Performance-based test regime for high friction surfacing systems on asphalt pavements

Abstract

Specialist surfacings such as high-friction and coloured traffic calming surfaces have gained huge popularity since their introduction. However, the reputation of these specialist systems in New Zealand is also plagued by premature failures due to cracking and other related modes. Many of the failure modes are in fact originated from or at least associated with the performance of the underlying pavement substrate. The purpose of this work is to assess test methods where the emphasis is on the performance of the underlying substrate and its interaction with the specialist surfacing systems to ensure best outcome. A number of resin systems, namely epoxy, polyurethane, and methyl methacrylate were tested using ASTM standard test methods such as a pull-off bond test and % elongation measurements. Thermal effects were also investigated by measuring the coefficient of thermal expansion and conducting thermal cycling experiments. Part of the experimental work is to develop tests which can be implemented in the field. Using these results, it is intended that a practical specification can be developed to include a test or tests to better understand the performance of the surfacing and the underlying pavement and thus ensure future surfacing systems meet their life expectancy.