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Aggregate Impact Value Test

Aim: To conduct a test to determine aggregate impact value of coarse
aggregate.

Note: Aggregate Impact Value gives a relative measure of the resistance
of an aggregate to a sudden shock or impact which differs from
crushing strength.

IS: 2386 Part IV.

Apparatus:

Impact Testing Machine, Tamping Rod, Sieves 12.5mm, 10mm and
2.36mm

Procedure:

-Take some coarse aggregate passing through 12.5mm sieve and
retained on 10mm sieve, wash and oven dry for 4 hours.

-Take the wt. of empty cup. Put this in the cup in three layers while
tamping 25 times.

- Weigh the aggregate with cup. Now fill the cup to the brim and
further give 15 blows.

- Take a 2.36mm sieve and pass the impacted aggregate Note B and A
values.

Calculation: Aggregate Impact Value= B x 100 /A

B= Fraction Passing

A= Fraction Retained

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Aggregate impact value test

  • 1. Aggregate Impact Value Test Aim: To conduct a test to determine aggregate impact value of coarse aggregate. Note: Aggregate Impact Value gives a relative measure of the resistance of an aggregate to a sudden shock or impact which differs from crushing strength. IS: 2386 Part IV. Apparatus: Impact Testing Machine, Tamping Rod, Sieves 12.5mm, 10mm and 2.36mm Procedure: -Take some coarse aggregate passing through 12.5mm sieve and retained on 10mm sieve, wash and oven dry for 4 hours. -Take the wt. of empty cup. Put this in the cup in three layers while tamping 25 times. - Weigh the aggregate with cup. Now fill the cup to the brim and further give 15 blows. - Take a 2.36mm sieve and pass the impacted aggregate Note B and A values. Calculation: Aggregate Impact Value= B x 100 /A B= Fraction Passing A= Fraction Retained