Civil Engineering - UPSC Civil Service Exam Questions - Discussion

1. 

Tensile strength of concrete is measured by

[A]. direct tension test in the universal testing machine
[B]. applying compressive load along the diameter of the cylinder
[C]. applying third point loading on a prism
[D]. applying tensile load along the diameter of the cylinder

Answer: Option A

Explanation:

No answer description available for this question.

Shankar Reddy said: (Jan 12, 2017)  
Answer B is correct why because concrete is compression.

Ankit said: (Feb 15, 2017)  
Option A is for tensile strength, option B is for split tensile strength, option C is for the flexural strength test. So, A is correct

Shivam said: (Apr 7, 2017)  
Option B is correct and in option C it should be two point loading instead of third point loading.

Sandeep said: (Sep 28, 2017)  
The tensile strength of concrete is measured in three ways:.

The direct tension, splitting tension, and flexural tension.

It is difficult to test concrete in direct (uniaxial) tension because of the problem of gripping the specimen satisfactorily and because there must be no eccentricity of the applied load.

Therefore, the direct tensile test is not standardized and rarely used.

Option {A} IS RIGHT.

Nik said: (Nov 4, 2017)  
Only option B is correct 100 percent.

Robi said: (Jan 16, 2018)  
A is correct. B gives split tensile strength not a direct or simple tensile strength.

Smriti said: (Mar 11, 2018)  
B is the correct option.

Prashant Patel said: (Apr 12, 2018)  
We can't produce uniform stress in concrete by direct application of tension. So we are use indirect methods to represent the tension strength of concrete. So, Option B is the correct answer.

Khan said: (Jun 6, 2018)  
@All.

We use two test for tensile strength.

1. Flexure test 15cm 15 cm 70 cm applied third point load.

2. Split tensile i.e. cylinder test 15cm * 15cm30cm in this applied load along the length of the cylinder not along a diameter of the cylinder because we placed cylinder longitudinal axis perpendicular to load so how this is possible we apply load along dia. If any dought than tell.

An important note- we are not used UTM for the concrete tensile test because UTM used only for metal and alloy testing.

And if in this question in 2nd option say. Applying compressive load along the full length of specimen or cylinder than 2nd option is right but this is not say specifie what test conduct so clearly seen 3rd point is the answer.

Ashwani Kumar said: (Jun 18, 2018)  
A) is absolutely wrong, because Flexural and Split tensile strength test both are an indirect method.

In Flexural tensile strength test:- Specimen is placed in the testing machine on two 38 mm diameter rollers with c/c distance of 600 mm. Then load is applied through two similar rollers mounted at the third points of supporting span i.e. spaced at 200 mm c/c.

Split tensile strength test:- The compression load is applied diametrically and uniformly along the length of the cylinder until the failure of the cylinder along the vertical diameter.

So option B) is correct.

Chutya said: (Sep 10, 2019)  
B is the correct answer.

Ashutosh said: (Feb 12, 2020)  
B is the correct option.

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