Low Temperature and Moisture Susceptibility of RAP Mixtures with Warm Mix Technology

Details

• Creators:
  Mogawer, Walaa S. ; Austerman, Alexander J.
• Corporate Creators:
  University of Massachusetts Dartmouth. Department of Civil and Environmental Engineering
• Corporate Contributors:
  New England Transportation Consortium ; University of Vermont. Transportation Research Center ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  • Binders
  • Creep
  • Hot mix asphalt
  • Laboratory tests
  • Low temperature
  • Mix design
  • Moisture content
  • Recycled materials
  • Warm mix paving mixtures
• Publication/ Report Number:
  NETCR103
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; New England
• Edition:
  Final report
• Corporate Publisher:
  New England Transportation Consortium
• Abstract:
  A major concern with the use of Warm Mix Asphalt (WMA) technologies has been their impact on the moisture susceptibility of asphalt paving mixtures. This is due to the lower production temperatures associated with mixtures incorporating these technologies which could lead to inadequate drying of aggregates. The moisture susceptibility concern may be compounded if high amounts of Reclaimed Asphalt Pavement (RAP) are added to the mixture. RAP is mixed with the heated aggregates in an attempt to avoid further stiffening of the binder present in the RAP. Therefore, if the aggregates in a mixture are heated at lower temperatures than the conventional temperatures due to WMA, the RAP will be exposed to less heat which might lead to residual moisture in the RAP being present in the mixture. Residual moisture may lead to adhesive and/or cohesive failures. The purpose of this study was to better understand the influence of moisture on the performance of plant produced high RAP content mixtures incorporating WMA technologies fabricated at reduced mixing temperatures.
• Format:
  PDF
• Funding:
  NETCR103
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/64216/dot_64216_DS1.pdf
• File Type:
  [PDF - 1.74 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:0e8ceb2d1f188512cfee14be755d0b1bb505d3bc63944a5e2103648965d3a5b8