A composite bridge deck system consisting of an orthotropic steel deck and a normal-temperature-cured reactive powder concrete (RPC) layer is proposed to address the problems of pavement damage and fatigue cracks in steel bridge decks. In this study, a local finite element model of a bridge segment was established using ANSYS to calculate and compare the stress states of four deck systems: normal-temperature-cured RPC composite box girders, high-temperature-cured RPC composite box girders, pure steel box girders, and ordinary concrete composite box girders. Additionally, static load tests were conducted on a scaled local model to validate the finite element results. The results show that the compressive strength, flexural strength, and elastic modulus of the normal-temperature-cured RPC are significantly improved compared with those of ordinary concrete. The maximum tensile stress in the normal-temperature-cured RPC layer reached 6.45 MPa without cracking, which is much higher than the tensile capacity of ordinary concrete, thereby offering a solution to pavement failure. The stress in the steel deck was reduced by more than 80% for both normal- and high-temperature-cured RPC composite decks, which is significantly greater than the reduction achieved by the ordinary concrete composite deck. This substantial stress reduction greatly enhances the fatigue life of the bridge deck. Therefore, the RPC composite deck system can effectively improve the fatigue performance of orthotropic steel bridge decks.
Zhang et al. (Thu,) studied this question.