Answer Posted / er. vaseem ahamad

Normally m-20 concrete usage is very popular for residential buildings upto three storey buildings.If we try to make m-20 grade concrete with single size coarse aggregate,concrete will be harse and honeycombing chances is more in columns,so ideally we should use 20 mm and 10 mm mix in proportion of 60% and 40% .If this is not possible we have to make concrete 01:02:03 for good cohesiveness in concrete practically.

Er. Vaseem ahamad,gorakhpur

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