Answer / g himanth kumar

For the concrete with different grades the strength development for 7days is approximately 60 to 70% of its 28days characteristic strength.

Answer / imran

Ok fine let me start with 7 days strength, the provision of 7 Days Strength is now ended over Globally, else in previous version of IS was two third of the characteristics strength and 100% of characteristic strength after 14 days.
There Fore the Deflected Strength for M-25 in:
7 Days 16.67 N/mm2.
14 Days 25.00 N/mm2
28 Days 28.00 N/mm2 (As per Latest Revision of IS 456 Fck + 3)

Answer / santo.m.f

M25 test result at 7 days is of its 65%. ie; M25:-16.25 N/mm2. then 14 days 90%. ie; M25:- 22.5 n/mm2 .

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