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Procedure of determining the compressive strength of hardened concrete

Compressive Strength of Concrete IS 456 Interpretation of Test Results of Sample specified Grade Mean of the Group of 4 Non-Overlapping Consecutive Test Results In N/mm2 Individual Test Results In N/mm2 (1) (2) (3) M 20 fck + 0.825 X established SD fck -3 N/mm2 or above (rounded off to nearest 0.5 N/ mm2) Or fck + 3 N/mm2, whichever is greater

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