沥青混合料常应变小梁弯曲疲劳试验

Fatigue Properties of Asphalt Mixtures by Controlled-strain Testing

沥青混合料耐疲劳性能是影响沥青路面使用寿命的关键因素。对AC13、AC20、ATB25三种类型沥青混合料试件进行了常应变三分点小梁弯曲疲劳试验,分析了温度、加载频率、级配类型等对沥青混合料疲劳性能的影响规律。研究表明:密实型沥青混合料由于含有较多的沥青胶浆,其疲劳性能一般较嵌挤型沥青混合料更好;在应变控制模式下,沥青混合料的疲劳寿命随温度的升高而显著延长;较低加载频率对沥青混合料的疲劳寿命影响更为显著。

Fatigue performance of asphalt mixtures is a key influence factor to service life of asphalt pavement. Three types of asphalt mixtures（ AC13, AC20, ATB25 ） were tested with the third-point flexure fatigue test of control strain mode. The effects of test temperature, loading frequency and aggregate gradation on the fatigue performance of mixture was analyzed. The results shows that the fatigue performance of framework-dense mix- tures is better than suspend-dense mixtures, the fatigue life of asphalt mixture in higher temperature is more longer than in lower temperature and the loading frequency effects the fatigue performance remarkably.