The Aggregate Crushing Value (ACV) is a crucial test to determine the strength and durability of aggregates used in road construction. It measures the resistance of aggregates to crushing under a gradually applied compressive load.
Standard Test Method
The ACV test is conducted as per IS 2386 (Part 4) – 1963 or BS 812-110:1990.
Procedure Summary
1. A sample of aggregates (passing 12.5mm sieve and retained on 10mm sieve) is filled in a cylindrical mold.
2. A load of 40 tonnes is applied gradually over 10 minutes.
3. The crushed material is sieved through a 2.36mm sieve.
4. The percentage weight of fines passing the sieve gives the ACV.
Acceptable ACV for Roads
– For bituminous (flexible) pavements:
– Base & Sub-base layers: ≤ 30% (preferably ≤ 25%)
– For rigid pavements (concrete roads):
– ≤ 30% for lower layers, ≤ 25% for high-quality concrete
Interpretation
– Lower ACV → Stronger, more durable aggregate → Better road performance.
– Higher ACV .jpg)
Weak aggregate → Prone to crushing under traffic loads.
Factors Affecting ACV
– Rock type (e.g., granite > limestone)
– Aggregate shape & texture
– Moisture content
Would you like details on related tests like Los Angeles Abrasion or Aggregate Impact Value?
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