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Strength:
The strength of aggregates is determined from one of the three tests :
Aggregate Impact Test
In which the aggregates in a mould are subjected to impact caused by dropping a hammer giving 15 blows, and finding the percentage of crushed material, known as the Aggregate Impact Value. For base courses, a limit of 40 per cent is specified and for surfacing courses, a limit of 30 per cent is specified. Figure gives the arrangement of the testing apparatus.
(All dimensions are in millimetres)
Figure: An Aggregate Impact Test equipment
The oven-dry weight of a pat of clay is 1.17 N and the weight of mercury displaced by it is 0.855 N. suppose the specific gravity of solids as 2.71, verify the shrinkage limit and
Aggregate Crushing Test: In which the layer of aggregates in a cylindrical measure is subjected to a compressive load of 40 T, and the per cent fines generated are determined,
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important terms used in levelling
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