Question

What is the amount of water required for a workable rc of mix 1:2:4 by weight, when w/c is 0.60 and unit weight of concrete is 2400 kg/m3?

Answer 1

Amount of water = 206 litres.

Explanation:

Unit weight of concrete = 2400 kg/m3

Cement is 1/7th part of the mix by weight as the ration of the RC is 1:2:4.

So the total quantity of cement in 1 cu.m concrete = 2400 / 7 = 343 kg

Given water/cement ratio = 0.6

So quantity of water = 0.6 * one unit of cement = 0.6 * 343 = 206 kg of water.

Assuming that 1 kg of water is equal to 1 litre, the total water required for the desired mix will be 206 litres.