| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. SAMPLE DETAILS | |||
| A1 | Sample identification and documentation Acceptance: Sample ID legible; depth ≥0.5m below surface or as specified | Sample ID recorded; location and depth clearly marked | OK NC NA HOLD |
| A2 | Soil description per IS 1498 Acceptance: Classification consistent with sieve analysis & plasticity data | Soil type, color, texture, organic matter assessed | OK NC NA HOLD |
| A3 | Natural moisture content determination Acceptance: Value recorded; accuracy ±0.5% over 100°C-105°C for 24 hrs | Moisture content measured at time of sampling | OK NC NA HOLD |
| A4 | Preparation method — air-dried/sieve passing Acceptance: Clods broken; passing sieve size verified; material homogeneous | Soil prepared per IS 2720 Part 7/8 Clause 4.2: either air-dried at room temperature or passing 4.75 mm sieve for standard; passing 19 mm sieve for modified | OK NC NA HOLD |
| B. TEST EQUIPMENT & PARAMETERS | |||
| B1 | Mould specification Acceptance: Volume verified ±10 cm³; no damage; collar height ≥25 mm above mould | Mould volume: 1000 cm³ for Standard Proctor; 2250 cm³ for Modified Proctor. Mould diameter checked; collar present; base plate clean & dry | OK NC NA HOLD |
| B2 | Rammer weight and drop height Acceptance: Weight verified ±25 g; drop height checked within ±10 mm; release smooth & consistent | Standard: 2.6 kg rammer, 310 mm drop; Modified: 4.89 kg rammer, 450 mm drop. Drop height mechanism calibrated | OK NC NA HOLD |
| B3 | Number of layers and blows per layer Acceptance: Blows counted accurately; layers compacted evenly; no soil escape between collar & mould | Standard: 3 layers × 25 blows per layer (total 75 blows); Modified: 5 layers × 56 blows per layer (total 280 blows) | OK NC NA HOLD |
| B4 | Balance calibration Acceptance: Calibration certificate dated within 12 months; zero error <±0.5 g | Balance accuracy ±0.1 g for weights <200 g; ±1 g for >200 g | OK NC NA HOLD |
| C. TEST RESULTS TABLE | |||
| C1 | Trial data — minimum 5 compaction trials Acceptance: Trials span wet and dry of optimum; data points clearly recorded in table | Each trial at different moisture content to establish bell curve; moisture range spanning optimum | OK NC NA HOLD |
| C2 | Moisture content added (%) Acceptance: Increments uniform; water sprayed & mixed before compaction | Increments: typically 2-3% increments (dry→wet); recorded for each trial | OK NC NA HOLD |
| C3 | Weights recorded Acceptance: Weights recorded to ±1 g; moisture content by oven-dry method (IS 2720 Part 2); sample from middle of compacted layer | For each trial: (a) Wet weight of soil + mould (g); (b) Weight of mould alone (g); (c) Moisture content sample from compacted soil (%) | OK NC NA HOLD |
| C4 | Calculation: Wet Soil Weight Acceptance: Calculated correctly for all trials | Wet soil weight = (Wet soil + mould) − (Mould weight) in grams | OK NC NA HOLD |
| C5 | Calculation: Wet Density (γ_wet) Acceptance: Calculated to 3 decimal places; unit consistent (g/cm³ or kN/m³) | Wet Density (g/cm³) = Wet Soil Weight (g) ÷ Mould Volume (cm³) | OK NC NA HOLD |
| C6 | Calculation: Dry Density (γ_d) Acceptance: Formula applied correctly for all trials; result to 2 decimal places (g/cm³ or kN/m³) | Dry Density = Wet Density ÷ (1 + w), where w = moisture content fraction; OR γ_d = γ_wet × 100 / (100 + moisture %) | OK NC NA HOLD |