A VALIDATED MODEL FOR PREDICTING FIELD PERFORMANCE OF AGGREGATE BASE COURSES

The ICAR Research Project 502 has focused on determining structural considerations of unbound aggregate pavement layers for a proper representation in the new AASHTO Pavement Design Guide - 2002. The research team developed models for the resilient and permanent deformation behavior from the results of triaxial tests conducted at the Texas Transportation Institute (TTI) and at the University of Illinois. The studies have mainly indicated that the unbound aggregate base (UAB) material should be modeled as nonlinear and cross-anisotropic to account for stress sensitivity and the significant differences between vertical and horizontal moduli and Poisson's ratios. Field validation data were collected from a full-scale pavement test study conducted at Georgia Tech. The validation of the anisotropic modeling approach was accomplished by analyzing pavement test sections using GT-PAVE finite element program, predicting UAB responses, and comparing them to the measured ones. Laboratory testing of the aggregate samples was conducted at the University of Illinois and the characterization models were developed for the stress sensitive, cross-anisotropic aggregate behavior. With nonlinear anisotropic modeling of the UAB, the resilient behavior of pavement test sections was successfully predicted at the same time for a number of response variables. In addition, the stress sensitive, cross-anisotropic representation of the base was shown to greatly reduce the horizontal tension computed in the granular base when compared to a linear isotropic representation.

  • Supplemental Notes:
    • Full conference proceedings available on CD-ROM.
  • Corporate Authors:

    University of Texas, Austin

    International Center for Aggregates Research, 3208 Red River
    Austin, TX  United States  78705-2650

    Texas A&M University, College Station

    Faculty Exchange Box H
    College Station, TX  United States  77843
  • Authors:
    • Tutumluer, E
  • Conference:
  • Publication Date: 2001

Language

  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 29p

Subject/Index Terms

Filing Info

  • Accession Number: 00983582
  • Record Type: Publication
  • Report/Paper Numbers: Final Draft
  • Files: TRIS
  • Created Date: Dec 27 2004 12:00AM