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

摘要： 为研究聚氨酯超薄磨耗层的抗滑性能，采用动态磨耗试验与激光轮廓扫描试验相结合的方法，探讨磨耗层抗滑性能衰变的影响因素和该过程中路表宏观纹理特征的演化。通过动态磨耗试验，分析了在不同工况下动摩擦系数(fDFC)随磨耗时间的变化规律及其影响因素；通过激光轮廓扫描试验，获取了磨耗层表面高程信息，计算了宏观纹理指标；并基于指标间的相关性分析和回归方程显著性分析，揭示了磨耗层抗滑性能与宏观纹理的关系。研究结果表明：速度、荷载和骨料质量损失均会对磨耗层抗滑性能产生影响，在分别以速度、荷载为变量时，fDFC总体呈指数型衰减，且较高速度和较大荷载会加剧骨料剥落，导致磨耗层抗滑性能更易衰变；宏观纹理中的平均断面深度(hMPD)、轮廓算术平均波长(λa)、表面磨损指数(kSBI)和新引入的磨耗层骨料阶段质量损失率(σ)、阶段总质量损失率(ω)这5个指标可与磨耗层抗滑性能建立显著的多元二次多项式关系，表明宏观纹理与骨料质量损失能准确地描述磨耗层的抗滑性能。

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