Mixing and compaction recommendations for warm mix asphalt (WMA) with recycled asphalt shingles (RAS) : final report.

Details

• Creators:
  Bennert, Thomas ; Ericson, Christopher ; Wass Jr, Ed
• Corporate Creators:
  Rutgers University. Department of Civil & Environmental Engineering ; Rutgers University. Center for Advanced Infrastructure and Transportation
• Corporate Contributors:
  United States. Department of Transportation. Research and Innovative Technology Administration ; United States. Department of Transportation. University Transportation Centers (UTC) Program
• Subject/TRT Terms:
  • Asphalt mixtures
  • Bituminous binders
  • Compaction
  • Laboratory tests
  • Mixing
  • Recycled materials
  • Shingles
  • Warm mix paving mixtures
  • Recycled asphalt shingles
  • warm mix asphalt
  More +
• Publication/ Report Number:
  CAIT-UTC-028
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Final report
• Corporate Publisher:
  Rutgers University. Center for Advanced Infrastructure and Transportation
• Abstract:
  The use of recycled asphalt shingles (RAS) is an attractive option for asphalt mixture producers due to the ; high amount of recycled asphalt binder available in RAS. By weight, RAS contains 10 to 25% asphalt by total ; weight of the shingle. The asphalt binder in RAS is generally much stiffer than conventional paving asphalts due ; to the requirements of the roofing shingle industry. This increase in asphalt binder stiffness generally results in a ; stiffer asphalt mixture that is more difficult to compact in the field. Some asphalt mixture suppliers are looking at ; utilizing warm mix asphalt (WMA) technologies to help with compaction, but still limited information exists on ; the use of WMA with RAS and how the mixing and compaction properties are influenced. ; With the transportation infrastructure industry moving towards sustainable technologies and recycling when ; possible, the use of recycled asphalt shingles (RAS) in hot mix asphalt looks appealing. However, the handling ; and performance of these mixtures is still highly questioned and viewed as potentially problematic by most ; agencies. ; A laboratory study was conducted to evaluate the impact on recycled asphalt shingles (RAS) on the ; compactability of asphalt mixtures. Two different methodologies were utilized in the study: 1) Asphalt binder ; based testing; and 2) Asphalt mixture based testing. In addition to the RAS, two different types of WMA ; technologies were included to evaluate the change in asphalt compactibility. The results of the study showed that ; performance grading of the RAS required the RAS to be blended with a much softer asphalt binder at varying ; percentages; the inclusion of recycled asphalt shingles, whether it is Post Manufacturer or Post Consumer, will ; detrimentally impact the mixing and compaction properties of the asphalt mixtures; and that the addition of ; WMA technologies to the RAS asphalt mixtures does appear to aid in the compaction properties of the final ; asphalt mixture.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/32401/dot_32401_DS1.pdf
• File Type:
  [PDF - 546.58 KB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha256:eff347d19f16094c9172b83e634fd3914f3f197fdb5d4115ce2ed734d1c1ec1b