| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. CONCRETE DELIVERY & ACCEPTANCE | |||
| A1 | Delivery challan matched with order — grade, quantity, delivery date verified Acceptance: Challan shows: grade (M25/M30), quantity ±2% of ordered volume, date/time of dispatch from plant, batch number, driver signature; cross-checked against order | Cl. 10.1 — Concrete delivery documents shall match purchase order and mix design | OK NC NA HOLD |
| A2 | Transit time from batch plant checked — not exceeding initial setting time Acceptance: Dispatch time and arrival time recorded; transit time ≤90 min for OPC (or per mix design for PPC/PSC), rejected if time exceeded or evidence of partial set observed | Cl. 10.3 — Concrete shall be delivered within initial setting time (~90 min for OPC) | OK NC NA HOLD |
| A3 | Batch plant ticket reviewed — matches approved mix design reference Acceptance: Ticket shows mix design ID (e.g., 'M25-IS10262-Rev01'), W/C ratio, cement type, aggregate type/size, admixtures if any, test certificates referenced, batch number unique | Cl. 10.1 — Batch plant ticket shall reference approved mix design | OK NC NA HOLD |
| A4 | Concrete appearance checked — uniform color, no segregation visible Acceptance: Color uniform throughout truck (no dark streaks or pale patches indicating segregation), consistency uniform (not excessively wet or dry), no bleeding water at bottom of truck | Cl. 13.1 — Concrete shall be uniform in color and consistency on delivery | OK NC NA HOLD |
| A5 | Concrete temperature checked — within acceptable range for placement Acceptance: Temperature 5–30°C (standard), check if ambient <5°C or >30°C; use thermometer inserted into sample; if >30°C, activate hot-weather measures (fog spray, shaded curing) | Cl. 10.3 — Concrete delivery temperature should be appropriate to ambient conditions | |
| A6 | Concrete rejected if delivery time exceeded or defects observed Acceptance: If transit time >90 min, partial set observed, or color/consistency anomalies: reject load immediately, document reason, notify batch plant and design consultant, issue NCR | Cl. 10.3 — Concrete not meeting requirements shall be rejected at plant | |
| B. WORKABILITY & SLUMP TESTING (IS 1199:2018) | |||
| B1 | Slump test performed as per IS 1199 — first truck and every truck thereafter Acceptance: Slump test apparatus per IS standard (cone 300mm H, 200mm top dia, 100mm bottom dia), sample taken from middle 1/3 of truck (not beginning/end), fresh concrete used, test result recorded | IS 1199:2018 — Workability control by slump test; frequency ≥1 per truck or per 5m³ | |
| B2 | Slump value measured and recorded — within specified tolerance (±25mm) Acceptance: Target slump for RCC typically 75–100mm; measured slump within ±25mm (so 50–125mm for 75–100mm target), recorded in mm on site log, measurement taken 2 min after lifting cone | IS 1199:2018 — Slump measurement and acceptance criteria per design specification | |
| B3 | Slump out of range — concrete accepted/rejected decision made Acceptance: If slump <50mm: concrete too stiff, cannot flow, may create voids — reject or add water at site per engineer approval (not recommended); if slump >125mm: concrete too fluid, risk of segregation — reject, notify plant | IS 1199:2018 — Slump outside tolerance indicates workability issue | |
| B4 | Slump test frequency documented — minimum 1 per truck or per 5m³ Acceptance: For 100m³ pour: minimum 20 slump tests (every 5m³); all tests recorded with truck number, time, slump value; tests performed before placing in element | IS 1199:2018 — Continuous workability control throughout pour | |
| B5 | Slump test apparatus cleaned between tests — no concrete residue Acceptance: Apparatus washed and dried after each test, no dried concrete on interior surface (affects reading), cone base and rings not bent or damaged | Clean apparatus ensures accurate slump measurement | |
| C. CUBE SAMPLING & TESTING (IS 516:1959) | |||
| C1 | Cube casting frequency — minimum 1 set per 30m³ or part thereof Acceptance: For 100m³ pour: 4 sets of cubes minimum (at 0, 30, 60, 90m³); for <30m³: 1 set minimum; 3 cubes per set (total 9 cubes) for 7-day and 28-day testing | IS 516:1959 Part 1 Sec 1; Cl. 15.2.2 — Test specimen frequency based on volume | |
| C2 | Cube moulds 150mm used and properly prepared — moulds oiled, marked Acceptance: Moulds internally 150mm ±2mm (verified with steel ruler), oiled inside surface (release agent), mould number/ID marked on outside, stacked on level surface in shade | IS 516:1959 — Cube moulds 150×150×150mm ±2mm with proper surface finish | |
| C3 | Concrete sample collected from middle of truck load — not from start/end Acceptance: Sample taken from middle 1/3 of truck discharge (after ~3 min of flow, before last portion), fresh concrete used (no delay >2 min before casting), sufficient volume for all test specimens | IS 1199:2018 — Sample shall be representative of bulk concrete | |
| C4 | Cube compaction — 3 layers of 25 strokes each using tampering rod Acceptance: Each layer ~50mm thick, tamped with 16mm dia tamping rod, 25 strokes per layer distributed evenly, no voids visible at surface after final layer, level with mould top | IS 516:1959 Sec 1 — Compaction in 3 equal layers by tamping | |
| C5 | Cube identification label — date, time, mix, location, pour element Acceptance: Label on cube mould includes: casting date, casting time, concrete grade (M25), mix design ID, element location (e.g., 'Slab S-01, L-3'), pour sequence number; written in permanent marker on mould side | Proper identification ensures traceability and correlation with element | |
| C6 | Cube moulds stored in shade at site — 24 hours before moving to curing tank Acceptance: Moulds left undisturbed in shade (not in sun or wind), no vibration/disturbance, moist hessian placed over if temperature <5°C, transported to lab after 24±2 hrs using padding to prevent damage | IS 516:1959 — Initial curing at site before water curing | |
| C7 | Cube testing schedule — 7-day and 28-day breaks scheduled and documented Acceptance: Testing dates recorded on site log, 7-day cubes broken at 7±1 days, 28-day cubes broken at 28±2 days, independent lab engagement confirmed, test certificates generated | Cl. 15.2.2 — Testing at 7 days (check 67% strength) and 28 days (check target strength) | |