What ate different grades of concrete?
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Concrete Grade Mix Ratio (cement : sand : aggregates) Compressive Strength
M7.5 1 : 4 : 8 7.5 MPa
M10 1 : 3 : 6 10 MPa
M15 1 : 2 : 4 15 MPa
M20 1 : 1.5 : 3 20 MPa
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