Wetting characteristics of asphalt binders at mixing temperatures.

Details

• Creators:
  Osmari, Patricia Hennig ; Arega, Zelalem ; Bhasin, Amit
• Corporate Creators:
  University of Texas at Austin. Center for Transportation Research
• Corporate Contributors:
  United States. Department of Transportation. Research and Innovative Technology Administration
• Subject/TRT Terms:
  • Hot mix asphalt
  • Warm mix paving mixtures
  • Binders
  • Wetting
  • Physical properties
  • Temperature
  • Surface tension
  • Viscosity
  • Asphalt mixtures
• Publication/ Report Number:
  SWUTC/13/600451-00062-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Corporate Publisher:
  Southwest Region University Transportation Center (U.S.)
• Description:
  Conventional hot mix asphalt (HMA) is produced by heating the aggregate and the asphalt binder to elevated
  
  temperatures that are typically in the range of 150C to 160C. These temperatures ensure that the viscosity of the
  
  asphalt binder is low enough to effectively coat the aggregate particles. During the past decade, warm mix asphalt
  
  (WMA) has been introduced to reduce the mixing temperatures by approximately 30C compared to HMA. Workability
  
  at these reduced temperatures is typically achieved by the use of chemical additives in the asphalt binder or by foaming
  
  the asphalt binder using small percentages of water. The use of WMA is associated with advantages such as reduced
  
  emissions during mixture production, extended paving season and reduced aging in the asphalt binder. In case of the
  
  WMA and the HMA, one of the important physical properties that dictates the quality of coating is the surface tension
  
  of the asphalt binder at mixing temperatures. In this study, the surface tension of different liquid asphalt binders was
  
  measured at typical mixing temperatures. The effect of binder type, temperature, and chemical additives used to
  
  produce WMA on the surface tension of the binder was evaluated. Three different binders with and without three
  
  different chemical additives were used in this study. The dynamic surface tension was measured using four different
  
  rates of surface formation and at several different temperatures within the range of 140C and 170C. Results show that
  
  the surface tension of asphalt binder depends on the rate of surface formation, temperature and source of the asphalt
  
  binder. Dynamic surface tension of asphalt binders suggests that asphalt binders behave similar to surfactants. The
  
  addition of chemical warm mix additives did not significantly reduce the surface tension of the binder compared to the
  
  control.
• Format:
  PDF
• Funding:
  DTRT12-G-UTC06
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27387/dot_27387_DS1.pdf
• File Type:
  [PDF - 6.32 MB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha-512:0a24000af2011e36d4a8aaf4df8e054515b123e8c38598bc7233ea1f60c44c2a064da84147fcedcf7427844e99bb77911bcf0412025a0019665e2844a7cd545a