SCORING AT HOME : ASPHALT TESTING HEADQUARTERS RELEASES FIRST SET OF TRACK RESULTS

This article presents findings from the first two-year test cycle at the National Center for Asphalt Technology, which created the equivalent of 10-12 years of traffic loading. The tests were carried out on 46 different sections using various aggregates, grades of asphalt and different mixtures. Some were built with marginal aggregates and some with .5% additional asphalt. Mixture types included fine- and coarse-graded Superpave, stone matrix asphalt, open-graded friction courses and variants. No fatigue cracking was expected because of the relatively short test time. The total average rut depth was very small, .12 inches, with the worst no deeper than .25 inches. Fine-graded and coarse-graded mixes performed about the same. The higher PG grades had lower rut depths. Results suggest that more asphalt binder can be added to higher grade PG mixes to make them more durable without affecting rutting. Other findings include the apparent lack of a relation between rutting and dynamic modulus; and a reasonable relation between the confined repeated load test and the Superpave shear test. The next cycle of tests will take place after the track is modified in spring 2003 to research three areas: the 2002 Design Guide, the Simple Performance Test, to see how well it can predict performance, and Perpetual Pavement guidelines.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/11660022
• Corporate Authors:

  Scranton Gillette Communications

  380 E Northwest Highway, Suite 200
  Des Planes, IL  United States  60016-2282
• Authors:
  • Brown, E R
• Publication Date: 2003-1

Language

• English

Media Info

• Features: Figures; Photos;
• Pagination: p. 28-32
• Serial:
  • Roads & Bridges
  • Volume: 41
  • Issue Number: 1
  • Publisher: Scranton Gillette Communications
  • ISSN: 8750-9229
  • Serial URL: http://www.roadsbridges.com/rb/

Subject/Index Terms

• TRT Terms: Asphalt tests; Hot mix asphalt; Pavement performance; Ruts (Pavements)
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00939939
• Record Type: Publication
• Source Agency: UC Berkeley Transportation Library
• Files: BTRIS, TRIS, ATRI
• Created Date: Apr 2 2003 12:00AM