Calculation Of Water Cement Ratio In Concrete Mix Design

0 7 w c ratio is also used for pumped concrete.

Calculation of water cement ratio in concrete mix design.

Hence the coarse aggregate as percentage of total aggregate 0 558 0 01 0 548. For ordinary concrete work sidewalks and driveways. Of water is added. Water quantity 0 4 x 100 kg 40 liters 100 kg cement or 20 liters 50 kg cement bag.

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. Of water lbs. The practical best water cement ratio is from about 0 40 to over 0 60.

For the calculation of water quantity for concrete first of all we have to find the quantity of cement. 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. Just assume that the required volume of cement for the mix is 100 kg and w c is 0 4. A lower water cement ratio can contribute to a high strength and high quality concrete.

Of cement w c m lbs. For design mix the w c ratio will depend upon the workability strength requirements. In the present example water cement ratio is raised to 0 55 from 0 5. A good mix proportion and quality aggregates and binding materials contribute to good mix design.

A ratio of 0 3 is made concrete too stiff unless superplasticizers are used. Water quantity water cement ratio x volume of cement. In case of trial mix 3 water cement ratio is varied by 10 keeping water content constant. Limitation chart for w c ratio shows the maximum value of the w c ratio as per is 456.

0 5 w c ratio indicates that for every 100 kg of cement 50 lit. But water cement ratio alone cannot give a good concrete. An increase of 0 05 in the w c will entail a reduction in the coarse aggregate fraction by 0 01. A low water cement ratio is hence one of the factors influencing good mix design.

Of water lbs. 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. 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. 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.

It s a calculation. They have explained the process for design mix. In is 10262 2009 annex a. If required higher quality concrete is desired.