![]() ![]() N/mm 2 (at 28 days) Compressive Strength of Concrete at Various Ages N/ mm 2 (at 7 days)Īverage compressive strength of the concrete cube =. Appearance of fractured faces of concrete and the type of fracture if they are unusualĪverage compressive strength of the concrete cube =.Curing conditions, including date of manufacture of specimen.NĬompressive strength = (Load in N/ Area in mm 2)=.N/mm 2 Similar calculation should be done for 28 day compressive strength ![]() Calculations of Compressive StrengthĪrea of the specimen (calculated from the mean size of the specimen )=225 cm 2Ĭharacteristic compressive strength(f ck)at 7 days = The average of three specimens gives the crushing strength of concrete. If the strength of any specimen varies by more than 15 percent of average strength, the results of such specimens should be rejected. Minimum three specimens should be tested at each selected age.
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