Study on the interlayer critical response of asphalt pavement with different paving methods based on cohesive zone model

Different paving methods of asphalt layers are the important factors that affect the interlayer performance and mechanical response of asphalt pavement structure. In order to further analyse the influence of different paving methods on the mechanical properties of asphalt structural layers, four kinds of asphalt pavement with different paving methods were selected as the research objects, namely continuous paving, discontinuous paving (tack coat), discontinuous paving (tack coat + dust), discontinuous paving (no tack coat). Firstly, the interlayer adhesion of asphalt pavement with different paving methods was studied by using the cohesive zone model (CZM). Secondly, different braking modes were selected to apply loads on asphalt pavement to explore the changing law of mechanical response of asphalt pavement under different braking modes. The test results show that the asphalt pavement with continuous paving has the strongest resistance to interlayer adhesion failure, while the asphalt pavement with discontinuous paving (no tack coat) has the weakest resistance to interlayer adhesion failure. In the braking state, the interlayer adhesion of the leading edge of the wheel track on asphalt pavement is most likely to fail, while the trailing edge of the wheel track is most likely to produce the transverse crack.