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compressive strength of st4 concrete 1

normal strength concrete 124 complying to a standardized prescribed concrete mix ST4 with an expected target strength of 20mPa BS 8500-12002 and BS 8500-2 2002 and S2 slump was attained with a water cement ratio of 0.6 or 60. A total of 32 number of 150mm cubes were cast and observed for 7, 14, 21, and 28 curing days.