how much water you will add to the mix, for making 1 m3 of
concrete to achieve strength of mix 20N/mm2 at 28 days.

Answer Posted / sabeer

Ratio of M20 concrete- 1:1.5:3
Volume of cement in 1 m3 concrete= 1/5.5 = 0.1818 m3
Weight of cement = 1440*0.1818 = 261.8 kg
Water cement ratio of m20- .45
Quantity of water = 0.45*261.8= 118 litre

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