QUESTION
Objective Question
The critical combination of stresses for corner region in cement concrete roads is
Answer
( Option C)
load stress + warping stress
Solution
The corners of a concrete slab are completely free to expand and contract. Because there is
no restraint against the subgrade at the corners, frictional stress is always zero
At night, the slab corners warp upward (leaving them unsupported). When a heavy wheel
load acts on this unsupported corner, both load stress and warping stress cause maximum
tension at the top fiber.
Therefore,
Critical Corner Stress = Load Stress + Warping Stress
