Question

what is the strength of rcc column & beam if 20mm crushed stone used in m20 mix

Answer 1

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1) M15 grade Concrete: 1:2:4 is the ratio of Cement,River Sand and 20mm size Stone aggregate. This mix of Concrete is used for the Foundation, Pillar, Beam and Slabs. This concrete will have a Strength of 15 N/Sqmm ( 150kg/Sqcm ) afterr 28 days .