Answer Posted / james

For 1 m3 of concrete (1:2:4)
for Required volume of concrete 1.00
Add extra for additional voids in concrete (50%)
0.50
Total qty= 1.50 Cum
Mix total (1+2+4) 7

Therefore Quantity of cement = (1.50/7) 0.2143 Cum
Qty of Cement in bags = ( 0.2143*1440)=308.57kg
Therefore; Bag of Cement=50kg
Qty of Cement in Mix Ratio 1;2;4 = 308.57/50kg = 6.17 Bags
say(6 bag)
Qty of sand in bags = (2/7)*1.5 = 0.43 Cum
Qty of Aggregate = (4/7)*1.5 = 0.86 Cum

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