Answer Posted / prakash pandiyan

for designing 1m3 concrete of M25 mix the ratio is 1:1:2
for calculating cement,sand and course aggregate ,
for 1m3 add 50% for shrinkage and wastage so 1.5m3
1.5m3/(1+1+2)=.375
density of cement =1440kg/m3=says 1440/50=28.8bags
cement required for this mix=.375*28.8=10.8bags
sand=.375*1=.375m3
course aggregate=.375*2=.75m3
FINALLY WE SAY 10.8 BAGS/M3

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