Answer / 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.

Answer / amr

The strength of a mix is described by its strength after 28 days from casting. if a concrete of M50; the compresive strength 50 unit achieve only after 28 days from casting

Answer / mr

In general concrete avmchieves it's maximum strength on 28 days , Thad why concrete cylinders are tested after 28 days to check whether the concrete has achieved the required strength

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