Cold Central Plant Recycling

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Mix Design

Mix designs for CCPR are the same as for CIR. As with CIR, mix designs are recommended for all CCPR applications. Adjustments may be required in the field to the recycling agent design content to obtain optimum performance. If materials vary along the project, more than one mix design may be required. See ARRA publications CR201 and CR202 for emulsified asphalt and foamed asphalt CCPR mix design and preconstruction sampling and testing procedures, respectively. AASHTO has developed a provisional mix design procedure for CIR and CCPR using emulsified asphalt, based on ARRA's CR201, AASHTO PP 86-17 and AASHTO MP 31-17. Below are the typical steps for a CCPR mix design:

 

  1. Obtain samples from the existing RAP stockpile or existing pavement
  2. Determine binder content and gradation of extracted aggregate
  3. Determine aged binder properties, if desired
  4. Crush materials to produce RAP and determine gradation
  5. Select type and grade of bituminous recycling agent (emulsion, foamed asphalt)
  6. Select type and amount of recycling additives if required (corrective aggregate, cement)
  7. Prepare and test specimens
  8. Establish job mix formula
  9. Make adjustments in field as necessary