Effect of Severe Environmental Exposures on CFRP Wrapped Concrete Columns
Publication: Journal of Composites for Construction
Volume 14, Issue 1
Abstract
Deterioration of concrete structures caused by corrosion of reinforcing steel, aging, and weathering is a major problem in harsh environments such as coastal areas and cold regions. In addition, a hot environment, such as in the Arabian Gulf, is recognized as one of the most severe and aggressive environments that affects concrete durability. The purpose of this study is to investigate the effectiveness of strengthening plain concrete cylinders, subjected to extreme temperature variations, by wrapping with two layers of unidirectional carbon fiber-reinforced polymer (CFRP) sheets. Thirty-six plain concrete cylinders were tested. Nine specimens served as unstrengthened controls and the remaining cylinders were strengthened with two layers of CFRP sheets. Cylinders were subjected to high temperatures , to heating and cooling cycles (23 to ), and to prolonged heat exposure . Some of the cylinders that were subjected to heating and cooling, were later subjected to freezing and thawing cycles, while others were submerged in fresh water or salt water. The specimens were loaded to failure under uniaxial compressive load and the axial and lateral deformations were monitored. High temperature exposure was not found to decrease the strength of the wrapped concrete cylinders.
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Acknowledgments
The writers wish to acknowledge the support of the Department of National Defense (DND) of Canada through the Military Engineering Research Group (MERG) at the Royal Military College of Canada (RMC), and the Natural Sciences and Engineering Research Council (NSERC) of Canada. The writers are members of the Intelligent Sensing for Innovative Structures Network (ISIS Canada) and wish to acknowledge the support of the Networks of Centres of Excellence Program of the Government of Canada. Assistance from the technical staffs at RMC, Mr. D. Hamilton and Mr. W. Mackenzie is gratefully acknowledged.
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© 2010 ASCE.
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Received: Jul 5, 2008
Accepted: Sep 3, 2009
Published online: Jan 15, 2010
Published in print: Feb 2010
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