Development of Mix Design Criteria for Low Traffic Volume Hot Mix Asphalt Roads

Research was carried out to develop volumetric criteria for design of Hot Mix Asphalt (HMA) mixes for low volume roads. Two dense graded, 9.5 mm nominal maximum aggregate size, mixes were produced with different asphalt contents and compacted to produce samples at construction voids of approximately 7 percent. These samples were tested and the results were analyzed to determine optimum asphalt content for these mixes. Ten cores were obtained from the outside wheel path of a good performing 12 year old low volume traffic road in Connecticut. Aggregates were extracted from these cores, mixed with fresh asphalt of the same grade, and in the same percentage as used in the mix originally, and then compacted. The compacted samples were tested for bulk specific gravity and air voids versus gyration data was obtained. Results show that, with percent passing 2.36 mm sieve ranging from 40 to 47 percent, the optimum asphalt contents and VMA are 6 and 16 percent, respectively. Results from testing of in-place mix indicated design gyration of 65 for obtaining a void content of 4 percent and VMA of 16 percent. A design gyration of 70 is recommended at this time for mixes with gradations close to the maximum density line.

Language

  • English

Media Info

  • Media Type: Print
  • Pagination: pp. 241-251.
  • Monograph Title: Proceedings of the Forty-Eighth Annual Conference of the Canadian Technical Asphalt Association (CTAA): Halifax, Nova Scotia, November 2003

Subject/Index Terms

Filing Info

  • Accession Number: 01604988
  • Record Type: Publication
  • Source Agency: Transportation Association of Canada (TAC)
  • Files: ITRD, TAC
  • Created Date: Jul 26 2016 5:02PM