| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. TEST DETAILS & REFERENCE | |||
| A1 | Test location identification Acceptance: Location uniquely identifiable; map/sketch provided if needed; depth of test marked clearly | Location clearly marked: chainage (if linear project), offset (if required), layer/lift number, coordinates (if applicable), ground level elevation | OK NC NA HOLD |
| A2 | Test date & time Acceptance: Date & time legible; weather noted (affects sand density calibration if applicable) | Date & time of test recorded; weather conditions noted (temperature, humidity for sand replacement density) | OK NC NA HOLD |
| A3 | Test method selection & documentation Acceptance: Method appropriate for material type; method clearly documented; apparatus specifications provided | Method chosen: Sand Replacement (IS 2720 Part 28) OR Core Cutter (IS 2720 Part 29). Selection justified: sand replacement for large voids/gravel soils; core cutter for cohesive/fine-grained soils. Method clearly stated in report | OK NC NA HOLD |
| A4 | Reference Proctor test data Acceptance: MDD & OMC clearly stated; units consistent; reference report ID traceable; values match approved source | Reference to laboratory Proctor test (IS 2720 Part 7 or 8): Maximum Dry Density (MDD) in g/cm³ or kN/m³, Optimum Moisture Content (OMC) in %, test type (Standard/Modified). Source Proctor report ID or date documented | OK NC NA HOLD |
| A5 | Target compaction specification Acceptance: Target compaction % stated; moisture acceptance band documented; specification traceable to design/contract | Target compaction % as per design (typically 95% of MDD per IS 1904 Clause 10.4, unless design specifies otherwise); acceptable moisture range = OMC ±2% (or as specified) | OK NC NA HOLD |
| B. SAND REPLACEMENT METHOD (IS 2720 PART 28) | |||
| B1 | Calibrating cylinder preparation Acceptance: Cylinder volume ±10 cm³; sand density consistent with historical calibration; values documented before field test | Calibrating cylinder: volume (cm³) determined per IS 2720 Part 28 Clause 5.1.1 by water displacement (typical 1000 cm³); mass of empty cylinder (g) recorded; sand bulk density (g/cm³) determined by filling cylinder & weighing (typically 1.58−1.68 g/cm³ for Delhi sand) | OK NC NA HOLD |
| B2 | Cone & cylindrical jar calibration Acceptance: Cone mass accurate ±5 g; cone fits snugly in cylinder; no sand leakage from joints; apparatus ready for field deployment | Cone (standard metal cone per IS 2720 Part 28 Clause 5.1.2): fitted to cylinder; mass of cone (g) determined before field test; jar for collecting excavated soil fitted with cone assembly | OK NC NA HOLD |
| B3 | In-situ hole excavation Acceptance: Hole size & depth appropriate; soil collected intact; hole bottom level & firm; side walls not disturbed | Hole excavated at test location using spoon/shovel, slightly deeper than intended depth; hole diameter 75−100 mm; all excavated soil collected in weighed container; hole prepared to receive sand-filled jar & cone assembly per IS 2720 Part 28 Clause 6.1 | OK NC NA HOLD |
| B4 | Sand filling procedure Acceptance: Sand flows freely; hole completely filled without voids; no sand spillage; sand collection complete & accurate | Jar (with cone attached) placed over hole; sand from calibrated cylinder poured into jar until hole filled completely, then cone removed & sand collected in measure. Mass of sand used = (mass sand in cylinder + jar) − (mass jar + cone + sand remaining in jar after cone removal) | OK NC NA HOLD |
| B5 | Sand Replacement calculations Acceptance: All weights recorded accurately; volume calculated correctly; wet density ≥1.4 g/cm³ typical for compacted soil | Calculations: (a) Weight of sand in cone (g) — determined by filling cone in place before field test; (b) Weight of sand in hole = weight of sand used − weight of sand in cone; (c) Volume of hole (cm³) = weight of sand in hole ÷ bulk density of sand; (d) Wet density (g/cm³) = weight of excavated soil ÷ volume of hole | OK NC NA HOLD |
| C. CORE CUTTER METHOD (IS 2720 PART 29) | |||
| C1 | Core cutter apparatus specification Acceptance: Cutter volume verified ±10 cm³; edges sharp & undamaged; calibration certificate available; mass consistent ±2 g | Core cutter per IS 2720 Part 29 Clause 5: cylindrical steel cutter, volume (cm³) = π r² h where r = radius, h = height; typical volume 1000 cm³ (for 100 mm ID × 127 mm height); mass of empty cutter weighed & recorded to ±1 g. Cutter sharp edges, no dents or deformation | OK NC NA HOLD |
| C2 | In-situ core cutter placement Acceptance: Cutter inserted smoothly; soil not displaced around cutter; insertion depth adequate; sample intact without loss | Cutter position marked on compacted soil surface; cutter slowly driven into soil using rammer/driving head per IS 2720 Part 29 Clause 6.1; depth of insertion recorded (typically full height of cutter); cutter twisted/loosened from surrounding soil without loss of sample | OK NC NA HOLD |
| C3 | Core cutter sample collection Acceptance: Sample trimmed neatly; no soil loss; weight recorded; sample height matches cutter height ±5 mm | Cutter removed from hole with sample inside; excess soil trimmed flush with cutter top & bottom edges using straight edge; cutter with soil weighed to ±1 g | OK NC NA HOLD |
| C4 | Core cutter wet density calculation Acceptance: Weight difference calculated correctly; density value >1.4 g/cm³ typical for compacted soil; calculation verified | Wet soil weight (g) = (cutter + soil mass) − (cutter mass); wet density (g/cm³) = wet soil weight ÷ cutter volume | OK NC NA HOLD |