关键词: 道路工程；聚氨酯超薄磨耗层；抗滑性能；动摩擦系数；宏观纹理；回归分析

Abstract: In order to study the slip resistance of polyurethane ultra-thin wear layer, the dynamic wear test and laser profile scanning test were combined to investigate the factors affecting the decay of the slip resistance of the wear layer and the evolution of the macroscopic texture characteristics of the road surface during this process. Through dynamic wear tests, the variation rule of dynamic friction coefficient (fDFC) changing with the wear time under different working conditions was analyzed. By means of laser profile scanning test, the surface elevation information of the wear layer was obtained, and the macroscopic texture index was calculated. Based on the correlation analysis of the indexes and the significance analysis of the regression equation, the relationship between the anti-slipping performance of the wear layer and the macroscopic texture was revealed. The research results show that the velocity, load, and aggregate mass loss all have an impact on the slip resistance of the wear layer. When velocity and load are taken as variables respectively, fDFC shows an exponential type of attenuation generally, and higher velocity and greater load will aggravate aggregate spalling, resulting in more easy decay of the slip resistance of the wear layer. 5 indexes such as the mean profile depth (hMPD), profile arithmetic average wavelength (λa), surface bearing index (kSBI), the newly introduced mass loss rate of the wear layer aggregate stage (σ) and stage total mass loss rate (ω) can establish a significant multivariate quadratic polynomial relationship with the slip resistance of the wear layer, which indicates that macroscopic texture and aggregate mass loss can accurately describe the slip resistance of the wear layer.

Key words: traffic engineering; polyurethane ultra-thin wear layer; slip resistance; dynamic friction coefficient; macroscopic texture; regression analysis