Experimental Study on Durability of Hot Asphalt Mixture in Bridge Deck Pavement Based on Uniform Design

Long-span steel bridges experience deck pavement distresses during early operation, such as high-temperature rutting and fatigue. Current asphalt mix design overemphasizes high temperature performance, neglecting other properties. Designing a method of durable asphalt mixture in deck overlay based on balanced performance, this paper selected three factors (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 and rutting tests. Regression analysis of results was performed via MATLAB. When requirements of fatigue life, dynamic stability, and strain level of long-span steel bridges were obtained, predicted values of air void and asphalt content were reckoned using fatigue and rutting regression equations. A method for inverse calculation of volume index of asphalt mixture based on performance requirements was established. The project showed good fatigue and excellent high temperature performance using the design, verifying feasibility.