Durability of geogrid reinforcement from a sloped retaining wall after 25 years in-service

Abstract

This study presents a durability assessment of geogrid samples that were exhumed from a sloped retaining wall 25 years after completion of construction. The durability assessment is based on visual inspection and a series of index and strength tests, focusing on the identification of possible physical damage and/or degradation. The assessment lends confidence in the use of isochronous load-strain-time data for predicting the long-term strain of geogrid reinforced soil structures for design practice. This research belongs to the few well-documented long-term studies on geogrid durability.