Abstract
In this paper, the effect of artificial cavity beneath concrete slab on the mechanical behaviors of concrete pavement was discussed based on the results of FWD tests. Traffic loading was repeatedly applied to the pavement, and then the change of deflection and flexural strain at the bottom of the slab were evaluated by FWD. The following results were obtained from the tests. 1) Increasing rate of the deflection and the flexural strain due to cavity was larger at the edge of slab than at the center of slab. 2) Crack generated by traffic load was only observed at the bottom of the slab edge. On the basis of the test results, the authors indicated the possibility that cavity beneath slab edge had greater effect on soundness of pavement than cavity beneath the center of slab.
