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Civil Engineering : Structural Design Specifications - Quiz(MCQ)
The minimum compressive strength on 15 cm cubes of M 30 grade concrete at 7 days, should be a minimum of______.
A)
30 N/mm²
B)
20 N/mm²
C)
10 N/mm²
D)
7 N/mm²

Correct Answer :   20 N/mm²

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