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Structural Design Specifications

Q1: The minimum compressive strength on 15 cm cubes of M 30 grade concrete at 7 days, should be a minimum of

A 7 N/mm2

B 10 N/mm2

C 20 N/mm2

D 30 N/mm2

ANS:C - 20 N/mm2

3 day strength at list 1/2 of 28-day strength and 2/3 of 28-day strength for 7 days.
So, 2/3 * 20 * 2/3 * 40 = 1/2.



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