| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. SPECIFIC GRAVITY TEST (IS 2386 Part 3) | |||
| A1 | Sample prepared: oven-dried aggregate cooled in desiccator, weighed (Weight A in air) Acceptance: Sample 500g for fine agg, 1000g for coarse; dried at 105-110°C to constant mass | Cl. 3 — Sample preparation | OK NC NA HOLD |
| A2 | Sample immersed in distilled water for 24 hours; surface-dried and weighed (Weight B in air) Acceptance: SSD (Surface-Saturated-Dry) mass recorded; excess moisture removed with cloth | Cl. 4 — SSD condition | OK NC NA HOLD |
| A3 | Sample suspended in water and weighed (Weight C in water) using pycnometer Acceptance: Pycnometer filled with water and sample; weight recorded to 0.1g; temp noted | Cl. 4.1 — Submerged weight | OK NC NA HOLD |
| A4 | Bulk specific gravity calculated: Weight A / (Weight B - Weight C) measured to 2 decimals Acceptance: Bulk specific gravity typical: 2.60-2.80 for natural aggregates; documented accurately | Cl. 5 — Calculation | OK NC NA HOLD |
| B. WATER ABSORPTION TEST (IS 2386 Part 3) | |||
| B1 | Water absorption calculated: [(Weight B - Weight A) / Weight A] × 100 Acceptance: Absorption % calculated; natural agg typical 0.5-2.0%; fine agg usually higher | Cl. 5.2 — Absorption calculation | OK NC NA HOLD |
| B2 | Absorption value compared with IS 383 limits (maximum 2% for coarse, 3% for fine) Acceptance: Coarse agg: ≤2.0%; Fine agg: ≤3.0%; higher absorption acceptable with justification | Cl. 5.2 — Acceptance criteria | OK NC NA HOLD |
| C. IMPACT VALUE TEST (IS 2386 Part 4 - Coarse Aggregate Only) | |||
| C1 | Sample prepared: single-sized aggregate (10-12 mm or 12-16 mm per type), 3.5 kg mass Acceptance: Sample sieved to specific size range; exactly 3.5 kg prepared; oven-dried | Cl. 3 — Sample size | OK NC NA HOLD |
| C2 | Impact test performed: sample in steel cup, hammered with 13.5 kg weight dropped from 38 cm height Acceptance: 15 blows applied; aggregate crushed; material sieved and mass passing 2.36 mm recorded | Cl. 4 — Test procedure | OK NC NA HOLD |
| C3 | Impact value calculated: (Mass passing 2.36 mm / 3500) × 100; expressed as percentage Acceptance: Impact value typical 10-20% for good quality agg; ≤30% required by IS 383 | Cl. 5 — Value calculation | OK NC NA HOLD |