| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. SURFACE PREPARATION | |||
| A1 | Underlying bituminous layer inspected and approved; age ≥14 days minimum before sealing Acceptance: Layer cured ≥14 days; completion certificate available; no visible traffic damage | Cl. 507 — Layer maturity | OK NC NA HOLD |
| A2 | Surface cleaned by mechanical broom/sweeper to remove all loose material and dust Acceptance: Broom removal of dust, debris; <2% dust coverage visible; documented sweeping log | Cl. 507 — Surface cleaning | OK NC NA HOLD |
| A3 | Any cracks >3mm sealed with crack sealant (bituminous putty/mortar) before dressing Acceptance: Cracks >3mm sealed; sealant flush with surface; cured before bitumen application | Cl. 507 — Crack treatment | OK NC NA HOLD |
| A4 | Potholes or soft spots filled and compacted; surface level with surrounding pavement Acceptance: Repairs with same grade bituminous mix; level within ±5mm; compacted to match surrounding | Cl. 507 — Defect repair | OK NC NA HOLD |
| A5 | Surface moisture content <5%; no standing water visible; dry conditions confirmed Acceptance: Visual confirmation of dry surface; no moisture sheen; applied only in dry weather | Cl. 507 — Moisture control | OK NC NA HOLD |
| B. BITUMEN MATERIAL & GRADE | |||
| B1 | Bitumen grade and type approved; test certificate for penetration, softening point available Acceptance: Grade: MC-30, MC-70, RC-2, or RC-5 (per spec); penetration/softening in range; cert <6 months | Cl. 507 — Material approval | OK NC NA HOLD |
| B2 | Bitumen temperature maintained 80-120°C (MC) or 100-140°C (RC) per grade at application Acceptance: MC: 80-120°C; RC: 100-140°C; verified every 30 min with thermometer; logged hourly | Cl. 507 — Temperature control | OK NC NA HOLD |
| B3 | Bitumen rate of application: 1.5-2.0 kg/m² for single seal; 2.5-3.5 kg/m² for double seal Acceptance: Single: 1.5-2.0 kg/m²; Double: 2.5-3.5 kg/m²; pressure/flow meter calibrated; ±5% tolerance | Cl. 507 — Application rate control | OK NC NA HOLD |
| B4 | Spray bar pressure and nozzle configuration verified before each day of work Acceptance: Pressure: 2-3 bar; nozzles aligned; no spray overlap or gaps >100mm; test spray on dummy surface | Cl. 507 — Equipment setup | OK NC NA HOLD |
| C. CHIPPING AGGREGATE QUALITY | |||
| C1 | Aggregate source approved; grading and Los Angeles Abrasion test available Acceptance: LAA ≤30%; grading within spec; angular particles >90%; test cert <12 months old | Cl. 507 — Material approval | OK NC NA HOLD |
| C2 | Aggregate size (chipping) per specification: 10-14mm for single seal, mixed grades for double seal Acceptance: Single: 10-14mm; Double: 1st coat 10-14mm, 2nd coat 6-10mm; sieve analysis ±5% of spec | Cl. 507 — Aggregate sizing | OK NC NA HOLD |
| C3 | Aggregate clean, dry, and free of dust; moisture content <2% Acceptance: Dust content <3%; moisture <2%; stockpile covered; 24-hour drying if wet | Cl. 507 — Aggregate preparation | OK NC NA HOLD |
| C4 | Flaky and elongated particles <15%; all particles angular for good adhesion Acceptance: E&F <15%; visual confirmation of angular particles; brittle (no coating damage on chipping) | Cl. 507 — Particle shape | OK NC NA HOLD |
| C5 | Aggregate rate of application: 8-10 kg/m² for 10-14mm chipping Acceptance: Single seal: 8-10 kg/m²; measured by hopper scale; ±10% tolerance allowed | Cl. 507 — Application rate | OK NC NA HOLD |