| S.No. | Field / Checkpoint | Reference | Status |
|---|---|---|---|
| A. SAMPLE DETAILS | |||
| A1 | Cube ID (sequential) + cast date + element + grade Acceptance: Cube uniquely identified | Per IS 516 Cl. 5 | OK NC NA |
| A2 | Mould size (150mm cube) + slump on sampling Acceptance: Per code | Per IS 516 | OK NC NA |
| B. CURING + TESTING | |||
| B1 | De-mould (24 hrs) + curing tank entry (27±2°C) Acceptance: Curing temp + duration logged | IS 516 Cl. 7 | OK NC NA |
| B2 | 7-day break — strength (N/mm²) + load (kN) Acceptance: Reading logged | Indicative; not acceptance | OK NC NA |
| B3 | 28-day break — characteristic strength (fck) Acceptance: Reading logged | IS 456 Cl. 15 — acceptance criteria | OK NC NA |
| C. ACCEPTANCE | |||
| C1 | Individual cube ≥ 0.85 fck + 3 MPa (M15-M20) or 0.85 fck + 4 MPa (M25+) Acceptance: Pass / Fail | IS 456 Cl. 16.1 | OK NC NA |
| C2 | Mean of 4 consecutive ≥ fck + 3 (M15-M20) or fck + 4 (M25+) MPa Acceptance: Pass / Fail | IS 456 Cl. 16.1 | OK NC NA |
| C3 | Failure → re-test (rebound / core / load) + NCR Acceptance: NCR raised if needed | IS 456 Cl. 16.3 | OK NC NA |