Flexural and Shear Behavior of Reinforced Concrete Members Strengthened with a Discrete Fiber-Reinforced Polyurea System
Publication: Journal of Composites for Construction
Volume 17, Issue 1
Abstract
Recent research has been conducted to evaluate the benefits provided by externally-applied discrete fiber-reinforced polyurea (DFRP) coating systems. This coating was proposed to allow for ease of construction in repair-retrofit situations and to provide multihazard benefits, ranging from blast or impact fragmentation mitigation to seismic reinforcement and general strengthening. This phase of research investigated the flexural and shear reinforcement capabilities of the systems. Testing parameters included type of structural failure, polyurea, and fiber volume fraction. Additionally, the effects of the thickness of the composite system were considered. Concrete beam specimens were fabricated and coated per the designed test matrix and subjected to four-point bending. Analysis was based on ultimate capacity, deflection, overall ductility, and the qualitative observations of coating adhesion and fragmentation confinement. In addition, a theoretical model was developed and validated to describe the flexural behavior of the polyurea-coated beams and to normalize the test data for comparison. Results presented in this paper suggest measurable strengthening for both flexural and shear capacity provided by the coating system and substantial gains in ductility.
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Acknowledgments
This research work was funded in part by the Awareness and Localization of Explosives-Related Threats (ALERT) Program supported by the U.S. Department of Homeland Security, and the writers wish to express gratitude for this support. The writers would also like to thank the support staff in the Center for Infrastructure Engineering Studies (CIES) and the Department of Civil, Architectural and Environmental Engineering at Missouri S&T for their valuable contributions and LINE-X in Columbia, Missouri for their assistance.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 17 • Issue 1 • February 2013
Pages: 108 - 116
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Feb 24, 2012
Accepted: Jul 23, 2012
Published online: Aug 7, 2012
Published in print: Feb 1, 2013
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