9*8m slab 1:2:4 ratio use for M20 mix how much cent is
require it will become in cum but i want bags.

Answer Posted / sundarapandiyan

Bulk material qty for one cum conc=1.52 cum(using 20mm and lesser size aggrigate)
Concrete ratio 1:2:4 = 7 part
cement =1 part
for 9x8m = 72 sqm
assume thickness as =100mm
so cc qty=9X8x0.1=7.2 cum
cement= (7.2x1x1.52)/(1+2+4)=1.563 cum
bulk cement density= 1440 kg ( for clarification cement density mean specific gravity =3.15 mean 3150kg /cum)
so cement in kg=1440X1.563 =2250.72kg
cement in bag= 2250.72/50=45.014 bag can assume as 45 bag.

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