Compaction must reach the underlying layers allowing the majority of the air voids to escape. The strokes per layer during the compaction must not be less than 30 in number. The mixed concrete is placed into the molds in layers not less than 5cm deep. Before placing the concrete mix within the mold, the interior of the mold must be properly greased to facilitate easy removal of the hardened cylinder. The mold must hold the concrete without any leakage. Even under severe conditions, the moulds used must retain its original shape and dimensions. The cylinder specimens are cast in steel, cast iron or any mold made of non-absorbent material. Procedure for Concrete Cylinder Test Sample Preparation Cylinder mold of 150mm diameter and 300mm height or 100 x 200mm.The apparatus required is mentioned below: The diameter of the cylinder cast must be at least 3 times the nominal maximum size of the coarse aggregate employed in the concrete manufacture. The sample cylinder prepared can be any of the two dimensions as mentioned below. Precautions for Compressive test on Concrete Cylinder.Compressive Strength of Different Grades of Concrete at 7 and 28 Days.Compressive Strength of Concrete at Various Ages.Calculations for Compressive Strength of Concrete Cylinder.
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