Evaluation of the Long-Term Degradation and Strength Characteristics of In-situ Wisconsin Virgin Base Aggregates under Hot Mix Asphalt (HMA) Pavements

The Wisconsin Department of Transportation (WisDOT) is deploying the American Association of State Highway and Transportation Officials (AASHTO)Ware Pavement Mechanistic Empirical (ME) Design software (ME Design) for pavement structural design. As part of this pavement design procedure, assumptions about the long-term strength of the virgin base aggregate will influence the final pavement thickness design. The department performs over 1,500 borings per year as part of the soil/pavement design process. These borings are used to evaluate the existing soil and pavement materials for incorporation into the pavement design process. However, it has often been observed during construction that the virgin base aggregates have degraded since original placement. WisDOT has hypothesized three potential causes: (1) Individual aggregate chemical and physical breakdown/deterioration; (2) Freeze/thaw action; (3.) Infiltration of sub-grade materials. The purpose of this research is to investigate potential degradation of virgin aggregate bases, investigate and document strength reductions over time, and evaluate the likely causes for both. This information will be used for current and future local calibration of the ME Design software.


  • English


  • Status: Active
  • Funding: $119997
  • Contract Numbers:


  • Sponsor Organizations:

    Wisconsin Department of Transportation

    P.O. Box 7915
    4802 Sheboygan Avenue, Room 104
    Madison, WI  United States  53707-7915
  • Project Managers:

    Zimmer, Andrew

  • Performing Organizations:

    University of Wisconsin, Milwaukee

    College of Engineering & Applied Science
    3200 North Cramer Street
    Milwaukee, WI  United States  53217
  • Principal Investigators:

    Titi, Hani

  • Start Date: 20141125
  • Expected Completion Date: 20180531
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01580513
  • Record Type: Research project
  • Source Agency: Wisconsin Department of Transportation
  • Contract Numbers: 0092-15-06
  • Files: RiP, STATEDOT
  • Created Date: Nov 12 2015 5:16PM