MECHANISTIC EVALUATION AND CALIBRATION OF THE AASHTO DESIGN EQUATIONS AND MECHANISTIC ANALYSIS OF THE SHRP ASPHALT SURFACED PAVEMENT SECTIONS

Mechanistic evaluation of the American Association of State Highway and Transportation Officials (AASHTO) flexible design equations was conducted by using 243 artificial pavement sections with various layer properties, roadbed soil modulus, and traffic volumes. Throughout the analyses it is assumed that the mechanistic responses (stresses, strains, and deflections) of the pavement sections due to an applied 9,000 pound of load are indicative of the level of damage delivered to these sections. Results of the analyses indicated that while the AASHTO design method produces pavement sections with an almost equal level of protection, the damage delivered to the various layers vary from one section to another. Further, the AASHTO method does not consistently account for the effects of the drainage quality on the layer thickness and/or on the pavement responses. A mechanistic-based modification procedure of the effects of the AASHTO drainage coefficient is presented. It is shown that the mechanistic-based method produces more consistent pavement sections and that the variations of their mechanistic responses are much less than those produced by the AASHTO method. A nomograph for estimating the effects of drainage coefficients on the expected life of the pavement structures is also presented and discussed. Finally, the results of the backcalculated layer moduli of some of the Strategic Highway Research Program asphalt surfaced General Pavement Studies sections are presented and the accuracy of the values briefly discussed.

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  • Corporate Authors:

    Strategic Highway Research Program

    National Research Council, 2101 Constitution Avenue, NW
    Washington, DC  United States  20418
  • Authors:
    • Baladi, G Y
    • McKelvey, F X
  • Publication Date: 1994-2

Language

  • English

Media Info

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

Subject/Index Terms

Filing Info

  • Accession Number: 00663096
  • Record Type: Publication
  • Report/Paper Numbers: SHRP-P-678
  • Files: TRIS, TRB
  • Created Date: Jul 13 1994 12:00AM