Answer Posted / m. jahir hussain. b.e

They are mostly Tow types of Aggregate used in concrete:

The Constant value of: 20mm = 1.57(it have no unit) please
40mm = 1.52 refer Indian Standard Code

1:2:4 concrete mix: 20mm
1.57/7(1+2+4)= 0.2243

o.2243 x 1 (cement)
0.2243 x 2 (Fine Aggregate)
0.2243 x 4 (Coarse Aggregate)

This ratio concrete mix Cement is
0.2243 x 1440(This is unit wt of cement
of 1 M3)
Ans = 322.992 kg cement or (6.46 bags)

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