Thin Cement Concrete Pavement Load Stress Analysis

Ultra-Thin Whitetopping Pavement is a recently developed,low-cost, effective, quickly and fairly simple rehabilitation technique in which a 50 to 100mm thick layer of high-early strength, fiber-reinforced concrete is placed over a milled surface of distressed asphalt concrete pavement. Since the Louisville UTW experiment, although, some UTW experimental projects have been built in United State, the loading stress of UTW pavement has not been analyzed by theoretical calculation.In this paper, A three dimensional finite element analysis has been used to analyse the loading stress of UTW pavement. The critical loading position of UTW plate and the rules of the effect of the joint spacing of plate, the thickness of overlay, Ec/Es and the interface conditions between concrete overlay and existing AC on the stress are provided. The effects of the existing asphalt layer on the stress of UTW have been analyzed in elastic three layer system. On the basis of a great deal of calculation, a simple and rational calculation method of the loading stress of UTW Pavement is brought forward. In the end, first UTW experimental project in China is introduced.