| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. MATERIAL VERIFICATION (IS 1786:2008) | |||
| A1 | Bar grade verified — Fe 500 or Fe 500D per IS 1786 confirmed by MTC Acceptance: MTC present from approved steel mill, grade clearly stated (Fe 500 or 500D), test date <2 years old, lot/batch number matches on-site bars, MTC filed and indexed in project records | Cl. 5.6 — All reinforcement shall have valid MTC certifying grade and properties | |
| A2 | Bar diameter confirmed — all bars match BBS dimensions (±2% manufacturing tolerance) Acceptance: Nominal sizes: 8, 10, 12, 16, 20, 25, 32mm (IS 1786); measure 5 random bars per lot with caliper, diameter within ±2% (e.g., 16mm: 15.68–16.32mm), BBS marked on bars or documented | Cl. 5.6 — Bar diameter critical for strength and development length | |
| A3 | Tensile strength & elongation from MTC — Fe 500 minimum 545 MPa, elongation ≥16% Acceptance: MTC shows tensile test results: Fe 500 ≥545 MPa, yield strength ≥500 MPa, elongation ≥16%, bend-test passed (180° bend no cracking), re-bend test passed (180° bend then 90° straighten no cracking) | IS 1786:2008 — Mechanical properties ensure structural adequacy | |
| A4 | Bend test & re-bend test certification — passed per IS 1786 Acceptance: MTC includes: bend test (180° bend around mandrel, no cracking), re-bend test (bend 180° then straighten 90° then reverse bend 90°, no cracking), test performed on actual lot samples | IS 1786:2008 — Ductility tests ensure bars won't fail in fatigue or seismic loading | |
| A5 | Mill test certificate (MTC) reconciliation — quantity matches delivered bars within 5% Acceptance: MTC weight total matches delivery challan within ±5% (allows for cutting/waste during fabrication), lot number on MTC matched to bar tags/marks, discrepancies documented and escalated | Cl. 5.6 — MTC must match site inventory by grade and diameter | |
| B. CUTTING & BENDING (IS 2502:2012) | |||
| B1 | BBS (Bar Bending Schedule) approved before site cutting — signed by design engineer Acceptance: BBS document present with design engineer approval signature and date, lists all bar marks (e.g., 'A1', 'B2'), cutting length, bending dimension, bending angle, number of each bar type; cross-referenced with structural drawing | Cl. 12.1 — BBS must be approved to ensure correct cutting and bending | |
| B2 | Cutting length verified for straight bars — BBS length vs actual bar length sampled Acceptance: Measure 5 samples of each bar mark with steel tape (at room temperature, not after welding), length within ±20mm of BBS specified length (e.g., BBS 2400mm: accept 2380–2420mm), documented on cutting list | IS 2502:2012 Cl. 2.1 — Cutting length must match design development length | |
| B3 | Bending radius per IS 2502 — minimum 4d for ≤20mm bars, minimum 5d for >20mm Acceptance: For 16mm bar: min 64mm radius (4×16), for 20mm: min 100mm (5×20), for 25mm: min 125mm (5×25); verify by visual inspection (bends should be smooth curves, not kinked), measure bend radius with profile gauge if questioned | IS 2502:2012 Cl. 2.2 — Correct bend radius prevents bar damage and maintains strength | |
| B4 | Hooks on stirrups/ties — 135° angle with 10d extension (or 180° with 4d) Acceptance: Standard 135° hook: extension length ≥10d (for 10mm stirrup: ≥100mm), angle 135°±5°; 180° hook: extension ≥4d (for 10mm: ≥40mm), measured on 5 samples per fabricator batch | IS 2502:2012 Cl. 2.2 — Hook type ensures anchorage within concrete | |
| B5 | No heating used for bending — bars bent cold per IS 2502 Acceptance: No evidence of heat treatment (color change on bar surface = rejection), bending done at ambient temperature using mechanical benders, bar surface smooth and not discolored | IS 2502:2012 Cl. 2.2 — Heating reduces bar strength and ductility | |
| B6 | Bar markings — identity marks visible (paint/stamps/tags) for BBS cross-reference Acceptance: Each bar type marked with BBS mark (e.g., 'A1', 'B2') using paint/stamp/tag, marks legible and not worn off, mark placed at visible location on bar (not buried in bundle) | Cl. 12.1 — Bar marks ensure correct placement per BBS | |
| C. PLACEMENT — BOTTOM STEEL (Cl. 26.3.3, 26.4) | |||
| C1 | Bar spacing — minimum clear spacing verified per code (≥75mm for beams, ≥50mm for slabs) Acceptance: For beams with 20mm agg: min spacing = max(16mm, 30mm, 75mm) = 75mm; measure at 3 locations (start/mid/end of span), use ruler/spacer, no bunching, spacing uniform | Cl. 26.3.3 — Spacing ≥max(dia, 1.5×agg size, 75mm) ensures concrete flow and compaction | |
| C2 | Slab bottom bars — spacing matches drawing, typically 150–200mm c/c Acceptance: Measure bar spacing at grid (e.g., 150mm c/c), measure at 5 locations, spacing uniform ±10mm (e.g., 150±10mm), record on inspection sketch | Cl. 26.3.3 — Slab spacing per design for load distribution | |
| C3 | Beam bottom reinforcement — bar spacing per structural drawing, typically 75–150mm c/c Acceptance: For 2 bars @ 75mm c/c (typical), measure gap between bars: 75±10mm acceptable, check at 3 locations along beam length (support, quarter-span, mid-span), bars at correct height (d-cover) | Cl. 26.3.3 — Beam spacing selected per design moment demand | |
| C4 | Cover blocks installed at 1m spacing — height equal to specified cover requirement Acceptance: Cover block height: for beam with 25mm cover requirement, use 25mm high blocks, block spacing ≤1m along bar length, blocks of mortar type (not plastic for structural concrete), securely tied to bars (wire tie minimum) | Cl. 26.4.2 — Cover blocks maintain concrete cover throughout pour | |
| C5 | Bottom bar placement at correct height — depth to centroid (d) per design Acceptance: For beam with d = 450mm, cover 25mm: bar center at 475mm from bottom (450+25); measure with depth gauge at 3 locations, height ±15mm acceptable, no sagging >20mm | Cl. 26.4 — Correct bar height determines effective depth and moment arm | |
| C6 | Bar alignment — no deviation from plan, measured at multiple points along length Acceptance: String line from end to end: bars within ±20mm of line (for short spans 5m: ±15mm preferred), no kinks or bends introduced by ties, bars securely fixed | Cl. 12.3 — Bars must remain in designed position during construction | |