Relationship between surface microtexture of asphalt pavement and its skid resistance

设计和施工良好的沥青路面可以提供安全耐用的高防滑表面。路面表面特征与其包含各种波长范围的整体纵剖面有关。波长范围短于10^<-3> ~ 10^<-4>m，通常被称为“微纹理”，它与表面的抗滑性有关。许多关于路面/轮胎相互作用的研究工作已经开展，然而，其中很少涉及实际测量的微纹理，包括波长10^<-5>m。本研究的目的是获得精确的微观纹理路面表面首先作为纵向轮廓使用激光型proflometer。测量间隔为10μm (=10^<-5>m)，长度为20 mm。同时，防滑性是用DF测试仪测量的，DF测试仪最近被ASTM作为标准测试仪使用。利用传统的FFT和功率谱密度（psd）对测量剖面进行了分析，并利用分形维数的概念进行了分析。同时，对同样的剖面进行了小波分析，作为数字信号处理在各个研究领域都很受关注。最后，讨论了所测防滑阻力与分析结果之间的关系。结果表明，小波分析的影响范围为0.08 ~ 0.32 mm， FFT分析的影响范围为0.01 ~ 1 mm（224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).