| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. MTC IDENTIFICATION AND AUTHENTICITY | |||
| A1 | Verify MTC on NABL-accredited lab letterhead with unique report number and signatures Acceptance: NABL logo and accreditation number present; authorized signatory; cert date ≤ 3 months old | Cl. 9 — Record keeping | OK NC NA HOLD |
| A2 | Verify source/quarry and batch identification on MTC matches delivery challan and register Acceptance: Source, batch number, quantity consistent across MTC, challan, gate pass | Cl. 9 — Traceability | OK NC NA HOLD |
| A3 | Verify scope of testing stated on MTC covers required IS 2386 parts Acceptance: Parts 1 (grading), 3 (specific gravity/absorption), 4 (mechanical), 7 (alkali-silica), 8 (petrographic) as relevant | Cl. 9 — Test coverage | OK NC NA HOLD |
| B. GRADING / SIEVE ANALYSIS VERIFICATION | |||
| B1 | Verify sieve analysis (IS 2386 Part 1) reported on MTC for all required sieves Acceptance: Coarse agg: 40/20/10/4.75 mm per Table 7; Fine agg: 10/4.75/2.36/1.18/0.6/0.3/0.15 mm per Table 9 | Table 7 / Table 9 — Grading | OK NC NA HOLD |
| B2 | Verify fine aggregate grading falls within Zone I / II / III / IV limits Acceptance: Percentage passing each sieve matches declared zone envelope per IS 383 Table 9 | Cl. 6.3 — Grading zones | OK NC NA HOLD |
| B3 | Verify Fineness Modulus value and consistency with zone declared Acceptance: Natural sand typically FM 2.2–3.2 depending on zone; MSand typical FM 2.5–3.1 | Cl. 6.3 — FM | OK NC NA HOLD |
| C. PHYSICAL / MECHANICAL PROPERTIES VERIFICATION | |||
| C1 | Verify specific gravity and water absorption values reported on MTC Acceptance: Specific gravity 2.5–2.9; water absorption ≤ 2.0% (coarse) and ≤ 3.0% (fine) typical | Cl. 5 — Physical props | OK NC NA HOLD |
| C2 | Verify bulk density and voids content for coarse aggregate Acceptance: Bulk density 1400–1700 kg/m³; values reported and within normal range | IS 2386 Part 3 | OK NC NA HOLD |
| C3 | Verify Aggregate Impact Value (AIV) and Crushing Value for coarse aggregate Acceptance: AIV ≤ 30% (general), ≤ 45% (wearing surface); Crushing value ≤ 30% (general) | Table 7 — Mechanical | OK NC NA HOLD |
| C4 | Verify Los Angeles Abrasion value (if reported / required) Acceptance: LA Abrasion ≤ 30% (wearing surface); ≤ 50% (non-wearing) typical | Cl. 5 — Abrasion | OK NC NA HOLD |