Question

The essential difference between rigid and flexible pavements is
1. Distribution of load over sub-grade
2. Distribution of load over sub-base
3. Materials used
4. Thickness of layers

Answer 1

Correct Answer - Option 1 : Distribution of load over sub-grade

Explanation:

The difference between rigid and flexible pavement is given by:

Flexible pavement	Rigid Pavement
The load is transferred from top to bottom by grain to grain contact.	The load is transferred through slab action
Low or negligible flexural strength.	High flexural strength.
Joints are absent.	Expansion and contraction joints are provided
Low initial cost but high maintenance cost.	High Initial cost but low maintenance cost.
It includes- Surface, base, sub-base, and subgrade layers.	It includes – Concrete slab, base course, and subgrade layers.
Deformation in the top layers is transferred to under- laid layers	Deformation is only in the top layer of the concrete slab.
Less compared to Rigid pavement	Good Night Visibility
Less suitable for stage construction	More Suitable for stage construction.
Very less effect of temperature stress.	Effected by temperature and frictional stresses.
No cross-cutting allow	Allow cross-cutting