Ji Weidong, Meng Yunrui, Shang Yunlong, Zhou Xiwei, Xu Huining
School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
Heilongjiang Transportation Investment Group Co., Harbin 150028, China.
Materials (Basel). 2023 Sep 26;16(19):6409. doi: 10.3390/ma16196409.
Of major concern is the lack of correlation between the material design and structural function of asphalt pavement in China. The objective of this paper is to identify the layer in asphalt pavement where permanent deformation occurs most seriously and to propose a control index for that layer's asphalt mixture. The permanent deformation of each layer was determined through the utilization of thickness measurements obtained from field cores. The results indicate that the reduction in thickness is more significant in the driving lane than in the ridge band and shoulder. This phenomenon can be attributed to the intensified densification and shearing deformation that arise from the combined impacts of recurrent axle loads and high temperatures. Compared to surface and base layers, the bearing layer is the primary area of concern for permanent deformation in asphalt pavement. Therefore, it is imperative to incorporate the ability of bearing-layer asphalt mixture to withstand permanent deformation as a crucial design parameter. The dynamic modulus of the bearing-layer asphalt mixture is significantly influenced by the type of asphalt, gradation, and asphalt content, compared to other design parameters. Based on the relationship established between dynamic modulus and dynamic stability, with creep rate as the intermediate term, a control standard was proposed to evaluate the permanent deformation of the bearing-layer asphalt mixture. This study can provide reasonable and effective guidance for prolonging pavement life and improving pavement performance.
中国沥青路面材料设计与结构功能之间缺乏相关性是一个主要问题。本文的目的是确定沥青路面中永久变形最严重的层，并为该层的沥青混合料提出一个控制指标。通过利用从现场芯样获得的厚度测量值来确定各层的永久变形。结果表明，行车道的厚度减小比车辙带和路肩更为显著。这种现象可归因于反复轴载和高温共同作用引起的压实强化和剪切变形。与表面层和基层相比，承重层是沥青路面永久变形的主要关注区域。因此，必须将承重层沥青混合料承受永久变形的能力作为一个关键设计参数。与其他设计参数相比，承重层沥青混合料的动态模量受沥青类型、级配和沥青含量的影响显著。基于动态模量与动态稳定性之间建立的关系，以蠕变率为中间项，提出了一个控制标准来评估承重层沥青混合料的永久变形。本研究可为延长路面寿命和改善路面性能提供合理有效的指导。
