# Civil Engineering - Concrete Technology - Discussion

### Discussion :: Concrete Technology - Section 1 (Q.No.14)

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

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.