Effects of Increased Loading Level and Time on Rutting Resistance of Modified Asphalt Binders and Mixtures

Stress sensitivity, or non-linearity, of modified asphalt binders under increased levels of stress has been the subject of several recent investigations. One of the consequences of these research activities is the introduction of the Multiple-Stress Creep and Recovery (MSCR) for consideration as a new binder specification test. This study is a laboratory investigation for the response of selected asphalt binders and mixtures to increased stresses under repeated loading at pavement temperatures in the range of warm climates. The Dynamic Shear Rheometer (DSR) for binders and the Simple Performance Testing (SPT) device for mixtures were used to compare basic rheological behaviour under repeated loading. The results show that the testing geometry in the DSR has significant effect on the results, particularly at high stress or long time of testing. They also show that asphalt binders' nonlinear behaviour plays a major role in the non-linear stress dependency of mixtures. The stress sensitivity of binders and mixtures are highly dependent on modification type and aggregate gradation. A discussion of the need for considering and modeling of stress dependency of permanent deformation is presented. The results point out the need to simulate actual loading ranges in testing of paving materials and the errors that could result from underestimating loads or using linear visco-elastic properties to characterize asphalt binders and mixtures.

• Corporate Authors:

  Polyscience Publications

  P.O. Box 1606, Station St Martin
  Laval, Quebec  Canada  H7V 3P8
• Authors:
  • MOTAMED, A
  • DELGADILLO, R
  • Bahai, H
  • Zeng, M
• Conference:
  • Proceedings of the Fifty-third Annual Conference of the Canadian Technical Asphalt Association (CTAA)
  • Location: Saskatoon Saskatchewan, Canada
  • Date: 2008-11-0 to 2008-11-0
• Publication Date: 2008

Language

• English

Media Info

• Media Type: Print
• Pagination: p. 211-33
• Monograph Title: Proceedings of the Fifty-Third Annual Conference of the Canadian Technical Asphalt Association (CTAA): Saskatoon, Saskatchewan, November 2008

Subject/Index Terms

• TRT Terms: Bitumen; Conferences; Creep; Equipment; Mix design; Repeated loads; Rutting; Test procedures
• Geographic Terms: Canada
• Subject Areas: Data and Information Technology; I31: Bituminous Binders and Materials; I52: Construction of Pavements and Surfacings;

Filing Info

• Accession Number: 01120608
• Record Type: Publication
• Source Agency: Transportation Association of Canada (TAC)
• Files: TAC
• Created Date: Feb 2 2009 7:40AM