what are IS code for
M20, 25, etc
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Answer Posted / dayanidhi balabantaray
I think IS code 456-2000 & all so with IS code 10262
7 days compressive strength is above 67%
28 days compressive strength is Fck+4
Fck=characteristic strangth
for eg. characteristic strangth is 20 N/mm2 so 20+4=24N/mm2
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