PROGRESS IN HOT-IN-PLACE RECYCLING TECHNOLOGY

The concept of recycling asphalt pavements has been attempted using a range of methods for more than eighty years. Starting with simple concepts of crushing old pavements for use in highway fill, the technology has progressed through numerous phases. The most recent began in the mid 1970s when both central plant and in-place methods were initiated. Hot central plant recycling and cold in-place recycling (CIR) have gained general acceptance by many agencies. Hot in-place recycling (HIR) has been used for nearly 50 years but public agencies have been slow to implement the technology. However, recently developed equipment and procedures have made HIR a very viable alternative for pavement rehabilitation. HIR methods began with various equipment that used flames which impinged directly on the pavement surface then progressed through several evolutions of heating methods including infrared. The current state-of-the-art is a hot-air system that overcomes the previous limitations of shallow depth of heating, burning of the surface, and creation of objectionable smoke. This paper includes a technical description of HIR equipment and methods and test results from early projects using the more modern, efficient equipment. The data and early performance evaluation show that the 100% recycled asphalt concrete was aged insignificantly and had laboratory test properties equivalent to virgin hot mix.

• Supplemental Notes:
  • This conference was arranged by the International Society for Asphalt Pavements. The ninth conference will be held in Copenhagen, Denmark in August 2002.
• Corporate Authors:

  University of Washington, Seattle

  Department of Civil and Environmental Engineering, P.O. Box 352700
  Seattle, WA  United States  98195-2700
• Authors:
  • Terrel, R L
  • Joharifard, M
  • Epps, J A
  • Wiley, P C
• Conference:
  • Eighth International Conference on Asphalt Pavements
  • Location: Seattle, Washington
  • Date: 1997-8-10 to 1997-8-14
• Publication Date: 1997

Language

• English

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 609-627

Subject/Index Terms

• TRT Terms: Asphalt pavements; Equipment; Hot in-place recycling; Hot mix asphalt; Laboratory tests; Performance evaluations; Recycling; State of the art studies
• Subject Areas: Construction; Highways; I52: Construction of Pavements and Surfacings;

Filing Info

• Accession Number: 00764682
• Record Type: Publication
• Report/Paper Numbers: Volume I
• Files: TRIS, ATRI
• Created Date: Jun 10 1999 12:00AM