Calculation Of Water Cement Ratio In Concrete Mix Design

Calculate water cement ratio from the maximum free water cement ratio according to environmental exposure condition as per table 5 of 456 2000 this is the limitation given by indian standard.

Calculation of water cement ratio in concrete mix design.

Water cement ratio as per is 10262 2009 for the concrete mix varies from 0 4 to 0 6. Water cement ratio is defined as the ratio of the weight of water to the weight of cement. The practical best water cement ratio is from about 0 40 to over 0 60. An increase of 0 05 in the w c will entail a reduction in the coarse aggregate fraction by 0 01.

A lower water cement ratio can contribute to a high strength and high quality concrete. If required higher quality concrete is desired. For ordinary concrete work sidewalks and driveways. Of water lbs.

The water to cement ratio is calculated by dividing the water in one cubic yard of the mix in pounds by the cement in the mix in pounds. In the present example water cement ratio is raised to 0 55 from 0 5. 2000 which can be adopted during mix design. Of water lbs.

Required amount of water w c ratio x cement volume therefore required amount of water 0 5 x 50 kg 25 litres 50 kg cement bag. Limitation chart for w c ratio shows the maximum value of the w c ratio as per is 456. But water cement ratio alone cannot give a good concrete. So if one cubic yard of the mix has 235 pounds of water and 470 pounds of cement the mix is a 50 water to cement ratio.

How to calculate water cement ratio the water to cement ratio is calculated by dividing the water in one cubic yard of the mix in pounds by the cement in the mix in pounds. It s a calculation. A good mix proportion and quality aggregates and binding materials contribute to good mix design. Of water is added.

So if one cubic yard of the mix has 235 pounds of water and 470 pounds of cement the mix is a 1 2 water to cement ratio. A ratio of 0 3 is made concrete too stiff unless superplasticizers are used. 0 5 w c ratio indicates that for every 100 kg of cement 50 lit. Just assume that the required volume of cement for the mix is 100 kg and w c is 0 4.

In case of trial mix 3 water cement ratio is varied by 10 keeping water content constant. Water quantity water cement ratio x volume of cement. Of cement w c m lbs. For design mix the w c ratio will depend upon the workability strength requirements.

A low water cement ratio is hence one of the factors influencing good mix design. In is 10262 2009 annex a. They have explained the process for design mix. For the calculation of water quantity for concrete first of all we have to find the quantity of cement.