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Service life prediction of GFRP rebars in an alkaline environment
This study proposes a model that predicts the degradation of a GFRP rebar exposed to an alkaline environment, and based on this estimate, predicts the service life of the GFRP rebar. The alkaline environment was a pH 12.6 solution of 0.16 % calcium hydroxide, 1 % sodium hydroxide, and 1.4 % potassium hydroxide, and the GFRP rebar was immersed for 300 days. We performed a tensile test to measure the degradation. The measured tensile strength for each time period was the remaining residual tensile strength (as a percentage) of the reinforcing GFRP rebar under a controlled state. The time shift factor was taken as the time at which the residual tensile strength was 80 % of the control strength. A rebar immersed in an alkaline solution for 300 days at 80 C was calculated to have a TSF of 13,125 days, or about 36 years, under normal South Korean regional conditions, based on the statistics of Korea's mean annual temperature. This study provides a more appropriate model for the environment of Korea than the one suggested by Dejke.
Service life prediction of GFRP rebars in an alkaline environment
This study proposes a model that predicts the degradation of a GFRP rebar exposed to an alkaline environment, and based on this estimate, predicts the service life of the GFRP rebar. The alkaline environment was a pH 12.6 solution of 0.16 % calcium hydroxide, 1 % sodium hydroxide, and 1.4 % potassium hydroxide, and the GFRP rebar was immersed for 300 days. We performed a tensile test to measure the degradation. The measured tensile strength for each time period was the remaining residual tensile strength (as a percentage) of the reinforcing GFRP rebar under a controlled state. The time shift factor was taken as the time at which the residual tensile strength was 80 % of the control strength. A rebar immersed in an alkaline solution for 300 days at 80 C was calculated to have a TSF of 13,125 days, or about 36 years, under normal South Korean regional conditions, based on the statistics of Korea's mean annual temperature. This study provides a more appropriate model for the environment of Korea than the one suggested by Dejke.
Service life prediction of GFRP rebars in an alkaline environment
Lebensdauervoraussagen von Glasfaser verstärkten Kunststoffen als Betonverstärkung in alkalischer Umgebung
Won, Jong-Pil (author) / Lee, Sun-Jin (author) / Jang, Chang-Il (author) / Won, Cheol (author)
Polymers and Polymer Composites ; 15 ; 475-479
2007
5 Seiten, 4 Bilder, 11 Quellen
Article (Journal)
English
Service Life Prediction of GFRP Rebars in an Alkaline Environment
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