The objective of this study is to identify mechanical and physical geogrid properties critical to performance in geogrid-reinforced pavements. Properties such as aperture size, wide-width tensile strength, and junction strength of several geogrid types are determined from laboratory index testing. Performance tests, including direct shear and pullout, are performed to investigate the interaction characteristics of the soil-geogrid interface. Correlations are made between the geogrid index properties and performance test results to identify the critical properties that have the most impact on performance. Analysis reveals a strong relationship between performance and junction and tensile strength of geogrids at moderate strain levels, and aperture size has a positive correlation with pullout results. Such findings aid in selection of appropriate geogrid types for subgrade reinforcement purposes and prediction of performance in the field based on index properties.
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