Civil Engineering - UPSC Civil Service Exam Questions - Discussion

46. 

Consider the following strengths of concrete :
1. Cube strength
2. Cylinder strength
3. Split-tensile strength
4. Modulus of rupture
The correct sequence in decreasing order of these strengths is

[A]. 3, 4, 2, 1
[B]. 3, 4, 1, 2
[C]. 4, 3, 2, 1
[D]. 4, 3, 1, 2

Answer: Option D

Explanation:

No answer description available for this question.

Desinerd said: (Aug 19, 2014)  
Modulus of rupture ->Tensile strength under bending is very low.

Split-tensile strength-->Standard tensile strength.

Cube strength for a given concrete mix is 5% to 25% more than cylindrical strength. The variation in percentage corresponds to increase in concrete strength. Hence the correct answer is C) 4, 3, 2, 1.

Gubi said: (May 18, 2015)  
1. Modulus of rupture is gives the strength of concrete at the breaking point so that it is higher than others.

2. Cube strength is compressive strength which is higher than Split tensile strength. This strength represents the cracking point of the concrete cube, so it will be lesser than the Modulus of rupture.

3. Split tensile Strength was conducted on concrete cylinder so that second option given was wrong. And tensile strength is always lesser than compressive strength of cube.

The answer should be 4, 1, 2 (or) 3.

Mounir Mata said: (May 14, 2016)  
Split strength = 0.50 - 0.70 modulus of repture.

Cylinder strength = 0.80 cube strength.

So, the sequence is 3 - 4 - 2 - 1.

Chhaya said: (May 8, 2017)  
You are right @Desinerd.

Sanda said: (May 23, 2017)  
1) fck = cube strength i.e 50 N/mm^2.
2) f'c = 0.8 * fck= 40 N/mm^2.
3) fct = 0.66 * fcr = 0.66*4.94= 3.29 N/mm^2.
4) fcr = 0.7 * Sqrt(fck)= 4.94 N/mm^2.

So, Answer 3, 4, 2, 1.

Anbu said: (Jan 11, 2018)  
Decreasing order so, 1, 2, 4, 3.

Aamir said: (Apr 30, 2018)  
Yes, Right @Anbu.

Yempee said: (Sep 29, 2019)  
Please anyone explain the answer in detail.

Sumon said: (Oct 2, 2019)  
The answer is asking in decreasing order. Explain please.

Hemendra Maurya said: (Dec 14, 2019)  
Civil engineers don't read the question they just matching the answers but they must know that cube strength is compressive strength which always greater than the modulus of (tensile strength) so the correct sequence is 1,2,4,3.

Sunil said: (Apr 18, 2020)  
1 2 4 3 is right.

Agree @Anbu.

Saumik said: (Nov 21, 2020)  
The Answer should be 1 2 4 3.

Amit Singh said: (Jan 27, 2021)  
Cube strength >Cylindrical strength >Modulus of rupture > split tensile strength.

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