Development of an accelerated creep testing procedure for geosynthetics.
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Development of an accelerated creep testing procedure for geosynthetics.

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      The report presents a procedure for predicting creep strains of geosynthetics using creep tests at elevated temperatures. Creep testing equipment was constructed and tests were performed on two types of geosynthetics: High Density Polyethylene (HDPE) geogrid, and Polyester (PET) geogrid) typically used in soil reinforcement applications.

      The procedure for extrapolating creep strains from elevated temperature tests using the Arrhenius Equation was evaluated. The results showed limitations associated with the estimation of the equation parameters and the corresponding predictions of creep strains.

      The testing program and analysis demonstrated the applicability of applying the shift factors to the HDPE geogrid to predict the response at longer time intervals. The analysis was applicable to creep loads lower than 40 percent Tmax for the PET geogrid, the increase of creep strains at elevated temperatures was not sufficient to successfully establish the master curves in a form consistent with the WLF equation. This is mainly due to fact that creep tests were perofrmed at temperatures close to the glass-transition temperature of the PET geogrid (75C). Tests at higher temperatures would be required to obtain more measurable response of creep strains and to evaluate the applicability of temperature-shift factors in predicting creep strains for the PET geogrid.

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