| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. MTC IDENTIFICATION AND AUTHENTICITY | |||
| A1 | Verify MTC bears manufacturer letterhead, unique certificate number, and authorized signature/seal Acceptance: Letterhead present; certificate number unique; QA manager signature and company seal affixed | Cl. 14 — Marking and certification | OK NC NA HOLD |
| A2 | Verify BIS licence number (CM/L) and ISI mark printed on MTC and bags Acceptance: Valid CM/L number; ISI mark legible on bag; licence valid on date of dispatch | Cl. 14 — BIS marking | OK NC NA HOLD |
| A3 | Verify batch/lot number on MTC matches bag markings and delivery challan Acceptance: Batch number matches across MTC, bag, challan, and gate pass; no tampering evident | Cl. 14 — Batch traceability | OK NC NA HOLD |
| A4 | Verify date of manufacture on MTC; cement not older than 3 months at receipt Acceptance: Manufacture date <90 days from receipt; if older, additional strength test mandatory | Cl. 4.2 — Storage/age limit | OK NC NA HOLD |
| B. CHEMICAL COMPOSITION VERIFICATION | |||
| B1 | Verify Lime Saturation Factor (LSF) reported on MTC within specification Acceptance: LSF: 0.80–1.02 for OPC 43/53; reported value within range | Table 1 — Chemical requirements | OK NC NA HOLD |
| B2 | Verify Magnesia (MgO) content on MTC Acceptance: MgO ≤ 6.0% by mass for OPC; reported value compliant | Table 1 — MgO limit | OK NC NA HOLD |
| B3 | Verify Sulphuric anhydride (SO3) content on MTC Acceptance: SO3 ≤ 3.0% (OPC); ≤ 3.5% (PPC); within limit | Table 1 — SO3 limit | OK NC NA HOLD |
| B4 | Verify Insoluble Residue and Loss on Ignition values on MTC Acceptance: IR ≤ 5.0% (OPC), LOI ≤ 5.0%; PPC IR higher due to fly ash — refer IS 1489 | Table 1 — IR & LOI | OK NC NA HOLD |
| B5 | Verify Chloride content on MTC (especially for RCC with prestressing) Acceptance: Cl⁻ ≤ 0.05% for cement; total in concrete ≤ 0.4 kg/m³ (RCC) or 0.1% (prestressed) | Cl. 5.3 — Chloride limit | OK NC NA HOLD |
| C. PHYSICAL / MECHANICAL PROPERTIES VERIFICATION | |||
| C1 | Verify fineness (specific surface by Blaine's method) on MTC Acceptance: Blaine fineness ≥ 225 m²/kg (OPC); ≥ 300 m²/kg (PPC); reported value above minimum | Table 2 — Fineness | OK NC NA HOLD |
| C2 | Verify setting times (initial and final) reported on MTC Acceptance: Initial ≥ 30 min; Final ≤ 600 min (OPC/PPC); within range | Table 2 — Setting times | OK NC NA HOLD |
| C3 | Verify soundness (Le Chatelier expansion / Autoclave) on MTC Acceptance: Le Chatelier ≤ 10 mm; Autoclave expansion ≤ 0.8%; both within limits | Table 2 — Soundness | OK NC NA HOLD |
| C4 | Verify compressive strength at 3, 7, and 28 days reported on MTC Acceptance: OPC 53: 3-d ≥ 27, 7-d ≥ 37, 28-d ≥ 53 MPa; OPC 43: 3-d ≥ 23, 7-d ≥ 33, 28-d ≥ 43 MPa | Table 2 — Compressive strength | OK NC NA HOLD |
| C5 | For PPC — verify fly ash content (15-35%) and drying shrinkage on MTC Acceptance: Fly ash 15-35% by mass; drying shrinkage ≤ 0.15%; compressive strength 28-d ≥ 33 MPa | Cl. 4 — PPC composition | OK NC NA HOLD |