论文部分内容阅读
研究采用三点弯曲疲劳试验对沥青稳定碎石进行疲劳性能研究,分析不同设计方法下不同公称最大粒径对混合料疲劳性能的影响。试验结果表明,采用Superpave法设计的混合料抗疲劳性能最好,但对应力的变化较为敏感;依据《规范》推荐的级配中值混合料抗疲劳特性与采用贝雷法设计的混合料的抗疲劳特性相当,但采用贝雷法设计的混合料对荷载应力的敏感度最小;粒径较小、细集料含量较高、均匀密实的混合料抗疲劳性能较好。设计方法对n值和k值有显著性影响,而公称最大粒径及其与设计方法的交互作用对n值和k值影响较小。
The fatigue behavior of bitumen stabilized macadam was studied by three-point bending fatigue test, and the influence of different nominal maximum particle sizes on the fatigue properties of the mixture was analyzed. The test results show that the anti-fatigue performance of the mixture designed by Superpave method is the best, but it is sensitive to the change of the stress. According to the fatigue resistance of the mixture with gradation recommended by the Code and the mixture designed by Bere method However, the mixture designed by Bere method has the least sensitivity to load stress. The smaller the particle size and the higher the fine aggregate content, the better the fatigue resistance of the mixture with uniform density. The design method has a significant effect on the n value and the k value, while the interaction between the nominal maximum particle size and its design method has little effect on the value of n and k.