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采用材料试验系统MTS810进行小梁应力疲劳试验,通过对中面层采用的级配AC-20、LAC-20和SAC-20沥青混合料改性前后的耐疲劳性能进行对比分析发现:除级配SAC混合料外,级配LAC和级配AC混合料改性后的抗疲劳性能均有提高,在相同应力比情况下,级配LAC混合料改性后其抗疲劳性能提高显著。在一定应力水平作用下,随着应力比的提高,载重量的增大,级配LAC混合料改性后的疲劳寿命增加的幅度逐渐减小,在较低应力比情况下,其抗疲劳性能明显增强。荷载应力水平不同,改性沥青混合料疲劳寿命提高的倍数不同,基本随着荷载应力水平的提高,疲劳寿命提高的倍数逐渐减小。
By using the material testing system MTS810 to carry out the trabecular stress fatigue test, through the comparative analysis of fatigue resistance before and after the modification of asphalt mixture used in the middle layer, the grading AC-20, LAC-20 and SAC-20 found that: SAC mixture, the modified LAC and graded AC mixture have improved fatigue resistance, and the fatigue resistance of the LAC mixture has been significantly improved at the same stress ratio. Under the action of certain stress level, with the increase of stress ratio and load, the increase of fatigue life after the modification of LAC mixture gradually decreases. At lower stress ratio, its fatigue resistance Significantly enhanced. The load stress levels are different, the fatigue life of modified asphalt mixture to improve the multiple of the basic with the increase of the load stress level, the fatigue life increase of the fold decreases.