Alternative Methodology for Determination of Viscosity-Temperature Susceptibility Curves Of Asphalt Binders Used in Hot-Mix Asphalt Design

Viscosity measurements are a fundamental component of asphalt binder characterization procedures. Among other applications, results from viscosity tests are used to generate viscosity-temperature susceptibility (VTS) curves, which are then used to determine Hot Mix Asphalt (HMA) mixing and compaction temperatures, critical to obtain a homogeneous mixture between asphalt and aggregate during mix design procedures. Although different test protocols to measure viscosity of asphalt binders exist, the widespread adoption of the Superpave Performance Grading binder classification system has made the rotational viscometer arguably the most widely implemented piece of equipment for viscosity determination. The current test standard for rotational viscosity determination (AASHTO T-316) demands that different test specimens be used to determine viscosity at each temperature of interest. Since the development of the VTS curve of a given asphalt binder requires the evaluation of its viscosity at different temperatures, different samples are necessary to gather the required information. In order to avoid the inconveniences and loss of time involved in using different samples for each temperature level, a study aimed at developing an alternative methodology to determine VTS curves of asphalt binders using only one test specimen was conducted. The results indicate that mixing and compaction temperatures estimated with the VTS curves developed with the proposed methodology yield the same values than those obtained following the current standard, and given the relatively low accuracy level used when reporting these temperatures, it could be used as an alternative methodology to determine the viscosity-temperature susceptibility characteristics of asphalt binders used for HMA design.

Language

  • English

Media Info

  • Media Type: DVD
  • Features: Figures; References; Tables;
  • Pagination: 13p
  • Monograph Title: TRB 89th Annual Meeting Compendium of Papers DVD

Subject/Index Terms

Filing Info

  • Accession Number: 01155679
  • Record Type: Publication
  • Report/Paper Numbers: 10-2758
  • Files: TRIS, TRB
  • Created Date: Jan 25 2010 11:20AM