Improving the properties of reclaimed asphalt pavement for roadway base applications.

Details

• Creators:
  Cosentino, Paul J. ; Kalajian, Edward H. ; Bleakley, Albert M. ; Diouf, Babacar S. ; Krajcik, Ryan E. ; Misilo, Thaddeus J. ; Petersen, Andrew J. ; Sajjadi, Amir M.
• Corporate Creators:
  Florida Institute of Technology. Civil Engineering Dept.
• Corporate Contributors:
  Florida. Department of Transportation
• Subject/TRT Terms:
  • Paving
  • Asphalt pavements
  • Pavement performance
  • Portland cement concrete
  • Portland cement
  • Waste products (Materials)
  • Recycled materials
  • Waste products as road materials
  • Pavements--Design and construction
  • Pavements, Asphalt--Design and construction
  More +
• Publication/ Report Number:
  FL/DOT/BDK81 97702
• Resource Type:
  Tech Report
• Geographical Coverage:
  Florida
• Edition:
  Final report; Oct. 2009-Aug. 2012.
• Corporate Publisher:
  Florida Institute of Technology. Civil Engineering Dept.
• Abstract:
  The objective of this study was to improve Reclaimed Asphalt Pavement’s (RAP) strength in base course ; applications while reducing creep to an acceptable level using compaction techniques, fractionating, ; blending with high quality base course aggregate, and/or by chemical stabilization with asphalt emulsion, ; Portland cement, or lime. RAP/limerock blends with and without chemical stabilization were compacted by ; modified Proctor, Marshall, or gyratory methods, cured, and tested for strength and creep. Strength tests ; included limerock bearing ratio (LBR), unconfined compression, Marshall compression, and indirect tensile ; tests. Strength specimens were tested dry and soaked to evaluate retained strength. Seven-day onedimensional ; creep testing was performed. Gyratory compaction produced higher densities than modified ; Proctor or Marshall compaction. At the same density, gyratory compaction improved RAP’s strength by a ; factor of two to three over modified Proctor but had less effect on creep. Modified Proctor moisture-density ; plots followed an S-shape without a clear optimum; modified Proctor may not be the best method to predict ; RAP compaction behavior. Fractionating RAP did not improve strength or creep unless RAP was remixed to ; match a maximum density curve. Fractionating did not produce acceptable LBRs or creep. RAP blended ; with limerock, cemented coquina, or reclaimed concrete aggregates showed improved LBR and creep ; performance. RAP/aggregate blends have the potential to be used as Florida base course. As the amount of ; aggregate blended with RAP increased, LBR increased and creep decreased. Creep behavior of blends with ; 75% aggregate was similar to 100% aggregate. Unstabilized blends with 50% aggregate did not produce ; LBR values over 100. Blends of 50% RAP/50% limerock stabilized with 1% of either asphalt emulsion or ; cement attained soaked LBRs over 100 and acceptable creep. Blends of RAP with 75% limerock attained ; soaked LBRs close to 100 and low creep without any chemical stabilizer. Adding RAP to limerock blends ; generally increased the soaked retained strength and improved permeability compared to 100% limerock.
  More +
• Format:
  PDF
• Funding:
  Contract Number BDK81 977-02
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/24481/dot_24481_DS1.pdf
• File Type:
  [PDF - 16.50 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:fcdb5879365fcfa11fca9f029bc996698f224722ebd4a7d59240d7380802d53c