Calculation Of Water Cement Ratio In Concrete Mix Design

Water cement ratio is defined as the ratio of the weight of water to the weight of cement.

Calculation of water cement ratio in concrete mix design.

Water quantity water cement ratio x volume of cement. For the calculation of water quantity for concrete first of all we have to find the quantity of cement. Of water is added. But water cement ratio alone cannot give a good concrete.

It s a calculation. Of cement w c m lbs. In the present example water cement ratio is raised to 0 55 from 0 5. Water quantity 0 4 x 100 kg 40 liters 100 kg cement or 20 liters 50 kg cement bag.

Hence the coarse aggregate as percentage of total aggregate 0 558 0 01 0 548. 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. Of water lbs.

If required higher quality concrete is desired. The practical best water cement ratio is from about 0 40 to over 0 60. A lower water cement ratio can contribute to a high strength and high quality concrete. 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.

A ratio of 0 3 is made concrete too stiff unless superplasticizers are used. 0 7 w c ratio is also used for pumped concrete. 0 5 w c ratio indicates that for every 100 kg of cement 50 lit. Limitation chart for w c ratio shows the maximum value of the w c ratio as per is 456.

An increase of 0 05 in the w c will entail a reduction in the coarse aggregate fraction by 0 01. In is 10262 2009 annex a. For ordinary concrete work sidewalks and driveways. 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.

For design mix the w c ratio will depend upon the workability strength requirements. They have explained the process for design mix. Of water lbs. Water cement ratio as per is 10262 2009 for the concrete mix varies from 0 4 to 0 6.

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. 2000 which can be adopted during 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.