Field Strain Criteria for Asphalt Mixes at the CPATT Test Road

Two primary causes of increased strain within a pavement structure are environmental and traffic loadings. This paper focuses on repeated traffic loading on asphalt pavement longitudinal strain. Pavements subjected to numerous strain repetitions during their lifetime can have fatigue and rutting failures. The paper describes the Centre for Pavement and Transportation Technology's (CPATT) torture test track field test site and the sensors installed at the base of the asphalt layer and in a reinstated trench. Field instrumentation described in the paper includes nine asphalt strain gauges and one thermocouple placed at the base of a 100mm thick asphalt layer. Experiments were designed to investigate the impact of repeated passes of heavy loaded trucks on the asphalt pavement at a constant base temperature. The design and the results of these two field experiments are described in detail. Key results from the experiment indicate that asphalt strain gauge readings are repeatable and consistent, that there is no residual longitudinal strain in pavement after a loading cycle, that repeated loading cycles did not reduce the pavement strain response, and that the measured tensile longitudinal strain of 130 to 160 microstrain is significantly greater than the 70 microstrain threshold limit suggested in the literature.

• Corporate Authors:

  Polyscience Publications

  P.O. Box 1606, Station St Martin
  Laval, Quebec  Canada  H7V 3P8
• Authors:
  • Vacin, O
  • Knight, M
  • Adedapo, A
  • Bayat, A
  • Tighe, S
• Conference:
  • Fiftieth Annual Conference of the Canadian Technical Asphalt Association (CTAA)
  • Location: Victoria British Columbia, Canada
  • Date: 2005-11-0 to 2005-11-0
• Publication Date: 2005

Language

• English

Media Info

• Media Type: Print
• Pagination: pp 445-458
• Monograph Title: Proceedings of the Fiftieth Annual Conference of the Canadian Technical Asphalt Association (CTAA) in Victoria, British Columbia, November 2005

Subject/Index Terms

• TRT Terms: Bituminous macadam; Conferences; Repeated loads; Sensors; Strain (Mechanics); Strain gages
• Uncontrolled Terms: Longitudinal
• Geographic Terms: Canada
• Subject Areas: Design; Pavements; I22: Design of Pavements, Railways and Guideways;

Filing Info

• Accession Number: 01088992
• Record Type: Publication
• Source Agency: Transportation Association of Canada (TAC)
• Files: TAC
• Created Date: Feb 26 2008 11:08AM