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0 7 w c ratio is also used for pumped concrete.
Calculation of water cement ratio in concrete mix design. But water cement ratio alone cannot give a good concrete. Of water lbs. 0 5 w c ratio indicates that for every 100 kg of cement 50 lit. A ratio of 0 3 is made concrete too stiff unless superplasticizers are used.
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. Just assume that the required volume of cement for the mix is 100 kg and w c is 0 4. 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 50 water to cement ratio.
Water quantity 0 4 x 100 kg 40 liters 100 kg cement or 20 liters 50 kg cement bag. In is 10262 2009 annex a. 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. They have explained the process for design mix.
Limitation chart for w c ratio shows the maximum value of the w c ratio as per is 456. The practical best water cement ratio is from about 0 40 to over 0 60. Water cement ratio is defined as the ratio of the weight of water to the weight of cement. If required higher quality concrete is desired.
In case of trial mix 3 water cement ratio is varied by 10 keeping water content constant. A low water cement ratio is hence one of the factors influencing good mix design. For the calculation of water quantity for concrete first of all we have to find the quantity of cement. An increase of 0 05 in the w c will entail a reduction in the coarse aggregate fraction by 0 01.
For ordinary concrete work sidewalks and driveways. A lower water cement ratio can contribute to a high strength and high quality concrete. 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. 2000 which can be adopted during mix design.
Of water is added. A good mix proportion and quality aggregates and binding materials contribute to good mix design. It s a calculation. Of water lbs.
Water quantity water cement ratio x volume of cement. Hence the coarse aggregate as percentage of total aggregate 0 558 0 01 0 548. In the present example water cement ratio is raised to 0 55 from 0 5. Water cement ratio as per is 10262 2009 for the concrete mix varies from 0 4 to 0 6.
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