Answer / n rajesh guttedat

In 7 days compressive strength must be 65% of 28 days strength

Answer / sjtbehera

compressive strength of 28 days or 7 days can be obtained
from compresseve testing machines. but As per IS code
minimum strength can not beyond strength of 28 days or 7
days

example- M 25= after 28 dyas strength should be 25 N/MM2

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