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Best practice for using RAS in HMA.

File Language:
English


Details

  • Alternative Title:
    Project title: Use of recycled asphalt shingles in HMA
  • Creators:
    Zhou, Fujie ORCID ICON IMG ; 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:
  • 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
  • Download URL:
    https://rosap.ntl.bts.gov/view/dot/24258/dot_24258_DS1.pdf
  • File Type:
    Filetype[PDF - 1.31 MB]
  • Collection(s):
    US Transportation Collection
  • Main Document Checksum:
    urn:sha-512:67f08848b37f7e8a66a4c00fb58ca1c5c54c0785b4ddaf6bf28535e62d5f16e5ecedd3f4677bebd6a260b7f4f181c719b92bf571b7ce264165e2288e0cd405f8
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