Calculation Of Water Cement Ratio In Concrete Mix Design

Of water lbs.

Calculation of water cement ratio in concrete mix design.

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. A good mix proportion and quality aggregates and binding materials contribute to good mix design. Hence the coarse aggregate as percentage of total aggregate 0 558 0 01 0 548. A lower water cement ratio can contribute to a high strength and high quality concrete.

A low water cement ratio is hence one of the factors influencing good mix design. Of cement w c m lbs. 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. For the calculation of water quantity for concrete first of all we have to find the quantity of cement.

But water cement ratio alone cannot give a good concrete. The practical best water cement ratio is from about 0 40 to over 0 60. Of water lbs. In the present example water cement ratio is raised to 0 55 from 0 5.

It s a calculation. 0 5 w c ratio indicates that for every 100 kg of cement 50 lit. An increase of 0 05 in the w c will entail a reduction in the coarse aggregate fraction by 0 01. 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.

Water cement ratio as per is 10262 2009 for the concrete mix varies from 0 4 to 0 6. If required higher quality concrete is desired. Just assume that the required volume of cement for the mix is 100 kg and w c is 0 4. Limitation chart for w c ratio shows the maximum value of the w c ratio as per is 456.

For ordinary concrete work sidewalks and driveways. 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. They have explained the process for design mix. In is 10262 2009 annex a.

Of water is added. A ratio of 0 3 is made concrete too stiff unless superplasticizers are used. For design mix the w c ratio will depend upon the workability strength requirements. 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.

2000 which can be adopted during mix design. In case of trial mix 3 water cement ratio is varied by 10 keeping water content constant. 0 7 w c ratio is also used for pumped concrete. Water cement ratio is defined as the ratio of the weight of water to the weight of cement.