不同设计目标下沥青混合料的疲劳性能

Fatigue Performance of Asphalt Mixtures with Different Design Goals

摘要:

选用目前最为先进与常用的4点弯曲疲劳试验，对常用的包括70#基质沥青和常用的改性沥青在内的10种沥青混合料进行了15 ℃及1 000×10-6应变控制下的疲劳试验，并进行二次疲劳试验，兼顾了改性沥青的自愈合效果，完成了相同沥青用量下和相同体积设计目标下的各沥青混合料的疲劳性能对比，以及针对相同高温性能和疲劳性能的双向分级，以提供实际工程时混合料设计之前的参考，最后还依据所有试验数据绘制了相应的疲劳性能和高温性能分区散点图以供直观参考.

关键词:改性沥青; 混合料设计; 疲劳性能; 自愈合

Abstract:

10 kinds of asphalt mixtures, including base asphalt and the commonlyused modified asphalt, were researched by fatigue tests by taking selfhealing into account, where fourpoint bending beam(4PB) was selected, at the temperature of 15 ℃ with 1 500×10-6 strain, as well as the second fatigue tests were performed, therefore, the effect of the modified asphalt was considered. Researches were carried out in the same asphalt content, the same volume design goal, fatigue performance were compared, and the same temperature performance classification, the fatigue performance was graded, which was a kind of bidirectional hierarchical method, providing reference for the design of asphalt mixture in the actual project. Finally, a partition scatterplot was drafted for mix design reference based on the test results.

Key words:modified asphalt; mixture design; fatigue performance; selfhealing