How to Calculate Compressive Strength Sciencing
CS = 71,000 pounds ÷ 28.26 in 2 = 2,512 psi. So the compressive strength of your sample is 2,512 psi. Incidentally, this meshes with the standard 2,500 psi compressive strength of concrete for residential applications; concrete for commercial structures can have a compressive strength of 4,000 psi or more.
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