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Structural Design Specifications

Q1: The maximum compressive strength on 15 cm cubes of M 20 grade concrete at 7 days, should be a minimum of

A 7 N/mm2

B 10 N/mm2

C 15 N/mm2

D 20 N/mm2

ANS:B - 10 N/mm2

For 3 days = 30 percent,
For 7 days = 67.7 percent,
For 14 days = 90 percent,
For 28 days = 99 percent,
So, the answer is 13.5 min.



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