Axial Compression Behavior of Fire-Damaged Concrete Cylinders Confined with CFRP Sheets
Publication: Journal of Composites for Construction
Volume 20, Issue 5
Abstract
This paper presents the axial compression behavior of standard concrete cylinders after exposure to elevated temperatures of 300, 500, and 700°C for heating periods of 2 h (for all temperatures) and 3 h (only for 700°C). A total of 192 specimens were tested in static compression to investigate the stress-strain relationships and failure modes of fire-damaged concrete before and after strengthening with carbon fiber–reinforced polymer (CFRP) wraps. The test results showed that the exposure temperature and duration, unconfined concrete strength, and cooling method (air or water cooling) influence the postfire compressive strength, strain at compressive strength, and modulus of elasticity of concrete. Low-strength concrete is more susceptible to the loss in residual properties caused by fire than high-strength concrete. The CFRP wrapping can significantly enhance both strength and ductility of concrete after exposure to elevated temperatures. The level of strength enhancement by CFRP confinement for fire-damaged concrete is higher than undamaged concrete. The confinement effectiveness increases with an exposure temperature, especially for the lowest-strength (20-MPa) water-cooled concrete. In contrast, the level of ductility enhancement on fire-damaged concrete is lower than undamaged concrete. The application of an equation to predict the compressive strength of CFRP-confined fire-damaged concrete is also discussed. It was found that the equation conservatively predicts the ultimate strength of CFRP-confined fire-damaged concrete. However, the prediction becomes less accurate as exposure temperature increases.
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Acknowledgments
The authors would like to acknowledge Sika (Thailand), Co. Ltd., for supplying the CFRP strengthening system used in the experiments.
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Published In
Journal of Composites for Construction
Volume 20 • Issue 5 • October 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Aug 29, 2015
Accepted: Dec 28, 2015
Published online: Mar 8, 2016
Discussion open until: Aug 8, 2016
Published in print: Oct 1, 2016
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