AASHTO R 69-15 (2019) PDF Download

The AASHTO R 69-15 (2019) standard provides a set of procedures for determining the long-term strength and stiffness of geosynthetic reinforcements. The standard includes test and evaluation methods to determine reduction factors for installation damage, creep, and chemical/biological durability. These factors are then combined to determine the long-term strength of the geosynthetic reinforcement.

Specifically, the standard focuses on geosynthetics made of polypropylene (PP), polyethylene (PE or HDPE), and polyester (PET), such as geotextiles and geogrids. For other geosynthetic polymers like polyamide (PA) or polyvinyl alcohol (PVA), the installation damage and creep protocols provided in the standard can be directly applied. However, additional investigation is needed to develop detailed protocols and acceptance criteria for the chemical and biological durability of these other polymers.