Abstract
The contact state between layers of asphalt pavement not only has a significant effect on the mechanical response of road structure but is also the bottleneck of research on the mechanical behavior of pavement structure at present. In this paper, the effects and laws of different water–salt entry modes, salt solution concentrations, and temperatures coupling on the contact state between base and surface layers are studied by a 45° inclined shear test. The simulation and verification of each working condition are carried out by ABAQUS (Dassault, Paris, France) the friction coefficient between layers is reversed, and the actual contact state between layers is characterized in order to realize comprehensive evaluation and reasonable expression. The results show that different modes have different effects on contact characteristics. At the same temperature and concentration of the salt solution, bonding of water and salt erosion is the best, followed by direct erosion, with the worst being from bottom to top, and the interlayer bonding condition is weakened with increase in temperature. The relative accuracy of the software simulation and test analysis was as high as 92% and the friction coefficient of the water-free salt erosion test piece was found to be about 0.85 at 25 °C, while after the bottom-up erosion of the 14% salt solution the friction coefficient was found to be about 0.43, which indicates that the corrosion of the water–salt will have a great effect on the bonding condition between the structural layers of the road.
Highlights
Asphalt concrete pavement is the most commonly used road structure of highways at all levels [1], and has the advantages of being energy saving and emissions reducing, being low cost, having convenient maintenance, and so on [2]
Stage,show which of the shearinstress-displacement obtained from the experiment not change included in the of this study, the interlaminar shear stress valueexperience at the end four of this thewas same rule: thescope interlaminar shearand stress-displacement curves roughly stages in the 45° shear test
As the curvature of the curve was found to be equal to the corresponding interlaminar shear modulus of shown in Figure 4, the curvature of the curve was found to be equal to the corresponding the base surface
Summary
Asphalt concrete pavement is the most commonly used road structure of highways at all levels [1], and has the advantages of being energy saving and emissions reducing, being low cost, having convenient maintenance, and so on [2]. The pavement is composed of multiple layers affected by a combination of traffic load and climate change [3], and poor interlayer bonding of asphalt pavement will lead to structural problems, such as slippage, delamination, and top-down cracking [4]. The continuous evolution and deterioration of the contact state between layers are the main reasons for aggravating the development of fatigue damage and permanent deformation of asphalt pavement [5]. It is important to pay more and more attention to the contact state between layers in the whole life cycle of asphalt pavement. The concept of the influence of interlaminar contact state on pavement was first put forward at the first International Conference on Asphalt Pavement Structure Design in 1962. Livneh suggested that the change of the contact state between layers may affect the stress distribution of asphalt pavement
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