| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. DESIGN STIPULATIONS (from Specification & IS 456) | |||
| A1 | Target Concrete Grade (fck in MPa) Acceptance: M25 (fck=25) | M30 (fck=30) | M37 (fck=37) | M40 (fck=40) | M45 (fck=45) | M50 (fck=50) | Design compressive strength requirement | OK NC NA HOLD |
| A2 | Exposure Condition Classification Acceptance: Mild | Moderate | Severe | Very Severe | Extreme (affects W/C ratio & cement content) | Environmental exposure category per IS 456 Table 3 | OK NC NA HOLD |
| A3 | Maximum W/C Ratio (from IS 456 Table 5) Acceptance: M25 Mild: 0.60 | M30 Moderate: 0.55 | M40 Severe: 0.45 | M50 Very Severe: 0.40 | Upper limit based on grade & exposure | OK NC NA HOLD |
| A4 | Minimum Cement Content (kg/m³ from IS 456 Table 5) Acceptance: Mild: 300 kg/m³ | Moderate: 330 kg/m³ | Severe: 370 kg/m³ | Very Severe: 415 kg/m³ | Lower limit based on durability & exposure | OK NC NA HOLD |
| A5 | Maximum Cement Content (per IS 456 Cl. 8.2.4.2) Acceptance: 450 kg/m³ (maximum allowable) | Upper limit to avoid excessive heat, shrinkage, cracking | OK NC NA HOLD |
| A6 | Target Mean Strength (fck + 1.65×SD in MPa) Acceptance: Calculate: fck + (1.65 × assumed standard deviation); typical SD = 3-5 MPa | Design mean strength accounting for variability | OK NC NA HOLD |
| A7 | Standard Deviation (SD in MPa) Acceptance: Conservative: 5 MPa | Good control: 4 MPa | Excellent control: 3 MPa | Assumed or historical variability of concrete | OK NC NA HOLD |
| A8 | Workability Requirement Acceptance: Very Low: 25mm | Low: 50mm | Medium: 100mm | High: 150mm | Very High: 175mm | Target slump or workability class | OK NC NA HOLD |
| B. MATERIAL PROPERTIES & SELECTION | |||
| B1 | Cement Type Acceptance: OPC 53 Grade | OPC 43 Grade | PPC (Portland Pozzolana Cement) | Type of Portland cement used | OK NC NA HOLD |
| B2 | Cement Specific Gravity Acceptance: 3.15 typical for OPC; verify with supplier if different | Density of cement solids | OK NC NA HOLD |
| B3 | Fine Aggregate (Sand) Specific Gravity Acceptance: 2.60 to 2.65 typical (test sample for accuracy) | Density of sand solids | OK NC NA HOLD |
| B4 | Coarse Aggregate Specific Gravity Acceptance: 2.60 to 2.70 typical; test actual material | Density of coarse aggregate (20mm/10mm nominal size) | OK NC NA HOLD |
| B5 | Fine Aggregate Water Absorption (%) Acceptance: Typically <2% (natural sand); document actual value | Moisture absorption capacity of sand | OK NC NA HOLD |
| B6 | Coarse Aggregate Water Absorption (%) Acceptance: Typically 0.5-2% (natural stone); document actual | Moisture absorption of coarse aggregate | OK NC NA HOLD |
| B7 | Fine Aggregate Fineness Modulus (FM) Acceptance: Zone I (FM: 2.90-3.09) | Zone II (FM: 3.10-3.71) | Zone III (FM: 3.72-4.51) | Grading/fineness of sand | OK NC NA HOLD |
| B8 | Coarse Aggregate Grading Zone Acceptance: 10mm nominal | 20mm nominal | 40mm nominal (select based on structural requirement) | Size category of coarse aggregate | OK NC NA HOLD |
| B9 | Maximum Nominal Size Aggregate (mm) Acceptance: 10mm | 20mm | 40mm (smaller sizes for thin sections; larger for mass concrete) | Largest aggregate size in mix | OK NC NA HOLD |
| B10 | Aggregate Free Moisture Content (%) Acceptance: Measure for batch adjustments; typical 0.5-3% | Surface moisture on aggregate at batching | OK NC NA HOLD |
| C. MIX DESIGN CALCULATIONS (IS 10262 Method) | |||
| C1 | Water Content (l/m³ from IS 10262 Table 2) Acceptance: Based on workability & aggregate size (e.g., 100-200 l/m³ typical) | Design water-to-concrete volume ratio | OK NC NA HOLD |
| C2 | W/C Ratio Determination Acceptance: Satisfy both: strength requirement AND maximum W/C from IS 456 Table 5 | Select W/C based on target strength and exposure | OK NC NA HOLD |
| C3 | Cement Content Calculation (kg/m³) Acceptance: Result must satisfy: min cement ≤ Calculated ≤ max cement (450 kg/m³) | Calculate: Cement = Water content / W/C ratio | OK NC NA HOLD |
| C4 | Coarse Aggregate Volume (from IS 10262 Table 3) Acceptance: Based on: FM of sand, max size aggregate, W/C ratio (e.g., 0.60-0.75 m³/m³) | Volume of coarse aggregate per m³ concrete | OK NC NA HOLD |
| C5 | Coarse Aggregate Mass (kg/m³) Acceptance: Typical: 1100-1300 kg/m³ | Convert volume to mass: Volume × Specific Gravity × 1000 | OK NC NA HOLD |
| C6 | Fine Aggregate Content (by Absolute Volume Method) Acceptance: Volume = 1 - (Cement/3.15 + Water/1.0 + Coarse Agg/SG_coarse) m³ | Calculate remaining volume for sand | OK NC NA HOLD |
| C7 | Fine Aggregate Mass (kg/m³) Acceptance: Typical: 600-800 kg/m³ | Convert sand volume to mass | OK NC NA HOLD |
| C8 | Admixture Type & Dosage (if used) Acceptance: Type (if any) | Dosage in mL/kg of cement | Supplier specification | Plasticizer, air-entrainment, or other chemical admixture | OK NC NA HOLD |