Civil Engineering - Structural Design Specifications - Discussion

28. 

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

Answer: Option B

Explanation:

No answer description available for this question.

Barish Raut said: (Feb 9, 2016)  
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.

Anbarasan said: (Dec 20, 2016)  
Which is correct? @Barish Raut.

Prabhu said: (Mar 13, 2017)  
The Answer should be 15.

Chhaya said: (Apr 20, 2017)  
According to me, the Concrete achieve 66.666% strength So the answer is 13.24.

Roy said: (Sep 9, 2017)  
Yes, for M15 grade, it is 10 n/mm^2.

Chandrakant said: (Aug 10, 2018)  
67% is 70% approx.

Hence 14N/mm2 answer should be 15.

Manohar said: (Aug 28, 2018)  
According to me, the answer is 13.

Ankit Oza said: (Mar 27, 2019)  
In case of M20,

7th-day strength shall be:

20 * 0.65 = 13 N/Sqmm.

Rithu said: (Jul 19, 2019)  
It's 13.5 N/mm2.

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