| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. SOUNDNESS TEST (Sodium Sulfate Method - IS 2386 Part 5, Cl. 4) | |||
| A1 | Sample prepared: single-sized aggregate fraction, oven-dried at 105-110°C, cooled in desiccator Acceptance: 100g sample prepared; size fraction selected per aggregate type; dry mass recorded | Cl. 3 — Sample preparation | OK NC NA HOLD |
| A2 | Sodium sulfate solution prepared: saturated solution (Na2SO4) at 23°C Acceptance: Specific gravity 1.123-1.138; pH 7-8; clear solution; fresh preparation for each test | Cl. 4.1 — Solution preparation | OK NC NA HOLD |
| A3 | Sample immersed in Na2SO4 solution for 16-18 hours at 20-23°C Acceptance: 16-18 hour soak; temperature 20-23°C ±2°C maintained; sample fully submerged | Cl. 4.2 — Immersion cycle | OK NC NA HOLD |
| A4 | Sample dried in oven at 105-110°C for 2 hours; cooled and weighed after each cycle Acceptance: 2 hour oven drying; cooled in desiccator; mass recorded to 0.1g precision | Cl. 4.3 — Drying cycle | OK NC NA HOLD |
| A5 | Soundness test repeated for 5 cycles; mass loss calculated and compared with limit Acceptance: 5 soak-dry cycles completed; loss after 5 cycles ≤12% for acceptable aggregate | Cl. 4.4 — Multi-cycle testing | OK NC NA HOLD |
| B. ALKALI REACTIVITY TEST (Mortar Bar Method - Optional per IS 2386) | |||
| B1 | Mortar bar specimens prepared per IS 2386 using test aggregate and high-alkali cement Acceptance: 1:2.25 cement:agg ratio; high-alkali cement (>0.8% Na2O equiv); specimens 25×25×285 mm | Cl. 5 — Specimen preparation | OK NC NA HOLD |
| B2 | Specimens cured in moist condition initially; then transferred to alkali environment (NaOH solution) Acceptance: Initial moist curing 24 hours; then immersed in 1N NaOH solution; temperature 38±2°C | Cl. 5.1 — Curing procedure | OK NC NA HOLD |
| B3 | Length change measured at 7, 14, 21, and 28 days using comparator Acceptance: Readings at specific days; expansion measured with precision 0.01%; trend documented | Cl. 5.2 — Measurement | OK NC NA HOLD |
| B4 | Expansion at 14 days assessed: <0.1% = safe; 0.1-0.2% = marginally reactive; >0.2% = reactive Acceptance: Safe aggregate <0.1% expansion at 14 days; reactive aggregates may cause durability issues | Cl. 5.3 — Reactivity classification | OK NC NA HOLD |
| C. CLAY AND FINE SILTS TEST (IS 2386 Part 5, Cl. 3.1) | |||
| C1 | Fine material passing 75 micron sieve determined by washing and sieving Acceptance: Sample washed on 75 micron sieve; fines collected and dried; mass recorded | Cl. 3.1 — Fines determination | OK NC NA HOLD |
| C2 | Clay content and fine silts percentage calculated Acceptance: Coarse agg: ≤3% fines; Fine agg: ≤5% fines acceptable per IS 383; <2% preferred | Cl. 3.1 — Fines content | OK NC NA HOLD |