Relationship between surface microtexture of asphalt pavement and its skid resistance

精心设计和建造的沥青路面可以提供安全耐用的高防滑表面。路面特性与其包含各种波长范围的总体纵向轮廓有关。在10 <-3>~ 10 μ <-4>m波长范围内的微结构通常被称为“微结构”，它与路面的抗滑性能有关，人们对路面/轮胎的相互作用进行了大量的研究，但很少有人对10 μ m波长范围内的微结构进行实际测量<-5>。以10μm（=10 μ m）的间隔对20 mm进行测量<-5>。采用美国材料试验协会（ASTM）最近采用的标准试验机DF试验机对沥青路面的抗滑性能进行了测试，并对测试结果进行了FFT和PSD分析，同时还利用分形维数的概念对测试结果进行了分析。同时，利用近年来在数字信号处理等领域得到广泛应用的小波分析方法，对相同的纵断面进行了分析，并对分析结果与实测抗滑性能之间的关系进行了讨论。作为结论，从小波分析发现最有影响的波长范围是0.08 - 0.32 mm，从FFT分析发现最有影响的波长范围是0.01 - 1 mm（224个字）。

Well designed and constructed asphalt pavements can provide safe and durable surfaces with high-skid resistance. Pavement surface characteristics are related to their overall longitudinal profiles that contain various wavelength ranges. The range of wavelength, shorter than 10^<-3>〜10^<-4>m, is often referred to as "microtexture" and it is related to skid resistance of the surface.Many research works have been carried out about the pavement/tire interactions, however, very few of them have dealt with actually measured microtexture including the wavelength of 10^<-5>m.The aim of this research is to acquire precise microtextures of pavement surfaces first as longitudinal profiles using a laser type prof lometer. The measurements were done for 20 mm at the interval of 10μm (=10^<-5>m). And also, skid resistance was measured using DF tester, which was recently employed as a standard tester by ASTM.The measured profiles ware analyzed using conventional FFT and PSDs (Power Spectrum Density) and were also analysed using the concept of fractal dimension. At the same time, wavelet analysis, which has been highlighted in various research filed as digital signal processing, was performed on the same profiles.Finally, the relationship between the measured skid resistances and the results of the analyses were discussed. As a conclusion, the most influential wavelength range was found to be 0.08〜0.32 mm from the wavelet analysis and 0.01〜1 mm from the FFT analysis (224 words).