TGPSC HMWSSB Manager 2015 Paper 2 · Question 18
Question 18 of the TSPSC Manager (Engineering), HMWSSB, 2015: Paper 2 (Civil Engineering) (1 November 2015). Try it first, then open the answer and explanation.
In a flexible pavement, the different materials with the CBR values are available as follows: 80%, 60%, 15% and 4%. Indicate the order (top to bottom) in which the materials are to be placed for making a good pavement
- 4%, 15%, 60%, 80%
- 4%, 60%, 80%, 15%
- 80%, 60%, 15%, 4%.
- 4%, 80%, 15%, 60%
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Answer: (3) 80%, 60%, 15%, 4%.
In a flexible pavement the wheel stresses are highest at the surface and spread out with depth, so the strongest material (highest CBR) goes on top and weaker layers below. Hence 80% (base), 60%, 15% (sub-base) and 4% (subgrade) from top to bottom.