沥青稳定碎石抗疲劳性能研究

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JTGF40—2004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。

Study on Anti - Fatigue Performance of Asphalt Treatment Base

Three-point bending fatigue test was used to study on the anti - fatigue performance of asphalt treatment base and analysed the effect of the different design method and maximum normal size on fatigue performance.The results showed that the fatigue performance of asphalt mixture was better designed by Super-pave method,but it was sensitive to stress.The fatigue performance of the intermediate of standard recommend was as well as that of asphalt mixture designed by Baley.But the mixture designed by Babey was not sensitive to stress.The anti - fatigue performance of mixture that were small in size,higher in fine aggregate content,uniform and close-grained was well.The design procedures had significant effect on n and k value,maximum normal size and reciprocity between maximum normal size and design method had small influence.