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.

Shashank Sharma said: (Feb 21, 2020)  
Since here, it asked for the permissible stress of concrete in bending compression and in WSM we know that for finding the permissible stress we divide it by 3 (i.e. FOS for concrete) in WSM so after dividing.

300 kg/cm2 รท 3 = 100 kg/cm2 should be the answer.

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