CZM analysis and evaluation of influencing factors on interlayer adhesion of asphalt mixture with double-layer continuous pave

Abstract

Abstract The new type of double-layer continuous paving can effectively improve the interlayer adhesion of asphalt mixture and the comprehensive performance of asphalt pavement. However, in the actual process of double-layer continuous paving, the interlayer adhesion of asphalt mixture is affected by many factors (compaction function, construction temperature, process, etc). Therefore, the finite element software (ABAQUS) was used to carry on the three-dimensional modeling of the asphalt pavement, and cohesive zone model (CZM) was used to define the interlayer adhesion of the asphalt mixture to analyze the factors affecting the interlayer adhesion of continuous paving. This paper mainly discusses the influence of different underlayer compaction degree, underlayer compaction temperature, asphalt layer thickness and load action on interlayer bonding and mechanical response. Finally, the grey correlation theory was used to rate the different influencing factors. The results show that when the lower layer is compacted for 50 times, the interlayer adhesion of asphalt pavement is the best, and the ability to resist the displacement crack is the strongest. Increasing the thickness of the upper layer and the compaction temperature of the lower layer of the asphalt pavement can improve the interlayer adhesion and reduce the displacement cracks. At the same time, it is found that the number of precompaction times of lower layer and horizontal braking force are the main factors that affect the interlayer adhesion. The research results have certain theoretical and practical value for the construction technology of double-layer continuous paving of asphalt pavement.