Testing and Evaluating Fatigue Performance of High-modulus Asphalt

摘要

Along with increasing traffic, rutting has become a type of main damage to asphalt pavement. High-modulus asphalt can probably solve this problem because of its strong anti-rutting ability and its high complex modulus. PR PLASTS (PR.S), rock asphalt, and 15/25# are the three kinds of high-modulus asphalt. In this paper, Dynamic Shear Rheometer (DSR) is used to test fatigue properties. The results shown that, at given conditions, the fatigue performance of PR.S is better than rock asphalt and 15/25# is the worst. Nevertheless, when compared with A-70# and styrene-butadiene-styrene (SBS), they are all worse. By analyzing the influence factors of fatigue performance, the results show that the larger the strain is, the shorter the fatigue life is, and they are double-log related. In a certain temperature range, fatigue performance gets better when the temperature gets higher in the strain-controlled loading mode, and it is the same with the loading frequency. Furthermore, TFOT can severely reduce the fatigue performance of asphalt binder.