Civil Engineering - Concrete Technology - Discussion

Answer should be 37.5Kg/cm2 for direct compression and 40Kg/cm2 for bending compression, 150 is Characteristic strength not permissible.

I think 150 kg/cm^2 is correct.

The correct answer is 150 as per SSC JE answer key.

The answer should be option B.

I know that compressive strength of M150 is 150kg/cm2, but it is 200kg/cm2 how?

It is 150 kg/cm^2 only. Option B is correct. Don't confuse between permissible and ultimate strength.

If we design the mix for M150 grade means permissible will be 150kg/cm^2 only. Sometimes during testing due to some variations strength decreases for ex.130 or 135kg/cm^2 or 200kg/cm^2 even if we designed for M150 grade concrete. But we designed for M150 means we must conclude the answer to be 150kg/cm^2 irrespective of what ever we obtained.

In SCC sometimes permissible strength varies due to trail and error Mix design methods,but here they didn't mention anything as SCC(Self Compacting Concrete)
Finally, option B is correct.

Hope this will clear the confusion.

Please tell me the correct answer.

150kg/cm^2 is the correct answer.

150kg/cm2 is the correct answer.

Please explain the answer.