Which of the following it NOT a critical parameter to control cracking and rutting in a flexible pavement?

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SSC JE CE Previous Year Paper 9 (Held on 30 Oct 2020 Morning)
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  1. Tensile strain near the surface close to the edge of the wheel
  2. Vertical sub-base strain
  3. Vertical subgrade strain
  4. Tensile strain at the bottom of bituminous layer

Answer (Detailed Solution Below)

Option 2 : Vertical sub-base strain
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Detailed Solution

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Explanation:

Flexible pavement is modeled as an elastic multilayer structure. Failure criteria in flexible pavement are of following types:

1) Fatigue Cracking

  • It is due to the build-up of horizontal tensile strain at the bottom of the asphaltic concrete layer.
  • The pavement is considered to fail if 20 % of the surface has cracked.

2) Rutting failure

  • It is due to the build-up of excessive compressive strain at the top of the subgrade layer.
  • The pavement is considered failed if it exhibits a rut depth of 20 mm.

Note:

According to IRC 37: 2018, Theoretical calculations suggest that the tensile strain near the surface close to the edge of the wheel can be sufficiently large to initiate longitudinal surface cracking followed by transverse cracking much before the flexural cracking of the bottom layer occurs, if the mix tensile strength is not adequate at higher temperatures. 

So, Vertical sub-base strain is not a critical parameter to control cracking and rutting in flexible pavement.

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