岩沥青改性沥青混合料疲劳耐久性对比研究

In order to reveal the fatigue durability of asphalt mixture modified by rock asphalt, the fatigue tests under different stress ratios were carried out by Material Test System (MTS-810) of ordinary heavy traffic asphalt mixture, asphalt mixture modified by SBS, asphalt mixture modified by rock asphalt. S-N fatigue equations were established of the three kinds of asphalt mixture. The fatigue test results of the three asphalt mixtures were compared. In the same stress ratio test conditions, the fatigue life of the biggest one is the asphalt mixture modified by rock asphalt, the fatigue life of the minimum one is the ordinary heavy traffic asphalt mixture. The S-N fatigue equation parameter k value is the largest, n value is the minimum one to the asphalt mixture modified by rock asphalt. It indicates that the asphalt mixture modified by rock asphalt has the good ability to resist the action of the fatigue load for the aspect of the two fatigue equation parameters k and n. The attenuation amount of the fatigue life is the minimum one for the asphalt mixture modified by rock asphalt under the same increased amplitude of the load level. In the same gradation, asphalt-aggregate ratio and the load conditions , its fatigue durability is the best.