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Question
Which of the following is a characteristic of rigid pavements?
A.
It cannot resist tensile stresses.
B.
In design of rigid pavements, the strength of sub grade is most important 
C.
Its failure is usually due to movement of subgrade
D.
It produces heavy temperature stresses.
Answer ( Option D)

It produces heavy temperature stresses.

Solution

Rigid Pavement
• Rigid pavement is constructed from Portland Cement Concrete (PCC) and generally consists of three layers, including the subgrade, base course, and surface course.
• These pavements have high flexural strength and rigidity.
• In this pavement, the load gets distributed through slab action. The pavement acts like an elastic plate.
• The pavement materials are laid directly on the prepared subgrade or on top of a single granular layer of the stabilized surface.
• There is no requirement for a sub-base layer in rigid pavements.
• Heavy stresses are produced due to temperature variations.
• It has a high initial cost.
• The load gets distributed by slab action.
• It has a high flexural strength.
The following 5 forms of failures are commonly found in rigid pavement
1. Scaling of cement concrete
2. Shrinkage cracks
3. Joint spalling
4. Warping cracks
5. Pumping

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