Concrete test specimen sampling: Cube vs Cylinder strength standards

Understanding concrete compressive strength conversion ratios between 15x15 cm cubes and 15x30 cm cylinders per engineering codes.

Sampling concrete test cylinders and cubes at bored pile site
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Cube vs Cylinder Strength Conversion

Cube strength (15x15 cm) measures approx 1.15-1.20 times cylinder strength (15x30 cm); e.g., 240 ksc cylinder equals 280 ksc cube.

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