Effect of RAP and RAS Mixture on Flexible Pavement Design

Recycled asphalt pavement (RAP) and recycled asphalt shingles (RAS) are now being widely used in the construction of new and rehabilitated pavements. The mechanical and rheological properties of hot-mix asphalt (HMA) containing RAP and RAS have been the topic of extensive research lately. In this study, flexible pavement sections incorporating virgin HMA mix and six other HMA mixes with varying percentages of RAP and RAS have been designed using the AASHTOWare Pavement ME Design software. Three different pavement structure types and both level 3 traffic inputs (Pavement ME default) and level 2 traffic inputs developed for Kansas rural arterials were used in the design analysis. The required pavement thickness for the virgin mix was found to be less than that required for HMA mixes with RAP and RAS. Pavement ME design software predicted significant top-down fatigue cracking for some mixtures with RAP and RAS. The predicted rut depths for mixes with RAP and RAS seemed to vary with RAS source and RAP and RAS content. The designs were also very sensitive to subgrade soil type but not so to the aggregate base (if used) thickness.

• Supplemental Notes:
  • This paper was sponsored by TRB committee AFD60 Standing Committee on Flexible Pavement Design.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Islam, Shuvo
  • Sufian, Abu
  • Tavakol, Masoumeh
  • Hossain, Mustaque
• Conference:
  • Transportation Research Board 95th Annual Meeting
  • Location: Washington DC, United States
  • Date: 2016-1-10 to 2016-1-14
• Date: 2016

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: 17p
• Monograph Title: TRB 95th Annual Meeting Compendium of Papers

Subject/Index Terms

• TRT Terms: Fatigue cracking; Flexible pavements; Hot mix asphalt; Mechanistic-empirical pavement design; Reclaimed asphalt pavements; Rutting; Shingles
• Identifier Terms: AASHTOWare (Software)
• Geographic Terms: Kansas
• Subject Areas: Design; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01592508
• Record Type: Publication
• Report/Paper Numbers: 16-5775
• Files: TRIS, TRB, ATRI
• Created Date: Feb 29 2016 5:49PM