Use of Asphalt Pavement Analyzer Testing forEvaluating Premium Surfacing Asphalt Mixturesfor Urban Roadways

摘要

Urban roadway pavement rutting, particularly at signalized intersections, is arnsignificant issue and a challenge for those responsible for municipal pavementrninfrastructure. Agencies have, in recent years, been proactive in trying newrnstrategies for dealing with this problem. These strategies have included premiumrnhot mix asphalt (HMA) surfacing materials including the use of polymer modifiedrnor performance grade asphalt binder, stone matrix asphalt (SMA), Superpavernmix types, sulfur extended asphalt modifier, and asphalt rubber mixes. ThernCities of Calgary and Lethbridge have recently installed various types ofrnpavement surfacing materials with the objective of assessing performance underrnin-service conditions. The limited experience with these types of hot mix asphaltrnmaterials has made it necessary for the municipal agencies to adopt availablernmethods to provide some indication of their performance prior to their widespreadrnuse in construction. The Asphalt Pavement Analyzer (APA) has been shown tornbe a useful tool for the assessment of the permanent deformation (rutting)rnresistance of HMA materials.rnThis paper describes how APA testing was used for the assessment of HMArnmaterials within the context of projects undertaken by the Cities of Lethbridgernand Calgary, in 2003 and 2004. In some cases the APA testing was used tornvalidate and/or optimize HMA mixture designs. This means of acceleratedrntesting was also used to evaluate the rut resistance performance of constructedrnpavements, with the objective of assessing the different materials andrnconstruction strategies. Guidance regarding the use of APA results, includingrnbenefits as well as limitations, is provided.