Civil Engineering - UPSC Civil Service Exam Questions - Discussion

I think D is the correct answer.

B is the right answer.

I think B is the right answer.

B is the correct option.

B is the correct answer.

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.

@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.

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.

B is the correct option.

A is correct. B gives split tensile strength not a direct or simple tensile strength.