Formula to Find Cube Compressive Strength

What is the formula to find the cube compressive strength? Explain in detail.

Interview Candidate
Jan 2nd, 2017
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anas

Jan 22nd, 2017

Size of the cube =15cm x15cm x15cm
Area of the specimen (calculated from the mean size of the specimen )=225cm2
Characteristic compressive strength(f ck)at 7 days =
Expected maximum load =fck x area x f.s
Range to be selected is …………………..
Similar calculation should be done for 28 day compressive strength
Maximum load applied =……….tones = ………….N
Compressive strength = (Load in N/ Area in mm2)=……………N/mm2
=……………………….N/mm2