Pavement Quality Concrete (PQC) is a rigid pavement layer designed to directly transfer traffic loads to the subgrade through slab action. It is widely used in National Highways for long service life (30–40 years).
| Test | Standard | Frequency | Requirement |
|---|---|---|---|
| Normal Consistency | IS 4031 | Each batch | As per IS 12269 / IS 8112 / IS 1489 |
| Initial & Final Setting Time | IS 4031 | Each batch | Initial ≥ 30 min, Final ≤ 600 min |
| Soundness | IS 4031 | Each batch | Max 10 mm |
| Compressive Strength | IS 4031 | Each batch | 28-day strength as per grade |
| Chemical Test | IS 4031 | Every 6 months | As per IS codes |
| Test | Standard | Frequency | Requirement |
|---|---|---|---|
| pH Value | IS 3025 | Every 3 months | ≥ 6 |
| Organic Impurities | IS 3025 | Every 3 months | Max 200 mg/l |
| Inorganic | IS 3025 | Every 3 months | Max 3000 mg/l |
| Sulphate | IS 3025 | Every 3 months | Max 400 mg/l |
| Chlorides | IS 3025 | Every 3 months | Max 500 mg/l |
| Suspended Matter | IS 3025 | Every 3 months | Max 2000 mg/l |
| Test | Standard | Frequency | Requirement |
|---|---|---|---|
| Sieve Analysis | IS 383 / IS 2386 | 1/day | As per grading table |
| Aggregate Impact | IS 2386 | 1/week | Max 45% (30% for wearing surface) |
| Los Angeles Abrasion | IS 2386 | As required | Max 35% |
| Alkali Reactivity | IS 2386 | Once/source | Innocuous |
| Soundness | IS 2386 | Once/source | 12% Na₂SO₄ / 18% MgSO₄ |
| Flakiness & Elongation | IS 2386 | Weekly | Max 35% |
| Water Absorption | IS 2386 | Once/source | Max 2% |
| Test | Standard | Frequency | Requirement |
|---|---|---|---|
| Sieve Analysis | IS 383 | Daily | As per Zone I/II/III |
| Silt Content | IS 2386 | Daily | Max 3% |
| Fineness Modulus | IS 383 | Daily | 2 – 3.5 |
| Sand Equivalent | IS 2386 | Once/source | ≥ 50% |
| Test | Standard | Frequency | Requirement |
|---|---|---|---|
| Slump Test | IS 1199 | Each transit mix | As per mix design |
| Surface Regularity | IRC SP-16 | As required | 3 mm |
| Surface Level Tolerance | MORTH | Every 10 m | ±5 mm |
| Strength of Concrete | IS 516 | 2 cubes + 2 beams / 150 m³ | As per mix design |