A procedure is needed for predicting the durability requirements of asphalts. Development of this procedure should result in specifications for improvement of asphalt quality. First, testing techniques must be identified that will be sensitive to changes in asphalt quality. Second, these changes must be related to in-service changes in pavements. Third, the quality specifications must be imposed to curb the inevitable time-dependent changes to the degree desired. This study identified testing techniques that are sensitive to changes in asphalt quality by comparing the results of tests of (a) chemical composition, (b) vanadium content, (c) weatherometer exposure, and (d) rolling thin film oven aging to the durability of environmentally aged specimens. Durability is considered to be measured by the combination of viscosity and asphaltene increases with time. Rankings of each of these testing techniques are compared to actual environmental rankings to illustrate the techniques that best identify the durability changes. The major finding of the study is the high degree of correlation between the vanadium content and environmental rankings. If compositional considerations are such that any asphalt imbalance or high volatility is a minimal factor, then the vanadium content is the best single parameter for predicting asphalt durability.

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References; Tables;
  • Pagination: pp 1-8
  • Monograph Title: Asphalts, aggregates, mixes and stress-absorbing membranes
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00148651
  • Record Type: Publication
  • ISBN: 0309025648
  • Files: TRIS, TRB
  • Created Date: Mar 30 1977 12:00AM