沥青路面渗水性能测试研究

Study on Permeability Test of Asphalt Pavement

采用改进的渗水系数测试试验对湖南省在建高速公路沥青路面进行渗水系数测试。根据测试结果结合沥青路面渗水性能的评价方法对沥青路面各面层的渗水性能进行评价分析,得出了沥青路面不同沥青混合料类型的渗水性能差异,提出了沥青混合料不同公称最大粒径的沥青混合料路面检验用的建议指标。最后对路面结构层的透水性能的差异性进行了定性分析,分析表明:沥青路面各面层的渗水性表现出很大的变异性;粗粒式沥青混合料类型更易渗水;粗粒式沥青混合料掺入抗车辙剂其渗水性能会有所降低;渗水系数随着面层厚度的增加而增大;施工质量变异性造成了渗水系数沿路面横向的分布表现为超车道大于行车道。

In order to study the permeability of pavement, an improved method for testing the infihration coefficient of pavement was adopted into a section of expressway under construction in Hunan province. According to the test result and with combination of the evaluation method, the permeability of each surface course in asphalt pavement was evaluated and analyzed. The differences of permeability of different asphalt mixtures for asphalt pavement were obtained. On this basis, the suggested guidelines of different maximum nominal sizes of aggregate for asphalt pavement permeability test were put forward. Finally, the differences of permeability of different surface courses were analyzed qualitatively. The result shows that （ 1 ） the pemleabilities of different surface courses exhibit a great variability and coarse aggregate asphalt mixture infiltrates easily than medium aggregate asphalt mixture; （2） the permeability of coarse aggregate asphalt mixture which is incorporated with anti-mr agent will decrease slightly; （3） the permeability coefficient increases with the increasing of thickness of surface course; （4） the transverse distribution of infiltration coefficient on pavement is non-uniform which results from the construction variability and the infiltration coefficient of passing lane is higher than that of driving lane.