Best practice for using RAS in HMA.

Details

• Alternative Title:
  Project title: Use of recycled asphalt shingles in HMA
• Creators:
  Zhou, Fujie ; Button, Joe W. ; Epps, Jon A.
• Corporate Creators:
  Texas Transportation Institute
• Corporate Contributors:
  Texas. Dept. of Transportation. Research and Technology Implementation Office ; United States. Federal Highway Administration
• Subject/TRT Terms:
  Asphalt Pavements Hot In-place Recycling Hot Mix Asphalt Recycling Pavements, Asphalt--Recycling--Texas
• Publication/ Report Number:
  FHWA/TX-12/0-6614-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Edition:
  Technical report; Sept. 2010-Aug. 2011.
• Corporate Publisher:
  Texas Transportation Institute
• Abstract:
  The use of recycled asphalt shingles (RAS) in hot-mix asphalt (HMA) mixtures has the potential to
  
  significantly reduce the cost of asphalt paving mixes while conserving energy and preserving the
  
  environment. This report documents the best practices for the use of RAS in HMA in terms of RAS
  
  processing, characterizing the processed RAS (binder content, gradations, and performance grade [PG]),
  
  RAS mix design, production, and field construction. First, a six-step RAS processing guideline was
  
  proposed in this study, including collecting, asbestos testing for the tear-off asphalt shingles, sorting,
  
  grinding, screening, and storing the processed RAS. Researchers found that tear-off shingles have higher
  
  binder content than manufacture waste shingles. The manufacture waste shingles have a consistent
  
  20 percent binder content; the tear-off shingles evaluated in this study have various binder contents,
  
  ranging from 23 percent to 28 percent. Furthermore, the overall RAS variability in terms of asphalt binder
  
  content and gradation is low for both manufacture waste and tear-off shingles. Obviously, the RAS
  
  binders are very stiff and their high temperature PG is beyond 140°C, and the low temperature PG is
  
  above 0°C. This study compared the ignition oven method with the extraction method, and found that,
  
  except for one shingle source, both methods produced similar aggregate gradations and asphalt contents.
  
  Issues related to RAS mix design, production, and field construction were identified and discussed in
  
  this report. One important area needing further investigation is the long-term performance of RAS mixes.
  
  Generally, RAS mixes have good rutting resistance, but its resistance to reflective cracking, fatigue
  
  cracking, and potential raveling needs to be evaluated. Life-cycle cost analyses should be performed to
  
  determine the economic viability of using RAS.
  
  
• Format:
  PDF
• Funding:
  Project 0-6614
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:67f08848b37f7e8a66a4c00fb58ca1c5c54c0785b4ddaf6bf28535e62d5f16e5ecedd3f4677bebd6a260b7f4f181c719b92bf571b7ce264165e2288e0cd405f8
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/24258/dot_24258_DS1.pdf
• File Type:
  [PDF - 1.31 MB ]