Evaluating the Sensitivity of the Auckland Pavement Polishing Device and Analysis of Aggregate Microtextural Wear
type: CreativeWork
description: Skid resistance is a key factor in road safety. However, over time, the pavement surface is polished by vehicle tyres, reducing the micro-texture of aggregates and macro-texture of the road surface, resulting in a deterioration of skid resistance. Consequently, it is necessary to be able to accurately predict the skid resistance performance of aggregate as part of the design process. Laboratory tests are the main tool used to obtain such predictions. One such test, developed at the University of Auckland, utilises the Auckland Pavement Polishing Device (APPD) for accelerated polishing of the samples followed by skid resistance measurement via the Dynamic Friction Tester (DFT). However, the APPD device has never been standardised and little is known about the sensitivity of the device to changes in setup variables such as tyre type, tyre pressure, applied load and chip sizes. Even less is known about the micro-textural wear of aggregates after polishing using the APPD device or the evolution of microtextural wear during the polishing process. Consequently, this research: Evaluates the sensitivity of the APPD polishing mechanism to changes in the aforementioned setup conditions, as measured by corresponding changes in the coefficient of friction. Quantifies the microtextural wear at Equilibrium Skid Resistance (ESR) by undertaking microtextural analysis of height, shape and volume microtexture parameters, using a 3D micro coordinate measurement device. Quantifies the evolution of microtextural wear during the polishing process by undertaking microtextural analysis, using a 3D micro coordinate measurement device. The sensitivity results showed that the coefficient of friction significantly changed when the pressure of the pneumatic tyres changed. It can, therefore, be concluded that the results from the APPD-DFT are sensitive to a ±4 N/cm2 (±5 psi) variation from the typical 14 N/cm2 (20 psi) used in previous research. However, the tyre pressure with 14 N/cm2 (20 psi) …
abstract: Skid resistance is a key factor in road safety. However, over time, the pavement surface is polished by vehicle tyres, reducing the micro-texture of aggregates and macro-texture of the road surface, resulting in a deterioration of skid resistance. Consequently, it is necessary to be able to accurately predict the skid resistance performance of aggregate as part of the design process. Laboratory tests are the main tool used to obtain such predictions. One such test, developed at the University of Auckland, utilises the Auckland Pavement Polishing Device (APPD) for accelerated polishing of the samples followed by skid resistance measurement via the Dynamic Friction Tester (DFT). However, the APPD device has never been standardised and little is known about the sensitivity of the device to changes in setup variables such as tyre type, tyre pressure, applied load and chip sizes. Even less is known about the micro-textural wear of aggregates after polishing using the APPD device or the evolution of microtextural wear during the polishing process. Consequently, this research: Evaluates the sensitivity of the APPD polishing mechanism to changes in the aforementioned setup conditions, as measured by corresponding changes in the coefficient of friction. Quantifies the microtextural wear at Equilibrium Skid Resistance (ESR) by undertaking microtextural analysis of height, shape and volume microtexture parameters, using a 3D micro coordinate measurement device. Quantifies the evolution of microtextural wear during the polishing process by undertaking microtextural analysis, using a 3D micro coordinate measurement device. The sensitivity results showed that the coefficient of friction significantly changed when the pressure of the pneumatic tyres changed. It can, therefore, be concluded that the results from the APPD-DFT are sensitive to a ±4 N/cm2 (±5 psi) variation from the typical 14 N/cm2 (20 psi) used in previous research. However, the tyre pressure with 14 N/cm2 (20 psi) …
author: Tatari, Ashkan
license: https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm
date published: 2020
date modified: 2026-07-24T01:05:11Z
provider: University of Auckland
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: ResearchSpace@Auckland

PropertyValue
property ID: Handle
value: https://hdl.handle.net/2292/55239