significance of the models was tested using thelikelihood ratio, the level of significance and suitability statistics about them, and as a result of the test, the significance level and suitability ofthe constructed models were all excellent. In addition, the model accuracy indicating the accuracy of a predicted value compared to that of thevalue actually observed was 70.3% for minor injury; 70.1% for serious injury; and 68.6% for fatal injury, and the overall accuracy was 70.2%,which was very high.
CONCLUSIONS: As a result of an analysis of motorcycle accidents in Seoul through the ordered probit model and the marginal effect, itturned out that their severity increased in nighttime accidents as compared to daytime ones and gradually increased in the order of motorcycleto-vehicle accidents, motorcycle-to-person ones and the ones involving motorcycle only. As a result of an analysis, the severity of accidents inroad alignments of left downhill, left flatland and straight downhill increased as compared to those in a road alignment of straight flatland andthat the severity of accidents of motorcycles with a displacement larger than 50cc was higher than that of those with a displacement smallerthan 50cc. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001921472 | oai_dc | 3차원 지반재료 모델기반의 다양한 지주형상을 갖는노측용 가드레일의 동적성능 평가 | Dynamic Performance of Guardrail System with Various Post Shapes Based on 3-D Soil Material Model | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이동우(영남대학교); 여용환(영남대학교); 양승호(영남대학교); 우광성(영남대학교)"
] | PURPOSES: This paper evaluates, using LS/DYNA-3D software, the vehicle impact performance of flexible barriers made of steel WBeamsupported by four different types of post configurations. These types include circular post, H-shape post, C-shape post, and squarepost.
METHODS : The post-soil interaction has been investigated according to different impact angles. For this purpose, energy absorption,maximum displacements of post and rail, and occupant risk index of THIV have been compared each other. The three dimensional soil materialmodel, instead of the conventional spring model based on Winkler and p-y curve, has been used to increase the correctness of computationalmodel.
RESULTS: It is noted the crash energy absorption has been increased with respect to the increase of impact angle.
CONCLUSIONS : In particular, a post with open section(H-shape, C-shape) shows the greater crash energy absorption capability ascompared with a post with closed section under the same level of impact conditions. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001921487 | oai_dc | 상습 지체구간 선정을 위한 Percentile 속도의 활용 | Application of Percentile Speed for Appraisal of Road Section with Recurring Congestion | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김형곤(남경 E&C); 이기영(한국도로공사 도로교통기술원); 이숭봉(서울대학교); 장명순(한양대학교)"
] | PURPOSES: The objective of this study is to find Percentile Speed( ) for Appraisal of Road Section with Recurring Congestion.
METHODS : Percentile Speed( ) is determined by correlation analysis of CSI that proposed existing literature. and CSI(ConsistencyService Index) is a index that subtract service fail frequency from 100 points, and service fail is defined as traffic situation is driving less than80kph speed. In this study, We analyzed the highest correlation percentile speed associated with CSI. This speed is chosen as a delay decisionspeed. In order to verifying reliability, it performed a comparison with the previous method.
RESULTS : As a result, 30 percentile speed( ) was decided as index speed for judgement of recurring congestion section, and throughcomparison with existing methods, we demonstrated that 30 percentile speed can be useful for judgement of recurring congestion section.
CONCLUSIONS: This method to Determine recurring congestion section using the percentile speed( ) was proposed for the first time inthis paper. This method can be applicated more quickly and easily than existing method for determining of recurring delay section . | 토목공학 | null | kci_detailed_000163.xml | |||
ART001921483 | oai_dc | 국내 로터리의 회전교차로 전환에 따른 통행비용 분석 | Analysis of Travel Cost According to Transferring from Rotary to Roundabout in Korea | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"임진강(충북대학교); 박병호(충북대학교)"
] | PURPOSES: The goal of this study is to analyze the travel cost according to transferring from rotary to roundabout in Korea.
METHODS: This study gives particular attentions to investigating the existing 48 rotaries in Korea and building the networks of before andafter improvements using VISSIM, and analyzing their travel costs.
RESULTS: The main results are as follows. First, from the field survey, the domestic rotaries were analyzed to need many improvements ofgeometric structure for the effective operation. Second, the difference of travel cost at 3-legged rotaries were evaluated to be less than othertypes of rotaries due to low traffic volume. Finally, the travel cost of 4-legged and multi-legged rotaries were analyzed to rapidly increase byincreasing volume.
CONCLUSIONS: This study analyzes the effects using both real and simulation data unlike the existing studies. Also, this study suggeststhe future research topics which compare and evaluate the relations between real data and simulation outputs. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001921471 | oai_dc | 중질유 고도정제 부산물의 도로포장용 역청재료로서의 적용성 평가 | Evaluation of Applicability of Heavy Oil Upgrading By-Product (Pitch) as A Pavement Paving Material | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"양성린(한국건설기술연구원)"
] | PURPOSES : The objective of this study is to evaluate the applicability of the pitch, which is produced during SDA petroleum upgradingprocess, as a pavement paving material. In order for the purpose, the physical and chemical properties of the pitch are analyzed, and then thevarious plasticizers are applied in the pitch.
METHODS: Two types of pitch are selected from oil refinery companies, which are owned the SDA petroleum upgrading process. Also,two types of asphalt binders, PG 64-22 and PG 58-22, are employed to compare with the pitch because these two types of asphalt binders arecurrently used as paving materials. For the chemical property of the pitch, the composition of SARA (Saturate, Aromatic, Resin, Asphaltene),the elementary composition, and the functional group are analyzed. For the physical property of the pitch, the basic material property tests,such as penetration test, softening point test, flash point test, ductility test, and rotational viscometer test, are performed. Also, the DSR(Dynamic Shear Rheometer) test and the BBR (Bending Beam Rheometer) test are conducted using asphalt binder specimens obtained by bothshort term aging (Rolling Thin Film Oven, RTFO) and long term aging (Pressure Aging Vessel, PAV) processes. The rheological property ofeach pitch type is evaluated as a function of temperatures and loading cycles. PG 64-22 asphalt binder is used as a control material.
RESULTS AND CONCLUSIONS: The Pitch may not be suitable for the pavement paving material without modifications, but the pitchcan be used as alternatives of modified addictive or asphalt. If low molecular component, such as saturate and aromatic components, are addedin the pitch based on the development of various plasticizers, it has a strong possibility for the pitch to be used as a alternative. However, inorder to verify the performance property of the pitch, further research is needed. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001921473 | oai_dc | 강우강도에 따른 아스팔트 혼합물 종류의 수분민감도 평가 | An Evaluation of Moisture Susceptibility on Asphalt Mixtures by Rainfall Intensity | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"정종석(토지주택연구원); 김용락(University of Nebraska); 이상혁(경희대학교); 김효진(토지주택연구원)"
] | PURPOSES: The purpose of this study is to evaluate moisture susceptibility of a dense graded and an open graded asphalt mixtures by themethod of AASHTO T-283.
METHODS: To simulate moisture damage of asphalt pavements with continuously rainfall during summer rainy season, the dense gradedand the open graded asphalt mixtures were immersed in water for 15 days and were measured the weight and the change of strength. Also, themixtures were performed five freeze-thaw cycles to simulate moisture damage of the mixtures by freeze-thaw during winter and were measuredthe change of strength. The degradation characteristics model was used to analyze the relationship between strength and moisture damage.
RESULTS: According to the results, the dense graded and the open graded asphalt mixtures were shown in the similar trends of the strengthchanges by immersion time and freeze-thaw cycle. However, the moisture damage reduction of open graded asphalt mixture was moresensitive in early phase than that of dense graded asphalt mixture. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001921475 | oai_dc | 도로구조물 적용을 위한 광촉매 콘크리트의 질소산화물(NOx) 제거효율 평가 | Evaluation of NOx Removal Efficiency of Photocatalytic Concrete for Road Structure | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김영규(강릉원주대학교); 홍성재(강릉원주대학교 토목공학과); 이경배(한국도로공사); 이승우(강릉원주대학교)"
] | PURPOSES: In areas of high traffic volume, such as expressway across large cities, the amount of nitrogen oxides (NOx) emitted into theatmosphere as air pollution can be significant since NOx gases are the major cause of smog and acid rain. Recently, the importance of NOxremoval has arisen in the world. Titanium dioxide (TiO2), that is one of photocatalytic reaction material, is very efficient for removing NOx.
The NOx removing mechanism of TiO2 is the reaction of solar photocatalysis. Therefore, TiO2 in road structure concrete need to be contactedwith ultraviolet rays (UV) to be activated. In general, TiO2 concretes are produced by replacement of TiO2 as a part of concrete binder.
However, considerable portion of TiO2 in concrete cannot contact with the pollutant in the air and UV. Therefore, TiO2 penetration methodusing the surface penetration agents is attempted as an alternative in order to locate TiO2 to the surface of concrete structure.
METHODS: This study aimed to evaluate the NOx removal efficiency of photocatalytic concrete due to various TiO2 application methodsuch as mix with TiO2, surface spray(TiO2 penetration method) on hardened concrete and fresh concrete using surface penetration agents. TheNOx removal efficiency of TiO2 concrete was confirmed by NOx Analyzing System based on the specification of ISO 22197-1.
RESULTS: The NOx removal efficiency of mix with TiO2 increased from 11 to 25% with increasing of replacement ratio from 3 to 7%. Incase of surface spray on hardened concrete, the NOx removal efficiency was about 50% due to application amount of TiO2 with surfacepenetration agents as 300, 500 and 700g/m2. The NOx removal efficiency of surface spray on fresh concrete due to all experimental conditions,on the other hand, which was very low within 10%.
CONCLUSIONS: It was known that the TiO2 penetration method as surface spray on hardened concrete was a good alternative in order toremove the NOx gases for concrete road structures. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001921476 | oai_dc | 확장형 칼만필터 알고리즘을 활용한 차량 주행에 따른 마찰소음의 총 음압레벨 예측 | Estimation of Total Sound Pressure Level for Friction Noise Regarding a Driving Vehicle using the Extended Kalman Filter Algorithm | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김도완(서울과학기술대학교); 한범수(서울과학기술대학교); 문성호(서울과학기술대학교); 안덕순(한국건설기술연구원)"
] | PURPOSES: This study is to predict the Sound Pressure Level(SPL) obtained from the Noble Close ProXimity(NCPX) method by using theExtended Kalman Filter Algorithm employing the taylor series and Linear Regression Analysis based on the least square method. The objectiveof utilizing EKF Algorithm is to consider stochastically the effect of error because the Regression analysis is not the method for the staticalapproach.
METHODS: For measuring the friction noise between the surface and vehicle’s tire, NCPX method was used. With NCPX method, SPL canbe obtained using the frequency analysis such as Discrete Fourier Transform(DFT), Fast Fourier Transform(FFT) and Constant PercentageBandwidth(CPB) Analysis. In this research, CPB analysis was only conducted for deriving A-weighted SPL from the sound power level interms of frequencies. EKF Algorithm and Regression analysis were performed for estimating the SPL regarding the vehicle velocities.
RESULTS : The study has shown that the results related to the coefficient of determination and RMSE from EKF Algorithm have beenimproved by comparing to Regression analysis.
CONCLUSIONS : The more the vehicle is fast, the more the SPL must be high. But in the results of EKF Algorithm, SPLs are irregular.
The reason of that is the EKF algorithm can be reflected by the error covariance from the measurements. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001921478 | oai_dc | SBR Latex를 이용한 흙 포장의 재료특성 연구 | Study on the Effect of SBR Latex on the Properties of Soil Pavement | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이상염(서울시청); 황성도(한국건설기술연구원); 양성린(한국건설기술연구원)"
] | PURPOSES : The purpose of this study is to determine the optimum addition rate of SBR latex through the evaluation of durability andstrength of SBR latex applied soil pavement. Formerly used materials such as fly ash and cement in soil pavement had resulted in decreaseddurability due to micro crack by heat of hydration and shrinkage crack in winter. However, that agglutinated polymers help adhesion toaggregate increased comes up with preventing the crack opening when the number of capillary tubes of SBR latex get decreased in thehydration process of cement. Therefore, in this study, it is suggested that the evaluation of the field applicability of soil pavement be conductedthrough the performance lab test in terms of strength increment, adhesion improvement, and crack resistance based on SBR latex addition rate.
METHODS: In order to evaluate the field applicability of soil pavement, SBR latex was added 0 to 3% by 1% increment, with fixed cementcontents of 3% and 5%. The resistance of shear failure and crack of soil pavement were evaluated by performing the uniaxial compressivestrength test and indirect tensile strength test at -20 and 20℃, respectively.
RESULTSCONCLUSIONS: It was found out that from both tests, resistance of shear failure and crack were improved with increment ofcuring time, and especially more than 2% of SBR latex addition rate and 5% cement content gave better results. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001921480 | oai_dc | 도로교통안전점검차량을 이용한 도로의 자동도면화 생성 연구 | The Study on an Automated Generation Method of Road Drawings using Road Survey Vehicle | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이준석(공간정보연구원); 윤덕근(한국건설기술연구원); 박재홍(한국건설기술연구원)"
] | PURPOSES : This study is to develop a automate road mapping system using ARASEO(Automated Road Analysis and Safety EvaluationTOol) for road management.
METHODS: The road survey van named ARASEO(Automated Road Analysis and Safety Evaluation TOol) was used to generate highwaydrawings for Korea National Road number 37 automatically. In order to generate the highway drawings for purpose of road management, it isrequired to acquired the information for highway alignment, road width and road facilities such as safety barrier and road sign. Therefore thesurvey van acquired and analyzed the road width, median and guardrail data using rear side laser sensor of ARASEO and recognized the trafficcontrol sign and chevron sign using foreside camera images. Also the highway alignment which is the basic information for highway drawingcan be analyzed by acquisition the every 1m positional and attitude data using GPU and IMU sensor and developed algorithm. Finally, in thisresearch the CAD based drawing software was developed to draw highway drawing using the analysis result from ARASEO.
RESULTS : This study showed the comparison result of the surveyed road width and drawing data. To make the drawing of the road, wemade the Autocad ARX program witch run in CAD menu interface.
CONCLUSIONS : Using this program we can create the road center line, every 500m horizontal and vertical ground plan drawingautomatically. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001921486 | oai_dc | 터널 내 콘크리트포장 표면처리공법 별 탑승자의 주행쾌적성 평가 | Evaluation on Riding comfort of A Passenger with Various Surface Textures of Concrete Pavement in Tunnels | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이경배(한국도로공사); 이재훈(한국도로공사 도로교통기술원); 손덕수(한국도로공사); 권순민(한국도로공사 도로교통기술원)"
] | PURPOSES : The purpose of this article is to compare and evaluate the riding comfort of a passenger in tunnels depending on differentsurface textures of concrete pavement.
METHODS: Evaluation of riding comfort is conducted at 17 sections, which have different surface texture such as transverse tinned(TT),longitudinal tinned(LT) and diamond grinded(DG). A triaxial accelerometer was set up on the passenger seat surface of the test vehicle tomeasure vibrations of an occupant, then the effects of vibration on comfort and health were evaluated by ISO 2631. And microphones wereinstalled at passenger's ears height to measure sound pressure level(SPL) in the test vehicle. Additionally, a surface microphone was installedon the inside of wheel arch to evaluate noise between tire and pavement by NCPX method. All tests were conducted cruising at 100km/h.
RESULTS : The results of all tests are as follows. First, both vibration magnitudes for comfort and for health in LT and DG sections arealmost same and they represent lower than those in TT sections. Second, the average SPL of DG shows the lowest decibels among them. Andthird, it is founded that interior noise is significantly affected by noise between tire and pavement.
CONCLUSIONS : It may be concluded that DG can provide more excellent riding comfort to passenger than LT or TT. Therefore, it isnecessary to consider applying DG to existing pavement surface to improve surface condition when the driving environment especially requiresriding comfort like a long tunnel. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001921488 | oai_dc | 지방부 일반국도 4차로의 화물차 주행속도 예측모형 개발 | A Development of the Operating Speed Estimation Model of Truck on Four-lane Rural Highway | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"박민호(한국건설기술연구원); 이근희(한국건설기술연구원)"
] | PURPOSES : The purpose of the study is to a) explore the operating speed of trucks on rural highways affected by road geometry, andthereby b) develop a predictive model for the operating speed of trucks on rural highways.
METHODS: Considering that most of the existing studies have focused on cars, the current study aimed to predict the operating speed oftrucks by conducting linear regression analysis on the speed data of trucks operating on the linear-curved-linear portions of the road as a singleset.
RESULTS: The operating speed in the plane curve portion increased with the length of the curve, and decreased with a lower vertical gradeand a smaller curve radius. In the straight plane portion, the operating speed increased with a larger curve radius(upstream), and decreased withan increase in the change of the vertical grade, depending on the length of the vertical curve.
CONCLUSIONS: This study developed estimation models of truck for operational speed and evaluated the degree of safety for horizontaland vertical alignments simultaneous. In order to represent whole area of the rural highway. the models should be ew-analyzed with vast datarelated with road alignment factor in the near future | 토목공학 | null | kci_detailed_000163.xml | |||
ART001921482 | oai_dc | 신호교차로 분석도구별 제어지체 산출 성능 비교 연구 | Performance Comparison of Signalized Intersections Analysis Tools in Estimating Control Delays | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"윤일수(아주대학교); 오철(한양대학교); 안현경(아주대학교 건설교통공학과); 김경현(아주대학교); 한음(아주대학교); 강남원(한국도로공사); 윤정은(한국건설기술연구원)"
] | PURPOSES : The control delay in seconds per vehicle is the most important traffic operational index to evaluate the level of service ofsignalized intersections. Thus, it is very critical to calculate accurate control delay because it is used as a basic quantitative evidence for decisionmakings regarding to investments on traffic facilities. The control delay consists of time-in-queue delay, acceleration delay, and decelerationdelay so that it is technically difficult to directly measure it from fields. Thus, diverse analysis tools, including CORSIM, SYNCHRO, T7F,VISTRO, etc. have been utilized so far. However, each analysis tool may use a unique methodology in calculating control delays. Therefore,the estimated values of control delays may be different by the selection of an analysis tool, which has provided difficulties to traffic engineers inmaking solid judgments.
METHODS: This study was initiated to verify the feasibility of diverse analysis tools, including HCM methodology, CORSIM, SYNCHRO,T7F, VISTRO, in calculating control delays by comparing estimated control delays with that measured from a field.
RESULTS : As a result, the selected tools produced quite different values of control delay. In addition, the control delay value estimatedusing a calibrated CORSIM model was closest to that measured from the field.
CONCLUSIONS: First, through the in-depth experiment, it was explicitly verified that the estimated values of control delay may depend onthe selection of an analysis tool. Second, among the diverse tools, the value of control delay estimated using the calibrated microscopic trafficsimulation model was most close to that measured from the field. Conclusively, analysts should take into account the variability of controldelay values according to the selection of a tool in the case of signalized intersection analysis. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001921470 | oai_dc | 아스팔트포장의 표면처리에 사용되는 유화아스팔트의 접착력 특성 평가 | Bond Strength Evaluation of Asphalt Emulsions used in Asphalt Surface Treatments | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"임정혁(한국건설기술연구원); 김영수(North Carolina State University); 양성린(한국건설기술연구원)"
] | PURPOSES : The objective of this study is to evaluate the bond strength of asphalt emulsions including polymer-modified emulsions forchip seals and fog seals using the bitumen bond strength (BBS) test.
METHODS : For the laboratory testing, the Pneumatic Adhesion tensile Testing Instrument(PATTI) device is used to measure the bondstrength between the asphalt emulsion and aggregate substrate based on the AASHTO TP-91. In order to conduct all the tests in controledcondition, all test procedures are performed in the environmental chamber. The CRS-2L and the SBS CRS-2P emulsions are used as a polymermodifiedemulsion, and then unmodified emulsion, the CRS-2, is compared for the evaluation of chip seal performance. For the fog sealperformance evaluation, two types of polymer-modified emulsions and one of unmodified emulsion, the CSS-1H, are employed. For chip sealstudy, the BBS tests are performed at 30, 60, 120, and 240 minutes of curing times with curing and testing temperatures of 15℃, 25℃, and 35℃.
The fog seal tests are conducted at 30, 60, 90, 120, 180 minutes, and 24 hours with curing and testing temperatures of 25℃, 30℃, and 35℃.
RESULTS AND CONCLUSIONS : Overall, chip seal emulsions and fog seal emulsions show the similar bond strength trend. At thesame testing condition, polymer-modified emulsions show better bond strength than unmodified emulsions. Also, there is no significantdifference between polymer-modified emulsions. One of important findings is that the most bond strength reaches their final bond strengthwithin one hour of curing time. Therefore, the early curing time plays a vital role in the performance of chip seals and fog seals. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001921474 | oai_dc | 공항포장용 순환골재의 처리방법별 경제성 분석 | Cost Analysis of Recycled Aggregate Production on Airport Pavement | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김승민(홍익대학교); 이활웅(홍익대학교); 양성철(홍익대학교)"
] | PURPOSES: This study aimed to analyze economic effect of recycled aggregate production on job-site airport pavement.
METHODS: The validation of site recycling for waste concrete as economic efficiency is analyzed through the case study of site recycling atan O airport pavement construction. The break-even point for the cost of site recycling was estimated according to two different waste concreteprocessing methods such as job-site recycling and processing on commission (or plant).
RESULTS: Job-site recycling cost decreases as the use rate of job-site recycled concrete aggregate increases, or the amount of concrete wasteincreases, but transporting distance decreases. It was shown in an O airport case that as the use rate of job-site recycled concrete aggregateexceeds 61.4 %, the job-site recycling cost is cheaper than the processing cost on commission.
CONCLUSIONS : The results of this study can utilize basic data of feasibility for site recycling of waste concrete on airport pavementconstruction. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001960897 | oai_dc | 회전교차로의 접근로 신호최적화를 통한 도입효과 분석 | Measurement of Effectiveness of Signal Optimized Roundabout | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"엄정은(부경대학교); 정희진(부경대학교); 배상훈(부경대학교)"
] | PURPOSES : Although signalized intersections have been considered the best way to control traffic volume in urban areas for several decades, roundabouts are currently being discussed as an alternative way to control traffic volume, especially when traffic is light. Because a roundabout’s efficiency depends on the load geometry as well as the traffic volume, design guidelines for roundabouts are recommended only if the incoming traffic volume is very low. It is rare to substitute a roundabout for an existing signalized intersection in urban areas. This study aims to estimate the benefits from the transformation of an existing signalized intersection into a roundabout in an urban area. When there is a more moderate volume of traffic, roundabouts can be effectively used by optimizing signals located at an approaching roadway.
METHODS : The methodologies of this paper are as follows: First, a signalized intersection was analyzed to determine the traffic characteristics. Second, the signalized intersection was transformed into a roundabout using VISSIM microscopic traffic simulation. Then, we estimated and analyzed the effects and the performance of the roundabout. In addition, we adjusted a method to improve the benefits of the transformation via the optimization of signals located at an approaching road to control the incoming traffic volume.
RESULTS : The results of this research are as follows: The signal-optimized roundabout improved delays compared with the signalized intersection during the morning peak hour, non-peak hour, and evening peak hour by 1.78%, 12.45%, and 12.72%, respectively.
CONCLUSIONS : According to the simulation results of each scenarios, the signal-optimized roundabout had less delay time than the signalized intersection. If optimized signal control algorithms are installed in roundabouts in the future, this will lead to more efficient traffic management. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001960901 | oai_dc | 터널 경계부 휘도수준에 따른 운전자 연령대별 안전수준 비교 | Comparison of Safety Level between Driver’s Ages by Threshold Zone Luminance Level of Vehicular Traffic Tunnel | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"조원범(한국건설기술연구원); 정준화(한국건설기술연구원); 김도경(서울시립대학교); 박원일(과학기술대학교)"
] | PURPOSES : The purpose of this study is to suggest a basis for setting appropriate safety goals specifically related to the threshold zone luminance in a vehicular traffic tunnel. .
METHODS: In the test, drivers were divided into two groups. One group consisted of all drivers (average drivers) group with an age ratio of drivers holding domestic driver's license and driver group by age to produce threshold zone luminance in the tunnel. The threshold zone luminance produced as a result was used to analyze how it affects the safety level of each driver group and provide a basis for setting an appropriate safety criterion that can be used to determine threshold zone luminance. We used test equipment, test conditions, and ananalysis of threshold zone luminance identical to that reported by ChoandJung(2014) but the values of adaptation luminance in our analys is were expanded to range from100 to10,000 cd/m2.
RESULTS : Adaptation luminance and threshold zone luminance are found to be related by a quadratic function. The threshold zone luminance needed by older drivers to ensure a certain safety level is significantly higher than that for drivers of other age brackets when adaptation luminance increases. 56% of older drivers are at an increased risk of an accident at the same luminance for which the safety level of average drivers is 75%. The safety level that can be achieved for older drivers increases to above 60% when threshold zone luminance level is set with the goal of attaining a safety level of more than 85% for average drivers. The safety level that can be attained for average drivers is above 90% when the threshold zone luminance is high enough to ensure over 75% in the safety level of older drivers. Results of this study are applicable to highways and others whose designed speed is 100 km/h.
CONCLUSIONS : Threshold zone luminance determined on the basis of drivers having average visual ability is of limited value as a performance standard for ensuring the safety of older drivers. Hence, safety level for older drivers should be considered separately from safety levels for drivers with an average ability to avoid risk. Upward adjustment of older drivers' safety level in the process of determining appropriate threshold zone luminance in a vehicular traffic tunnel may bring both tangible and intangible benefit as a result of reducing accidents. However, there is an associated dollar cost arising from installing and operating lights. As a result, the economic impact of these trade-offs should also be considered. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001960889 | oai_dc | Remarks on the use of Electric Arc Furnace (EAF) Steel Slag in Asphalt Mixtures for Flexible Pavements | Remarks on the use of Electric Arc Furnace (EAF) Steel Slag in Asphalt Mixtures for Flexible Pavements | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"Augusto Cannone Falchetto(Technical University of Braunschweig); 문기훈((주)삼성물산)"
] | PURPOSES: This paper, presents the results of a laboratory study aimed to verify the suitability of a particular type of Electric Arc Furnace (EAF) steel slag to be recycled in the lithic skeleton of both dense graded and porous asphalt mixtures for flexible pavements.
METHODS : Cyclic creep and stiffness modulus tests were performed to evaluate the mechanical performance of three different asphalt mixtures (dense graded, porous asphalt, and stone mastic) prepared with two types of EAF steel slag. For comparison purposes, the same three mixtures were also designed with conventional aggregates (basalt and limestone).
RESULTS : All the asphalt mixtures prepared with EAF steel slag satisfied the current requirements of the European standards, which support EAF steel slag as a suitable material for flexible pavement construction.
CONCLUSIONS : Based on the experimental work, the use of waste material obtained from steel production (e.g. EAF steel slag) as an alternative in the lithic skeleton of asphalt mixtures can be a satisfactory and reasonable choice that fulfills the “Zero Waste”objective that many iron and steel industries have pursued in the past decades. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001960892 | oai_dc | 다짐밀도 측정장비(Non-nuclear Type)를 사용한 현장 다짐밀도 평가 | Evaluation of Field Compaction Density by Non-nuclear Density Gauge | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김영민(한국건설기술연구원); 임정혁(한국건설기술연구원); 양성린(한국건설기술연구원); 김기현(한국건설기술연구원); 황성도(한국건설기술연구원); 정규동(한국건설기술연구원)"
] | PURPOSES: The objective of this study is to compare the densities of asphalt pavements measured both in the field and in the laboratory, and also to evaluate the applicability of field density measuring equipment, such as the pavement quality indicator (PQI), by using statistical analysis.
METHODS: For the statistical analysis of the density measured from asphalt pavement, student t-tests and a coefficient of correlation are investigated. In order to compare the measured densities, two test sections are prepared, with a base layer and an intermediate layer constructed.
Each test section consists of 9 smaller sections. During construction, the field densities are measured for both layers (base and intermediate) in each section. Core samples are extracted from similar regions in each section, and moved to the laboratory for density measurements. All the measured densities from both the field and laboratory observations are analyzed using the selected statistical analysis methods.
RESULTS AND CONCLUSION : Based on an analysis of measured densities, analysis using a correlation coefficient is found to be more accurate than analysis using a student t-test. The correlation coefficient (R) between the field density and the core density is found to be very low with a confidence interval less than 0.5. This may be the result of inappropriate calibration of the measuring equipment. Additionally, the correlation coefficient for the base layer is higher than for the intermediate layer. Finally, we observe that prior to using the density measuring equipment in the field, a calibration process should be performed to ensure the reliability of measured field densities.. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001960898 | oai_dc | 컴퓨터 기반 실내실험을 통한 고속도로 차선의 적정 규격 | Appropriate Dimension of Freeway Lane Marking using Computer Based Laboratory Experiment | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"강민정(경기대학교); 오흥운(경기대학교)"
] | PURPOSES : It is well known that experts determined the current standard dimensions of freeway lane markings. However, rigorous engineering rationale could be insufficient regarding whether or not the standard dimensions account for how visible the markings are to the driver. In this study, we seek to optimize the dimensions of freeway lane markings to improve their visibility to drivers.
METHODS: The study was conducted as follows. First, alternative lane marking dimensions were selected which could be installed in a test construction site. Second, a video recording was made while driving on the test construction site. Third, subjects were shown the recorded video and then instructed to indicate their preference from among the various lane markings. Lastly, t-tests were applied to assess the statistical significance of differences in the preferences expressed.
RESULTS : According to the t-test results, there was no significant difference in the preferences expressed regarding the lane marking widths. However, with regard to the dimensions of freeway lane marking, which represents line marking lengths, gap lengths, and widths of marking, the subjects expressed a preference for specific dimensions such as 6 m:12 m,13 cm, 8 m:12 m,10 cm and 6 m:12 m,10 cm.
CONCLUSIONS : In considering the dimensions of freeway lane markings and their relation to visibility by the driver, it was found that dimensions such as 6 m:12 m,13 cm, 8 m:12 m,10 cm and 6 m:12 m,10 cm. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001960896 | oai_dc | 연속철근 콘크리트 슬래브 시스템의 균열진전 깊이와 균열폭 거동 관계 분석 | Relationship between Crack Propagation Depth and Crack Width Movement in Continuously Reinforced Concrete Slab Systems | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"조영교(경희대학교); 김성민(경희대학교); 오한진(경희대학교); 최린(경희대학교); 석종환(경희대학교)"
] | PURPOSES: The purpose of this study is to investigate the relationship between the crack propagation depth through a slab and crack width movement in continuously reinforced concrete slab systems (CRCSs).
METHODS : The crack width movements in continuously reinforced concrete pavement (CRCP) and continuously reinforced concrete railway track (CRCT) were measured in the field for different crack spacings. In addition, the crack width movements in both CRCP and CRCT were simulated using finite element models of CRCP and CRCT. The crack width movements, depending on the unit temperature change, were obtained from both the field tests and numerical analysis models..
RESULTS: The experimental analysis results show that the magnitudes of the crack width movements in CRCSs were related to not only the crack spacing, but also the crack propagation depth. In CRCP, the magnitudes of the crack width movements were more closely related to the crack propagation depths. In CRCT, the crack width movements were similar for different cracks since most were through cracks. If the numerical analysis was performed to predict the crack width movements by assuming that the crack propagates completely through the slab depth, the predicted crack width movements were similar to the actual ones in CRCT, but those may be overestimated in CRCP.
CONCLUSIONS: The magnitudes of the crack width movements in CRCSs were mainly affected by the crack propagation depths through the slabs. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001960899 | oai_dc | 간선도로 좌곡선부 전후구간 수막현상 방지를 위한 종 횡단경사 조합 적용방안 | A Method of Compounding Application of Longitudinal Grade and Superelevation on Left Curved Section in Arterial for Preventing Hydroplaning | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"정지환(경기대학교); 오흥운(경기대학교)"
] | PURPOSES : This study aims to evaluate the road safety of the super-elevation transition section of a left turn curve and suggest the minimum longitudinal grade of a super-elevation transition section to be used before and after a left curved section.
METHODS: We evaluated the road condition by means of the safety-criterion-evaluation method involving side friction factors, and then solve the problem by introducing the minimum longitudinal grade criterion based on conditions described in the hydraulics literature.
RESULTS : It was calculated that when a road satisfies hydroplaning conditions, the difference between side friction assumed and side friction demanded is less than - 0.04. In this case, the safety criterion for the condition is unsatisfied. Conversely, when a road is in a normal state under either wet or dry conditions, it was calculated that the difference between side friction assumed and side friction demanded is more than 0.01. Thus, the safety criterion for this condition is found to be satisfied. After adjusting the minimum longitudinal grade applied to a super-elevation transition section, the hydroplaning condition can be eliminated and the safety criterion can be met for all sections.
CONCLUSIONS : It is suggested that a minimum longitudinal grade should be provided on super-elevation transition sections in order to prevent hydroplaning. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001960891 | oai_dc | 폴리우레탄 개질 아스팔트 바인더를 사용한 포트홀응급 보수재의 성능평가 | Evaluation of Emergency Pothole Repair Materials using Polyurethane-Modified Asphalt Binder | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김영민(한국건설기술연구원); 임정혁(한국건설기술연구원); 황성도(한국건설기술연구원)"
] | PURPOSES : The objective of this study is to develop new pothole repair materials using polyurethane-modified asphalt binder, and to evaluate them relative to current pothole repair materials in order to improve the performance of repaired asphalt pavement.
METHODS : In the laboratory, polyurethane-modified asphalt binder is developed, and then asphalt binder is added to produce pothole repair materials. In order to evaluate the properties of this new pothole repair material, both an indirect tension strength test and a direct tension strength test are performed to measure the material strength and bond strength, respectively. Additionally, the basic material properties are evaluated using the asphalt cold mix manual. The strength characteristics based on curing times are evaluated using a total of 7 types of materials (3 types of current materials, 2 types of new materials, and 2 types of moisture conditioned new materials). The indirect tension strength tests are conducted at 1, 2, 4, 8, 16, and 32 days of curing time. The bond strength between current HMA(Hot Mix Asphalt) and the new materials is evaluated by the direct tension strength test.
RESULTS AND CONCLUSIONS : Overall, the new materials show better properties than current materials. Based on the test results, the new materials demonstrate less susceptibility to moisture, faster curing times, and an improved bond strength between HMA and the new materials.
Therefore, the use of the new materials reported in this study may lead to enhanced performance of repairs made to asphalt pavement potholes. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001960893 | oai_dc | 화상분석법을 이용한 하이브리드 콘크리트의 공극구조 특성 및투수성 평가 | Estimation of Pore Structure Characteristic and Permeability of Hybrid Concrete by Image Analysis Method | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"장봉진((주)삼우아이엠씨); 전범준((주)삼우아이엠씨); 홍영호((주)삼우아이엠씨); 배종오((주)삼우아이엠씨); 임홍범(강원대학교)"
] | PURPOSES : In this study, an image analysis method is used to evaluate the pore structure characteristics and permeability of hybrid concrete.
METHODS: The binder weight of hybrid concrete is set to 400 kg/m3, 370kg/m3, and 350 kg/m3, and for each value of binder weight, the pore structure and permeability of concrete mixture is evaluated. The permeability of hybrid concrete is evaluated using a rapid chloride penetration test(RCPT).
RESULTS : The concrete pore structure characteristics of hybrid concrete reveals that as the binder weight is reduced, the entrained air is reduced and the entrapped air is increased. The permeability of the hybrid concrete for all values was measured to be below 1000 C, which indicates a "Very Low" level of permeability relative to the evaluation standard of KS F 2711. Additionally, as the binder weight is decreased, there is a significant increase in the permeability of chloride ions.
CONCLUSIONS : In this study, the pore structure characteristics of hybrid concrete at different binder weights shows that as the binder weight is reduced, the entrained air is reduced and the entrapped air is increased. Consequently, chloride ion penetration resistance of the hybrid concrete is diminished. As a result, it is expected that this will reduce the concrete’s durability. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001960886 | oai_dc | 아스팔트 노면조직의 파장길이가 타이어-노면소음에 미치는 영향 | The Effect of Texture Wavelength on the Tire-Pavement Noise in Asphalt Concrete Pavement | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"홍성재(강릉원주대학교); 박성욱(강릉원주대학교); 이승우(강릉원주대학교)"
] | PURPOSES : Recently, attempts have been made to evaluate tire-pavement noise based on a measure of Mean Profile Depth (MPD).
However, equivalent values of MPD appear to correspond to different levels of tire-pavement noise, which indicates that other factors such as texture wavelength need to be included to improve the accuracy of noise prediction. A single index to represent texture wavelength is proposed in this study. A consistent relationship between tire-pavement noise and texture wavelength on asphalt concrete pavement is observed.
METHODS: Profile data and tire-pavement noise data were collected from a number of expressway sections in Korea. In addition, texture wavelength was defined by a Peak Number (PN), which was calculated using profile data. Statistical analysis was performed to find the relationship between the PN and tire-pavement noise.
RESULTS: As a result of this study, a linear relationship between PN and tire-pavement noise is observed on asphalt concrete pavement.
CONCLUSIONS: Tire-pavement noise on asphalt concrete pavement can be predicted from PN information. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001960895 | oai_dc | 보일링 시험을 통한 아스팔트 혼합물의 수분민감성 평가 | Evaluation of Moisture Susceptibility of Asphalt Mixtures Using Boiling Water Test | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김준(군산대학교); 박대욱(군산대학교); 보비에트하이(군산대학교); 김혁중(금호석유화학); 박준상(금호석유화학)"
] | PURPOSES : The purpose of this paper is to evaluate the moisture susceptibility of asphalt mixtures containing developed liquid antistripping agents using the boiling water test as a screening test.
METHODS: The boiling water test was used to evaluate the moisture susceptibility of asphalt mixtures containing different anti-stripping agents. The tensile strength ratio was calculated to compare the moisture susceptibility of the asphalt mixtures after indirect strength tests were performed. Additionally, image analysis techniques were used to calculate and analyze the quantity of stripped area in the asphalt mixtures.
RESULTS: In general, the asphalt mixtures containing anti-stripping agents showed a higher resistance of anti-stripping based on the boiling water test and tensile strength ratio.
CONCLUSIONS: The boiling water test can be used to differentiate the resistance of moisture susceptibility of asphalt mixtures, except for asphalt mixtures containing hydrated lime. The boiling water test can be used as a screening test for asphalt mixtures before conducting time consuming and expensive indirect tensile strength tests. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001960894 | oai_dc | 지오그리드로 보강된 투수성 연성포장 보조기층제 영구변형을 고려한 층두께 산정 비교 연구 | Evaluation of Geogrid-Reinforced Subbase Layer Thickness of Permeable Flexible Pavements based on Permanent Deformation Model | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"권혁민(한국교통대학교); 오정호(한국교통대학교); 한신인(서영엔지니어링)"
] | PURPOSES : The objective of this study is to evaluate the effectiveness of a geogrid reinforced subbase of permeable flexible pavement structures with respect to permanent deformation.
METHODS : Experimental trials employing a repeated triaxial load test scheme were conducted for both a geogrid reinforced subbase material and a control specimen to obtain the permanent deformation properties based on the VESYS model. Along with this, a finite elementbased numerical analysis was conducted to predict pavement performance with respect to the rutting model incorporated into the analysis.
RESULTSAND CONCLUSIONS: The results of the experimental study reveal that the geogrid reinforcement seems to be effective in mitigating permanent deformation of the subbase material. The permanent deformation was mostly achieved in the early stages of loading and then rapidly reached equilibrium as the number of load applications increased. The ultimate permanent deformation due to the geogrid reinforcement was about 1.5 times less than that of the control specimen. Numerical analysis showed that the permeable, flexible pavement structure with the geogrid reinforced subbase also exhibits less development of rutting throughout the service life. This reduction in rutting led to a 20% decrease in thickness of the subbase layer, which might be beneficial to reduce construction costs unless the structural adequacy is not ensured. In the near future, further verification must be conducted, both experimentally and numerically, to support these findings. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001960900 | oai_dc | 신호교차로 안전성향상을 위한 단속카메라의 효과분석 연구 - 측면직각 충돌사고를 중심으로 - | Effect Analysis on Red Light Camera for Signalized Intersection Safety -Focused on Side Right-Angle Collision Accidents- | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"오주택(한국교통대학교); 김용석(도로교통공단); 이용철(한국교통대학교)"
] | PURPOSES : Before-and-after studies of red light cameras were conducted with the aim of reducing the number of side right-angle collisions. Three different methods were used for the before-and-after studies, and the analysis results were compared.
METHODS: This research used the naive before-and-after method, the comparison-group method, and the empirical Bayes method to study the effects of red light cameras on side-angle collisions. The results of the three before-and-after methods were compared and interpreted in terms of safety indications at signalized intersections.
RESULTS: The research results showed that side right-angle collisions can be reduced by installing red light cameras at signalized intersections.
All three methods guarantee safety improvements of 25~30% on average. With regard to the results of each method, the naive before-and-after method, the comparison-group method, and the empirical Bayes method showed safety improvements of 25.6%, 27.8%, and 29.7%, respectively.
CONCLUSIONS: It was concluded that red light cameras are an effective countermeasure to improve intersection safety. In particular, by installing red light cameras, side right-angle collisions can be reduced by up to approximately 25~30%. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001960890 | oai_dc | 교통량 및 제설제 사용량에 따른 고속도로 포장의 공용수명 분석 | A Study to Analyze Service Life of Expressway Pavement according to Traffic Volumes and De-icing Chemicals | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김찬우(한국도로공사); 안수한(한국도로공사); 박희영(로드코리아); 이정훈(로드코리아); 정철기(로드코리아)"
] | PURPOSES: The purpose of this study is to analyze the service life of expressway pavement based on both traffic volumes and use of deicing chemicals.
METHODS: A database was built using expressway rehabilitation history information from over the last decade. In order to estimate the service life of expressway pavement, various analysis methods were considered, and a decision was made to perform analysis using a method based on an accumulated rehabilitation ratio. The service life of expressway pavement was then analyzed by classifying the scale of traffic volume and extent of de-icing chemicals used.
RESULTS: The service life of PMA and SMA ranged from 7.8 to 10.6 years and from 9.9 to 12.0 years, respectively. The service life of JCP ranged from 16.0 to 22.2 years, and the service life of CRCP was 33.5 years on average. Results of assessing service life according to traffic volumes and de-icing chemicals showed that the lower the traffic volumes were, the greater the service life of PMA and JCP, and the less that de-icing chemicals were applied, the greater the service life of JCP.
CONCLUSIONS : The dependence of expressway pavement service life on traffic volumes and de-icing chemicals makes it possible to apply LCCA for regional maintenance plans and cost-effective selection of expressway pavement type. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001960888 | oai_dc | 일반국도에 적용한 마이크로서페이싱공법과 폴리머슬러리실공법에 대한 현장 공용성 평가 | Field Performance Evaluation of Micro-surfacing Method and Polymer Slurry Seal Method Used in National Highway | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"손현장(한국건설기술연구원); 김용주(한국건설기술연구원); 백종은(한국건설기술연구원); 임재규(한국건설기술연구원); 김부일(한국건설기술연구원)"
] | PURPOSES: Recently, crack, rutting, and stripping problems from the surface of asphalt pavements in National highway are observed and they affect the drivers to feel uncomfortable on the road. Surface treatments are recommended to use in distressed pavements due to costeffective, and improvement of surface performance. The purpose of this study is to evaluate the performance of micro-surfacing and polymer slurry seal treatments for distressed asphalt pavements.
METHODS: Surface conditions and friction resistance are evaluated for asphalt pavements treated with micro-surfacing and polymer slurry seal mixes in National highway 30 line and 34 line. Visual observation is conducted and surface performance is measured by PES (Performance Evaluation Surveyor) in terms of crack ratio, rutting and IRI(International Roughness Index). BPN(British Pendulum Number) is measured by BPT(British Pendulum Tester) to evaluate the friction resistance in the field.
RESULTS: The surface evaluation results are presented for asphalt pavement treated with micro-surfacing and polymer slurry seal treatments in National highway 30 line and 34 line. Based on the visual observation, micro-surfacing and polymer slurry seal treatments show better improvements in terms of cracks and stripping. Based on the surface conditions measured by PES vehicle, the surface performance of microsurfacing treatments improves from 53.3% to 54.2% and the surface performance of polymer slurry seal treatments improves from 21.6% to 59.7%. However, the friction resistance of both micro-surfacing and polymer slurry seal treatments decreases from 2.5% to 6.7%. Further, it should be verified to produce the surface exposed with aggregates during the construction process of both treatment methods in the field.
CONCLUSIONS : Based on the performance evaluation results in the filed, the surface performance of asphalt pavement treated with micro-surfacing and polymer slurry seal treatments improves from 21.6% to 59.7%. While, the friction resistance of asphalt pavement treated with micro-surfacing and polymer slurry seal treatments does not improve. It can be concluded that current micro-surfacing and polymer slurry seal treatments would improve surface performance but would not improve the friction resistance. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001960887 | oai_dc | 재생골재를 함유한 콘크리트의 열팽창계수 측정 | Measurement for Coefficient of Thermal Expansion of Concretes Made with Recycled Concrete Aggregates | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"양성철(홍익대학교); 이활웅(홍익대학교); 김남호(한국기술교육대학교)"
] | PURPOSES : This study was performed to determine a systematic approach for measuring the coefficient of thermal expansion (COTE) of concrete specimens. This approach includes the initial calibration of measurement equipment. Test variables include coarse aggregate types such as natural aggregate, job-site produced recycled concrete aggregate, and recycled aggregate processed from an intermediate waste treatment company.
METHODS: First, two cylindrical SUS-304 specimens with a known COTE value of 17.3×10-6m/m/℃. were used as reference specimens for the calibration of each measurement system. The well-known AASHTO TP-60 COTE apparatus for concrete measurement was utilized in this study. Four different measurement apparatuses were used with each LVDT installed and a calibration value was determined using each measurement apparatus.
RESULTS : In the initial experimental stage, calibration values for each measurement apparatus were assumed to be almost identical. However, using the SUS-304 samples as a reference, the calibration values for the four different measurement apparatuses were found to range from 3.49 to 8.86 ×10-6m/m/℃. Using different adjusted values for each measurement apparatuses, COTE values for the three different concrete specimens were obtained. The COTE value of concrete made with natural coarse aggregate was 9.91×10-6m/m/℃, that of job-site produced recycled coarse aggregate was 10.45×10-6m/m/℃, and that of recycled aggregate processed from the intermediate waste treatment company was 10.82×10-6m/m/℃.
CONCLUSIONS: We observed that the COTE value of concrete made from recycled concrete aggregates (RCA) was higher than that of concrete made from natural coarse aggregate. This difference is due to the fact that the total volumetric mortar proportion in the RCA mix is higher than that in the concrete mix made with natural coarse aggregate. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001882015 | oai_dc | 도시계획에 따른 개발밀도에 근거한 도시 대기오염 확산분석- 네덜란드 Delft시를 사례로 - | Emission Dispersion Analysis based on the Development Density associated with Urban Planning (a case study of the Delft city on Netherlands) | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김인수(한국건설기술연구원); 양충헌(한국건설기술연구원); 허혜정(한국건설기술연구원); 성정곤(한국건설기술연구원)"
] | PURPOSES : This study presents a specific methodology for air dispersion analysis of urban areas methodology in accordance with urbanplanning and transport policy.
METHODS: This study performed three alternatives including development density and public transit applying integrated urban model forthe Delft city on Netherlands. Based on this result, the two types of air pollutant emissions(PM10, NOx) were calculated and analyzed theemission dispersion on that City.
RESULTS: As a result, the quality of air near the City is better than that of current conditions showed that approximately from 2.1 to 7.9%according to alternatives.
CONCLUSIONS: Air quality assessment in urban areas can be reasonably performed by applying a methodology when urban developmentand transport policy are considered. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001882016 | oai_dc | 비파괴충격파 시험법을 이용한 동탄성계수 평가 | Evaluation of the Dynamic Modulus by using the Impact Resonance Testing Method | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김도완(서울과학기술대학교); 장병관(서울과학기술대학교); 문성호(서울과학기술대학교)"
] | PURPOSES: The dynamic modulus for a specimen can be determined by using either the non-destructed or destructed testing method. TheImpact Resonance Testing (IRT) is the one of the non-destructed testing methods. The MTS has proved the source credibility and has thedisadvantages which indicate the expensive equipment to operate and need a lot of manpower to manufacture the specimens because of the lowrepeatability with an experiment. To overcome these shortcomings from MTS, the objective of this paper is to compare the dynamic modulusobtained from IRT with MTS result and prove the source credibility.
METHODS: The dynamic modulus obtained from IRT could be determined by using the Resonance Frequency (RF) from the FrequencyResponse Function (FRF) that derived from the Fourier Transform based on the Frequency Analysis of the Digital Signal Processing (DSP)(S.
O. Oyadigi; 1985). The RF values are verified from the Coherence Function (CF). To estimate the error, the Root Mean Squared Error (RMSE)method could be used.
RESULTS : The dynamic modulus data obtained from IRT have the maximum error of 8%, and RMSE of 2,000MPa compared to thedynamic modulus measured by the Dynamic Modulus Testing (DMT) of MTS testing machine..
CONCLUSIONS: The IRT testing method needs the prediction model of the dynamic modulus for a Linear Visco-Elastic (LVE) specimento improve the suitability. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001882019 | oai_dc | 서울시 폭설위험도 평가방안 | Suggestion of Heavy Snow Risk Analysis in Seoul | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이석민(서울연구원); 배윤신(서울연구원 안전환경연구실 부연구위원); 박지혜(서울연구원)"
] | PURPOSES: This study is to suggest heavy snow risk analysis in Seoul.
METHODS: Recently, the increase of extreme weather caused by global warming raises the occurrences of unpredictable natural disastersand the loss potential of human disasters by land use facilities accumulation. It is necessary to develop the risk analysis for the natural andhuman disasters.
RESULTS : In this study, heavy snow risk analysis among natural disasters in Seoul was suggested. The spatial unit of risk analysis levelwas established for the lines and administrative districts.
CONCLUSIONS : The risk analysis was performed using risk matrix of disaster occurrence score and disaster damage score. Thecomponents affecting the risk disaster analysis by types were analyzed and the application of heavy snow risk analysis was suggested. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001882013 | oai_dc | 도로구조물 경량화를 위한 복합재료 샌드위치 패널에 관한 연구 | The Advanced Composite Sandwich Panels for Light Weight of Road Structures | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"한봉구(서울과학기술대학교)"
] | PURPOSES: The purpose of this paper is to demonstrate to the practicing engineers, how to apply the advanced composite materials theoryto the road structures. For general construction material used, there is certain theoretical limit in sizes. For super road structure construction, thereduction in panel weight is the first step to take in order to break such size limits.
METHODS: For a typical road structures panel, both concrete and advanced composite sandwich panels are considered. The concrete panelis treated as a special orthotropic plate.
RESULTS: All types of advanced composite sandwich panels are considered as a self-weights less than one tenth of that of concrete panel.
The concrete panel is treated as a special orthotropic plate to obtain more accurate result.
CONCLUSIONS: Advanced composite sandwich panels are considered as a self-weights less than one tenth (10%) of that of concrete panel,with deflections less than that of the concrete panel. This conclusion gives good guide line for design of the light weight of road structures. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001882017 | oai_dc | 충격공진실험과 만능재료시험기에 의한 아스팔트 공시체의동탄성계수 예측 모델 개발 | Development of the Predicted Model for the HMA Dynamic Modulus by using the Impact Resonance Testing and Universal Testing Machine | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김도완(서울과학기술대학교); 김동호(서울과학기술대학교); 문성호(서울과학기술대학교)"
] | PURPOSES: The dynamic modulus can be determined by applying the various theories from the Impact Resonance Testing(IRT) Method.
The objective of this paper is to determine the best theory to produce the dynamic modulus that has the lowest error as the dynamic modulusdata obtained from these theories(Complex Wave equation Resonance Method related to either the transmissibility loss or not, DynamicStiffness Resonance Method) compared to the results for dynamic modulus determined by using the Universal Testing Machine. The ultimateobject is to develop the predictive model for the dynamic modulus of a Linear Visco-Elastic specimen by using the Complex Wave equationResonance Method(CWRM) came up for an existing study(S. O. Oyadiji; 1985) and the Optimization.
METHODS: At the destructive test which uses the Universal Testing Machine, the dynamic modulus results along with the frequency can beused for determining the sigmoidal master curve function related to the reduced frequency by applying Time-Temperature SuperpositionPrinciple.
RESULTS: The constant to be solved from Eq. (11) is a value of 14.13. The reduced dynamic modulus obtained from the IRT consideringthe loss factor related to the impact transmissibility has RMSE of 367.7MPa, MPE of 3.7%. When the predictive dynamic modulus model wasapplied to determine the master curve, the predictive model has RMSE of 583.5MPa, MPE of 3.5% compared to the destructive test results forthe dynamic modulus.
CONCLUSIONS: Because we considered that the results obtained from the destructive test had the most highest source credibility in thisstudy, the dynamic modulus data obtained respectively from DSRM, CWRM were compared to the results obtained from the destructive testby using th IRT. At the result, the reduced dynamic modulus derived from DSRM has the most lowest error. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001882022 | oai_dc | 터널 순응휘도와 경계부 휘도의 관계 연구 | Relationship between Adaptation Luminance and Threshold Zone Luminance for Vehicular Traffic Tunnels | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"조원범(한국건설기술연구원); 정준화(한국건설기술연구원)"
] | PURPOSES : This study has been performed with the objective to determine threshold zone luminance of adaptation luminance by targetsafety level in a vehicular traffic tunnel with design speed set at 100km/h .
METHODS: The study made a miniature capable of portraying changes in luminance distribution within 2×10。conical field of view of thedriver approaching to the tunnel for the test. Test conditions were set based on justifications for CIE 88-1990's threshold zone luminance usedas a reference by domestic tunnel light standards (KS C 3703 : 2010). Luminance contrast of object background and object is 23%, objectpresentation duration is 0.5 seconds, and size of the object background is 7.3×11.5m2RESULTS: Threshold zone luminance was set within adaptation luminance of 100~3,000cd/m2. Adaptation luminance and threshold zoneluminance based on 50%, 75% and 90% target safety level all showed a relatively high linear relationship. According to findings in the study, itis not appropriate to specify the relationship between adaptation luminance and threshold zone luminance as luminance ratio. Rather, directutilization of the linear relationship gained from the study findings appears to be the better solution.
CONCLUSIONS : Findings of this study may be used to determine operation of threshold zone luminance based on target safety level.
However, a proper verification and validity of test results are required. Furthermore, a study to determine proper threshold zone luminance levelconsidering target safety level reviewed in this study and various decision-making factors such as economic conditions in Korea and energyrelatedpolicies should be carried out in addition. Additional tests on adaptation luminance greater than 3,000cd/m2 will be performed, throughwhich application scope of the test findings will be broadened. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001882021 | oai_dc | 회전교통량 분산식 임계 교차로의 운영 및 환경 효과 분석 | Evaluating the Effectiveness of Unconventional Intersections on Operation and Environment | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"문재필(한국건설기술연구원); 김회룡(국토교통부); 이석기(); 정준화(한국건설기술연구원)"
] | PURPOSES : Traffic congestions which occur in the intersections of arterials lead to mobility and environment problem, and then trafficagencies and engineers have been struggling for mitigating congestions with greenhouse gas emissions. As an alternative of solving thesesproblems, this study is to introduce a low-cost and high-effectiveness countermeasure as unconventional intersections which are successfully inoperation in U.S.. The main feature of unconventional intersections is to reroute turning movement on an approach to other approach, whichconsequently more green time is available for the progression of through traffic. Due to improved progression, this unique geometric designcontributes to reduce delays with greenhouse gas emission and provides a viable alternative to interchanges. This study is to evaluate thepotential operation and environment benefits of unconventional intersections.
METHODS: This study used the VISSIM model with Synchro and EnViVer. Synchro is to optimize signal phases and EnViVer model toestimate the amount of greenhouse gas emissions by each condition.
RESULTS : The result shows that unconventional intersections lead to increase the capacity and to reduce greenhouse gas emissions,compared to existing intersections.
CONCLUSIONS: Unconventional intersections have the ability to positively impact operations and environments as a low-cost and higheffectivenesscountermeasure | 토목공학 | null | kci_detailed_000163.xml | |||
ART001882023 | oai_dc | 토빗모형을 이용한 가로구간 보행자 사고모형 개발 | Developing the Pedestrian Accident Models Using Tobit Model | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이승주(충북대학교); 김윤환(충청북도청); 박병호(충북대학교)"
] | PURPOSES: This study deals with the pedestrian accidents in case of Cheongju. The goals are to develop the pedestrian accident model.
METHODS: To analyze the accident, count data models, truncated count data models and Tobit regression models are utilized in this study.
The dependent variable is the number of accident. Independent variables are traffic volume, intersection geometric structure and thetransportation facility.
RESULTS : The main results are as follows. First, Tobit model was judged to be more appropriate model than other models. Also, thesemodels were analyzed to be statistically significant. Second, such the main variables related to accidents as traffic volume, pedestrian volume,number of Entry/exit, number of crosswalk and bus stop were adopted in the above model.
CONCLUSIONS: The optimal model for pedestrian accidents is evaluated to be Tobit model. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001882014 | oai_dc | 줄눈형식에 따른 공항 콘크리트 포장 하중전달율 비교 | Comparison with Load Transfer Efficiency for Joint Types in Airport Concrete Pavements | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"안지환(한국건설기술연구원); 전성일(한국건설기술연구원); 권수안(한국건설기술연구원); 김민우(인천국제공항공사)"
] | PURPOSES: This study is to compare load transfer efficiency of key joint and dowel joint for airport concrete pavement.
METHODS: As AC150/5320-6D of FAA’s [Advisory Circular] was changed into AC150/5320-6E, Key joint type of rigid pavement wereexcluded from Construction Joints.. LTE(Load Transfer Efficiency) of dowel joint and key joint were compared by times and seasons throughpavement temperature measurement, ocular investigation and HWD measurement.
RESULTS: For the joint performance grade of No. 2(The second) runway of airport, 12% of poor rate was observed in key joint and 2% ofpoor rate in dowel joint. Poor rate of key joint was increased to 17%, if only No. 3~No. 6 slabs, which are mostly loaded from the airplanes,were applied for the study. In apron area, LTE poor rate of key joint was high in winter, and LTE poor rate of dowel joint was at least above‘Fair’ grade. In summer, ‘Fair’ for key joint, ‘Acceptable’ for dowel joint appeared.
CONCLUSIONS : As results, dowel joint was superior than key joint for LTE. Deviations of seasons and times were smaller in doweljoint’s result. And LTE in winter was lower than LTE in summer. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001882024 | oai_dc | 교통용량 개정에 따른 고속도로 공사구간의 서비스 수준에 대한 연구 | A Study on Level-of-Service Changes of Expressway in Accordance with the Revision of Traffic Capacity at Work-Zone | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"류성우(한국도로공사 도로교통연구원); 박권제(한국도로공사); 한승환(한국도로공사 도로교통연구원); 조윤호(중앙대학교)"
] | PURPOSES: This study analyzes the available working time at work-zone on the Expressway in accordance to the new capacity manual.
METHODS: Sensitivity analysis on variables were conducted to calculate the adjusted capacity at work-zone based on previous researches.
RESULTS : The main factors which affect available working time at the work-zone were its capacity, number of lanes, terrain and lanewidth. Other factors have minimal effect on the available working time. Based on the analysis, a calendar of lane closures was suggested.
CONCLUSIONS : A series of studies concluded that the capacity at work-zone in the new capacity manual reduced to 76-82% of theexisting manual. As such, the available working time decreased. Furthermore, the factors affecting the available working time needs to beconsidered when making a plan to rehabilitate the distressed pavement. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001882025 | oai_dc | 하이패스 DSRC 기반의 경로통행시간 산정을 위한 공간적 집계방안 산정에 관한 연구 | A Study on Spatial Aggregation Method for Path Travel Time Estimation using Hi-Pass DSRC System | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이환필(한국도로공사 도로교통연구원); 심상우(아주대학교); 최윤택(한국도로공사); 김동인(한국도로공사)"
] | PURPOSES: This investigational survey is to observe a proper spatial aggregation method for path travel time estimation using the hi-passDSRC system.
METHODS: The links which connect the nodes of section detectors location are used for path travel time estimation traditionally. It makessome problem such as increasing accumulation errors and processing times. In this background, the new links composition methods for spatialaggregation are considered by using some types of nodes as IC, JC, RSE combination. Path travel times estimated by new aggregation methodsare compared with PBM travel times by MAE, MAPE and statistical hypothesis tests.
RESULTS : The results of minimum sample size and missing rate for 5 minutes aggregation interval are satisfied except for JC link pathtravel time in Seoul TG~Kuemho JC. Thus, it was additionally observed for minimum sample size satisfaction. In 15, 30 minutes and 1 houraggregation intervals, all conditions are satisfied by the minimum sample size criteria. For accuracy test and statistical hypothesis test, it hasbeen proved that RSE, Conzone, IC, JC links have equivalent errors and statistical characteristics.
CONCLUSIONS : There are some errors between the PBM and the LBM methods that come from dropping vehicles by rest areas.
Consequently, this survey result means each of links compositions are available for the estimation of path travel time when PBM vehicles are missed. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001882020 | oai_dc | 서울시 도로의 폭설대응방안 연구：서초 1동을 중심으로 | A Study on Countermeasures Against Heavy Snow on Road in Seoul : Focusing on Seocho 1-dong | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"원종석(서울연구원); 배윤신(서울연구원 안전환경연구실 부연구위원); 김상균(서울연구원)"
] | PURPOSES: This study is to investigate the countermeasures against heavy snow on road in Seoul: Focusing on Seocho 1-dong.
METHODS : Since 2000, three cases of the top 10 in the highest snow fall depth in a day occurred in 2001(234mm, 156mm) and2010(258mm) and the possibility of heavy snow is getting higher. 10 days after heavy snow fall when the snow thaws, socio-economicdamages occurred often. For example, the insufficient snow removing, difficulty in patients transfer, crash accidents, injuries from a fall, theincreasing cost of snow removing etc.
RESULTS : For the effective deploying snow removing equipment and workers, it is necessary to understand emergency snow removingspots. Seocho 1-dong was tested because it contains mountains, hill and urban areas as well as various buildings and road types exposures.
CONCLUSIONS : Based on the domestic and international heavy snow researches, the elements for vulnerability were analyzed andvulnerable areas to snow fall were derived. | 토목공학 | null | kci_detailed_000163.xml | |||
ART001882018 | oai_dc | 터널내 환경을 고려한 콘크리트 포장의 양생제 살포기준 연구 | A Study of Spraying Curing Compound for Concrete Pavement Considering Environmental Condition in Tunnel | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"류성우(한국도로공사 도로교통연구원); 권오선(한국도로공사 도로교통연구원); 송거름수(중앙대학교); 이민경(한국도로공사 도로교통연구원); 조윤호(중앙대학교)"
] | PURPOSES: The dynamic modulus can be determined by applying the various theories from the Impact Resonance Testing(IRT) Method.
The objective of this paper is to determine the best theory to produce the dynamic modulus that has the lowest error as the dynamic modulusdata obtained from these theories(Complex Wave equation Resonance Method related to either the transmissibility loss or not, DynamicStiffness Resonance Method) compared to the results for dynamic modulus determined by using the Universal Testing Machine. The ultimateobject is to develop the predictive model for the dynamic modulus of a Linear Visco-Elastic specimen by using the Complex Wave equationResonance Method(CWRM) came up for an existing study(S. O. Oyadiji; 1985) and the Optimization.
METHODS: At the destructive test which uses the Universal Testing Machine, the dynamic modulus results along with the frequency can beused for determining the sigmoidal master curve function related to the reduced frequency by applying Time-Temperature SuperpositionPrinciple.
RESULTS: The constant to be solved from Eq. (11) is a value of 14.13. The reduced dynamic modulus obtained from the IRT consideringthe loss factor related to the impact transmissibility has RMSE of 367.7MPa, MPE of 3.7%. When the predictive dynamic modulus model wasapplied to determine the master curve, the predictive model has RMSE of 583.5MPa, MPE of 3.5% compared to the destructive test results forthe dynamic modulus.
CONCLUSIONS: Because we considered that the results obtained from the destructive test had the most highest source credibility in thisstudy, the dynamic modulus data obtained respectively from DSRM, CWRM were compared to the results obtained from the destructive testby using th IRT. At the result, the reduced dynamic modulus derived from DSRM has the most lowest error. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002114147 | oai_dc | 고속도로 노후 콘크리트 포장 보강의 경제성 분석 사례 연구 | Case Studies of the Life Cycle Cost Analysis for Rehabilitation of Deteriorated Expressway Concrete Pavements | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"서영찬(한양대학교); 박지원(한양대학교); 김찬우(한국도로공사)"
] | PURPOSES: Concrete pavement has been used in the construction of the Jungbu expressway in 1987. More than 60% of the pavement on the expressway is currently made of concrete, but most has been used far beyond their design life. Pavement life has been extended through routine maintenance or overlay. However, the structural capacity of the pavement has reached its limit, and extensive rehabilitation/reconstruction with long time traffic blocking should be considered. The three following issues on concrete rehabilitation/reconstruction will be discussed: (1) economic comparison of asphalt inlay and asphalt overlay, (2) economic comparison preventive overlay on a section which is currently good and routine overlay on the section which will be poor, and (3) economic analysis of early-strength concrete when it is used in concrete reconstruction.
METHODS: First, various life cycle cost analysis tools were compared, and the proper tool for the extensive rehabilitation/reconstruction was selected. Second, a sensitivity analysis of the selected tool was performed to find the influential input variables, which should be carefully selected in the analysis. Third, three case studies, which can be issues in the rehabilitation/reconstruction of the expressway concrete pavement in Korea, were performed.
RESULTS: Asphalt overlay without milling the deteriorated concrete showed 18~25% lower life cycle cost than the current asphalt inlay with milling. The good current preventive overlay on the section was economically justified within the scope of this study. The construction cost limit of the early strength concrete was suggested to be economical for 1, 3, and 7 days of construction alternative opening.
CONCLUSIONS: CA4PRS was a viable tool for comparing various rehabilitation/reconstruction issue alternatives. Several concrete issues associated with the rehabilitation/reconstruction of the deteriorated concrete pavement were discussed as mentioned above. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002114152 | oai_dc | Analysis of Lane-by-lane Traffic Flow Characteristics in Korea by Using Multilane Freeway Data | Analysis of Lane-by-lane Traffic Flow Characteristics in Korea by Using Multilane Freeway Data | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"윤재용(명지대학교); 김현명(명지대학교); 이의은(명지대학교); 양인철(한국건설기술연구원); 전우훈(한국건설기술연구원)"
] | PURPOSES: This study analyzed the lane-by-lane traffic flow characteristics in Korea by using real-world data, including congestion levels, for 2-, 3-, and 4-lane freeways.
METHODS : On the basis of a literature review, lane flow and speed characteristics were analyzed using flow measurements and speed ratios. In addition, the effect of congestion levels on traffic flow were visualized using rescaled cumulative plots.
RESULTS: Driver behavior varied depending on the congestion level. During free-flow conditions, the lane-use ratio of individual lanes varied largely, whereas during congestion, the ratio was nearly the same for all lanes (i.e., equilibrium). During maximum-flow and congestion conditions, the median lane was used more than the shoulder lane, whereas during all other conditions, the shoulder lane had a higher lane-use ratio. In 3- or 4-lane freeways, the lane-use ratio of the median lane always exceeded 1 and was the highest during free-flow conditions.
CONCLUSIONS : The results of the present analysis can be used as an index to predict congestion before a lane is overcapacitated.
Moreover, the results can be applied in variable lane guidance systems, such as car navigation systems and variable message displays, to control traffic flow. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002114146 | oai_dc | 시멘트 페이스트의 슬럼프 유동 모사를 위한 분석적 해의 검토 | Review on Analytical Solutions for Slump Flow of Cement Paste | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"윤태영(한국건설기술연구원)"
] | PURPOSES : In this paper, the analytical solutions suggested to simulate the behavior of rheological fluids were rigorously re-derived and investigated for fixed conditions to evaluate the applicability for the solutions on a mini-cone slump test of cement paste. The selected solutions with proper boundary conditions can be used as reference solutions to evaluate the performance of numerical simulation approaches, such as the discrete element method.
METHODS: The slump, height, and spread radius for the given boundary and yield stress conditions that are determined by five different analytical solutions are compared.
RESULTS: The analytical solution based on fluid mechanics for pure shear flow shows similar results to that for intermediate flow at low yield stresses. The fluid mechanics-based analytical solution resulted in a very similar trend to the geometry-based analytical solution.
However, it showed a higher slump at high yield stress and lower slump at low yield stress ranges than the geometry-based analytical model. The analytical solution based on the mini-cone geometry was not significantly affected by the yield criteria, such as von Mises and Tresca.
CONCLUSIONS: Even though differences among the analytical solutions in terms of slump and spread radius existed, the difference can be considered insignificant when the solutions were used as reference to evaluate the appropriateness of numerical approaches, such as the discrete element method. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002114151 | oai_dc | 장기간 현장조사를 통한 연속철근 콘크리트 포장의 균열간격과 균열폭 특성 분석 | Characteristics of Crack Spacing and Crack Width of Continuously Reinforced Concrete Pavement Based on Long-Term Field Surveys | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"오한진(한국도로공사 도로교통연구원); 조영교(경희대학교); 김성민(경희대학교)"
] | PURPOSES : The purpose of this study is to investigate characteristics of crack spacing and crack width and their relationship in continuously reinforced concrete pavement (CRCP) based on the data obtained from long-term field observations.
METHODS: The crack spacings and crack widths are measured periodically over 10 years at two different CRCP sections: one with asphalt bond breaker beneath concrete slab, and the other with bonded lean concrete base beneath concrete slab. The effects of steel ratio, type of underlying layer, terminal treatment method, and seasonal temperature change on the crack characteristics are evaluated by analyzing the measured data.
RESULTS: The CRCP with lean concrete base shows smaller crack spacings than those of the CRCP with asphalt bond breaker. As the steel ratio increases, both the crack spacing and crack width tend to decrease. The crack width becomes larger as the crack age increases, but once the crack age is over a certain value the crack width tends to converge. When the terminal anchor lug system is not used and the expansion joints are employed at the terminals, the crack spacings and crack widths increase near the terminal sections. The crack spacing and crack width seem to be proportional each other, but not necessarily linearly, and their relationship is more distinguished in the summer when the crack widths become smaller.
CONCLUSIONS : The steel ratio, underlying layer type, terminal treatment method, and seasonal temperature change affect the characteristics of cracks and the crack spacing and crack width are related to each other. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002114144 | oai_dc | GPC를 이용한 아스팔트 혼합물의 단기노화 조건에 따른 노화도 분석 | Analysis of Binder Aging Levels in Asphalt Mixture Caused by Short-term Aging Conditions Using the GPC Technique | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김영삼(강원대학교); 윤지현(강원대학교); 정승호(한국건설생활환경시험연구원); 김광우(강원대학교)"
] | PURPOSES: This study aims to show the difference of the binder aging level in the hot-mix asphalt (HMA) mixture after short-term aging (SA) under different aging conditions, such as mixture temperature and duration in hour.
METHODS: Three SA times (i.e., 1 h, 2 h, and 4 h) at two temperatures (i.e., 160℃ and 180℃) were used for the normal mixtures prepared using a PG64-22 asphalt. The field long-term aging (LA) was simulated by applying the same LA procedure (65 h at 110℃) to all compacted specimens, prepared at the air void of 7% using each SA-treated mixture, in a convection oven. The binder aging level was measured in terms of large molecular size by gel-permeation chromatography (GPC) from the mixture and the absolute viscosity (AV) from the recovered binder.
The aging levels were evaluated using those two properties after SA and LA, and then compared based on the normal SA (NSA) mixture (1 h at 160℃). The service life reduction caused by SA in various conditions was estimated based on the aging level of the field cores from different locations in various service lives.
RESULTS: The results of the laboratory evaluation indicated that the binder of the mixture, which was treated at longer SA time and higher temperature, showed a significantly higher aging level than the NSA mixture. The binder aging level from a longer time, such as 2 h and 4 h SA, or at a higher temperature (180℃), were estimated to be similar to that of the mixtures, which had already been in field service for several years.
CONCLUSIONS : The HMA mixture should be produced at a moderate temperature, such as 160℃, and placed within a limited hauling and queuing time to avoid a significant short-term aging of the binder before placement in the field pavement. The SA for a longer time at a higher temperature than the NSA condition was found to be detrimental to the service life of the asphalt pavement. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002114157 | oai_dc | 미시적 도로주행 조건을 반영한 배출량 산정 방법의 적용 사례 연구 | Application of an Emission Estimation Methodology to Reflect Microscale Road Driving Conditions | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"허혜정(한국건설기술연구원); 윤천주(한국건설기술연구원); 양충헌(한국건설기술연구원); 김진국(한국건설기술연구원)"
] | PURPOSES : This study proposes a methodology to collect data necessary for microlevel emission estimation, such as second-by-second speeds and road grades, and to accordingly estimate emissions.
METHODS: To ease data collection for microlevel emission estimation, a vehicle equipped with speed- and location-recording instruments as well as equipment for measuring road geometry was used. As a case study, this vehicle and the proposed methodology were used on a 10- km-long highway in Yongin City, Korea. Emissions from the vehicle during driving were estimated in various microscale driving conditions.
RESULTS : Differences in the estimated emission under different microscale driving conditions cannot be ignored. Compared with the estimations obtained when second-by-second data were not considered, CO and NOx emissions were more than threefold higher when considering second-by-second speed; similarly, CO and NOx emission estimations were higher by approximately 10% and 3%, respectively, when considering second-by-second road grade.
CONCLUSIONS : The proposed method can estimate vehicle emissions under real-world driving conditions in such applications as road design and traffic policy assessments. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002114150 | oai_dc | 유리섬유 보강 아스팔트 혼합물의 현장 적용성 평가 | A Study on Field Application of Glass Fiber-reinforced Asphalt Mixtures | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"엄병식(한국건설기술연구원); 유평준(한국건설기술연구원); 함상민(한국건설기술연구원); 서영찬(한양대학교)"
] | PURPOSES: This study evaluated the field applicability and laboratory performance of glass fiber-reinforced asphalt (GFRA) mixtures.
METHODS : The general hot-mix asphalt (HMA) and GFRA mixtures were paved in five sites, including three national highways, one express highway, and an arterial road, to evaluate field applicability and durability. The plant mixing and construction method for the GFRA were similar to those for the general HMA. The lab performances of the field samples were relatively compared through the mechanical measures from the Marshall stability, indirect tensile strength, and dynamic stability. The field performance was surveyed after a year.
RESULTS : The lab tests verified the superior lab performances of the GFRA compared to the general HMA. The Marshall stability of the GFRA increased for about 128% of the general HMA. The indirect tensile strength of the GFRA was 115% greater than that of the general HMA. The dynamic stability of the GFRA resulted in 16,180 reps/mm, which indicated that high rut resistance may be expected. No noticeable defects, such as cracks or deformation, were observed for the GFRA sections after a year.
CONCLUSIONS: The lab tests and field survey for the five GFRA sites resulted in superior performances compared to the general HMA. The relatively low-cost GFRA, which required no pre-processing procedures, such as polymer modification, may be a promising alternative to the polymer-modified asphalt mixtures. The long-term performance will be verified by the superior field durability of the GFRA in the near future. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002114149 | oai_dc | 탄소섬유 쉬트를 활용한 도로 결빙방지 시스템 개발을 위한 기초연구 | Fundamental Study for Development of an Anti-Icing Pavement System Using Carbon-Fiber Sheet | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"임치수(전북대학교); 박광필(군산대학교); 이재준(전북대학교); 이병석(전북대학교)"
] | PURPOSES : This paper aims to develop a road pavement de-icing system using carbon sheet to replace the older snow de-icing method. Carbon sheet is a light and high-strength metal. Hence, various bodies of research for its applications in many industries have progressed.
METHODS : The experiment was conducted in a laboratory. The carbon sheet supplied voltage through a power supply system, and produced heat transfers to the concrete surface. Various factors, such as pavement material, carbon sheet width, penetration depth, and freezingthawing resistance, were considered in the conducted experiments to confirm the heating transfer efficiency of the carbon sheet.
RESULTS : The carbon sheet used was a conductor. Therefore, it produced heat if voltage was supplied. The exposed carbon sheet on the atmosphere did not affect the carbon sheet width when it provided constant voltage. However, the sheet showed different heating behaviors by width change when the carbon sheet penetrated into the concrete. Moreover, the freezing-thawing resistance was decreased by the carbon sheet with increasing width.
CONCLUSIONS : The experiments confirmed the possibility of developing a road snow melting system using a carbon sheet. The antiicing system using the carbon sheet to replace the traditional anti-icing system has disadvantages of environmental pollution risk and electric leakage. The pavement also improved its toughness resistance. The utilization value will be very high in the future if carbon sheet heat loss can be minimized and durability is improved. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002114156 | oai_dc | 판별분석을 활용한 주·야간 고속도로 교통사고 영향요인 비교연구 | Discriminant Analysis of Factors Affecting Traffic Accident Severity During Daytime and Nighttime | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김경태(서울시립대학교); 이수범(서울시립대학교); 최지혜(서울시립대학교 교통공학과); 박시내(서울시립대학교 교통공학과); 서금열(서울시립대학교 교통공학과)"
] | PURPOSES : Low visibility caused by dark surroundings at nighttime affects the likelihood of accidents, and various efforts, such as installing road safety facilities, have been made to reduce accidents at night. Despite these efforts, the nighttime severity index (SI) in Korea was higher than the daytime SI during 2011-2014. This study determined the factors affecting daytime and nighttime accident severity through a discriminant analysis.
METHODS: Discriminant analysis.
RESULTS: First, drowsiness, lack of attention, and lighting facilities affected both daytime and nighttime accident severity. Accidents were found to be caused by a low ability to recognize the driving conditions and a low obstacle avoidance capability. Second, road conditions and speeding affected only the daytime accident severity. Third, failure to maintain a safe distance significantly affected daytime accident severity and nonsignificantly affected nighttime accident severity. The majority of such accidents were caused by rear-end collisions of vehicles driving in the same direction; given the low relative speed difference in such cases, the shock imparted by the accidents was minimal.
CONCLUSIONS: Accidents caused by a failure to maintain a safe distance has lower severity than do accidents caused by other factors. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002114153 | oai_dc | 회전교차로와 신호교차로의 설치기준 지표 비교에 관한 연구 | Comparative Study of Two Measures of Traffic Flow Effectiveness at Roundabouts and Signalized Intersections | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김주현(안양대학교); 신언교(안양대학교); 권민영(안양대학교 도시정보공학과)"
] | PURPOSES : This study compared two measures of traffic flow effectiveness on roads with roundabouts and signalized intersections and determined the more appropriate measure.
METHODS: In addition to average delay time, the conventionally used measure, average travel time was introduced to measure traffic flow effectiveness because it is able to be obtained through field survey and reflect different travel distances and speed limits of roundabouts and signalized intersections. Using the two measures, roundabouts and signalized intersections were compared through simulations in terms of traffic flow effectiveness.
RESULTS : For one-way single-lane roads, the two measures indicated consistent results that roundabouts were more effective than were signalized intersections when the traffic volume was less than 300 vphpl but vice versa when it exceeded 450 vphpl; however, the measures yielded inconsistent results when the volume was 350~400 vphpl. For one-way double-lane roads, the two measures indicated consistent results that roundabouts were more effective than were signalized intersections when the volume was less than 200 vphpl but vice versa when it exceeded 400 vphpl; however, the measures yielded inconsistent results when the volume was 250~350 vphpl. The results obtained using the two measures differed substantially for double-lane roads because behaviors such as weaving and lane changing at roundabouts are more common in double-lane roads than in single-lane roads.
CONCLUSIONS : The average delay time would be lower on roads with roundabouts, but average travel time would be lower on roads with signalized intersections. Thus, evaluating the relative effectiveness of roads with roundabouts and signalized intersections by using average delay time alone would be inappropriate, whereas using average travel time as the evaluation index would yield fairer results. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002114154 | oai_dc | 효율적인 교통량 조사를 계획하기 위한 조사구간의 통계적 특성 분류 연구 | Statistical Classification of Highway Segments for Improving the Efficiency of Short-term Traffic Count Planning | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"정유석(한국건설기술연구원); 오주삼(한국건설기술연구원)"
] | PURPOSES: The demand for extending national highways is increasing, but traffic monitoring is hindered because of resource limitations.
Hence, this study classified highway segments into 5 types to improve the efficiency of short-term traffic count planning.
METHODS : The traffic volume trends of 880 highway segments were classified through R-squared and linear regression analyses; the steadiness of traffic volume trends was evaluated through coefficient of variance (COV), and the normality of the data were determined through the Shapiro-Wilk W-test.
RESULTS : Of the 880 segments, 574 segments had relatively low COV and were classified as type 1 segments, and 123 and 64 segments with increasing and decreasing traffic volume trends were classified as type 2 and type 3 segments, respectively; 80 segments that failed the normality test were classified as type 4, and the remaining 39 were classified as type 5 segments.
CONCLUSIONS : A theoretical basis for biennial count planning was established. Biennial count is recommended for types 1~4 because their mean absolute percentage errors (MAPEs) are approximately 10%. For type 5 (MAPE =19.26%), the conventional annual count can be continued. The results of this analysis can reduce the traffic monitoring budget. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002114145 | oai_dc | 1차로 전면차단 후 도로포장 보수방법의 효과분석 (김천~선산 사례중심) | Evaluation of a Traffic Lane Closure and Pavement Repair for a Certain Period (Focusing on the Gimcheon~Sunsan Project) | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"류성우(한국도로공사 도로교통연구원); 박권제(한국도로공사); 한승환(한국도로공사 도로교통연구원); 최인구(한국도로공사 재난안전처); 조윤호(중앙대학교)"
] | PURPOSES: This study supports the evidence that it is possible to rehabilitate a damaged pavement with a lane closure specifically based on the Gimcheon~Sunsan project.
METHODS : The prediction results from the simulation programs were compared with field monitoring, which focused on traffic management planning, congestion (length, time, and passing speed), bypass, and user cost, among others.
RESULTS : The research results showed that lane closure application and pavement repair of the aged pavement in Korea were possible, even though the prediction results were minimally different from the field monitoring. The road agency contributes to service life extension of the rehabilitated pavement using this method.
CONCLUSIONS: A marginal effect caused by the lane closure was observed on travelling users or vehicles, and the user cost of pavement repair decreased. Therefore, introducing the repair method or rehabilitation in Korea is possible. Information dissemination through various media was properly done to execute the project well. Moreover, the construction area traffic utilized nearby alternative roads. Therefore, improving the repaired pavemen’s service life while ensuring that the pavement management agency can provide a road with comfortable user riding quality was possible. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002114148 | oai_dc | 장래교통수요예측을 고려한 도로 유지관리 방안 | Road Maintenance Planning with Traffic Demand Forecasting | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김정민(한밭대학교); 최승현(한밭대학교); 도명식(한밭대학교); 한대석(한국건설기술연구원)"
] | PURPOSES : This study aims to examine the differences between the existing traffic demand forecasting method and the traffic demand forecasting method considering future regional development plans and new road construction and expansion plans using a four-step traffic demand forecast for a more objective and sophisticated national highway maintenance. This study ultimately aims to present future pavement deterioration and budget forecasting planning based on the examination.
METHODS: This study used the latest data offered by the Korea Transport Data Base (KTDB) as the basic data for demand forecast. The analysis scope was set using the Daejeon Metropolitan City’s O/D and network data. This study used a traffic demand program called TransCad, and performed a traffic assignment by vehicle type through the application of a user equilibrium-based multi-class assignment technique. This study forecasted future traffic demand by verifying whether or not a realistic traffic pattern was expressed similarly by undertaking a calibration process. This study performed a life cycle cost analysis based on traffic using the forecasted future demand or existing past pattern, or by assuming the constant traffic demand. The maintenance criteria were decided according to equivalent single axle loads (ESAL). The maintenance period in the concerned section was calculated in this study. This study also computed the maintenance costs using a construction method by applying the maintenance criteria considering the ESAL. The road user costs were calculated by using the user cost calculation logic applied to the Korean Pavement Management System, which is the existing study outcome.
RESULTS : This study ascertained that the increase and decrease of traffic occurred in the concerned section according to the future development plans. Furthermore, there were differences from demand forecasting that did not consider the development plans. Realistic and accurate demand forecasting supported an optimized decision making that efficiently assigns maintenance costs, and can be used as very important basic information for maintenance decision making.
CONCLUSIONS : Therefore, decision making for a more efficient and sophisticated road management than the method assuming future traffic can be expected to be the same as the existing pattern or steady traffic demand. The reflection of a reliable forecasting of the future traffic demand to life cycle cost analysis (LCCA) can be a very vital factor because many studies are generally performed without considering the future traffic demand or with an analysis through setting a scenario upon LCCA within a pavement management system. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002100075 | oai_dc | 기계식 연속철근콘크리트포장의 현장 적용성 및 거동 분석 연구 | Field Application and Performance of Continuously Reinforced Concrete Pavement via Mechanical Tube-feeding Method | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"최훈석(한국도로공사)"
] | PURPOSES : The field application and performance of continuously reinforced concrete pavement (CRCP), constructed by using the mechanical tube-feeding method, are evaluated in this study.
METHODS: The location of the rebar was evaluated by using the MIRA system. The early-age CRCP performance was evaluated via visual survey, in which the crack spacing and crack width were examined.
RESULTS: The location of longitudinal reinforcing bars was evaluated via MIRA testing and the results showed that the longitudinal rebars all lie within a given tolerance limit (±2.5 cm) of the target elevation. In addition, owing to the low temperature when the concrete was pured, the crack spacing in the Dae-Gu direction is slightly wider than that of the Gwang-Ju direction. Almost all of the crack spacings lay within the range of 1.0 m~3.0 m. A crack width of <0.3 mm was measured at the pavement surface. However, as revealed by the field survey, the crack spacing was not correlated with the crack width.
CONCLUSIONS : In CRCP constructed by using the mechanical tube-feeding method, almost all of the longitudinal reinforcing bars lay within the tolerance limit (2.5 cm) of the target elevation. The concrete-placing temperature affects the crack spacing, owing to variations in the zero-stress temperature. Crack survey results show that there is no correlation between the crack spacing and crack width in CRCP. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002100072 | oai_dc | 국내 현장중온재생공법의 효율적인 가열공정을 위한 기초연구 | A Fundamental Study for the Efficient Heating System for Warm In-Place Recycling in Korea | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김대훈(전북대학교); 권수안(한국건설기술연구원); 이재준(전북대학교)"
] | PURPOSES: The objective of this study is to determine the milling temperature that minimizes the binder-induced damage to the aggregate; this is achieved by evaluating the temperature dependence of the viscosity of the asphalt binder, with the aim of developing an effective heating process for warm in-place recycling.
METHODS : The validity of the indoor test was confirmed by conducting an internal heating test based on the on-site heating test. In addition, the adhesive power of the binder was measured at various temperatures (30℃, 40℃, 50℃, 60℃, 70℃) via three types of measuring methods.
RESULTS: The surface temperature spectrum of field test was slight different with that of laboratory test. But, the spectra of inner temperature between the field and the laboratory was almost similar. Also, the adhesion of the asphalt binder was measured from 30℃ to 70℃. The adhesion of the binder was significantly decreased from 60℃. Contrary to other temperature, the adhesion was slightly changed from 60℃ to 70℃. Also the inner temperature between two different heating methods was shown similar temperature spectra.
CONCLUSIONS: The pavement heating temperature spectrum of hot in place recycling method was simulated by a laboratory test. Based on this study, the optimum temperature was 60℃~70℃ for reducing aggregate damage during milling process. The susceptibility heating method developed in this study can be maintained the optimum inner temperature range. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002100077 | oai_dc | 이산요소법을 이용한 수치해석에서의 상사성 이론의 적용성 검토 | Feasibility Study on Similarity Principle in Discrete Element Analysis | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"윤태영(한국건설기술연구원); 박희문(한국건설기술연구원)"
] | PURPOSES : The applicability of the mechanics-based similarity concept (suggested by Feng et al.) for determining scaled variables, including length and load, via laboratory-scale tests and discrete element analysis, was evaluated.
METHODS: Several studies on the similarity concept were reviewed. The exact scaling approach, a similarity concept described by Feng, was applied in order to determine an analytical solution of a free-falling ball. This solution can be considered one of the simplest conditions for discrete element analysis.
RESULTS : The results revealed that 1) the exact scaling approach can be used to determine the scale of variables in laboratory tests and numerical analysis, 2) applying only a scale factor, via the exact scaling approach, is inadequate for the error-free replacement of small particles by large ones during discrete element analysis, 3) the level of continuity of flowable materials such as SCC and cement mortar seems to be an important criterion for evaluating the applicability of the similarity concept, and 4) additional conditions, such as the kinetics of particle, contact model, and geometry, must be taken into consideration to achieve the maximum radius of replacement particles during discrete element analysis.
CONCLUSIONS : The concept of similarity is a convenient tool to evaluate the correspondence of scaled laboratory test or numerical analysis to physical condition. However, to achieve excellent correspondence, additional factors, such as the kinetics of particles, contact model, and geometry, must be taken into consideration. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002100060 | oai_dc | Correlation between the Properties of Superpave Binder and Engineering Properties of Recycled Aged CRM Mixtures | Correlation between the Properties of Superpave Binder and Engineering Properties of Recycled Aged CRM Mixtures | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김현환(Texas State University); 정규동(한국건설기술연구원 도로시설연구실); 이문섭(한국건설기술연구원); 이순제(Texas State University)"
] | The performance properties (indirect tensile strength, rutting resistance, and resilient modulus) of recycled aged CRM mixtures and their correlation with Superpave binder properties (viscosity, high failure temperature, G*sinδ, and stiffness) were investigated.
METHODS: A series of Superpave binder tests was performed by using a rotational viscometer, DSR, and BBR to evaluate the performance properties. In addition, the CRM mixes were artificially aged through accelerated aging processes, and their properties were evaluated. The correlation between the properties of recycled aged CRM binders and the engineering properties of recycled aged CRM mixtures was experimentally determined.
RESULTS : The rut depth values decreased and the ITS values increased with increasing high failure temperature. In general, the resilient modulus properties seemed to be poorly correlated with the high-temperature values, regardless of the aggregate source.
CONCLUSIONS: The recycled aged CRM binders and mixtures can lead to satisfactory performance, and the properties of these binders are strongly correlated with the engineering properties of the mixtures. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002100080 | oai_dc | 한국형포장설계프로그램 및 유한요소해석을 이용한 동상방지층의 구조적 성능 평가 | Finite Element Analysis of Structural Performance of Anti-Freezing Layer via the Korea Pavement Research Program | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김도완((주)건화); 이준규(서울과학기술대학교); 문성호(서울과학기술대학교)"
] | PURPOSES : Nowadays, cavity phenomena occur increasingly in pavement layers of downtown areas. This leads to an increment in the number of potholes, sinkholes, and other failure on the road. A loss of earth and sand from the pavement plays a key role in the occurrence of cavities, and, hence, a structural-performance evaluation of the pavement is essential.
METHODS: The structural performance was evaluated via finite-element analysis using KPRP and KICTPAVE. KPRP was developed in order to formulate a Korean pavement design guide, which is based on a mechanical-empirical pavement design guide (M-EPDG).
RESULTS: Installation of the anti-freezing layer yielded a fatigue crack, permanent deformation, and international roughness index (IRI) of 13%, 0.7 cm, and 3.0 m/km, respectively, as determined from the performance analysis conducted via KPRP. These values satisfy the design standards (fatigue crack: 20%, permanent deformation: 1.3 cm, IRI: 3.5 m/km). The results of FEM, using KICTPAVE, are shown in Figures 8~12 and Tables 3~5.
CONCLUSIONS: The results of the performance analysis (conducted via KPRP) satisfy the design standards, even if the thickness of the anti-freezing layer is not considered. The corresponding values (i.e., 13%, 0.7 cm, and 3.0 m/km) are obtained for all conditions under which this layer is applied. Furthermore, the stress and strain on the interlayer between the sub-grade and the anti-freezing layer decrease gradually with increasing thickness of the anti-freezing layer. In contrast, the strain on the interlayer between the sub-base and the anti-freezing layer increases gradually with this increase in thickness. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002100079 | oai_dc | 유한요소해석을 통한 현장 가열 재활용 시공 장비의 가열판 용량에 따른아스팔트 포장의 열전도성 평가 | Finite Element Analysis of Heat Transfer Effects on Asphalt Pavement Heated by Pre-Heater Unit Used in Hot In-Place Recycling | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이강훈(한국건설기술연구원); 임진선(삼우아이엠씨 기술연구소); 정규동(한국건설기술연구원 도로시설연구실); 임정혁(한국건설기술연구원); 권수안(한국건설기술연구원); 김용주(한국건설기술연구원)"
] | PURPOSES: The national highways and expressways in Korea constitute a total length of 17,951 km. Of this total length of pavement, the asphalt pavement has significantly deteriorated, having been in service for over 10 years. Currently, hot in-place recycling (HIR) is used as the rehabilitation method for the distressed asphalt pavement. The deteriorated pavement becomes over-heated, however, owing to uncontrolled heating capacity during the pre-heating process of HIR in the field.
METHODS: In order to determine the appropriate heating method and capacity of the pre-heater at the HIR process, the heating temperature of asphalt pavement is numerically simulated with the finite element software ABAQUS. Furthermore, the heating transfer effects are simulated in order to determine the inner temperature as a function of the heating system (IR and wire). This temperature is ascertained at 300 ℃, 400℃, 500℃, 600℃, 700°℃, and 800℃ from a slab asphalt specimen prepared in the laboratory. The inner temperature of this specimen is measured at the surface and five different depths (1 cm, 2 cm, 3 cm, 4 cm, and 5 cm) by using a data logger.
RESULTS: The numerical simulation results of the asphalt pavement heating temperature indicate that this temperature is extremely sensitive to increases in the heating temperature. Moreover, after 10 min of heating, the pavement temperature is 36%~38% and 8%~10% of the target temperature at depths of 25 mm and 50 mm, respectively, from the surface. Therefore, in order to achieve the target temperature at a depth of 50 mm in the slab asphalt specimen, greater heating is required of the IR system compared to that of the gas.
CONCLUSIONS : Numerical simulation, via the finite element method, can be readily used to analyze the appropriate heating method and theoretical basis of the HIR method. The IR system would provide the best heating method and capacity of HIR heating processes in the field. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002100082 | oai_dc | 자연친화적인 급내리막 직선부에서 GHG 배출지표에 근거한 속도유지표준화 형태의 교통정온화 | Effect of Traffic Calming Using Speed-Maintained Standardization on Environment-Friendliness of Downward Slope Location based on GHG Emission Indicators | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"홍수정(경기대학교); 오흥운(경기대학교)"
] | PURPOSES: In this paper, the effectiveness of speed-maintained standardization in road geometry on environmental impact at a downward slope location, based on greenhouse gas (GHG) emission indicators, was studied. Specifically, the aim of this study was to ascertain whether speed-maintained standardization resulted in decreased CO2 emissions as well as noise pollution, due to reduced vehicle speeds.
METHODS : In this study, speed-maintained standardization in road geometry was proposed as a means to reduce vehicle speeds, with a view to reducing CO2 emissions and noise pollution. This technique was applied at a downward slope location. The vehicle speeds, CO2 emissions, and noise levels before and after application of speed-maintained standardization were compared.
RESULTS: It was found that speed-maintained standardization was effective as a means to reduce speed, as well as CO2 emissions and noise pollution. By applying speed-maintained standardization, it was confirmed that vehicle speeds were reduced consistently. As a result, CO2 emissions and noise levels were decreased by 9% and 11%, respectively.
CONCLUSIONS : This study confirmed that speed-maintained standardization in road geometry is effective in reducing vehicle speeds, CO2 emissions, and noise levels. Moreover, there is further scope for the application of this method in the design of roads in urban and rural areas, as well as in the design of highways. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002100073 | oai_dc | 도로동공 탐지를 위한 지표투과레이더의 적정 주파수 선정에 관한 연구 | Determining the Optimal Frequency of Ground Penetrating Radar for Detecting Voids in Pavements | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김연태(한국건설기술연구원); 김부일(한국건설기술연구원); 김제원(한국건설기술연구원); 박희문(한국건설기술연구원); 윤진성(서울특별시 품질시험소)"
] | PURPOSES : The objective of this study is to determine the optimal frequency of ground penetrating radar (GPR) testing for detecting the voids under the pavement.
METHODS : In order to determine the optimal frequency of GPR testing for void detection, a full-scale test section was constructed to simulate the actual size of voids under the pavement. Voids of various sizes were created by inserting styrofoam at varying depths under the pavement. Subsequently, 250-, 500-, and 800-MHz ground-coupled GPR testing was conducted in the test section and the resulting GPR signals were recorded. The change in the amplitude of these signals was evaluated by varying the GPR frequency, void size, and void depth.
The optimum frequency was determined from the amplitude of the signals.
RESULTS: The capacity of GPR to detect voids under the pavement was evaluated by using three different ground-coupled GPR frequencies.
In the case of the B-scan GPR data, a parabolic shape occurred in the vicinity of the voids. The maximum GPR amplitude in the A-scan data was used to quantitatively determine the void-detection capacity.
CONCLUSIONS: The 250-MHz GPR testing enabled the detection of 10 out of 12 simulated voids, whereas the 500-MHz testing allowed the detection of only five. Furthermore, the amplitude of GPR detection associated with 250-MHz testing is significantly higher than that of 500-MHz testing. This indicates that 250-MHz GPR testing is well-suited for the detection of voids located at depths ranging from 0.5~2.0 m.
Testing at frequencies lower than 250 MHz is recommended for void detection at depths greater than 2 m. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002100078 | oai_dc | 스프레이 패칭 긴급보수용 개질 유화 아스팔트와100% 순환골재를 사용한 상온 아스팔트 혼합물의 성능 평가 | Performance Evaluation of 100% RAP Asphalt Mixtures using Rapid-Setting Polymer-Modified Asphalt Emulsion for Spray Injection Application | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"임정운(경희대학교); 권봉주((주)오에이티엠엔씨); 김두열((주)오에이티엠엔씨); 이상염(인덕대학교); 이석근(경희대학교)"
] | PURPOSES: The objective of this study was to determine the optimum ratio of mix design, for a reclaimed asphalt pavement (RAP) content of 100%, for spray injection application.
METHODS: A literature review revealed that spray injection is an efficient and cost-effective application for fixing small defective regions of an asphalt pavement. Rapid-setting polymer-modified asphalt mixtures prepared from two types of rapid-setting polymer asphalt emulsion were subjected to Marshall stability and wet track abrasion tests, in order to identify the optimum mix designs.
RESULTS and CONCLUSIONS : Different mix designs of type A and type B emulsions were prepared using RAP and virgin aggregates, in order to compare the performance and determine the optimum mix design. The performance of mixtures prepared with RAP was superior to that of mixtures containing virgin aggregates. Moreover, for optimum ratio of the design, the binder content prepared from RAP was set to 1~2% lower than that consisting of virgin aggregates. Compared to their Type A counterparts, type B mixtures consisting of a reactive emulsion performed better in the Marshall stability and wet track abrasion tests. The initial results confirmed the advantages associated with using RAP for spray injection applications. Further studies will be performed to verify the difference in the optimum mix design and performance obtained in the lab-scale test and tests conducted at the job site by using the spray injection machine. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002100081 | oai_dc | 대규모 미시교통시뮬레이션모형 구축을 위한 O/D 추정 방법 성능 비교 - 중력모형과 QUEENSOD 방법을 중심으로 - | Comparison Study of O/D Estimation Methods for Building a Large - Sized Microscopic Traffic Simulation Network: Cases of Gravity Model and QUEEENSOD Method | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"윤정은(한국건설기술연구원); 이철기(아주대학교); 이환필(한국도로공사); 김경현(아주대학교); 박원일(운수산업연구원); 윤일수(아주대학교)"
] | PURPOSES : The aim of this study was to compare the performance of the QUEENSOD method and the gravity model in estimating Origin-Destination (O/D) tables for a large-sized microscopic traffic simulation network.
METHODS : In this study, an expressway network was simulated using the microscopic traffic simulation model, VISSIM. The gravity model and QUEENSOD method were used to estimate the O/D pairs between internal and between external zones.
RESULTS: After obtaining estimations of the O/D table by using both the gravity model and the QUEENSOD method, the value of the root mean square error (RMSE) for O/D pairs between internal zones were compared. For the gravity model and the QUEENSOD method, the RMSE obtained were 386.0 and 241.2, respectively. The O/D tables estimated using both methods were then entered into the VISSIM networks and calibrated with measured travel time. The resulting estimated travel times were then compared. For the gravity model and the QUEENSOD method, the estimated travel times showed 1.16% and 0.45% deviation from the surveyed travel time, respectively.
CONCLUSIONS : In building a large-sized microscopic traffic simulation network, an O/D matrix is essential in order to produce reliable analysis results. When link counts from diverse ITS facilities are available, the QUEENSOD method outperforms the gravity model. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002100066 | oai_dc | 터널내 온도조건을 고려한 콘크리트 포장의 거동 및 성능 평가 | Behavior and Performance Evaluation of a Concrete Pavement Considering the Temperature Condition in a Tunnel | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"류성우(한국도로공사 도로교통연구원); 박준영(한국도로공사 도로교통연구원); 김형배(한국도로공사); 이재훈(한국도로공사 도로교통기술원); 조윤호(중앙대학교)"
] | PURPOSES: This paper investigates behavior and performance of concrete pavement in tunnel based on temperature data from field.
METHODS : In this study, there are 4 contents to evaluate concrete pavement in tunnel, First, Comparison for distress was conducted at outside, transition, and inside part of tunnel. Secondly, temperature data was collected in air and inside concrete pavement in outside and inside tunnel. Thirdly, FEM analysis was performed to evaluate stress condition, based on temperature data from field. Finally, performance prediction was done with KPRP program.
RESULTS: From the distress evaluation, failure of inside tunnel was much less than it of outside tunnel, Temperature change in tunnel was less than out side, and also it was more stable. According to result of FEM analysis, both curling stress status of inside tunnel was lower than it of outside tunnel. Based on KPRP program analysis, performance of inside tunnel was longer than outside.
CONCLUSIONS : Through all study about behavior and performance of concrete pavement in tunnel, condition in tunnel has more advantages from environmental and distress point of view. Therefore, performance of inside tunnel was better than outside. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002100070 | oai_dc | 구조해석을 통한 터널내 줄눈 콘크리트 포장의 거동분석 | Evaluation of Behavior of Jointed Concrete Pavement Considering Temperature Condition in a Tunnel by Finite Element Method | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"류성우(한국도로공사 도로교통연구원); 박준영(한국도로공사 도로교통연구원); 김형배(한국도로공사); 이재훈(한국도로공사 도로교통기술원); 조윤호(중앙대학교)"
] | PURPOSES: The behavior of a concrete pavement in a tunnel was investigated, based on temperature data obtained from the field and FEM analysis.
METHODS: The concrete pavement in a tunnel was evaluated via two methods. First, temperature data was collected in air and inside the concrete pavement both outside and inside the tunnel. Second, FEM analysis was used to evaluate the stress condition associated with the slab thickness, joint spacing, dowel, and rock foundation, based on temperature data from the field.
RESULTS : Temperature monitoring revealed that the temperature change in the tunnel was lower and more stable than that outside the tunnel. Furthermore, the temperature difference between the top and bottom of the slab was lower inside the tunnel than outside. FEM analysis showed that, in many cases, the stress in the concrete pavement in the tunnel was lower than that outside the tunnel.
CONCLUSIONS : Temperature monitoring and the behavior of the concrete pavement in the tunnel revealed that, from an environmental point of view, the condition in the tunnel is advantageous to that outside the tunnel. The behavior in the tunnel was significantly less extreme, and therefore the concrete pavement in the tunnel could be designed more economically, than that outside the tunnel. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002055708 | oai_dc | 무기계 바인더를 이용한 탄소저감형 흙포장의 성능평가 | Performance Evaluation of Carbon-Reducing Soil Pavement using Inorganic Binder | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"유지형(경일대학교); 곽기봉(경일대학교); 김대성(경일대학교)"
] | PURPOSES: This study intends to develop an inorganic soil pavement material using industrial by-products and to evaluate its applicability as a road pavement material.
METHODS: In this study, a compressive strength experiment was conducted based on the NaOH solution molarity and water glass content to understand the strength properties of the soil pavement material according to the mixing ratio of alkali activator. In addition, the strength characteristic of the inorganic soil pavement material was analyzed based on the binder content. The performance of the soil pavement was evaluated by conducing an accelerated pavement test and a falling weight deflectometer (FWD) test.
RESULTS: As a result of the soil pavement material test based on the mixture ratio of alkali activator, it was identified that the activator that mixed a 10 M NaOH solution to water glass in a 5:5 ratio is appropriate. As a result of the inorganic soil pavement materials test based on the binder content, the strength development increased sharply when the amount of added binder was over 300 kg; this level of binder content satisfied 28 days of 18 MPa of compression strength, which is the standard for existing soil pavement design. According to the measured results of the FWD test, the dynamic k-value did not show a significant difference before or after the accelerated pavement testing. Furthermore, the effective modulus decreased by approximately 50%, compared with the initial effective modulus for pedestrian pavement.
CONCLUSIONS: Based on these results, inorganic soil pavement can be applied by changing the mixture proportions according to the use of the pavement, and can be utilized as road pavement from light load roads to access roads. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002055722 | oai_dc | 존별 특성을 반영한 교통사고밀도 모형- 청주시 사례를 중심으로 - | Traffic Accident Density Models Reflecting the Characteristics of the Traffic Analysis Zone in Cheongju | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김경용(충북대학교); 백태헌(충북대학교); 임진강(충북대학교); 박병호(충북대학교)"
] | PURPOSES: This study deals with the traffic accidents classified by the traffic analysis zone. The purpose is to develop the accident density models by using zonal traffic and socioeconomic data.
METHODS : The traffic accident density models are developed through multiple linear regression analysis. In this study, three multiple linear models were developed. The dependent variable was traffic accident density, which is a measure of the relative distribution of traffic accidents. The independent variables were various traffic and socioeconomic variables.
CONCLUSIONS : Three traffic accident density models were developed, and all models were statistically significant. Road length, trip production volume, intersections, van ratio, and number of vehicles per person in the transportation-based model were analyzed to be positive to the accident. Residential and commercial area ratio and transportation vulnerability ratio obtained using the socioeconomic-based model were found to affect the accident. The major arterial road ratio, trip production volume, intersection, van ratio, commercial ratio, and number of companies in the integrated model were also found to be related to the accident. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002055716 | oai_dc | 표면 에너지 원리를 이용한 칩실 포장의 초기 점착력 특성 연구 | Study on Early Adhesive Characteristic of Chip Seals Using a Surface Energy Approach | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"임정혁(한국건설기술연구원)"
] | PURPOSES : The objective of this study is to evaluate the early adhesive characteristic of asphalt emulsions, including polymer-modified emulsions, for chip seals using the surface energy concept, the bitumen bond strength (BBS) test, and the Vialit test.
METHODS : Two general methods, the BBS test and Vialit test, were applied to investigate the bond strength and the aggregate loss, respectively. A new theory, the surface free energy (SFE) theory, was used to evaluate the adhesive characteristic between the emulsion and the aggregate. Based on the theory, the contact angles were measured, and then the surface energy components were calculated. Using those components, the work of adhesion (Wa) was calculated for each emulsion. To ensure reliable results, all the tests were performed under the same conditions, i.e., at 25 ℃ for 240 minutes of curing time. For the materials, three emulsions (CRS-2, CRS-2L, and CRS-2P) and one aggregate type (granite) were employed.
RESULTS AND CONCLUSIONS : Under the same conditions, the modified emulsions showed better adhesive characteristics and curing behaviors than the unmodified emulsions. In addition, there was no significant difference between the various modified emulsions. One of the important findings is that the analysis by Wa presents more sensitive results than other methods. The results of the Wa showed that the CRS-2P emulsion has the best adhesive characteristics. Consequently, the use of modified emulsions for chip seals could prevent aggregate loss and allow open traffic earlier. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002055728 | oai_dc | 실 규모 터널 주행실험을 통한 터널 경계부 휘도 기준의 적정성 검증 | Verification of the Appropriateness of the Standard for Tunnel Luminance in the Threshold Zone Through a Full-scale Tunnel Driving Test | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"박원일(과학기술대학교); 조원범(한국건설기술연구원); 정준화(한국건설기술연구원)"
] | PURPOSES: This study aimed to evaluate the appropriateness of safety with the standard for threshold zone luminance as specified in the Recommendation for Lighting of Traffic Tunnel, which has been widely adopted worldwide.
METHODS: A driving test of the subject in a full-scale road tunnel was conducted. The adaptation luminance and threshold zone luminance, which should be known for the driver to perceive an object within stopping sight distance, were obtained. These values were compared with the adaptation luminance and threshold zone luminance obtained by the existing reduced model test and tunnel lighting standard that has served as a guideline for the current threshold zone luminance standard.
RESULTS : According to this study, threshold zone luminance should be increased to at least 1.8 times the value proposed in the existing studies and to twice the domestic tunnel lighting standard (KS C 3703: 2014).
CONCLUSIONS : The threshold zone luminance proposed in this study differs largely from that obtained from indoor tests and from the current tunnel lighting standard used worldwide; this difference may be attributed to the fact that the indoor tests did not incorporate driving workload, non-uniformity of luminance distribution in terms of sight, and factors that reduce the visibility of the driver, such as the light reflected into the driver’s eyes. Hence, it is necessary to further review the factors that reduce the visibility of drivers approaching tunnels in order to determine the rational tunnel threshold zone luminance. | 토목공학 | null | kci_detailed_000163.xml | |||
ART002055706 | oai_dc | 능동형 소음저감 기법을 위한 도로교통소음 예측 모형 평가 연구 | Evaluation of a Traffic Noise Predictive Model for an Active Noise Cancellation (ANC) System | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"안덕순(한국건설기술연구원); 문성호(서울과학기술대학교); 안오성(서울과학기술대학교); 김도완((주)건화)"
] | PURPOSES: The purpose of this thesis is to evaluate the effectiveness of an active noise cancellation (ANC) system in reducing the traffic noise level against frequencies from the predictive model developed by previous research. The predictive model is based on ISO 9613-2 standards using the Noble close proximity (NCPX) method and the pass-by method. This means that the use of these standards is a powerful tool for analyzing the traffic noise level because of the strengths of these methods. Traffic noise analysis was performed based on digital signal processing (DSP) for detecting traffic noise with the pass-by method at the test site.
METHODS : There are several analysis methods, which are generally divided into three different types, available to evaluate traffic noise predictive models. The first method uses the classification standard of 12 vehicle types. The second method is based on a standard of four vehicle types. The third method is founded on 5 types of vehicles, which are different from the types used by the second method. This means that the second method not only consolidates 12 vehicle types into only four types, but also that the results of the noise analysis of the total traffic volume are reflected in a comparison analysis of the three types of methods. The constant percent bandwidth (CPB) analysis was used to identify the properties of different frequencies in the frequency analysis. A-weighting was applied to the DSP and to the transformation process from analog to digital signal. The root mean squared error (RMSE) was applied to compare and evaluate the predictive model results of the three analysis methods.
RESULTS: The result derived from the third method, based on the classification standard of 5 vehicle types, shows the smallest values of RMSE and max and min error. However, it does not have the reduction properties of a predictive model. To evaluate the predictive model of an ANC system, a reduction analysis of the total sound pressure level (TSPL), dB(A), was conducted. As a result, the analysis based on the third method has the smallest value of RMSE and max error. The effect of traffic noise reduction was the greatest value of the types of analysis in this research.
CONCLUSIONS : From the results of the error analysis, the application method for categorizing vehicle types related to the 12-vehicle classification based on previous research is appropriate to the ANC system. However, the performance of a predictive model on an ANC system is up to a value of traffic noise reduction. By the same token, the most appropriate method that influences the maximum reduction effect is found in the third method of traffic analysis. This method has a value of traffic noise reduction of 31.28 dB(A). In conclusion, research for detecting the friction noise between a tire and the road surface for the 12 vehicle types needs to be conducted to authentically demonstrate an ANC system in the Republic of Korea. | 토목공학 | null | kci_detailed_000164.xml | |||
ART002055724 | oai_dc | 고속도로 오르막차로 교통사고 심각도 영향요인 분석 | Analysis of Factors Affecting Traffic Accident Severity on Freeway Climbing Lanes | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"윤석민(한양대학교); 주신혜(한양대학교); 이설영(한양대학교); 오철(한양대학교)"
] | PURPOSES: The objective of this study is to analyze factors affecting traffic accident severity for determining countermeasures on freeway climbing lanes.
METHODS : In this study, an ordered probit model, which is a widely used discrete choice model for categorizing crash severity, was employed.
RESULTS: Results suggest that factors affecting traffic accident severity on climbing lanes include speed, drowsy driving, grade of uphill 3%, gender (male offender and male victim), and cloud weather.
CONCLUSIONS : Several countermeasures are proposed for improving traffic safety on freeway climbing lanes based on the analysis of crash severity. More extensive analysis with a larger data set and various modeling techniques are required for generalizing the results. | 토목공학 | null | kci_detailed_000164.xml | |||
ART002055721 | oai_dc | Random Parameter를 이용한 4지 신호교차로에서의 교통사고 예측모형 개발 : 부산광역시를 대상으로 | A Development of Traffic Accident Models at 4-legged Signalized Intersections using Random Parameter : A Case of Busan Metropolitan City | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"박민호(한국건설기술연구원); 이동민(서울시립대학교); 윤천주(한국건설기술연구원); 김영록(한국건설기술연구원)"
] | PURPOSES : This study tries to develop the accident models of 4-legged signalized intersections in Busan Metropolitan city with random parameter in count model to understanding the factors mainly influencing on accident frequencies.
METHODS: To develop the traffic accidents modeling, this study uses RP(random parameter) negative binomial model which enables to take account of heterogeneity in data. By using RP model, each intersection’s specific geometry characteristics were considered.
RESULTS : By comparing the both FP(fixed parameter) and RP modeling, it was confirmed the RP model has a little higher explanation power than the FP model. Out of 17 statistically significant variables, 4 variables including traffic volumes on minor roads, pedestrian crossing on major roads, and distance of pedestrian crossing on major/minor roads are derived as having random parameters. In addition, the marginal effect and elasticity of variables are analyzed to understand the variables’impact on the likelihood of accident occurrences.
CONCLUSIONS :This study shows that the uses of RP is better fitted to the accident data since each observations’specific characteristics could be considered. Thus, the methods which could consider the heterogeneity of data is recommended to analyze the relationship between accidents and affecting factors(for example, traffic safety facilities or geometrics in signalized 4-legged intersections). | 토목공학 | null | kci_detailed_000164.xml | |||
ART002055729 | oai_dc | 안전한 도로 공사구간 환경 구축에 필요한 기술의 우선순위 선정 | Prioritization of Potential Technology for Establishing a Safe Work Zone Environment | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김진국(한국건설기술연구원); 양충헌(한국건설기술연구원); 윤덕근(한국건설기술연구원)"
] | PURPOSES: This study prioritizes potential technology for establishing a safe work zone environment on roadways. We consider almost all conceivable technologies that enable mitigation of unexpected accidents for both road workers and drivers.
METHODS: This study suggests a methodology to set the priority of potential technology for establishing a safe work zone environment by using the analytical hierarchy process (AHP). For this purpose, the AHP structure was first developed. Thereafter, a web-based survey was conducted to collect experts’opinions. Based on the survey results, weights associated with the relevant criteria of the developed structure were estimated. With the consistency index (CI) and consistency ratio (CR), we verified the estimated weights. In addition, a sensitivity analysis was performed to confirm whether the estimated weights were reliable. We finally proposed the priority for potential technology for establishing a safe work zone environment on roadways.
RESULTS: In the first level, safety technology has the highest priority, and real-time information delivery for work zone, hazard warning for drivers, and temporal automated operation for traffic facilities were selected in the second level of hierarchy.
CONCLUSIONS : The results imply that establishing the priority will be useful to establish a future road map for improving the work environment for road workers and drivers by employing appropriate protection facilities and developing safety systems. | 토목공학 | null | kci_detailed_000164.xml | |||
ART002055712 | oai_dc | 터널천단변위와 암석 또는 암반의 일축압축강도를 이용한 시공 중인터널의 예비 안정성 평가 | The Pre-Evaluation of Stability during Tunnel Excavation using Unconfined Compression Strength of Intact Rock or Rock Mass and Crown Settlement Data | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"박영화(태현엔지니어링); 문홍득(경남과학기술대학교); 하만복(경상대학교)"
] | PURPOSES: It is difficult to estimate tunnel stability because of lack of timely information during tunnel excavation. Tunnel deformability refers to the capacity of rock to strain under applied loads or unloads during tunnel excavation. This study was conducted to analyze a methods of pre-evaluation of stability during tunnel construction using the critical strain concept, which is applied to the results of tunnel settlement data and unconfined compression strength of intact rock or rock mass at the tunnel construction site.
METHODS: Based on the critical strain concept, the pre-evaluation of stability of a tunnel was performed in the Daegu region, at a tunnel through andesite and granite rock. The critical strain concept is a method of predicting tunnel behavior from tunnel crown settlement data using the critical strain chart that is obtained from the relationship between strain and the unconfined compression strength of intact rock in a laboratory.
RESULTS: In a pre-evaluation of stability of a tunnel, only actually measured crown settlement data is plotted on the lower position of the critical strain chart, to be compared with the total displacement of crown settlement, including precedent settlement and displacement data from before the settlement measurement. However, both cases show almost the same tunnel behavior. In an evaluation using rock mass instead of intact rock, the data for the rock mass strength is plotted on the lower portion of the critical strain chart, as a way to compare to the data for intact rock strength.
CONCLUSIONS : From the results of the pre-evaluation of stability of the tunnel using the critical strain chart, we reaffirmed that it is possible to promptly evaluate the stability of a tunnel under construction. Moreover, this research shows that a safety evaluation using the actual instrumented crown settlement data with the unconfined compression strength of intact rock, rather than with the unconfined compression strength of a rock mass in the tunnel working face, is more conservative. | 토목공학 | null | kci_detailed_000164.xml | |||
ART002055713 | oai_dc | 차량 이동궤적 기반 버스정차대 기하구조 연구 | Geometric Design of Bus Bay Based on Vehicle Trajectory Analysis | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김용석(한국건설기술연구원); 이석기(한국건설기술연구원)"
] | PURPOSES: It is desirable for buses to be parallel to the face of the bus shelter at a bus stop. In this way, passengers can safely use the buses without moving into the vehicle area. The study was a review of the current bus bay geometric guidelines, to determine whether they lead buses to stop parallel to the face of the bus shelter by analyzing vehicle trajectory.
METHODS : A commercial software program for vehicle trajectory analysis was used under our assumptions about bus dimensions and geometric values. The final position of the bus was analyzed for multiple trajectory simulations, reflecting various geometric alternatives.
RESULTS: Within the scope of the study, we concluded that the current design guidelines need to be revised by the design values suggested by the study.
CONCLUSIONS : The results of the study suggested alternative design values for bus bay geometry, based on the assumption that buses should be parallel to the face of the bus shelter in order to prevent passengers from moving into the vehicle area. | 토목공학 | null | kci_detailed_000164.xml | |||
ART002055715 | oai_dc | 콘크리트 모듈러 도로 축하중 거동 분석을 통한 설계 타당성 검증 | Design Validation through Analysis of Concrete Modular Road Behavior under Static Axial Loads | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"남정희(한국건설기술연구원); 김우석(충남대학교); 김기현(한국건설기술연구원); 김연복(한국건설기술연구원)"
] | PURPOSES: The purpose of this study is to validate the design criteria of the concrete modular road system, which is a new semi-bridgetype concept road, through a comparison of numerical analysis results and actual loading test results under static axial loads.
METHODS : To design the semi-bridge-type modular road, both the bridge design code and the concrete structural design code were adopted. The standard truck load (KL-510) was applied as the major traffic vehicle for the design loading condition. The dimension of the modular slab was designed in consideration of self-weight, axial load, environmental load, and combined loads, with ultimate limit state coefficients. The ANSYS APDL (2010) program was used for case studies of center and edge loading, and the analysis results were compared with the actual mock-up test results.
RESULTS : A full-scale mock-up test was successfully conducted. The maximum longitudinal steel strains were measured as about 35 and 83.5 micro-strain (within elastic range) at center and edge loading locations, respectively, under a 100 kN dual- wheel loading condition by accelerating pavement tester.
CONCLUSIONS: Based on the results of the comparison between the numerical analysis and the full-scale test, the maximum converted stress range at the edge location is 32~51% of the required standard flexural strength under the two times over-weight loading condition. In the case of edge loading, the maximum converted stresses from the Westergaard equation, the ANSYS APDL analysis, and the mock-up test are 1.95, 1.7, and 2.3 times of that of the center loading case, respectively. The primary reason for this difference is related to the assumption of the boundary conditions of the vertical connection between the slab module and the crossbeam module. Even though more research is required to fully define the boundary conditions, the proposed design criteria for the concrete modular road finally seems to be reasonable. | 토목공학 | null | kci_detailed_000164.xml | |||
ART002055725 | oai_dc | 도로전광표지를 이용한 국도우회정보 제공이 고속도로 운영에 미치는 효과 분석 -영동고속도로를 중심으로- | Analysis of the Effectiveness of Providing National Highway Detour Information via Variable Message Signs on Expressway Operations - Case of Yeongdong Expressway - | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"양선필(한국도로공사); 최윤택(한국도로공사); 이강훈(한국도로공사); 한음(아주대학교); 윤일수(아주대학교)"
] | PURPOSES : Expressways experience chronic and recurring congestion, especially during weekends and holidays, because of the increased demands for leisure-related travel. The alternatives to solve chronic and recurring congestion may be three-fold: (1) physical expansion of expressway capacities, (2) road pricing, and (3) temporal and spatial distribution of traffic demands. Among these, the third alternative may be the most cost-effective method for the Korea Expressway Corporation (KEC) that can be achieved by using the existing ITS infrastructure.
METHODS : KEC initiated a pilot study in which the traffic on congested expressways was managed by providing traffic condition information (i.e., travel times) of neighboring national highways for taking detours via variable message signs (VMS). This study aimed to estimate the detour rate, and the two pilot studies on Seohaean and Yeongdong expressways yielded many benefits.
RESULTS: It was revealed that the total length of congestion segments decreased by 7.8 km, and the average travel speed increased by 5.3 km/h.
CONCLUSIONS: Based on these findings, it was concluded that the propagation of detour information via VMSs during congestion hours can help reduce congestion on expressways and increase the benefits of the entire network. | 토목공학 | null | kci_detailed_000164.xml | |||
ART002055718 | oai_dc | Laboratory Performance Evaluation of Recycled Asphalt Binders with Differing Rejuvenators | Laboratory Performance Evaluation of Recycled Asphalt Binders with Differing Rejuvenators | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김영민(한국건설기술연구원 도로시설연구실); 임정혁(한국건설기술연구원); 황성도(한국건설기술연구원); 정규동(한국건설기술연구원 도로시설연구실); 이석근(경희대학교)"
] | PURPOSES: The objective of this study is to investigate the properties of recycled asphalt binders with five different rejuvenators, in order to evaluate the applicability of the recycled asphalt binders compared with the original asphalt binder.
METHODS: In order to simulate recycled asphalt binders, fresh asphalt binders are aged by various Superpave aging procedures, such as the rolling thin-film oven (RTFO) and the pressure aging vessel (PAV). Then, selected rejuvenators are added to the aged asphalt binders in the amount of 5%, 10%, and 15%. The asphalt binder properties are evaluated by the dynamic shear rheometer (DSR), the rotational viscometer (RV), and the bending beam rheometer (BBR). In this study, AP-5 (penetration grade 60-80, PG 64-16) asphalt binder is used. A total of five types of rejuvenators are employed.
RESULTS AND CONCLUSIONS : When considering aged asphalt without a new asphalt binder, it seems that the percentage of rejuvenator used in Korea is a bit too low, and that it fails to possess the characteristics of the original binder. From the current practice of evaluating the properties of recycled binder based on penetration ratio only, the amount of rejuvenator required is similar for the long-term-aged binder, but is excessive for the longest-term aged binder, causing deterioration of workability and stiffness of the recycled binder. | 토목공학 | null | kci_detailed_000164.xml | |||
ART002055704 | oai_dc | 지표투과레이더와 적외선카메라를 이용한 아스팔트 포장 시공 관리 방법 | Construction Management Method for Asphalt Paving Using Ground Penetrating Radar and an Infrared Camera | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"백종은(서울시 품질시험소 도로포장연구센터); 박희문(한국건설기술연구원); 유평준(한국건설기술연구원); 임재규(한국건설기술연구원)"
] | PURPOSES : The objective of this study is to propose a quality control and quality assurance method for use during asphalt pavement construction using non-destructive methods, such as ground penetrating radar (GPR) and an infrared (IR) camera.
METHODS: A 1.0 GHz air-coupled GPR system was used to measure the thickness and in situ density of asphalt concrete overlay during the placement and compaction of the asphalt layer in two test construction sections. The in situ density of the asphalt layer was estimated based on the dielectric constant of the asphalt concrete, which was measured as the ratio of the amplitude of the surface reflection of the asphalt mat to that of a metal plate. In addition, an IR camera was used to monitor the surface temperature of the asphalt mat to ensure its uniformity, for both conventional asphalt concrete and fiber-reinforced asphalt (FRA) concrete.
RESULTS: From the GPR test, the measured in situ air void of the asphalt concrete overlay gradually decreased from 12.6% at placement to 8.1% after five roller passes for conventional asphalt concrete, and from 10.7% to 5.9% for the FRA concrete. The thickness of the asphalt concrete overlay was reduced from 7.0 cm to 6.0 cm for the conventional material, and from 9.2 cm to 6.4 cm for the FRA concrete. From the IR camera measurements, the temperature differences in the asphalt mat ranged from 10℃ to 30 ℃ in the two test sections.
CONCLUSIONS: During asphalt concrete construction, GPR and IR tests can be applicable for monitoring the changes in in situ density, thickness, and temperature differences of the overlay, which are the most important factors for quality control. For easier and more reliable quality control of asphalt overlay construction, it is better to use the thickness measurement from the GPR. | 토목공학 | null | kci_detailed_000164.xml | |||
ART002079198 | oai_dc | 고속도로 통행차량 통계 분석을 통한 단독차량의 활하중 효과 추정 | Estimation of Live Load Effect of Single Truck Through Probabilistic Analysis of Truck Traffic on Expressway | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"윤태용(코비코리아); 안상섭(한국도로공사); 권순민(한국도로공사 도로교통연구원); 백인열(가천대학교)"
] | PURPOSES : This study estimated the load effect of a single heavy truck to develop a live load model for the design and assessment of bridges located on an expressway with a limited truck entry weight.
METHODS: The statistical estimation methods for the live load effect acting on a bridge by a heavy vehicle are reviewed, and applications using the actual measurement data for trucks traveling on an expressway are presented. The weight estimation of a single vehicle and its effect on a bridge are fundamental elements in the construction of a live load model. Two statistical estimation methods for the application of extrapolation in a probabilistic study and an additional estimation method that adopts the extreme value theory are reviewed.
RESULTS : The proposed methods are applied to the traffic data measured on an expressway. All of the estimation methods yield similar results using the data measured when the weight limit has been relatively well observed because of the rigid enforcement of the weight regulation. On the other hand, when the estimations are made using overweight traffic data, the resulting values differ with the estimation method.
CONCLUSIONS: The estimation methods based on the extreme distribution theory and the modified procedure presented in this paper can yield reasonable values for the maximum weight of a single truck, which can be applied in both the design and evaluation of a bridge on an expressway. | 토목공학 | null | kci_detailed_000164.xml | |||
ART002079203 | oai_dc | 콘크리트 포장의 급속 보수를 위한 산화마그네슘계열 단면복구재의 성능에 대한 실험적 연구 | Experimental Study on Performance of MgO-based Patching Materials for Rapid Repair of Concrete Pavement | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이현기(한양대학교); 안기용(한양대학교); 심종성(한양대학교)"
] | PURPOSES: This study aims to develop a repair material that can enhance pavement performance, inducing rapid traffic opening through early strength development and fast setting time by utilizing MgO-based patching materials for repairing road pavements.
METHODS : To consider the applicability of MgO-based patching materials for repairing domestic road pavements, first, strength development and setting time of the materials were evaluated, based on MgO to KH2PO4 ratio, water to binder ratio, and addition ratio of retarder (Borax), by which the optimal mixture ratio of the developed material was obtained. To validate the performance of the developed material as a repair material, the strength(compressive strength and bonding strength) and durability (freezing, thawing, and chloride ion penetration resistance) was checked through testing, and its applicability was evaluated.
RESULTS : The results showed that when an MgO-based patching material was used, the condensation time was reduced by 80%, and the compressive strength was enhanced by approximately 300%, as compared to existing cement-based repair materials. In addition, it was observed that the strength (compressive strength and bonding strength) and durability (freezing and thawing, and chloride ion penetration resistance) showed an excellent performance that satisfied the regulations.
CONCLUSIONS : The results imply that an emergent repair/restoration could be covered by a rapid-hardening cement to meet the traffic limitation (i.e. the traffic restriction is only several hours for repair treatment). Furthermore, MgO-based patching materials can improve bonding strength and durability compared to existing repair materials. | 토목공학 | null | kci_detailed_000164.xml | |||
ART002079204 | oai_dc | Overlay Tester를 이용한 그리드 보강 아스팔트 포장의 반사균열 저항성 평가 | Evaluation of Reflection Cracking Resistance of Grid-Reinforced Asphalt Pavement Using Overlay Tester | {
"journal_name": "한국도로학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"유병수(군산대학교); 서우진(군산대학교); 김조순((주)에스엔건설); 박대욱(군산대학교)"
] | PURPOSES: Reflection cracking has been one of the major causes of distress when asphalt pavement is laid on top of concrete pavement.
This study evaluated the reflection cracking resistance of asphalt mixtures reinforced with asphalt embedded glass fiber and carbon fiber using a Texas Transportation Institute (TTI) overlay tester.
METHODS : Different asphalt mixtures such as polymer-modified mastic asphalt (PSMA) and a dense graded asphalt mixture were reinforced with asphalt-embedded carbon fiber and glass fiber. For comparison purposes, two PSMA asphalt mixtures and one dense graded asphalt mixture were evaluated without fiber reinforcement. Two different overlay test modes, the repeated overlay test (R-OT) and monotonic overlay test (M-OT), were used to evaluate the reflection cracking resistance of asphalt mixtures at 0 ℃. In the R-OT test, the number of repeated load when the specimen failed was obtained. In the M-OT test, the tensile strength at the peak load and tensile strain were obtained.
RESULTS : As expected, the fiber-reinforced asphalt mixture showed a higher reflection cracking resistance than the conventional nonreinforced asphalt mixtures based on the R-OT test and M-OT test. The dense graded asphalt mixture showed the least reflection cracking resistance and less resistance than the PSMA.
CONCLUSIONS: The TTI overlay tester could be used to differentiate the reflection cracking resistance values of asphalt mixtures. Based on the R-OT and M-OT results, the carbon-fiber-reinforced asphalt mixture showed the highest reflection cracking resistance among the nonreinforced asphalt mixtures and glass-fiber-reinforced asphalt mixture. | 토목공학 | null | kci_detailed_000164.xml |
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