Inverted base pavements : new field test and design catalogue.

Details

• Creators:
  Santamarina, J. Carlos
• Corporate Creators:
  Georgia Institute of Technology
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Base course (Pavements)
  • Granular bases
  • Pavement maintenance
  • Costs
  • Finite element method
  • Field tests
  • Stiffness
  • Pavement performance
• Publication/ Report Number:
  RP 11-28
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  Georgia. Department of Transportation. Office of Research
• Abstract:
  The current economic situation has severely affected the US road infrastructure and funding has become ; inadequate for either maintenance or future growth. ; The inverted base pavement structure is a promising alternative to achieve high quality roads at considerably ; lower cost than conventional pavements. The proximity of the unbound granular base layer to the tire load ; makes the response of the granular base critical to the performance of the pavement structure. Therefore ; extensive material characterization is conducted on the granular materials that make the base. In particular, a ; true triaxial chamber is developed to study the mechanical response and the stress-dependent stiffness of ; granular bases. ; A novel method is developed to assess the as-built stress-dependent anisotropic stiffness of granular bases insitu ; using both crosshole and uphole test configurations. The two inverted base pavements built in Georgia at ; the Morgan County quarry haul road and the Lagrange south Loop are tested as part of this study. ; A nonlinear orthotropic constitutive model is selected to capture the deformational behavior of compacted ; granular bases. The response of the pavement is analyzed by implementing this constitutive behavior in a ; three-dimensional finite-element model. Different pavement structures are simulated. It is shown that thin ; asphalt concrete layers resting directly on granular bases deform as membranes. ; Finally, numerical simulations are extended to compare inverted base pavements to conventional pavements ; used in practice. Results highlight the inadequacy of ASSHTO’s structural layer coefficient for the analysis of ; inverted base pavement structures as well as the potential economic advantages of inverted base pavements
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28649/dot_28649_DS1.pdf
• File Type:
  [PDF - 1.71 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:23ef6533aab739375eb339077253e707748ed600ffc72b7ee993b15503677981