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Aggregate Crushing Value

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AGGREGATE CRUSHING VALUE
This test helps to determine the aggregate crushing value of coarse aggregates as per IS: 2386 (Part IV) – 1963. The apparatus used is Cylindrical measure and plunger, Compression testing machine, IS Sieves of sizes – 12.5mm, 10mm and 2.36mm

Procedure to determine Aggregate Crushing Value
i) The aggregates passing through 12.5mm and retained on 10mm IS Sieve are oven-dried at a temperature of 100 to 110oC for 3 to 4hrs.

ii) The cylinder of the apparatus is filled in 3 layers, each layer tamped with 25 strokes of a tamping rod.

iii) The weight of aggregates is measured (Weight ‘A’).

iv) The surface of the aggregates is then leveled and the plunger inserted. The apparatus is then placed in the compression testing machine and loaded at a uniform rate so as to achieve 40t load in 10 minutes. After this, the load is released.

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v) The sample is then sieved through a 2.36mm IS Sieve and the fraction passing through the sieve is weighed (Weight ‘B’).

vi) Two tests should be conducted.

Aggregate crushing value = (B/A) x 100%.

cylindrical-measure-plunger-aggregate-crushing

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Comments
  • Ajay surya February 5, 2017 at 2:23 am

    Whether it is preferable if the aggregate crushing value is exactly 30% in construction of cc pavement.

  • Mohammad Adil April 13, 2017 at 2:31 pm

    How is the aggregate crushing value of non standard size aggregate evaluated?

  • Arup Baraman June 27, 2017 at 10:29 am

    What is the range of aggregate crushing value for a good quality aggregate?

  • Akao Samuel July 12, 2017 at 10:30 am

    What is the range of aggregate crushing value for a good quality aggregate?

  • mohsan July 14, 2017 at 8:21 am

    Arup Baraman
    What is the range of aggregate crushing value for a good quality aggregate?

  • Md. Monir Hossain December 29, 2017 at 7:38 am

    what is the rang of coarse aggregate (stone chips) crushing value for a good quality aggregate?

  • Jitendra Kumar mahto April 11, 2018 at 7:22 am

    What is the permissible limit of crushing aggregate

  • Chaure Pranjal October 3, 2019 at 8:40 am

    what variation in the result is expected if the smaller size aggregates are used in aggregate crushing value test

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