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Aggregate Impact Value Test
The aggregate impact value of coarse aggregate provides a relative measure of the resistance of an aggregate to sudden shock or impact. The oven dried and accurately weighed aggregates are subjected to a total of 15 blows of specified weight and fall and percentage of fines formed in terms of the total weight of the sample is expressed as the aggregate impact value.
Specification
The instrument consists of a circular base with two vertical guides. The hammer of weight 13.75 t 0.25 kg can be raised to fall freely down the vertical guides. The height of fall can be adjusted through 380 + 5 mm. The ham mer is provided with a locking arrangement. The hammer falls freely on the aggregates in the cylindrical cup by trigger action. Cylindrical cup can be clamped firmly to the base and is removable tor emptying. Supplied complete with metal measure 75 mm diameter x 50 mm high (for specimen preparation) and tamping rod 230 mm long x 10 mm dia.
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