Question

Consider the following statements regarding pavements:

(i) Rigid pavements have good night visibility than flexible pavements.

(ii) It is possible to make cross-cutting of the rigid pavement.

(iii) In a flexible pavement, any deformation in the top layers is transferred to the under-laid layers; but, in rigid pavements, there is slab or beam action due to which any deformation is only in the top layer of the concrete slab.

Which of the above statements are correct?

1. (i) and (ii)
2. (ii) and (iii)
3. (i) and (iii)
4. (i), (ii) and (iii)

Answer 1

Correct Answer - Option 4 : (i), (ii) and (iii)

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.
More suitable for stage construction	Less Suitable for stage construction.
Very less effect of temperature stress.	Effected by temperature and frictional stresses.

Reference

IRC  37  2018 (page 25)

https://www.manuneethi.in/uploads/files/books/IRC-37-2018.pdf

Stage construction is not allowed for pavements with cement treated bases and sub-bases.