| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. AGGREGATE MATERIAL QUALITY | |||
| A1 | Aggregate source approved; quarry documentation and test certificates available Acceptance: Source test report dated <12 months; all test parameters within spec | Cl. 401 — Material approval | OK NC NA HOLD |
| A2 | Coarse aggregate Los Angeles Abrasion (LAA) value ≤ 40% Acceptance: LAA ≤ 40% for WBM/WMM; tested per IS 2386 Part IV; 1 test per 1000 tonnes | Cl. 401 — Durability requirement | OK NC NA HOLD |
| A3 | Impact value of coarse aggregate ≤ 30% (for WBM) Acceptance: Impact value ≤ 30% for WBM; measured per IS 2386 Part IV | Cl. 401 — Strength requirement | OK NC NA HOLD |
| A4 | Aggregate grading complies with specification (sieve analysis results) Acceptance: Sieve analysis within ±5% of spec limits for each sieve; 1 test per 500 tonnes | Cl. 401 — Grading compliance | OK NC NA HOLD |
| A5 | Fines material (<75 micron) ≤ 10% for WBM/WMM; PI of fines 4-9 Acceptance: Fines ≤ 10% by dry weight; PI 4-9 (determined per IS 2720); non-plastic fines acceptable | Cl. 401 — Fines control | OK NC NA HOLD |
| A6 | Elongated & flaky aggregate particles ≤ 25% (for WBM) Acceptance: E&F ≤ 25%; measured per IS 2386 Part I; manual sieving method | Cl. 401 — Shape control | OK NC NA HOLD |
| B. MATERIAL DELIVERY & STOCKPILING | |||
| B1 | Aggregate delivered per approved material schedule; source batch identity maintained Acceptance: Delivery note includes source, date, test cert; segregation by lot maintained | Cl. 401 — Material traceability | OK NC NA HOLD |
| B2 | Stockpiles separated by size fraction; no intermingling of material Acceptance: Clear separation between coarse & fines stockpiles; covered to prevent contamination | Cl. 401 — Segregation control | OK NC NA HOLD |
| B3 | Stockpile surface compacted and protected from surface water infiltration Acceptance: No pooled water; top layer compacted; covered during heavy rain | Cl. 401 — Moisture control | OK NC NA HOLD |
| B4 | Material moisture content ≤ 2% above OMC at time of placement Acceptance: Measured moisture ≤ (OMC + 2%); tested daily or before compaction | Cl. 401 — Moisture at placement | OK NC NA HOLD |
| C. LAYING & SPREADING | |||
| C1 | Subgrade inspected and approved before course material is spread Acceptance: Subgrade approval sign-off available; surface cleaned of debris | Cl. 401 — Prerequisite approval | OK NC NA HOLD |
| C2 | Material spread uniformly in single layer of specified thickness (150-200mm) Acceptance: Layer thickness: 150-200mm ±10mm; measured at 50m intervals; 4-5 cross-sections per km | Cl. 401 — Thickness control | OK NC NA HOLD |
| C3 | Spreader equipment maintains uniform depth across full width; roller behind spreader Acceptance: Spreader hopper empty before reversing; no segregation visible at edges | Cl. 401 — Equipment efficiency | OK NC NA HOLD |
| C4 | Material bond breaker (dry stone dust or sand) applied if required for WMM/GSB Acceptance: Sand/dust layer 3-5mm; uniform distribution; prevents bonding to subgrade | Cl. 401 — Interface treatment | OK NC NA HOLD |