Comparative Performance of Conventional Cold In-place Recycling to Cold In-place Recycling with Expanded Asphalt: Ontario’s Experience

The Ministry of Transportation Ontario (MTO) constructed its first 5-km trial section of Cold In-Place Recycled Expanded Asphalt Mix (CIREAM) on Highway 7, east of Perth in July 2003, adjacent to 7-km of Cold in-place recycling (CIR) mix. Conventional cold in-place recycling (CIR) is an established pavement rehabilitation method that processes an existing hot mix asphalt (HMA) pavement, sizes it, mixes in additional emulsified asphalt, and lays it back down without off-site hauling and processing. A recent development in CIR technology termed Cold In-Place Recycled Expanded Asphalt Mix (CIREAM) is the use of expanded (foamed) asphalt, rather than emulsified asphalt to bind the mix. Both technologies are considered to be a sustainable pavement rehabilitation that generates less greenhouse gas emission. Both CIR and CIREAM pavement sections were uniform in appearance and performed similarly under traffic. The sections now have 5 years of performance data and the visual distress survey indicated the pavement is performing very well. Automatic Road Analyzer (ARAN) was carried out on an annual basis to evaluate pavement roughness and rutting. Falling Weight Deflectometer (FWD) testing was also carried out annually to compare the strength of CIR and CIREAM. Results of an ANOVA analysis of the ARAN and FWD data show the two sections are performing statistically the same. Summary of the resilient modulus and indirect tensile strength of the two mixes are presented. The five year performance data for CIREAM indicates that the technology is a promising alternative to conventional CIR. MTO will continue to monitor the long-term performance of this innovative rehabilitation technology.


  • English

Media Info

  • Media Type: DVD
  • Features: Figures; References; Tables;
  • Pagination: 13p
  • Monograph Title: TRB 89th Annual Meeting Compendium of Papers DVD

Subject/Index Terms

Filing Info

  • Accession Number: 01150975
  • Record Type: Publication
  • Report/Paper Numbers: 10-1724
  • Files: PRP, TRIS, TRB
  • Created Date: Jan 25 2010 10:46AM