This paper was presented at the session titled `Innovative pavement design and evaluation techniques'. Ultra-Thin Whitetopping (UTW) is a relatively new pavement rehabilitation strategy addressing the rutting and washboarding problems of existing asphalt pavements, in particular at intersections. The first Canadian UTW project was constructed in August of 1995, in Mississauga at the intersection of Britannia and Dixie Roads. This intersection is located in an industrial area on the west side of the Lester B. Pearson International Airport. One leg of this intersection had severely rutted after 8 years of heavy truck traffic. Approximately 100mm of asphalt was removed and replaced with the same thickness of concrete. The intersection is in good condition today without any major distress and little or no maintenance. Since then, four more UTW projects have been constructed in the City of Brampton along a busy thoroughfare, Queen Street East, to address the rutting problem caused by both heavy commercial and transit traffic. These pavements continue to perform today requiring no maintenance. The UTW also restores the required skid resistance to the roadways for safety. This paper deals with the design criteria, construction issues, subsequent monitoring and maintenance experiences. In addition, the ebonding of concrete and asphalt will be discussed based on testing data. (A)
Abstract