Durability Performance and Service Life of CFCC Tendons Exposed to Elevated Temperature and Alkaline Environment
Publication: Journal of Composites for Construction
Volume 20, Issue 1
Abstract
This paper presents the physical, mechanical, and durability characterization of Tokyo Rope carbon fiber composite cables (CFCCs). Specimens were exposed to and alkaline solution (12.8 pH) for 1,000, 3,000, 5,000, and 7,000 h at different elevated exposure temperatures (22, 40, 50, and 60°C) to yield a simulated acceleration of the effect of a concrete environment. The durability performance of the Tokyo Rope CFCC tendons was assessed by conducting tensile tests on the specimens after different exposure periods. In addition, the microstructure of the CFCCs—both conditioned and unconditioned specimens—was investigated with scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) to assess any changes or degradation. The preexposure and postexposure tensile strengths of the conditioned and unconditioned specimens were used for long-term behavior/performance predictions based on the Arrhenius theory. The test results revealed that the average tensile strength retentions of the conditioned CFCCs could be affected by accelerated time and temperature. According to the predictions, even after a service life of 100 years, the tensile strength retention of the tested Tokyo Rope CFCC tendons would still be more than 90% at mean annual temperatures of 50°C (the mean annual temperature and the marine environment of the Middle East and warm regions) and 10°C (mean average temperature of northern regions).
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Acknowledgments
The authors would like to express their special thanks and gratitude to the Natural Science and Engineering Research Council of Canada (NSERC); the University of North Florida, Jacksonville, Florida, U.S., Florida Department of Transportation (FDOT); the technical staff of the structures laboratory at the University of Sherbrooke; and Tokyo Rope Manufacturing Co. Ltd., Japan, for providing the Tokyo Rope CFCC tendons.
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Journal of Composites for Construction
Volume 20 • Issue 1 • February 2016
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© 2015 American Society of Civil Engineers.
History
Received: Dec 9, 2014
Accepted: Jun 15, 2015
Published online: Aug 5, 2015
Discussion open until: Jan 5, 2016
Published in print: Feb 1, 2016
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