Abstract
High Friction Surfaces (HFS) are applied to increase friction capacity on critical roadway sections, such as horizontal curves. HFS friction deterioration on these sections is a safety concern. This study deals with characterization of the aggregate loss, one of the main failure mechanisms of HFS, using texture parameters to study its relationship with friction. Tests are conducted on selected HFS spots with different aggregate loss severity levels at the National Center for Asphalt Technology (NCAT) Test Track. Friction tests are performed using a Dynamic Friction Tester (DFT). The surface texture is measured by means of a high-resolution 3D pavement scanning system (0.025 mm vertical resolution). Texture data are processed and analyzed by means of the MountainsMap software. The correlations between the DFT friction coefficient and the texture parameters confirm the impact of change in aggregates’ characteristics (including height, shape, and material volume) on friction. A novel approach to detect the HFS friction coefficient transition based on aggregate loss, inspired by previous works on the tribology of coatings, is proposed. Using the proposed approach, preliminary outcomes show it is possible to observe the rapid friction coefficient transition, similar to observations at NCAT. Perspectives for future research are presented and discussed.
Highlights
The High Friction Surface (HFS) has been used as one of the low-cost safety countermeasures to address high friction demand concerns on curved roadways
A texture analysis was conducted to characterize the variation of highfriction surfaces (HFS) over time and interpret their friction deterioration
Preliminary findings from the correlation analysis and analysis of variance (ANOVA) reveal (a) texture parameters related to asperities’ height, shape, and material volume show reasonable correlation with friction, (b) texture parameters related to density, projected area, and void volume show correlation, but the trend is contrary to what is expected, and (c) density (Sds), average asperity slope (Sdq), and average asperity curvature (Ssc) are promising texture parameters to distinguish the different aggregate loss severity levels
Summary
The High Friction Surface (HFS) has been used as one of the low-cost safety countermeasures to address high friction demand concerns on curved roadways. It was developed in the 1960s in the UK by the Greater London Council and the Transport and Road Research Laboratory to restore friction on high-crash road sections [1]. HFS is applied as a thin coating (compared to the thickness of a pavement) on an existing road surface It is composed of a layer of wear-resistant aggregate like calcined bauxite bonded to the pavement surface with polymer resin binder. This situation causes significant safety concern because transportation agencies cannot reliably predict the friction deterioration and plan for timely actions to miti-
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