cylinder strength analysis

Low Concrete Cylinder Strength Analysis

ACI defines required average compressive strength (fc’r) as the larger of the following equations:     fc’r = fc’ + 1.34 x S fc’r = fc’ + 2.33 x S – 500 (<= 5000psi) fc’r = 0.9 x fc’ + 2.33 x S (> 5000psi) Where: fc’ is design or specified strength S is the sample