Development of ODOT guidelines for the use of geogrids in aggregate bases.

A primary objective of the current study was to help the Oklahoma Department of Transportation (ODOT) expand its selection of approved geogrid products for base reinforcement applications by producing measured data on selected geogrids and a dense-graded base aggregate commonly used in ODOT roadway projects. The study involved in-isolation and in-aggregate laboratory testing of several base reinforcement geogrid products from major geosynthetic suppliers. In-isolation test included rib strength and junction strength tests, and in-aggregate tests included pullout and plate load tests. Field-scale installation damage tests were also performed. Test results on different geogrids in this study were aimed to quantify the significance of the geogrids in-isolation properties on their in-aggregate response under control conditions.