RAP or RAS? The Differences in Performance of HMA Containing Reclaimed Asphalt Pavement and Reclaimed Asphalt Shingles

This study compares the laboratory performance of four Hot Mix Asphalt (HMA) mixes: one that contains only Reclaimed Asphalt Pavement (RAP), and three mixes that contain different Reclaimed Asphalt Shingles (RAS) products. The use of RAP in HMA has become a widely accepted practice by most of the paving industry. As the cost of virgin materials continues to rise, the use of cost efficient and quality recycled materials is also increasing, and RAS have begun to be considered a viable source of recycled binder and aggregate. Superpave mixture designs resulted in higher asphalt contents and VMA values for the RAS mixtures as compared to the RAP mixture. Testing included the determination of PG grade, shear modulus and phase angle, creep stiffness and slope values, and critical cracking temperatures for binder recovered from the HMA mixtures. Mixture testing included complex modulus and Thermal Stress Restrained Specimen Tensile Strength tests on all four mixtures and fatigue testing on two mixtures. The Hirsch model was used to backcalculate the binder shear modulus; values for binder modulus and phase angle were used to determine the effective high temperature PG grade of the mixtures. The binder testing indicates that the RAS mixtures are stiffer than the RAP mix at high temperatures and would perform better with respect to low temperature cracking. The mixture testing shows that all four mixtures have similar low temperature performance, but the RAP mix is stiffer and has a poorer fatigue resistance at intermediate temperatures than the RAS mixtures.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/02702932
• Authors:
  • Foxlow, Jennifer J
  • Daniel, Jo Sias
  • Swamy, Aravind Krishna
• Discussers:
  • D'Angelo, John
  • Daniel, Jo
  • Reinke, Gerald
  • Marks, Pamela
  • Glover, Iona
  • Page, Gale
• Conference:
  • Asphalt Paving Technology 2011
  • Location: Tampa FL
  • Date: 2011-3-27 to 2011-3-30
• Publication Date: 2011

Language

• English

Media Info

• Media Type: Print
• Features: CD-ROM; Figures; References; Tables;
• Pagination: pp 347-376
• Serial:
  • Journal of the Association of Asphalt Paving Technologists
  • Volume: 80
  • Publisher: Association of Asphalt Paving Technologists (AAPT)
  • ISSN: 0270-2932
  • Serial URL: https://www.asphalttechnology.org/site_page.cfm?pk_association_webpage_menu=9169&pk_association_webpage=19109

Subject/Index Terms

• TRT Terms: Asphalt pavements; Bituminous binders; Hot mix asphalt; Low temperature; Pavement performance; Shingles; Waste products (Materials)
• Subject Areas: Design; Highways; Materials; Pavements; I31: Bituminous Binders and Materials; I33: Other Materials used in Pavement Layers;

Filing Info

• Accession Number: 01367545
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 10 2012 3:17PM