What should be the 28 days cube strength for M-25 grade
concrete?How it is connected with acceptance criteria of
fck+3 as per IS 456-2000 and why?
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Answer Posted / n pandian
The quality of concrete is acceptable only if both 1) and 2) are satisfied:
1) As per column 2 in Table 11 of IS 456 – 2000, mean of the group of 4
non-overlapping consecutive test results shall be greater than or equal to
a) (fck + 0.825s) N/mm2
where fck is the characteristic compressive strength of concrete;
s is the established standard deviation which is to be arrived for
atleast 30 samples as early as possible at site.
Note: In the absence of established standard deviation value assumed standard deviation values given in Table 8 of IS: 456-2000 may be used.
b) (fck + 3) N/mm2 for M15 or (fck + 4)for N20 and above
a) or b) whichever is greater
2) As per column 3 in Table 11 of IS: 456 – 2000, Individual test Results (ITR) shall be greater than or equal to (fck - 3) N/mm2.
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