What should I ask for in comparing geogrids for subgrade stabilization?
Performance is not based on index properties of the geogrid, measured in a lab. It is determined empirically, using full-scale in-ground trafficking testing. Request a copy of the design inputs and the design method which were used as the basis of equivalency. Also ask for the full-scale testing, with the specific product being submitted (not another “similar product”), and documentation from an independent authority verifying that the testing and calibration were performed properly. Once you have this information, you will be able to compare performance related sections and evaluate equivalency.