复合式SMA桥面铺装混合料配比设计及高温抗车辙性能研究

为了提升桥面铺装的高温抗车辙性能,采用马歇尔配合比设计方法对3种SMA沥青混合料分别进行级配设计及体积指标验证,选用轮辙试验和车辙试验对所设计的5种复合式SMA桥面铺装结构组合的高温性能评价指标进行测试。结果表明,SMA混合料沥青析漏损失及飞散损失均满足技术要求,SMA具有合理的最大沥青用量,且粘附性良好;提出的5种复合式SMA铺装结构均呈现较好的高温抗变形能力,其中以SMA10和SMA13形成的结构组合抗车辙效果最佳;推荐采用4500次/mm的动稳定度作为复合式SMA桥面铺装结构的高温抗车辙控制指标。

Mix design and high temperature anti-rutting performance of composite SMA bridge deck pavement

In order to improve the high temperature anti-rutting performance of the bridge deck pavement, the Marshall mix design method is used to carry out the gradation design and volume index verification for three kinds of SMA asphalt mixtures. Wheel rutting test and rutting test are selected to test the high temperature performance of five kinds of composite SMA bridge deck pavement. The results show that the leakage loss and dispersion loss of SMA mixture asphalt meet the technical requirements, and SMA has reasonable maximum asphalt content and good adhesion. The five proposed composite SMA pavement structures have good high temperature deformation resistance, and the combination of SMA10 and SMA13 has the best rutting resistance. The dynamic stability of 4500 times/mm is recommended as the high temperature rutting resistance control index of composite SMA bridge deck pavement.