Perform an investigation of the effects of increased reclaimed asphalt pavement (RAP) levels in dense graded friction courses.

Details

• Creators:
  Roque, Reynaldo ; Yan, Yu ; Cocconcelli, Cristian ; Lopp, George
• Corporate Creators:
  University of Florida. Dept. of Civil and Coastal Engineering
• Subject/TRT Terms:
  • Dense graded aggregates
  • Friction course
  • Reclaimed asphalt pavements
  • Mix design
  • Bituminous binders
  • Superpave
  • Pavement cracking
  • Pavement performance
• Publication/ Report Number:
  RFP-DOT-11/12-9033-RC
• Resource Type:
  Tech Report
• Geographical Coverage:
  Florida
• Corporate Publisher:
  Florida. Dept. of Transportation. Research Center
• Abstract:
  In this study, a total of 28 mixture combinations were designed and evaluated to ; determine the maximum allowable amount of reclaimed asphalt pavement (RAP) ; material in friction courses without jeopardizing pavement cracking performance. The ; experimental factors included two RAP sources, four RAP contents, two virgin binders, ; and two mixture conditioning levels. RAP binder was recovered and blended with ; virgin binders at various RAP binder replacement ratios. All blended binders not only ; met the FDOT’s specifications for virgin modified binders, but also had satisfactory ; binder fracture energy density (FED) values. Increased RAP content resulted in ; stronger (higher tensile strength) but more brittle (lower failure strain and lower FED) ; mixtures. However, even after long-term oven aging (LTOA) + cyclic pore pressure ; conditioning (CPPC), all RAP mixtures exhibited FED values above 0.75 kJ/m3 ; and ER ; values well above1.0, indicating adequate cracking performance. Higher RAP content ; generally resulted in higher ER values. Although the increasing trend was reversed ; between 30% and 40% RAP content, the ER at 40% RAP was still well above 1.0 and ; greater than the ER for 20% RAP mixtures. It should be noted that all RAP mixtures ; evaluated not only met Superpave design criteria, but also dominant aggregate size ; range and the interstitial component (DASR-IC) requirements. Satisfactory inclusion of ; up to 40% RAP was for well-designed mixtures with good gradation characteristics and ; with the use of modified asphalt binders
  More +
• Format:
  PDF
• Funding:
  BDU77
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28876/dot_28876_DS1.pdf
• File Type:
  [PDF - 2.19 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:ce32b4d8c8ba23c8b7196113948ff250cf95059225485d0b0b2838ffa1a8d2b0