Synthesis of Information Related to Highway Practices. Topic 51-08. Practice and Performance of Cold In-Place Recycling and Cold Central Plant Recycling

Cold recycling consists of recycling reclaimed asphalt pavement (RAP) without the use of heat. The two categories of cold recycling that are becoming more prevalent in the road building industry include: Cold In-place Recycling (CIR) and Cold Central Plant Recycling (CCPR). A typical layer thickness is three to five inches. CIR occurs in situ where a portion of the upper layers of existing asphalt pavement is milled, crushed, blended with recycling agents and repaved while leaving the lower existing pavement in place. The CIR process occurs in the roadway without the RAP material leaving the road. The CCPR process produces a product that is similar to CIR but the recycling occurs at a mobile plant. The RAP used for CCPR may either come directly from a paving project by milling or be found in existing RAP stockpiles. Typical recycling agents used for CIR and CCPR are emulsified asphalt or foamed asphalt. The objective of this synthesis is to document how CIR and CCPR technologies are selected, designed, constructed, and evaluated by state DOTs.


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  • Status: Active
  • Funding: $45000
  • Contract Numbers:

    Project 20-05, Topic 51-08

  • Sponsor Organizations:

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001

    American Association of State Highway and Transportation Officials (AASHTO)

    444 North Capitol Street, NW
    Washington, DC  United States  20001

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Project Managers:

    Zwahlen, Tanya

  • Performing Organizations:

    Gardiner Technical Service LLC

    City,   United States 
  • Principal Investigators:

    Stroup-Gardiner, Mary

  • Start Date: 20190916
  • Expected Completion Date: 0
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01704611
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 20-05, Topic 51-08
  • Files: TRB, RIP
  • Created Date: May 13 2019 3:09PM