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Cement Sand Aggregate Ratio Concrete M20 M30 M40

maximum water cement ratio (as per contract) = 0.45 v = absolute volume of fresh concrete, which is equal to gross volume (m3) minus the volume of entrapped air , (fa) , (ca) = total mass of fine aggregate and coarse aggregate (kg) per m3 of please send me the different types of mix designs (m20.m30,m40,m50) for 

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