级配对应力吸收层沥青混合料性能的影响

Impact of asphalt mixture gradation on stress-absorbing layer performance

为研究混合料级配对富沥青、砂粒式应力吸收层沥青混合料路用性能的影响,提出适于应力吸收层混合料的级配类型;在选用优质高粘性沥青作为结合料的基础上,应用改进的Superpave方法设计了AC、间断、S型和SMA等6种典型级配的应力吸收层混合料,并分别对其疲劳性能、抗拉性能和低温变形性能等进行了室内试验研究。结果表明:AC类级配及间断级配兼顾耐疲劳、常温抗拉和低温变形强等优良力学性能,且对应的混合料沥青结合料含量(质量分数)适中;建议在实际工程应用中,富沥青、砂粒式应力吸收层沥青混合料应尽可能优先选择这两类级配。

In order to study the influences, the favorable gradations are put forward to provide a guidance in road building, the properties of six kinds of stress-absorbing layer mixture with different gradations are studied in the lab. With the same high-viscous-asphalt and improved Superpave mix design method, the fatigue performance and low temperature performance of stress-absorbing layer mixture are tested. The results show that AC-graded and gap-graded stress-absorbing layer mixtures are more flexible at low temperature, they have better tensile performance and fatigue performance. Furthermore, the asphalt content of AC-graded and gap- graded stress-absorbing layer mixtures is not so abundant compared with others. So these two kinds of gradation should be adopted firstly in engineering project. 9 tabs, 1 fig, 9 refs.