Question

During contraction, _________ are induced in the under-side of the slab.

(a) tensile stress

(b) shearing stress

(c) compressive stress

(d) bulk stress

I got this question in homework.

I would like to ask this question from Design of Rigid Pavements topic in section Design of Flexible & Rigid Pavement of Geotechnical Engineering II

Answer 1

Correct choice is (a) tensile stress

The best I can explain: During contraction, the tensile stresses are induced in the under-side of the slab. This can be visualised by the sagging action of the beam where the under-side is in tension. This is also due to the tensile stresses induced due to the sub-grade friction.