# Civil Engineering - Concrete Technology - Discussion

Discussion Forum : Concrete Technology - Section 3 (Q.No. 1)

1.

Permissible compressive strength of M 150 concrete grade is

Discussion:

28 comments Page 1 of 3.
Bharath E said:
8 years ago

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.

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.

Raviraj Patel said:
7 years ago

It's 150 because M150 means M denotes design mix of concrete and 150 denotes the permissible comprehensive strength of concrete after 28 days of 150mm cube.

Like GRADE OF CONCRETE- CSO CONCRETE

M15 15

M20 20 Etc

Like GRADE OF CONCRETE- CSO CONCRETE

M15 15

M20 20 Etc

Makvana Disha said:
7 years ago

Here, permissible strength is required to be determine fck 150 is already given. So, permissible strength= fck/partial safety factor.

150/1.5 = 100 kg/sq.cm.

fck = characteristic compressive strength of concrete at 28 days after curing.

150/1.5 = 100 kg/sq.cm.

fck = characteristic compressive strength of concrete at 28 days after curing.

Pusp Raj Bhatt said:
8 years ago

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

Vivek Rauniyar said:
9 years ago

For M150 the compressive is 150 kg/cm2 but this is ultimate compressive strength not permissible compressive strength.

Pankaj said:
7 years ago

100 kg/cm2 is the right answer because we allow it after failure in compressive standard unit.

123 said:
1 decade ago

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

Subrat barad said:
1 decade ago

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

Kirti said:
9 years ago

But permissible compressive strength must be law. How it can be more?

Sonu Raj said:
7 years ago

What the difference between permissible and characteristics strength?

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