EFFECTS ON FLEXIBLE HIGHWAYS OF INCREASED LEGAL VEHICLE WEIGHTS USING VESYS IIM

This report provides results of a detailed study to estimate lifetime costs for flexible pavements as a function of legal axle limits using an improved version of FHWA Computer Program VESYS IIM. VESYS IIM was modified to include capabilities for: (1) seasonal characterizations of pavement materials, (2) a discretized representation of axle load distribution, and (3) low-temperature cracking predictions. A combined survey of the literature and laboratory testing program was conducted to define the variations in material permanent deformation parametes as important material characteristics vary seasonally with the environment. The resulting data and other information and experience were applied to arrive at input data that would yield realistic performance predictions. A factorial of 64 solutions was obtained using the improved version of VESYS IIM and the input data developed to study the effects of truck traffic consistent with four levels of legal axle limits (18, 20, 22 and 24 kips), two levels of traffic, two levels of pavement section thickness and four environmental zones (Wet-Freeze, Dry-Freeze, Wet-No Freeze and Dry-No Freeze). Where failures were predicted, and ovelay was applied and a new solution obtained until a pavement life of at least 20 years was attained. The initial and overlay costs were estimated and these costs for 20 years of pavement service were related to the legal axle limits. /FHWA/

  • Supplemental Notes:
    • Sponsored by the Department of Transportation, Federal Highway Administration.
  • Corporate Authors:

    Austin Research Engineers Incorporated

    2600 Dellana Lane
    Austin, TX  USA  78746
  • Authors:
    • Rauhut, J B
  • Publication Date: 1978-1

Media Info

  • Pagination: 215 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00185261
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-RD-77-116 Final Rpt., FCP 35D3-122
  • Contract Numbers: DOT-FH-11-9104
  • Files: TRIS, USDOT
  • Created Date: Feb 27 1979 12:00AM