SURVEY ON CURRENT PRACTICES FOR EVALUATING WARM MIX ASPHALT MOISTURE SUSCEPTIBILITY

Warm Mix Asphalt (WMA) technology is becoming more commonly used by transportation agencies. This is due to the pressures from environmental acts and agencies to reduce Green House Gas (GHG) emissions generated by production and placement of paving mixtures. However, WMA technology has certain functional considerations, namely moisture susceptibility that need to be addressed in order to achieve performance equivalent to conventional Hot-Mix Asphalt (HMA) with the additional benefits of reduce emissions. To identify possible gaps in the WMA that need to be closed with further research, a Canada-wide survey has been prepared at the Centre for Pavement and Transportation Technology (CPATT) located at the University of Waterloo to document the state-of-the-art related to WMA technologies. This paper presents the results of this survey on the preferred practices conducted by various Canadian transportation agencies.