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i

Evaluation of the Base/Subgrade Soil under Repeated Loading : Phase I – Laboratory Testing and Numerical Modeling of Geogrid Reinforced Bases in Flexible Pavement

Filetype[PDF-1.45 MB]


  • English
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    Details:

    • Creators:
    • Corporate Creators:
      Louisiana State University (Baton Rouge, La.). Department of Civil and Environmental Engineering
    • Subject/TRT Terms:
    • Publication/ Report Number:
      FHWA/LA.09/450
    • Resource Type:
      Tech Report
    • Geographical Coverage:
      Louisiana
    • OCLC Number:
      682160650
    • Edition:
      Interim report; Aug. 2003-May 2007.
    • Corporate Publisher:
      Louisiana Transportation Research Center
    • NTL Classification:
      NTL-HIGHWAY/ROAD TRANSPORTATION-Materials;NTL-HIGHWAY/ROAD TRANSPORTATION-Soils and Geology;
    • Abstract:
      This report documents the results of a study that was conducted to characterize the behavior of geogrid reinforced base

      course materials. The research was conducted through an experimental testing and numerical modeling programs. The

      experimental testing program included performing different laboratory tests to evaluate the effect of various factors on the

      performance geogrid reinforced base course materials. Finite element models were also developed to investigate the

      benefits of placing geogrids within the base course layer in a flexible pavement structure. The results of the experimental

      testing demonstrated that the inclusion of the geogrid reinforcement layer(s) improved the compressive strength and

      stiffness of base course materials under static loading. This improvement was more pronounced at higher strain levels.

      Furthermore, the results showed that the geogrid significantly reduced the base course material permanent deformation

      under cyclic loading, but it did not show appreciable effect on their resilient deformation. The finite modeling program

      showed that the geogrid reinforcement reduced the lateral, vertical, and shear strains within the base course and subgrade

      layers. Furthermore, the geogrid had an appreciable reduction in permanent deformation for pavement sections built on

      top of weak subgrade soils with medium to thin base layer thickness, with the thin base layer thickness showing greater

      values of improvement. However, negligible to modest reinforcement effect on permanent deformation was obtained for

      sections having a firm subgrade or thick base layer thickness. The geogrid reinforcement had modest to high values of

      improvement in fatigue life of pavement structure.

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