Experimental Research on Fatigue Performance of Asphalt-treated Base Mixtures

Abstract

Flexible base asphalt pavements have been used widely in high grade roads in China. The fatigue performance is one of the most important properties for asphalt-treated base mixtures. Firstly, five kinds of asphalt mixtures were tested with the third-point flexure fatigue test under strain controlled mode with the effects of aggregate gradation, asphalt content, asphalt property and test temperature on fatigue performance of asphalt-treated base was analyzed, which can be considered in asphalt-treated base mixtures design. The result shows that the fatigue performance of suspend-dense mixtures is better than framework-dense mixtures. Fatigue life is improved markedly by the increase of bitumen content and the optimal asphalt content (OAC) determined by Marshall method is less than the OAC with best fatigue performance. Fatigue life of asphalt mixture in higher temperature is longer than in lower temperature. The asphalt mixture with modified asphalt is better than ordinary asphalt mixture in terms of fatigue performance.