Moisture Stresses of Semirigid Base at Hardening Stage During Construction

Abstract:

In terms of semirigid base cracks induced by moisture change at hardening stage during construction, the shrinkage stress and curling stress were discussed in related to the factors of dry shrinkage strain, horizontal friction stiffness and vertical reaction modulus by using an elastic foundation beam model. The results show that the shrinkage stress ratio grows with increase of the horizontal friction stiffness in “S” trend and gradually converges to 1; whereas the curling stress ratio is the function of L/r (the ratio of the length and stiffness of the beam radius) with increase of L/r，firstly grows up and slightly exceeds 1 then comes down to 1. In the end, the moisture stresses for a group of cement stabilized aggregate with ordinary cement content are calculated, based on the crack criterion, it is easily judged that the premature cracking on cement stabilized aggregate base would be induced at hardening stage.