Civil Engineering - Concrete Technology - Discussion

14. 

Permissible compressive strength of M 300 concrete grade is

[A]. 100 kg/cm2
[B]. 150 kg/cm2
[C]. 200 kg/cm2
[D]. 250 kg/cm2
[E]. 300 kg/cm2

Answer: Option E

Explanation:

No answer description available for this question.

P.Vamsi said: (Sep 22, 2013)  
Grade of cement tells about strength of concrete.

Sandip said: (Sep 27, 2013)  
The grade represents the compressive strength.

Manoj said: (Oct 26, 2013)  
We know that in M20, M stand to mix and 20 is the characteristic compressive strength of concrete, so as in this Q. 300 is the right answer.

Anil Reddy said: (Jan 12, 2014)  
M300 in in kg/cm2.
We convert this to N/mm2.

1kg = 9.8N nearly 10N.
M300kg/cm2 = M300*10N/(10*10MM2) = M30N/MM2.

For M30 we know 30N/mm2 i.e 300kg/cm2.

Shubham said: (Sep 14, 2014)  
M300 in in kg/cm2.
We convert this to N/mm2.

1kg = 9.8N nearly 10N.
M300kg/cm2 = M300*10N/(10*10MM2) = M30N/MM2.

For M30 we know 30N/mm2 i.e 300kg/cm2.

But,in question asking for permissible comp strength. So, to obtained it divide by 3(factor's of safety for concrete)hence 100kg/cm2 is the right answer.

Rahul said: (Sep 29, 2014)  
It tells about the "characteristic compressive strength" @Sandeep.

Jitesh said: (Jul 3, 2015)  
M300 grade of concrete which is in kg/m2. When we convert it in n/mm2 we get m30. That is its strength is 30n\mm2.

Kulendra said: (Jul 8, 2015)  
But ask about Permissible compressive strength of concrete.

Tony said: (Aug 9, 2015)  
Instead if kg/cm^2 they should have mentioned n/mm^2.

Gyanu said: (Sep 28, 2015)  
Where is used M300?

R Subramanian said: (Mar 21, 2016)  
As per latest technology M200 and M400 grade of concrete is using in other country like Canada and New Zealand.

Debiprasad Mukherjee said: (Jul 19, 2016)  
All the answer value and unit is wrong.

Snehal Wankhede said: (Sep 1, 2016)  
Permissible compressive stress in concrete = 0.33 fck = 100 kg/cm^2.

Duraisamy said: (Apr 7, 2017)  
m15-compressive strength 15n/mm2 in maximum.

1N = 100g.
m20-20N/mm2.
m30-30N/mm2.

Vijay Kumar Singh said: (Apr 17, 2017)  
M 25 grade of concrete the comprehensive strength is 350 to 400 kg/cm^2 is ok or not?

Chetan said: (Aug 23, 2017)  
Wrong answer, according to question,

The permissible compressive strength is required not characteristics compressive strength.

So, direct permissible compressive strength is 75N/mm^2.

And for bending com str is 96N/mm^2.

Thet said: (Nov 11, 2017)  
I want to know concrete grade number for 240 kg/cm2.

Sachin Kumar said: (Aug 21, 2019)  
100 N/mm2 is the right answer.

Bindu said: (Oct 13, 2019)  
The permissible compressive strength of M30 is 11.5.

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