基于室内磨耗试验的沥青表面纹理演化规律分析

Evolution Laws of Asphalt Surface Texture Based on Indoor Wear Test

交通量对在役路面抗滑性能衰减及纹理演化影响显著。为研究累积交通量对沥青路表纹理演化规律,采用激光轮廓测量仪采集各类型路面宏微观纹理,选择相应表征参数进行计算,并针对各纹理表征参数进行相关性分析,排除多重线性关系后,选取RMPD、Rsk、Rku以及RSBI作为评价路面抗滑性能指标;以课题组自主研发调试的轮胎-路面动态摩擦测试系统(tire-pavement dynamic friction analyzer,TDFA)为依托模拟不同交通量;利用TDFA进行磨耗试验,对不同交通量下路表纹理参数的演变。研究结果表明:纹理参数在交通磨耗作用下,重载交通出现区间越早,对沥青路面的磨损越严重;中后期出现重载交通则对沥青路面的抗滑性能影响相对较小。

Traffic volume has a significant influence on the attenuation of skid resistance performance and texture evolution of the pavement in service.In order to study the evolution law of cumulative traffic volume on asphalt pavement surface texture,laser profilometer was used to collect the macro and micro textures of various types of pavement firstly,the corresponding characterization parameters were selected to calculate and the correlation analysis on various texture characterization parameters was carried out.After eliminating multiple linear relationships,R MPD,R sk,R ku and R SBI were selected as the evaluation indicators of pavement skid resistance performance.Then,based on the tire-pavement dynamic friction analyzer(TDFA)independently developed and debugged by the research group,different traffic volumes were simulated.TDFA was used to carry out wear test to investigate the evolution of pavement surface texture parameters under different traffic volumes.The research results show that under the effect of traffic wear,the earlier the interval of heavy traffic appears,the more severe the wear on asphalt pavement will be caused by texture parameters.However,heavy traffic in the middle and later stages has relatively little impact on the skid resistance of asphalt pavement.