Behavior of Ultrahigh-Performance Concrete Confined by Steel
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 10
Abstract
Ultrahigh-performance concrete (UHPC) offers a superior alternative to normal-strength concrete (NSC) due to its significantly higher compressive and tensile strengths, improved ductility, and enhanced durability. This paper presents an experimental study of the stress-strain behavior of UHPC confined by conventional transverse steel reinforcement. Test results are compared with two confinement models, as well as a large amount of available data on steel-confined NSC and high-strength concrete (HSC), and limited data available for UHPC confined by fiber-reinforced polymers (FRP). The study shows a potential threshold of confinement ratio beyond which the confinement effectiveness of UHPC exceeds that of HSC and nears that of NSC. This may have implications on the minimum level of confinement reinforcement for UHPC. For the most part, steel reinforcement is more effective than FRP as the confining device for UHPC, except for the very high end of confinement ratios, where FRP may become more effective. For the same confinement ratio, steel-confined UHPC has a larger ultimate strain than FRP-confined UHPC. Of the two types of FRP, glass leads to a higher ultimate strain than carbon, primarily due to its lower elastic modulus, and hence higher deformability. Additional research on larger-scale columns can help develop requirements for confinement reinforcement of UHPC.
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Acknowledgments
This study was an extension on the project sponsored by the NSF-Network for Earthquake Engineering Simulation Research (NEESR) program, as part of the completed multiuniversity Grant No. CMS-0420347. The authors are also grateful to the support of Lafarge, Inc. for providing the UHPC materials, Ductal; and the Titan America Pennsuco Concrete Laboratory for availing their high-capacity testing facility to this project. The first author is also thankful to the Graduate School at Florida International University for providing him with a Dissertation Year Fellowship to complete his doctoral work. The views and findings reported here are those of the authors alone, and not necessarily the views of supporting agencies.
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 10 • October 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Sep 15, 2015
Accepted: Feb 23, 2016
Published online: May 23, 2016
Published in print: Oct 1, 2016
Discussion open until: Oct 23, 2016
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