室内成型试件与路面芯样的抗车辙差异性评价

Evaluation of rutting resistance differences of indoor samples and pavement cores

摘要:

为了评价室内成型试件与路面芯样抗车辙能力的差异,利用多轮车辙仪(RLWT)获取车辙变形量,从宏观角度研究室内成型试件与路面芯样的抗车辙能力;采用工业CT获取沥青混合料断面扫描图像,从细观角度探讨室内成型试件与路面芯样的粗集料颗粒与面空隙率沿深度方向的分布状况．结果表明:由于压实方式不同,两种试件的空隙率相差甚大,从而导致其抗车辙能力也有明显差异;路面芯样的粗集料颗粒与面空隙率在深度方向分布的均匀性较差;路面芯样的平均面空隙率及上端的面空隙率明显大于室内成型试件,从细观角度证明了宏观研究成果的准确性．

Abstract:

To evaluate the rutting resistance differences of indoor samples and pavement cores, Rotary Loaded Wheel Tester (RLWT)was used to acquire rutting deformation, and rutting resistance of indoor samples and pavement cores was researched from the macro perspective. Industrial CT was utilized to obtain asphalt mixture sectional scanning images, the distribution along the depth direction of coarse aggregate particles and area porosity of indoor samples and pavement cores from the micro angle were explored. The results show that the air porosity of the two kinds of samples vary greatly due to the different manners of compaction, leading to the significant discrepancy in the capability of rutting resistance. The uniformity of the distribution along the depth of coarse aggregate particles and area porosity of pavement cores are poor, and the average area porosity and area porosity in the upper part of the pavement cores are obviously greater than those of indoor samples, which proves the accuracy of the macro research from the micro perspective.