ABSTRACT

The asphalt pavement texture is vertical asymmetric, and the tread rubber may contact part of pavement surface. Therefore, the tread penetration depth (d) is probably essential for developing a reliable relationship between pavement performance and texture. This study investigated the effect of pavement on d, and simplified the contact by squeezing a rubber plate into three-dimensional (3D)-printing specimens. The 44 specimens were manufactured based on the surface morphologies of pavements and artificial surfaces with characteristics of pavement texture. The specimens’ surfaces were characterised by parameters from ISO-25178. A set of self-designed fixture was mounted on a loading machine to exert precise force. The contact area was recorded by leaving the stain attached to the rubber plate on the specimens’ surface. The value of d was obtained based on the specimens' Abbott–Firestone curves and the measured contact area. The results showed that the parameters focusing on the top topography of the pavement surface always exhibited a strong positive correlation with d. Furthermore, the parameter representing the volume of peak material showed almost the strongest linear relationship with d. The intercept and slope of the linear equations increased with the increase in the loading pressure or decline in the rubber hardness.

摘要

沥青路面纹理垂直不对称，胎面胶可能接触部分路面。因此，胎面穿透深度 ( d ) 可能对于在路面性能和纹理之间建立可靠的关系至关重要。本研究调查了路面对d的影响，并通过将橡胶板挤压成三维 (3D) 打印样本来简化接触。44个试件是根据路面和具有路面纹理特征的人造表面的表面形态制作的。试样的表面由 ISO-25178 中的参数表征。一套自行设计的夹具安装在装载机上，以施加精确的力。通过将污渍附着在试样表面的橡胶板上记录接触面积。d值是根据试样的 Abbott-Firestone 曲线和测量的接触面积获得的。结果表明，关注路面表面形貌的参数始终与d呈强正相关关系。. 此外，代表峰物质体积的参数与d几乎呈现出最强的线性关系。线性方程的截距和斜率随着加载压力的增加或橡胶硬度的下降而增加。