SPECIFICATION FOR COARSE AND FINE AGGREGATES FROM NATURAL SOURCES FOR CONCRETE IS:383

This standard covers the requirements for aggregates, crushed or
uncrushed, derived from natural sources, such as river terraces and riverbeds,
glacial deposits, rocks, boulders and gravels, for use in the Production
of concrete for normal structural purposes including mass concrete works.
3.3 Aggregate Crushing Value-The aggrcgnte crushing value, when
determined in accordance with IS: 2386 (Par! IV)-1963 shall not exceed
45 pcrcwt for aggregate used for concrete other than for wt lring surfaces,
and 30 percent for concrete for wearing surfaces, such as runways, roads
and pavements.
3.4 Aggregates Impact Value- As an alternative to 3.3 the aggregate
impact value may be determined in accordance with the method specified
iu IS : 2386 i Part IV )-1963. The aggregate impact value shall not exceed
45 percent by weight for aggregates used for concrete other than for
wearing surfaces and 30 percent by weight for concrete for wearing
surfaces, such as runways, roads and pavements.
3.5 Aggregate Abrasion Value- Unless otherwise agreed to between
the purchaser and the supplier, the abrasion value of aggregates, when
tested in accordance with the method specified in IS:2386 (Part IV)-
1963 using Los Angeles machine, shall not exceed the following values:
a) For aggregates to be used in 30 percent
concrete for wearing surfaces
t,) For aggregates to be used in 50 perrent
other concrete