Civil Engineering - GATE Exam Questions - Discussion

Discussion Forum : GATE Exam Questions - Section 1 (Q.No. 34)
34.
The cylinder strength of the concrete is less than the cube strength because of
the difference in the shape of the cross section of the specimens
the difference in the slendeness ratio of the specimens
the friction between the concrete specimens and the steel plate of the testing machine
the cubes are tested without capping but the cylinders are tested with capping
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
23 comments Page 3 of 3.

Snehal Wankhede said:   9 years ago
OPTION C governs the true reason.

Although cube strength doesn't determined by capping but the steel plates of machines provide lateral restrained due to friction between steel plates and cube. Lateral restrain increases strength of cubes in that direction.

Snehal Wankhede said:   9 years ago
Option D.

The cylinder is tested with capping (used in UN) which generates compaction only on the effective length of the cylinder (out of 300 mm) whereas in cube testing (used in India) tested without capping (which is not a correct procedure that is why we use this expression cyl strength = 0.8x cube strength).

Sneha Wankhede said:   9 years ago
There is no slenderness ratio comparison between the specimen.

So the answer is either C or D.


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