Concrete
-is a mixture of water, cement, sand, gravel,crushed rock, or other aggregates are held together to form rocklike materials.
-it is composed of concrete and reinforcing bars that act together to provide tensile stress and compressive stress, as a structural member concrete cannot made to be carry the tensile stress since concrete is good only for compression, In this connection, It is necessary to provide a reinforcing bar to provide the tensile strength that concrete does not have.
-aggregates used in concrete may be fine aggregates (sand) and course aggragates (gravel or crushed stone). The nominal maximum sizes of course aggregates are as follows 1/5 the narrowest dimension between side of forms, 1/3 the depth of the slabs, 3/4 the minimum clear spacing between individual reinforcing bars or wires, bundles of bars.This is based in section 5.3.3 of NSCP.
Water
-to complete the mixture of the cement and the aggregates to form a concrete. according to section 5.3.4 water may used in the mixing of concrete must be clean. free from oils, salts, alkalis. and organic materials.
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