Accelerated Full-Scale Testing of Geogrid-Reinforced Flexible Pavements

Nine instrumented geogrid-reinforced flexible pavement test sections were constructed at the University of Illinois Advanced Transportation Research and Engineering Laboratory (ATREL). The primary objective of this research was to quantify the effectiveness of geogrid base reinforcement when used in low-volume conventional flexible pavements. The subgrade soil California Bearing Ratio (CBR) was maintained below 4% for all sections. The nine test sections were divided into three categories based on the base course thicknesses of the unbound aggregate ranging from 203mm (8in) to 457mm (18in). The hot-mix asphalt (HMA) layer thickness was maintained at 76mm (3in) for all the full-scale sections except for one test section constructed at 127mm (5in) thickness. Test sections were instrumented for measuring pavement responses to vehicular axle and environmental loadings. A total of 173 instruments were placed in the pavement layers during construction. The load-associated response instruments were placed in the center of the lane, where the wheel loading was planned, while environmental-response instruments were installed at 0.9m (3ft) from the centerline. One hundred percent instrumentation survivability was achieved after construction. Test sections were loaded by the Accelerated Transportation Loading ASsembly (ATLAS). Preliminary instrument response analysis showed that the control section had significantly greater longitudinal (in direction of traffic) aggregate movement, compared to reinforced sections. That was mainly evident after shear failure, of the subgrade, which resulted in higher surface rutting and HMA surface cracking at 150mm (6in) of the loading-tire edges. The subgrade shear failure, which was identified by visual survey after section excavation, was more pronounced in the control section.

Language

  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; References; Tables;
  • Pagination: 27p
  • Monograph Title: TRB 86th Annual Meeting Compendium of Papers CD-ROM

Subject/Index Terms

Filing Info

  • Accession Number: 01044060
  • Record Type: Publication
  • Report/Paper Numbers: 07-2317
  • Files: TRIS, TRB
  • Created Date: Feb 8 2007 7:00PM