Matter-elements analysis Method in Evaluation of Voids beneath Concrete Slabs Based on FWD Test

摘要

Multi-level loading method is often used to evaluate voids beneath concrete pavements. However, there might exist misevaluation if the evaluation is based on a single parameter or index, such as maximum deflection, slope and intercept of FWD load-deflection regression curve or joint loadtrausfer efficiency. This paper proposes a matter-elements-analysis method for evaluating voids beneath concrete slabs based on FWD test. A matter-element model is formulated based on the voids state beneath concrete slabs, its evaluation index and characteristic values of both. This paper aims to evaluate void condition of concrete comprehensively by various indexes based on correlative analysis. Several actual roads cases showed that this model could determine the void condition of concrete slabs objectively and accurately, which provided a scientific foundation for the treatment of voids beneath concrete pavement in practice.