Abstract
In order to analyze the anti-reflective cracking performance of a full-depth asphalt pavement and study the propagation process of a reflection crack and its influencing factors, a mechanical model of pavement structural crack analysis was established based on the ABAQUS finite element software and the extended finite element method (XFEM). Based on two different loading modes of three-point bending and direct tension, the propagation process of a reflection crack is analyzed. The results show that the anti-reflective cracking performance of a full-depth asphalt pavement is better than that of a semi-rigid base pavement structure, and the loading mode II based on direct tension is more consistent with the propagation mechanism of pavement reflection cracks, while the loading mode II is more suitable for analyzing the anti-reflective cracking performance of the pavement structure. Appropriately reducing the elastic modulus of the stress-absorbing layer can significantly improve the anti-reflective cracking performance of the full-depth asphalt pavement.
Highlights
Most of the asphalt pavement of high-grade highways in China adopts a semi-rigid base structure with enough strength and rigidity, good integrity, strong diffusion stress ability and good water stability, which can ensure the stability of the base [1,2,3]
As a kind of thick asphalt concrete pavement structure with a broad development prospect in recent years, the full-depth asphalt pavement [15,16,17,18] has unique advantages compared with other types of pavement, which are generally made of modified asphalt and recycled asphalt [19,20,21] as pavement asphalt materials
Structures I, II and III refer to a full-depth asphalt pavement, and structures IV and V refer to a general semi-rigid base asphalt pavement
Summary
Most of the asphalt pavement of high-grade highways in China adopts a semi-rigid base structure with enough strength and rigidity, good integrity, strong diffusion stress ability and good water stability, which can ensure the stability of the base [1,2,3]. Sang Luo et al [31] established the finite element model of crack propagation of an epoxy asphalt concrete pavement and carried out the numerical simulation combined with the virtual crack extension approach. They analyzed the cracking process by stages and provided the equation describing the relationship between the J-integral and displacement. According to the basic theory of fracture mechanics and the finite element model, Hongbing Guo and Shuanfa Chen [32] simulated the propagation path of a reflection crack on an Open-graded Large Stone asphalt Mix (OLSM) pavement, analyzed the influencing factors of the path and proposed a method to prolong the life of this pavement. This paper has a guiding significance for the selection of full-depth asphalt pavement structures and the mix design of the stress-absorbing layer
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