不同类型沥青混凝土冻融疲劳性能研究

Research on Freeze-thaw Fatigue Performance of Different Types Asphalt Concrete

冬季突遇雨雪天气,在水分和温度的影响与作用下,沥青混凝土路面易产生冻融损害,但目前这方面的研究还很少。因此,根据华东地区的冬季气温,采用间接拉伸疲劳试验研究冻融循环对不同类型沥青混凝土疲劳性能的影响。试验结果表明:在相同的冻融温度和冻融次数下,SBS改性沥青混凝土疲劳寿命高于AH-70号基质沥青混凝土,随着冻融次数的增加,它们的疲劳寿命明显下降,SBS改性沥青混凝土疲劳寿命降低速度低于AH-70号基质沥青混凝土。通过对冻融条件下不同类型沥青混凝土疲劳性能的研究,为提高沥青路面耐久性提供理论依据。

Under the action of moisture and temperature, asphalt concrete pavement are prone to freezing and thawing in severe weather in winter. But there is few current research in this field. According to the winter temperature in east China, indirect tensile fatigue tests were carried out to study the freeze-thaw cycle impact on different types of asphalt concrete fatigue performance. The results show that at the same freeze-thaw temperature and times, SBS modified asphalt concrete fatigue life higher than AH-70 asphalt concrete. And with the increase of freeze-thaw times, the fatigue life decreases obviously, but the reduction speed of SBS modified asphalt concrete fatigue life is lower than AH-70 asphalt concrete. Through researching on performance of different types of asphalt concrete under the repeated freezing and thawing conditions so that providing a theoretical basis for improving the durability of asphalt surface.