TUTORIALS

How to compute water quantity for concrete

The water to cement ratio is the ratio of the water weight to the cement weight utilized in a concrete mix.

Water cement ratio differs from 0.35 to 0.70 according to exposure condition (kind of work, working location, climate).

In case water cement ratio is below 0.4, complete hydration will not be assured.

Some feasible measures for water cement ratio for structure reinforced concrete:

Let’s talk about concrete grade ratio.

• 0.45 for 1:1:2 concrete (m25 concrete)
• 0.50 for 1:1.5:3 concrete
• 0.5 to 0.6 for 1:2:4 concrete (m15 concrete)

Concrete vibrated by effective mechanical vibrators need less water concrete ratio and therefore possess greater strength.

In case we have to compute concrete water quantity, initially find out the cement quantity for the volume.
In case we suppose needed cement volume as 50 kg
Needed quantity of water = Water cement ratio x cement volume = 0.50 litre x 50 kg = 25 litre

25 litre water needed for every 50 kg cement bag
Also, for design mix, water cement ratio relies upon the workability.
Water weight = 30% cement weight + 5% whole aggregate weight

To gather more details, go through the following video tutorial.

Lecturer: fieldwork expert