Performance Verification of a Geogrid Mechanically Stabilized Layer Flexible Pavement Design As Part of the La Media Road Widening Project

A field study was performed to document the benefit of a punched and drawn polypropylene triaxial geogrid. The triaxial geogrids have triangular apertures and increased rib thickness as compared to many geogrids with square apertures. These fundamental changes to the geogrid structure, coupled with high junction efficiency, gives greatly improved aggregate confinement and interaction, leading to improved structural performance of the mechanically stabilized layer (MSL). The project consisted of the widening of La Media Road as part of the Highway 905 improvements. La Media Road and Highway 905 typically experience heavy truck traffic loads from the Mexico/U.S. border crossing. The subgrade material beneath La Media Road is comprised of clayey sand and clayey sand with gravel. Additionally, cobbles ranging up to about 8 inches in diameter were observed on the surface of the subgrade. R-Values of 21 and 24 were determined for the subgrade material. Laboratory testing included grain size analysis, Atterberg limits, maximum density, optimum moisture content and R-Value tests. The field-testing consisted of 5-inch diameter plate load tests on the subgrade and at various levels of the pavement cross-section. Results of plate load testing indicate that the triaxial geogrid increased the modulus of the mechanically stabilized section relative to the conventional unbound aggregate pavement section. The measured improvement of the MSL sections ranged between 27% and 52% greater than the 30% thicker unbound aggregate conventional design section.

Language

  • English

Media Info

  • Media Type: Web
  • Pagination: pp 1391-1399
  • Monograph Title: GeoCongress 2012: State of the Art and Practice in Geotechnical Engineering

Subject/Index Terms

Filing Info

  • Accession Number: 01530373
  • Record Type: Publication
  • ISBN: 9780784412121
  • Files: TRIS, ASCE
  • Created Date: Nov 12 2013 2:04PM