Discussion of "Influence of Geogrid Properties on Rutting and Stress Distribution in Reinforced Flexible Pavements under Repetitive Wheel Loading" by Ramu Baadiga, Umashankar Balunaini, Sireesh Saride, and Madhira R. Madhav.

The authors stated that for the pavement section overlying fair subgrade (5% CBR) and reinforced with same polymeric PET material (GG2 and GG3), the lower tensile strength geogrid GG2 performed better than GG3. Geogrid reinforcement of highway pavement layers has gained wide acceptance over the years as a strengthening method to offset problems associated with their inability to provide support to overlying and underlying layers, resulting in the instability of the overall pavement system from shear failure and excessive permanent deformation, or rutting, both of which often result in poor pavement rideability with a possible resultant penalty in motor vehicle repairs and accidents. As noted by Koerner ([1]) there are three types of geogrid currently available: (1) unitized polypropylene (PP), (2) coated polyester (PET) or polyvinyl alcohol (PVA) yarns, and (3) PET or PP bonded straps or rods. [Extracted from the article]