MECHANISTIC DESIGN CONCEPTS FOR FULL-DEPTH ASPHALT CONCRETE PAVEMENTS

A mechanistic design procedure for Full-Depth asphalt concrete AC pavements for highways is proposed and validated. The procedure is based on ILLI-PAVE, a stress dependent finite element computer program, coupled with appropriate transfer functions. Two material design criteria are considered: AC flexural fatigue cracking and subgrade rutting. Fatigue cracking is controlled by limiting the tensile strain at the bottom of the AC-subgrade interface. Algorithms were developed relating pavement response parameters (stresses, strain, deflections) to AC thickness, AC moduli, and subgrade moduli. Two fatigue equations were calibrated with ILLI-PAVE algorithms and data from the AASHO Road Test bituminous wedge sections. Weighting factors are developed and validated. Relationships between weighing factors and mean monthly air temperatures are established. From the WF-MMAT relationship a "design season condition" is determined. The design season condition is represented by the effective AC dynamic modulus and the subgrade resilient modulus corresponding to late spring or early summer. The proposed mechanistic design procedure requires AC thicknesses less than those required by IDOT, The Asphalt Institute, and the Shell procedures. The thickness discrepancies vary depending on traffic and subgrade support. (Author)

  • Record URL:
  • Corporate Authors:

    University of Illinois, Urbana-Champaign

    Department of Civil and Environmental Engineering
    205 North Mathews Avenue
    Urbana, IL  United States  61801-2352

    Illinois Department of Transportation

    Bureau of Materials and Physical Research
    126 East Ash Street
    Springfield, IL  United States  62704-4766

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Gomez, M
    • Thompson, M R
  • Publication Date: 1984-8

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 229 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00395179
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-IL-UI-207, UILU-ENG-84-2006
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Nov 30 1985 12:00AM