Asphalt Binder Aging and Fracture Evaluation of Hot Mix Asphalt Containing Vacuum Tower Asphalt Extender

Vacuum Tower Asphalt Extender (VTAE) is blended with paving asphalt binder to improve low temperature properties. Some highway agencies have expressed concern regarding the use of VTAE in asphalt related to accelerated aging of the asphalt binder and premature cracking of the asphalt mixture. The objective of this research is to analyze aging of binders formulated with different percentages of VTAE. One source of VTAE was mixed with neat asphalt binder at 0, 3, 6, 9, and 27.5 percent to generate a final PG 58-28 grade. The binders were submitted to the standard long-term aging protocol for 20 hours of Pressure Air Vessel (PAV) conditioning, as well asextended aging of 40 and 60 hours. An HMA mixture was designed using 25 percent asphalt binder replacement from Reclaimed Asphalt Pavement (RAP). Each mixture was tested for cracking potential using the semi-circular bend test as modified by the Illinois Department of Transportation. Mixtures were aged using the standard two-hour oven aging protocol, as well as a long-term protocol for 480 hours. This paper presents results of the aging research and recommends modifications to AASHTO M-320 including specification tests and criteria to ensure proper use of VTAE in the formulation of asphalt binder.

• Corporate Authors:

  Canadian Technical Asphalt Association

  ,   United States 
• Authors:
  • HUBER, GA
  • Kriech, AJ
  • WIELINSKI, JC
  • Horton, A
• Conference:
  • Proceedings of the Sixtieth Annual Conference of the Canadian Technical Asphalt Association (CTAA): Winnipeg, Manitoba
• Publication Date: 2015

Language

• English

Media Info

• Media Type: Print
• Pagination: pp. 395-412.
• Monograph Title: Proceedings of the Sixtieth Annual Conference of the Canadian Technical Asphalt Association (CTAA): Ottawa, Ontario

Subject/Index Terms

• TRT Terms: Admixtures; Aging (Materials); Bituminous materials; Conferences; Cracking; Durability; Evaluation
• Geographic Terms: Canada
• ITRD Terms: 4736: Admixture; 5292: Ageing; 4955: Bituminous materials; 8018: Canada; 8525: Conference; 5211: Cracking; 5910: Durability; 9020: Evaluation (assessment)
• Subject Areas: Data and Information Technology; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01591709
• Record Type: Publication
• Source Agency: Transportation Association of Canada (TAC)
• Files: ITRD, TAC
• Created Date: Feb 26 2016 10:54AM