沥青路面抗车辙性能评估与结构优化研究

Study on Rutting Resistance Evaluation and Structural Optimization of Asphalt Pavement

为了研究路面结构对车辙性能的影响,通过试验的方式对路面结构进行加强,分别对路面结构上层和中层进行加强,并对试验路面进行重载车辙试验与剪应力试验。结果得出:低速行驶的车辆对路面的车辙深度更深,并且随着车辆的荷载增加,车辙深度也会增加;通过加强路面的上层和中层,可以使路面的抗车辙能力提升,并且加强路面上层和中层的提升能力相差不多,最终得出由抗车辙功能性沥青混合料、密级配SBS改性沥青混合料、密集配普通沥青混合料三种材料的组合为最优方案。对路面进行加强、路面的抗剪能力的提升并不明显。

In order to study the influence of pavement structure on the rutting performance, the pavement structure is reinforced through the test method. The upper and middle layers of pavement structure are reinforced respectively. The heavy load rutting test and shear stress test are carried out for the tested pavement. The result shows that the vehicles traveling at low speeds have deeper ruts on pavement. And with the load increase of vehicles, the rut depth also increases. By reinforcing the upper and middle payers of pavement, the rutting resistance of pavement can be improved. The improvement of the upper and middle layers of pavement is similar. Finally, the best scheme composed of three materials of rutting resistance asphalt mixture, dense gradation SBS modified asphalt mixture and dense gradation common asphalt mixture is obtained. The improvement of shear resistance of pavement is not obvious if the pavement is reinforced.