There are some kinds of serious distresses in deck pavement of many long span steel bridges at their early operation stage, such as high-temperature rutting and fatigue. The key issue is that the current asphalt mix design method only overemphasizes the importance of high temperature performance and neglects other properties of the pavement. In order to establish a design method of durable asphalt mixture in deck overlay based on balance performance, this paper selected three key factors of void ratio, asphalt content and stain level to design a uniform test for fatigue and high-temperature performance of modifier asphalt mixtures with 8% SBS additive by four-point flexure beam fatigue test and rutting test. The MATLAB software was used to carry out regression analysis of the fatigue and rutting test results, respectively. When the requirements of fatigue life, dynamic stability and strain level of a long span steel bridge were obtained, the predicted values of air void and asphalt content of the deck overlay could be reckoned using fatigue and rutting regression equations. A design method for inverse calculation of volume index of asphalt mixture based on performance requirements was established. The entity project showed that there was good fatigue and excellent high temperature performance in steel bridge deck pavement by using the design method, which verified the feasibility of the method.

Hot asphalt mixture; Uniform design test; Balance design; Regression equation; Fatigue performance; High-temperature performance