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Q: Which of the following is NOT a critical parameter to control cracking and rutting in a flexible pavement?
  • A. Vertical subgrade strain
  • B. Tensile strain at the bottom of bituminous layer
  • C. Tensile strain near the surface close to the edge of the wheel
  • D. Vertical sub-base strain
Correct Answer: Option D - Failure criteria in flexible pavement– • A flexible pavement is modeled as an elastic multilayer structure, there are two critical parameters for the design of a flexible pavement. 1. Horizontal tensile strain at the bottom of the bituminous layer or tensile strain near the surface close to the edge of the wheel. 2. Vertical compressive strain at the top of the subgrade layer. Note–These two parameters are considered while designing different layers of the flexible pavement are rutting and cracking (limit) in the bituminous layer and non-bituminous layer respectively.
D. Failure criteria in flexible pavement– • A flexible pavement is modeled as an elastic multilayer structure, there are two critical parameters for the design of a flexible pavement. 1. Horizontal tensile strain at the bottom of the bituminous layer or tensile strain near the surface close to the edge of the wheel. 2. Vertical compressive strain at the top of the subgrade layer. Note–These two parameters are considered while designing different layers of the flexible pavement are rutting and cracking (limit) in the bituminous layer and non-bituminous layer respectively.

Explanations:

Failure criteria in flexible pavement– • A flexible pavement is modeled as an elastic multilayer structure, there are two critical parameters for the design of a flexible pavement. 1. Horizontal tensile strain at the bottom of the bituminous layer or tensile strain near the surface close to the edge of the wheel. 2. Vertical compressive strain at the top of the subgrade layer. Note–These two parameters are considered while designing different layers of the flexible pavement are rutting and cracking (limit) in the bituminous layer and non-bituminous layer respectively.