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    testing (g) (b) For each test portion, the aggregate impact value (AIV) to the nearest 0.1 from: AIV = (Mf /Mt) *100 (c) The mean of the values obtained in (b) for each of the two test samples to the nearest 0.1. 6. Reporting Report the mean of the two results to the nearest whole number as the aggregate impact value (AIV).

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    Aggregate impact value gives the relative strength of aggregates against impact loading.

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    Aggregate Impact Test This test is specified in BS812:Part 3 : 1975. Resistance to impact of a sample of aggregate is measured by subjecting a 28mm deep bed of 14 mm to 10 mm chippings, in a 102mm diameter hardened steel cup, to 15 blows from a 14 kg hammer falling from a height of 380mm.

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