Browsing by Author "Millar, Phillip"
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- The Development Of Asphalt Surfacing PropertiesWoodward, David; Millar, Phillip; Friel, Shaun; Mitchell, Richard (2012)This paper considers how the development of asphalt surfacing properties can be predicted in the laboratory. The research has been prompted by the ideals of sustainability coupled with the practical issues being faced by many countries around the world of how to improve, better manage and maintain their highway network. The properties of different types of asphalt surfacing evolve in different ways with time in relation to interactions with factors such as trafficking and climatic conditions. The examples given illustrate a range of methods that help understand these interactions and offer better prediction of likely in-service performance.
- Lateral And Longitudinal Grip VariationWoodward, David; Millar, Phillip (2012)Longitudinal measurement of wet skid resistance is used in many countries to manage the safety of its highway asset. The effect of aggregate type/size, asphalt type / age, degree of trafficking, climate, corners, braking etc. can all be seen in the measured data. However, longitudinal measurement does not show differences in grip across the lane being measured. This paper first considers typical longitudinal variation and then looks at the effect of lateral variation. Simple examples are given for each. The combination of longitudinal and lateral variation is considered in the context of racing circuits. Three case studies explore how GPS based grip data can be plotted using GIS software. The case studies show how the vehicle/tyre interacts with the asphalt surface trying to seek equilibrium conditions.