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:
  Bituminous Binders Dense Graded Aggregates Friction Course Mix Design Pavement Cracking Pavement Performance Reclaimed Asphalt Pavements Superpave
• 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
  
  
• Format:
  PDF
• Funding:
  BDU77
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:ce32b4d8c8ba23c8b7196113948ff250cf95059225485d0b0b2838ffa1a8d2b0
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28876/dot_28876_DS1.pdf
• File Type:
  [PDF - 2.19 MB ]