A series of in-isolation tensile tests and pullout tests were carried out to examine the influence of fabrication technique and selected index properties of geogrids on their in-aggregate performance. The geogrids in this study were selected following a comprehensive survey of commonly used geogrids in highway projects in the United States. The dense-graded base aggregate used in this study (i.e. ODOT Type-A) is the most commonly used aggregate in Oklahoma highway projects. The in-isolation tests showed that the extruded geogrids have greater junction strengths than the non-extruded geogrids. Based on the pullout test data, it was observed that a higher junction strength value results in a better in-aggregate performance. The pullout force was found to be directly correlated with the rib strength values at 2% and more closely at 5% strain levels. Also, it was found that the pullout force of the non-extruded geogrids was more sensitive to the junction strength than that of extruded geogrids. Correlations were also developed between geogrids index properties and their pullout performance.
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