| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. SAMPLE PREPARATION AND WEIGHING | |||
| A1 | Sample prepared per IS 2386: representative aggregate dried in oven at 105-110°C Acceptance: Oven temperature 105-110°C; dried to constant mass; cooled in desiccator before weighing | Cl. 3.1 — Sample preparation | OK NC NA HOLD |
| A2 | Sample mass recorded: 500g minimum for fine aggregate; 2000g for coarse aggregate Acceptance: Fine agg: 500-1000g; Coarse agg: 2000-5000g; mass recorded to 0.1g precision | Cl. 3.1 — Sample size | OK NC NA HOLD |
| A3 | Initial mass of sample recorded and documented Acceptance: Total sample mass documented; used as baseline for sieve retention calculation | Cl. 3.2 — Initial weighing | OK NC NA HOLD |
| B. SIEVE SET PREPARATION AND SHAKING | |||
| B1 | Standard IS sieves used per specification: appropriate for aggregate type and size Acceptance: Fine agg sieves: 4.75, 2.36, 1.18, 600, 300, 150 microns + pan; Coarse: 20, 10, 4.75 mm + pan | Cl. 3.3 — Sieve specification | OK NC NA HOLD |
| B2 | Sieves calibrated and clean; no holes or damaged mesh Acceptance: Sieves certified calibrated; mesh intact; no tears or blockages; cleaned before use | Cl. 3.3 — Sieve condition | OK NC NA HOLD |
| B3 | Sample distributed on top sieve and shaken using mechanical sieve shaker Acceptance: Shaker operated per standard; duration until no more than 1% passes on 2 consecutive minutes | Cl. 3.4 — Shaking procedure | OK NC NA HOLD |
| B4 | Material retained on each sieve collected and weighed to 0.1g precision Acceptance: Each sieve fraction weighed separately; mass recorded for each size; sum reconciles to total | Cl. 3.5 — Mass determination | OK NC NA HOLD |
| C. GRADING ANALYSIS AND CALCULATIONS | |||
| C1 | Percentage retained on each sieve calculated: (Mass on sieve / Total sample mass) × 100 Acceptance: Retention % calculated accurately; decimals to 0.1%; sum of all fractions ≈ 100% | Cl. 4.1 — Percentage calculation | OK NC NA HOLD |
| C2 | Cumulative percentage retained calculated from top sieve downward Acceptance: Running total calculated; cumulative % increases from coarser to finer sieves | Cl. 4.1 — Cumulative retention | OK NC NA HOLD |
| C3 | Percentage passing each sieve calculated: 100% - Cumulative % Retained Acceptance: Passing % calculated for each sieve; decreases from coarser to finer sizes | Cl. 4.1 — Passing percentage | OK NC NA HOLD |
| C4 | Fineness Modulus (FM) calculated for fine aggregate: (Sum of % retained on sieves) / 100 Acceptance: FM calculated; typical range 2.8-3.2 for natural sand; documented with precision to 2 decimals | Cl. 4.2 — FM determination | OK NC NA HOLD |