Oxidative aging of asphalt cements from an Ontario pavement trial

This paper documents and discusses a rheological and spectroscopic investigation of the oxidative aging in asphalt cements from a 2003 northern Ontario pavement trial. Seven asphalt cements were aged according to standard methodology (rolling thin film oven test (RTFOT) and pressure aging vessel test (PAV)), as thin films at temperatures of 45, 65, and 85 °C and standard pressure (thin film oven test (TFOT)), and under modified PAV conditions (extended time of 40 hours). It was found that the current RTFOT/PAV protocol provided insufficient aging for the poor performing asphalt cements. Infrared analysis of the TFOT-aged samples for the formation of carbonyl groups could largely explain the performance ranking in service. The only significant outlier was modified with polymer and waste engine oil residue. Rheological investigations of the recovered and the TFOT-aged residues were able to show that such materials likely suffer from early gel formation. These findings illustrate the need for improved asphalt cement aging protocols. A preliminary example is provided that shows how simply doubling the PAV aging time to 40 hours can produce materials that more closely replicate those aged for 5-6 years in a northern Ontario climate. It was further confirmed that both chemical and physical hardening tendencies are closely correlated, likely because they involve similar asphalt constituents.

• Record URL:
  • http://www.ijprt.org.tw/files/sample/V4N5%28259-267%29.pdf
• 
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/19966814
• Supplemental Notes:
  • Abstract used by permission of publisher.
• Authors:
  • Wright, Logan
  • Kanabar, Amit
  • Moult, Eric
  • Rubab, Syed
  • Hesp, Simon A M
• Publication Date: 2011-9

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 259-267
• Serial:
  • International Journal of Pavement Research and Technology
  • Volume: 4
  • Issue Number: 5
  • Publisher: Chinese Society of Pavement Engineering
  • ISSN: 1996-6814
  • EISSN: 1997-1400
  • Serial URL: http://www.ijprt.org.tw/index.php
• Publication flags:

  Open Access (libre)

Subject/Index Terms

• TRT Terms: Asphalt cement; Asphalt hardening; Asphalt pavements; Laboratory tests; Low temperature; Material aging; Oven tests; Oxidation; Pavement cracking; Pavement performance; Performance based specifications; Rheological properties; Spectroscopic analysis; Testing
• Geographic Terms: Ontario (Province)
• Subject Areas: Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01355981
• Record Type: Publication
• Files: TRIS
• Created Date: Oct 31 2011 9:52AM