![]() ![]() NOTE – In case the coarse aggregate is not angular one. the corrected proportion of the volume of coarse aggregate for the water-cement ratio of 0.40 = 0.62. ![]() the proportion of the volume of coarse aggregate is increased by 0.02 (at the rate of -/+ 0.01 for every ± 0.05 change in the water-cement ratio). As the water-cement ratio is lower by 0.10. the volume of coarse aggregate is required to be increased to decrease the fine aggregate content. In the present case, the water-cement ratio is 0.40. The Proportion of the Volume of Coarse Aggregate and Fine Aggregate Contentįrom Table 3 of IS 10262:2009, the volume of coarse aggregate corresponding to 20 mm size aggregate and fine aggregate (Zone I) for a water-cement ratio of 0.50 =0.62. Calculation of Cement Contentįrom Table 5 of IS 456:2000, minimum cement content for ‘EXTREME’ exposure condition = 370 kg/m 3ģ70 kg/m 3 > 360 kg/m 3, hence, O.K. Hence the arrived water content = 197- = 147 litres. (Note: If Super plasticizer is used, the water content can be reduced upto 20% and above.)īased on trials with Super plasticizer, water content reduction of 25% has been achieved. Selection of Water Contentįrom Table 2 of IS 456:2000, maximum water content =186 litres (for 25 to 50 mm slump range) for 20 mm aggregate.Įstimated water content for 100 mm slump =186+(6/100) x 186 =197 litres. ‘fck’ is the Characteristic Compressive Strength at 28 days, andĪs per the table I of IS: 10262-2009, the standard deviation, s is 5.0 N/mm 2 ‘f target‘ is the Target Average Compressive Strength at 28 days, Procedure for Concrete Mix Design of M 45 Concrete
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