### COMPRESSIVE STRENGTH OF CONCRETE

Compressive Strength of Concrete IS 456 Interpretation of Test Results of Sample specified Grade Mean of the Group of 4 NonOverlapping Consecutive Test Results In N/mm2 Individual Test Results In N/mm2 (1) (2) (3) M 20 > fck + X established SD > fck 3 N/mm2 or above (rounded off to nearest N/ mm2) Or fck + 3 N/mm2, whichever is greater