Overview

With innovative and high-performance asphalt mixes such as EME2 and warm-mix asphalt being applied on WA roads, the possibility that these new technologies may not sufficiently bond with adjacent layers is a concern. For a pavement to perform optimally, adjacent pavement layers need to be fully bonded together, otherwise the full structural capacity will not be realised. WARRIP is developing a standard test method that will assess the bond strength between two asphalt layers (new and existing) using the Leutner shear test apparatus. This new test method will be used to investigate the effects of temperature, surface texture and tack coats on bond strength. Developing a standard Main Roads test method is the first step to establishing bond strength limits for pavements in WA and nationally.