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How to find quantity of cement bags, sand, coarse aggregate, from 1m3 of concrete of m20 design?
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Answer Posted / z.m mughal
M20 = 1:1½:3
Wet concrete = 1 cum
To convert wet to dry material of concrete, we multiply 1.54. (Note 1.54 is for concrete but if we calculate dry material of mortar, we will multiply 1.27)
1*1.54=1.54 cum (dry material)
Formula of material is
Ratio/sum of ratio * total material quantity
Sum of ratio = 1 1½ 3 = 5.5
Total material quantity = 1.54 cum
Cement, 1/5.5 * 1.54 = 0.28 cum
0.28/0.0354 = 7.909 bags , say 8 bags
(Note: 0.0354 is volume of 50kg cement bag in cum and 1.25 in cft).
Sand or fine aggregate, 1.5/5.5 * 1.54 = 0.42 cum
Coarse aggregate, 3/5.5 * 1.54 = 0.84 cum.
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