1STRENGTH TESTS ON CONCRETE(1) Compressive Strength Test (ASTM C 39)Basic procedure: Apply a compressive axial load to a cylindrical specimen at a prescribed rate until failure occurs. Calculate and report the compressive strength.Compressive Strength = Maximum load /Cross-sectional area of specimenRequirements for Cylindrical Test Specimens: (1) Length should be 2 times the diameter. Most commonly used: 12 inches in length & 6 inches in diameter. (2) Diameter should be at least 3 times the maximum aggregate size. (3) The ends should be ground or capped to provide smooth loading surfaces.Making cylindrical test specimens in the fieldCuring test specimens in a moist room
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