PAVEMENT TEXTURE AND SKID RESISTANCE MODELS FOR NEW ZEALAND CHIPSEALED PAVEMENTS

Robust models are required by pavement asset managers to predict the change in friction of the network with time in order to optimise maintenance activities. Models are also required by the pavement designer so that friction characteristics of different surface treatments can be compared. A major step in standardising skid resistance measurement was undertaken by the PIARC Technical Committee on Surface Characteristics through the International Experiment to Compare and Harmonise Texture and Skid Resistance Measurement in 1995. The overall objectives of the experiment were to compare the many different measuring methods used around the world and to develop relationships for converting results produced by the different devices to a common scale, the International Friction Index (IFI). As a result, international standardisation and harmonisation is now possible, leading to the development of predictive models. To be useful for pavement management purposes, these models must predict the change of friction with time and the friction requirements for different traffic conditions. Proposed models for use on New Zealand chipseals are discussed in this paper. These models have been derived from previously published information and New Zealand specific research programmes. (a) For the covering entry of this conference, please see IRRD 895316.