ABSTRACT

This paper presents a laboratory study aiming to characterise the influences of aggregate micro-texture on the skid resistance under consideration of different wavelengths. To achieve this objective, 11 kinds of aggregates were used to prepare aggregate specimens. Micro-Deval (MD) and Aachen Polishing Machine (APM) were utilised to represent the changes in aggregate morphology which is caused by traffic loading. The Wehner/Schulze (W/S) test was used to measure the skid resistance. A high-resolution profilometer was utilised to collect the surface topography of the specimens. The two-dimensional power spectral density of the aggregate specimens was calculated based on the collected surface topography to investigate the differences in texture resulting from abrasion and polishing. Furthermore, the key wavelength ranges of the pavement surface texture responsible for the skid resistance is identified. The key wavelength range was then divided into four subranges; thereafter, the effect of the micro-texture on the skid resistance is investigated. Analyses show that the MD and APM affected different wavelength ranges of the texture. The most influential wavelength range for the skid resistance is found to be 32–128 µm. Mineral properties and the composition of aggregate directly affect the skid-resistant performance as well as the polishing resistance.

摘要

本文提出了一项实验室研究，旨在表征在考虑不同波长的情况下骨料微纹理对防滑性能的影响。为了达到这个目的，使用了11种骨料来制备骨料标本。使用Micro-Deval（MD）和Aachen抛光机（APM）来表示由交通负荷引起的聚集体形态变化。Wehner / Schulze（W / S）测试用于测量防滑性能。高分辨率轮廓仪用于收集样品的表面形貌。根据收集的表面形貌计算聚集体样品的二维功率谱密度，以研究磨蚀和抛光导致的质地差异。此外，确定负责防滑的路面表面纹理的关键波长范围。然后将关键波长范围划分为四个子范围：此后，研究了微织构对防滑性能的影响。分析表明，MD和APM影响纹理的不同波长范围。防滑的影响最大的波长范围是32–128 µm。矿物质的性质和骨料的组成直接影响防滑性能以及耐抛光性。防滑的影响最大的波长范围是32–128 µm。矿物质的性质和骨料的组成直接影响防滑性能以及耐抛光性。防滑的影响最大的波长范围是32–128 µm。矿物质的性质和骨料的组成直接影响防滑性能以及耐抛光性。