Ontario's Experience with Rubber Modified Hot Mix Asphalt

Between 1980 and 1995, the Ontario Ministry of the Environment (MOE) in cooperation with the Ontario Ministry of Transportation (MTO) constructed over thirty test sections incorporating Crumb Rubber Modifier (CRM) to evaluate the performance of rubber modified Hot Mix Asphalt (HMA). In 1997 and 2003, studies were undertaken to evaluate these test sections. Both studies overwhelmingly indicated that the dry process was not appropriate for roadways with Annual Average Daily Traffic (AADT) of 1000 or higher. The semi-wet process produced pavements that performed comparably to conventional HMA, while the wet process produced pavements similar to or better than conventional HMA. So far, experience in Ontario has not proven rubber modified HMA to be a cost effective technology. However, in view of the environmental benefits it is important to continue to study HMA incorporating CRM. In 2008, MTO built two trial sections on Highway 15 in Smiths Falls using the semi-wet process to further assess rubber modified HMA. Initial findings support building additional trial sections in future using wet or semi-wet processes as MTO works toward effectively adopting this technology. This paper overviews Ontario's three decades of experience with rubber modified HMA and provides recommendations for future considerations of using CRM in HMA. (A)

Language

  • English

Media Info

  • Pagination: p. 173-190

Subject/Index Terms

Filing Info

  • Accession Number: 01149463
  • Record Type: Publication
  • Source Agency: Transportation Association of Canada (TAC)
  • Files: TAC
  • Created Date: Jan 28 2010 7:32AM