Answer Posted / rajah

As per IS 7 days is not required but 7 days result is just a cross checking (7 days result must more than 77%)

for 28 days
concrete in cmt no of samples(3 cubes)
1) 1 to 5 1
2) 6 to 15 2
3) 16 to 30 3
4) 31 to 50 4
5) 51 and above 4 plus one additional sample for
each additional 50 cmt

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