More Practical Wheel Tracking Test for Rutting Resistance of Asphalt Mixtures

Wheel tracking tests have seen a vast increase in usage among various state department of transportations for measuring rutting resistance of mixtures that already meet volumetric property requirements. With the increase in using recycled materials and warm mix additives, it is clear that using volumetric properties alone to approve asphalt mixture designs is a risky approach. Wheel tracking tests are among the most widely used methods for evaluating rutting resistance, and the AASHTO T324 (Hamburg Wheel-Tracking [HWT]) is the most widely accepted and followed procedure used today in the U.S. However, there are challenges using the HWT, among which the most difficult are the poor repeatability, time required to complete the test, and the sample preparation details. This study reports on an alternative wheel tracking method called the Rotary Asphalt Wheel Tester (RWT) that can successfully address the challenges currently faced with using the HWT. The method requires no cutting of the gyratory samples, significantly reduces time to complete a sample, and appears to offer acceptable repeatability of the results. The method has existed for more than 15?years, available commercially, but used only in a few labs, and one acceptance criterion is already developed by one agency. The study includes evaluating an expanded set of mixtures tested at two temperatures, and two air voids. The results of the RWT are compared with the results of the HWT for numerous mixtures and they show that similar qualitative ranking can be achieved.

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  • Supplemental Notes:
    • The Standing Committee on Surface Requirements of Asphalt Mixtures (AFK40) peer-reviewed this paper (19-01470). © 2019 National Academy of Sciences: Transportation Research Board.
  • Authors:
    • Lemke, Zachary
    • Bahia, Hussain U
  • Publication Date: 2019-12

Language

  • English

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  • Accession Number: 01713822
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: Aug 2 2019 3:06PM