The Aggregate Crushing Value (ACV) Test is a standard method used to determine the resistance of coarse aggregates to crushing under gradually applied compressive load. In the Philippines, this test is commonly conducted following British Standard (BS 812-110:1990) or ASTM C131/C131M-14 standards, depending on project specifications.
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Purpose of ACV Test
– Measures the hardness and durability of aggregates.
– Helps assess the suitability of aggregates for use in road construction and concrete works.
– Ensures compliance with Philippine construction standards (e.g., DPWH, ASTM, or BS).
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Apparatus Required
1. Steel Cylinder (150 mm internal diameter, height ~130–140 mm)
2. Plunger (flat-faced, 150 mm diameter)
3. Compression Testing Machine (capable of applying 400 kN load)
4. Weighing Balance (accuracy ±0.1 g)
5. IS Sieves (12.5 mm & 10
for grading)
6. Tamping Rod (16 mm diameter, 600 mm length)
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Test Procedure
1. Sample Preparation
– Sieve aggregates through 12.5 mm and retain on 10 mm sieve.
– Fill the steel cylinder in three layers, tamping each layer 25 times.
– Level the surface and weigh (Weight A = Mass of aggregate in cylinder).
2. Compression Test
– Place the plunger on top.
– Apply a gradual load at a rate of 40 kN/min until reaching 400 kN.
– Hold for 10 seconds, then release.
3. Sieve Crushed Material
– Remove crushed aggregate and sieve through a 2.36 mm sieve.
– Weigh the material passing (Weight B = Mass of crushed fines).
4. Calculate ACV (%)
\[
\text{ACV} = \left( \frac{\text{Weight B}}{\text{Weight A}} \right) \times 100
\]
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Acceptable Limits (Philippines)
| Application | Max ACV (%) |
|——————-|————|
| Base Course | ≤30–35% |
| Sub-base | ≤45% |
| Concrete Works | ≤30% |
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