Full-Scale Testing of Remediated Geosynthetic-Stabilized Roadways

ABSTRACT: The University of Saskatchewan has studied variable aperture shaped geogrids for stabilization, amid concerns over diminishing quality aggregate materials in the Canadian Prairies. Geogrids have proven effective in research for their ability to interlock with aggregate particles and restrict the lateral movement over repeated traffic loads. To continue this study, full-scale traffic simulations were conducted at the MOST Facility with variable aperture-shaped geogrids, using a one-of-a-kind apparatus. This research assessed geosynthetic stabilization effectiveness over soft subgrades, focusing on performance after remediation in unpaved roads. Subsequent trafficking following failure evaluated stiffness changes once tension was mobilised in the geogrid. These experiments used a 600 mm kaolinite subgrade layer and various aggregates up to 300 mm thick, such as crushed basalt, well-graded sand, and recycled concrete. Results revealed a significant increase in overall stiffness and a notable change in recoverable deformation rates in geogrid-stabilized sections compared to unstabilised controls, demonstrating the advantages of mechanical stabilization for repeated roadway remediation.