Civil Engineering - Structural Design Specifications - Discussion

35. 

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

Answer: Option C

Explanation:

No answer description available for this question.

Pankaj Teware said: (Mar 18, 2014)  
7 days strength is = (2/3)*Fck.

Rohit said: (Mar 15, 2018)  
At 7 day minin compressive strength is 65%.

So 30*65/100=19.50.

Bishnu Joshi said: (Jun 29, 2021)  
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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