Why we test compressive strength after 28 days..?

Answer Posted / senthil473

after 28 days 99% of characteristics compressive strength will be achieved( rate of hydration is faster). after 28 days in a long course of time, say 1 year, the balance 1% strength will be achieved( rate of hydration is very slower). it is not desirable to keep the cube for 1 or 2 years and test , if the full strength is achieved. so we test after 28 days.

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