Water cement ratio is (0.4 to 0.6) according to IS456

so,

Cement required for 1m³ of M20 Concrete is 400 kg

Water required = cement weight x Water cement ratio

400 * 0.5 = 200 liters

Nice

Ratio for M20 grade concrete is 1:1.5:3

Cement = 1 Part

Sand = 1.5 Part

Coarse Aggregate = 3 Part

Total Parts = 1 + 1.5 + 3 = 5.5

Dry volume = Wet volume x 1.55 (You can also take it as 1.50 to 1.55)

So, Dry volume of concrete = 1 x 1.55 = 1.55 m³

Quantity of cement = (Dry volume of concrete x cement ratio)/(sum of the ratio)

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