How do I calculate the water-cement ratio for concrete?

What is water cement ratio?

The ratio between the weight of water to the weight of cement in the concrete mix is called Water Cement (W/C) ratio.

How do I calculate the water-cement ratio for concrete?

How to calculate the quantity of water for Concrete?

Normally, the water cement ratio being between 0.4 to 0.6 as per IS standard.

We take 0.42 as a ratio of W/C.

Quantity of water = 0.42 x 50 = 21 Liters (1 bag cement = 50 Kg)

So the required quantity of water is 21 Liters per cement bag.

Thumb Rule?

M15 Ratio 1:2:4

cement = 317 Kg (unit weight = 1440 kg/cum)

Sand = 638 Kg (unit weight = 1450 Kg/cum)

Blue Metal = 1478 Kg (unit weight = 1680 Kg/Cum)

Total = 316.8+638+1478 = 2433 Kg

unit weight of Water = 1000 Kg

Water ratio = 1000/2433 = 0.41

By this method you can calculate the water-cement ratio for concrete.

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