Update app.py

app.py

@@ -1,55 +1,66 @@
 import streamlit as st
 
 def calculate_mix_design(strength_psi, strength_type, workability, exposure, cement_type):
-    # Convert cube strength to cylinder strength if needed
+    # Convert Cube to Cylinder if required
     if strength_type == "Cube":
         f_c = strength_psi * 0.8
     else:
         f_c = strength_psi
 
-    # Estimate standard deviation (S) = 500 psi for general case
-    f_avg = f_c + 1.34 * 500
-
-    # Determine water-cement ratio (w/c) based on exposure and target strength
+    # Water-Cement Ratio based on Exposure
     if exposure == "Severe":
         w_c_ratio = min(0.45, 0.75 - f_c / 10000)
     elif exposure == "Moderate":
         w_c_ratio = min(0.50, 0.75 - f_c / 10000)
-    else:  # Mild
+    else:
         w_c_ratio = min(0.60, 0.75 - f_c / 10000)
 
-    # Estimate water content (kg/m³) based on workability
+    # Water content (kg/m³) based on Workability
     if workability == "High":
         water_content = 210
     elif workability == "Medium":
         water_content = 185
-    else:  # Low
+    else:
         water_content = 160
 
-    # Calculate cement content (kg/m³)
+    # Cement content
     cement_content = water_content / w_c_ratio
 
-    # Constants
-    volume = 1.0  # m³
+    # Volume constants
     air = 0.02
     sg_cement = 3.15
     sg_agg = 2.65
     sg_water = 1.0
 
-    # Volumes occupied by each material
+    # Volumes of materials
     cement_vol = cement_content / (sg_cement * 1000)
     water_vol = water_content / (sg_water * 1000)
-    air_vol = air
-    agg_vol = volume - (cement_vol + water_vol + air_vol)
+    agg_vol = 1.0 - (cement_vol + water_vol + air)
 
-    # Split aggregates: 60% coarse, 40% fine
+    # Split aggregates
     coarse_agg = agg_vol * sg_agg * 1000 * 0.6
     fine_agg = agg_vol * sg_agg * 1000 * 0.4
 
-    # Approximate mix ratio by weight
+    # Material Densities for Volume Ratio (kg/m³)
+    density_cement = 1440
+    density_fine = 1600
+    density_coarse = 1500
+
+    # Convert to volume (m³)
+    vol_cement = cement_content / density_cement
+    vol_fine = fine_agg / density_fine
+    vol_coarse = coarse_agg / density_coarse
+
+    # Normalize volumes to 1 part cement
     ratio_cement = 1
-    ratio_fine = round(fine_agg / cement_content, 1)
-    ratio_coarse = round(coarse_agg / cement_content, 1)
+    ratio_fine = vol_fine / vol_cement
+    ratio_coarse = vol_coarse / vol_cement
+
+    # Round to nearest 0.5
+    def round_half(x):
+        return round(x * 2) / 2
+
+    mix_ratio_volume = f"1 : {round_half(ratio_fine)} : {round_half(ratio_coarse)}"
 
     slump_range = {
         "Low": "25-50 mm",
@@ -57,7 +68,6 @@ def calculate_mix_design(strength_psi, strength_type, workability, exposure, cem
         "High": "125-150 mm"
     }[workability]
 
-    # Admixture recommendations
     admixtures = []
     if exposure in ["Moderate", "Severe"]:
         admixtures.append("Retarder")
@@ -67,13 +77,12 @@ def calculate_mix_design(strength_psi, strength_type, workability, exposure, cem
         admixtures.append("Fly Ash")
 
     return {
+        "Required Strength (PSI)": strength_psi,
         "Exposure Condition": exposure,
         "Cement Type": cement_type,
-        "Adjusted Strength for Design (f'c)": round(f_c),
-        "Target Mean Strength (f_avg)": round(f_avg),
         "Water-Cement Ratio": round(w_c_ratio, 3),
         "Slump Range": slump_range,
-        "Mix Ratio (by weight)": f"1 : {ratio_fine} : {ratio_coarse}",
+        "Mix Ratio (by volume)": mix_ratio_volume,
         "Cement (kg/m³)": round(cement_content),
         "Water (kg/m³)": round(water_content),
         "Fine Aggregate (kg/m³)": round(fine_agg),
@@ -81,19 +90,19 @@ def calculate_mix_design(strength_psi, strength_type, workability, exposure, cem
         "Recommended Admixtures": ", ".join(admixtures) if admixtures else "None"
     }
 
-# Streamlit UI
+# Streamlit App Interface
 st.set_page_config(page_title="Concrete Mix Design Assistant (ACI/ASTM)")
 st.title("🧱 Concrete Mix Design Assistant")
 st.subheader("Based on ACI 211.1 & ASTM Standards")
 
-# Inputs
+# User Inputs
 strength = st.number_input("Required Concrete Strength (PSI)", min_value=1000, max_value=10000, step=100, value=4000)
 strength_type = st.selectbox("Strength Type", ["Cube", "Cylinder"])
 workability = st.selectbox("Workability", ["Low", "Medium", "High"])
 exposure = st.selectbox("Exposure Condition", ["Mild", "Moderate", "Severe"])
 cement_type = st.selectbox("Type of Cement", ["OPC", "SRC", "PPC"])
 
-# Run design
+# Output
 if st.button("Generate Mix Design"):
     results = calculate_mix_design(strength, strength_type, workability, exposure, cement_type)
     st.success("ACI/ASTM Mix Design Calculated Successfully!")