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Civil Engineering - GATE Exam Questions - Discussion

Discussion Forum : GATE Exam Questions - Section 1 (Q.No. 34)
GATE Exam Questions
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 2 of 3.
Pawan Pinto said:   6 years ago
Option B is correct. When Effective length to least lateral dimension is considered here value of lamda is more for cylindrical section and hence more chance of failure.
Bijan said:   7 years ago
Concrete cubes under axial compression fail in lateral tension due to poisson's effect. If the contact surface between the concrete cube and plate of the testing machine is rough, inclined cracks form otherwise almost vertical cracks form if surface between cube and plate is smooth. So option C is correct.
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.
Prathik said:   8 years ago
C is the right answer. Area of contact of cube is more than that of cylinder for given volume.
Roy said:   8 years ago
D is the right option.
Harish said:   8 years ago
Option C is correct.

There is no friction in the middle portion for cylindrical cube.
Azhar said:   8 years ago
Answer is C. Platten effect is the main reason.
Suraj said:   9 years ago
B is Correct.

Slenderness Ratio is different in both specimens.
Pooja sonar said:   9 years ago
@Rahul.

How C is a correct answer? Explain.
Rahul said:   9 years ago
I think C is right answer.
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