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  1. concretealc

    Low Compressive Strength

    I am getting low compressive strengths for my C40 concrete.i use cubes to test the strengths.my 3day M Pa is 30 but this is using 600kg/m3 of cement. to me this is a bad result.I should be acheiving that strength using about 400kg/m3 of cement.My w/c ratio is very low;.32-.35.I cant figure out...

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