FINDING IDEAL HOT MIX IN THE DESERT

The innovative WesTrack facility in Reno, Nevada--the first test track to use driverless trucks--is wrapping up 2.5 years of pavement testing. Guided by wires buried in the hot-mix asphalt (HMA) pavement, four driverless trucks traveled an average of 15 hours a day around the 1.8-mi (2.9-km) oval track, applying the equivalent of more than 5 million single-axle loads. Over the course of their runs, the heavily laden trucks simulated more than 10 years of interstate-level traffic loads. The experiment was designed to evaluate how variations in HMA construction quality, such as asphalt content, aggregate gradation, and compaction, affect pavement performance. The track also was designed to test the Superpave mix design and analysis procedures. Several of the track's test sections developed rutting in 1997 after carrying traffic for just a few days. A team of independent experts determined that the pavement failure was caused by high voids in the mineral aggregate (VMA) in the mix and recommended capping the amount of VMA in mix designs.

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  • Corporate Authors:

    Scranton Gillette Communications

    380 E Northwest Highway, Suite 200
    Des Planes, IL  United States  60016-2282
  • Authors:
    • Williams, C
  • Publication Date: 1999-8

Language

  • English

Media Info

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Filing Info

  • Accession Number: 00781673
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 11 2000 12:00AM