ABSTRACT

To provide a reference for the gradation-refined design of asphalt mixtures, pore cellular structure model was developed to evaluate the meso-structure of asphalt mixture, and corresponding meso-structural evaluation indices of the coarse aggregate main skeleton and asphalt mortar interference were obtained. Then three different asphalt mixtures were selected to study the influence of gradation and asphalt mortar performance on the meso-structure of pore cellular structures. The gradual behaviour characteristics of the meso-evaluation indices subjected to load, as well as the correlation between the main skeleton meso-evaluation indices and macro deformation were studied. The results indicated that gradation is a key determinant of the contact point, number of pore cells, and area of pore cell distribution. Under the action of loads, the number of contact points and pore cells within the asphalt mixture increase, interference coefficient decreases, and skeleton rate increases gradually; coarse aggregates with contact that are not involved in the pore cellular structure are the main factor affecting skeleton rate. Meso-structural evaluation indices including interference coefficient and skeleton rate can effectively evaluate the meso-structure of the asphalt mixture, ensure that the coarse aggregates are interlocked with each other to form a stable main skeleton.

摘要

为细化沥青混合料的级配设计提供参考，建立了多孔胞结构模型，评价沥青混合料的细观结构，获得了相应的粗骨料主骨架细观评价指标和沥青砂浆的抗干扰性。然后选择了三种不同的沥青混合料，研究了级配和沥青砂浆性能对孔孔结构细观结构的影响。研究了载荷作用下细观评价指标的渐进行为特征，以及主骨架细观评价指标与宏观变形之间的相关性。结果表明，渐变是接触点，孔细胞数量和孔细胞分布面积的关键决定因素。在负载作用下 沥青混合料中的接触点和孔单元数量增加，干扰系数降低，骨架速率逐渐提高。接触的粗聚集体不参与孔的细胞结构是影响骨架速率的主要因素。包括干扰系数和骨架率在内的细观结构评价指标可以有效地评价沥青混合料的细观结构，确保粗骨料彼此互锁，形成稳定的主骨架。