Pavement Design MCQ with answer and solution

Concept

Warping stresses and joints in concrete pavements

Formula

NONE

Step-by-step solution

1. Concrete pavement design considers environmental warping stresses and joint tie bar placement. 2. Temperature gradients across slab depth cause warping stresses during daily cycles. Answer: A

Explanation

Warping stresses occur because temperature gradients across the slab thickness during the day and night cause differential expansion and curling. Tie bars are provided across longitudinal joints to prevent lane separation, whereas dowel bars are used across transverse joints. Thus, statement i is true and statement ii is false, making option A correct.

Why the other options are wrong

C) Both statements cannot be true because statement (i) is marked false. D) Statement (ii) is true as tie bars are used across pavement joints.

Shortcut

Warping = Daily temp variation; Tie bars = Longitudinal joints (Dowel bars = Transverse).

Common mistake

Assuming tie bars are provided across transverse joints rather than longitudinal joints in concrete pavements.