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.
A low water to cement ratio is the number one issue effecting concrete quality. On an average 25% of water by weight of cement is required for the completion of chemical reactions in the process of hydration of cement.
For any nominal mix of concrete, there is a maximum free water cement ratio as per of IS 456:2000. Depending upon the exposure condition the water/cement ratio will vary.
Let cement volume = 50 kg
Required amount of water = W/C Ratio X Cement Volume
Therefore, Required amount of water = 0.5 X 50 kg = 25 liters / 50 kg cement bag.
Normally, the water cement ratio being between 0.4 to 0.6 as per IS standard.
- If we keep on adding water to increase the work ability then the concrete has lots of fluid materials where the aggregates will settle down, this known as Bleeding . Once the water evaporated it leaves lots of voids in concrete which affects the concrete strength.And causes cracks in the strucrure
- If the amount of water is low, the hydration process will not be as good as required, and our concrete will not be able to gain strength accordingly.