Concrete as per IS 456:2000
The minimum grade of concrete for plain and reinforced shall be as per Table 5. The IS 456: 2000 specifies that in all cases the 28- days compressive strength given in Table 2 (IS 456-2000) shall alone be the criteria for acceptance or rejection of the concrete. In addition Table 11 (IS 456-2000) gives the characteristic compressive strength compliance requirements.The code suggest that concrete will be liable to be rejected if it is porous or honeycombed, its placing has been interrupted without providing a proper construction joint, the reinforcement has been displaced beyond tolerances specified, or construction tolerances have not met. Clause no. 6.2.2 (IS 456-2000) explains about the tensile strength of concrete. Clause no. 6.2.3.1 (IS 456-2000) explains about the modulus of elasticity of concrete. The total shrinkage of concrete depends upon the constituents of concrete, size of the member and environmental conditions.
