Usually, the tensile properties of geogrid are affected by the creep, installation damage, chemicals etc. So, the long-term design strength of the geogrid reinforcement is reduced by these reduction factors. GRI-GG4 presented that total reduction factor is simply multiplication of each factors. But in fact these reduction factors are complexly affected to long-term properties and one factor can affect to another. In this paper, installation damage test, creep test and chemical resistance test was carried out individually and combinedly and reduction factors were analyzed. Un-notched WBG-6 remained unchanged when it was exposed to pH=9 at 50 for 4 months, but notched WBG-6 slightly decreased. Chemical resistance decreased followed by installation damage, while the effect is very limited in real environment. Combined reduction factor of installation damage and creep is lower than that of calculated value. Total reduction factor of installation damage, chemical degradation and creep is lower than that of calculated value according to GRI GG-4.
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