IS 2386:1963 Part 4 is the Indian Standard (BIS) for methods of test for aggregates for concrete: part 4 mechanical properties. This part of IS 2386 outlines the test methods for evaluating the mechanical properties of concrete aggregates. It provides standard procedures for determining the aggregate crushing value, impact value, ten percent fines value, abrasion value, and polished stone value to ensure suitability for structural and pavement use.
Covers methods for determining mechanical properties like crushing strength, abrasion resistance, and impact value of aggregates.
Aggregate impact, abrasion, crushing values for concrete and pavement aggregates.
| Reference | Value | Clause |
|---|---|---|
| Aggregate Impact Value (AIV) — apparatus | drop hammer 13.5–14 kg, 380 mm fall, 15 blows | Cl. 4.2 |
| AIV — sample size (10 mm × 12.5 mm) | filled cup ≈ 100 mm dia × 50 mm depth | Cl. 4.2.4 |
| AIV — calculation | 100 × (mass < 2.36 mm / total) | Cl. 4.4 |
| AIV — limit (concrete aggregate) | ≤ 30 % | (IS 383) |
| AIV — limit (wearing course) | ≤ 30 % | (IRC 58) |
| AIV — limit (non-wearing layer) | ≤ 45 % | (IRC 37) |
| Aggregate Crushing Value (ACV) — apparatus | 150 mm cylinder, plunger compression | Cl. 7.2 |
| ACV — load applied | 40 t over 10 minutes | Cl. 7.4 |
| ACV — calculation | 100 × (mass < 2.36 mm / 4 kg) | Cl. 7.5 |
| ACV — limit (concrete aggregate) | ≤ 30 % | (IS 383) |
| ACV — limit (wearing course) | ≤ 30 % | (IRC 58) |
| Los Angeles Abrasion Value (LAAV) — apparatus | rotating drum + steel charges | Cl. 8.2 |
| LAAV — sample mass | 5 kg ± 25 g (Grading A) | Cl. 8.4 |
| LAAV — number of charges (Grading A) | 12 steel balls | Cl. 8.2.1 (Table 4) |
| LAAV — number of revolutions | 500 (or 1000 for Grading E/F) | Cl. 8.4.3 |
| LAAV — limit (concrete aggregate) | ≤ 30 % | (IS 383) |
| LAAV — limit (bituminous wearing course) | ≤ 30 % | (IRC 37) |
| Soundness — Na₂SO₄ test cycles | 5 cycles immersion + drying | Cl. 6.5 |
| Soundness — Na₂SO₄ loss limit (concrete) | ≤ 12 % | (IS 383) |
| Soundness — MgSO₄ loss limit (concrete) | ≤ 18 % | (IS 383) |
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Standard Sieve Series (Coarse) | 80, 63, 40, 20, 10, 4.75 mm | 75 (3"), 50 (2"), 37.5 (1.5"), 25 (1"), 19 (3/4"), 9.5 (3/8"), 4.75 mm (No. 4) | ASTM C136 / C136M |
| Flakiness Criterion | Thickness < 0.6 × mean sieve size | Particles passing through slots of a bar sieve with opening D/2 (where D is sieve size) | BS EN 933-3 |
| Elongation Criterion | Length > 1.8 × mean sieve size | Ratio of length to width > specified value (e.g., 3:1); value is not fixed by the standard. | ASTM D4791 |
| Separator for Fine/Coarse Aggregate | 4.75 mm IS Sieve | 4.75 mm (No. 4) Sieve | ASTM C136 / C136M |
| Sieving Time (Mechanical Shaker) | Not less than 2 minutes. Sieving is complete when no more than 1% of residue passes a sieve in 1 minute. | No specific time, but sieving is complete when no more than 0.5% by mass of the total sample passes any sieve during 1 minute. | ASTM C136 / C136M |
| Shape Test Apparatus | Thickness Gauge (for flakiness) and Length Gauge (for elongation). | Proportional Caliper Device. | ASTM D4791 |
| Basis of Calculation (Shape) | Index is the mass of flaky/elongated particles as a percentage of the total mass tested. | Percentage by mass or by particle count of particles exceeding a specified dimensional ratio. | ASTM D4791 |