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Civil Engineering - Structural Design Specifications - Discussion

Discussion Forum : Structural Design Specifications - Section 1 (Q.No. 28)
Structural Design Specifications
28.
The maximum compressive strength on 15 cm cubes of M 20 grade concrete at 7 days, should be a minimum of
7 N/mm2
10 N/mm2
15 N/mm2
20 N/mm2
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
13 comments Page 2 of 2.
PRABHU said:   8 years ago
The Answer should be 15.
ANBARASAN said:   9 years ago
Which is correct? @Barish Raut.
Barish Raut said:   10 years ago
The answer seems to be wrong. Concrete achieves 65% strength in 7 days. Characteristic compressive strength of M20 Grade Concrete is 20N/mm2. So 65% of 20 = 13N/mm2.
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