CFRP Prestressed High-Strength Concrete Prisms Subjected to Direct Tension
Publication: Journal of Composites for Construction
Volume 12, Issue 6
Abstract
This paper describes the behavior of carbon fiber-reinforced polymer (CFRP) prestressed high-strength concrete prisms under direct tension. Seven prestressed concrete prisms with different levels of prestressing were cast and tested. Prisms were in cross section and their lengths varied between 1,400 and . Concrete compressive strength was as high as . Tension stiffening, crack width, and crack spacing in prisms were investigated. Concrete properties, such as the stress–strain relationship under direct tension and bond strength, were also determined. Test results revealed that tension stiffening in CFRP prestressed high-strength concrete is significant when higher concrete strength and higher prestressing level are applied. Tension stiffening factors are proposed based on the postcracking behavior of concrete. Experimental results also showed that increasing the prestressing level increases the amount of tension stiffening and reduces the number of cracks, which delays their appearance. However, cracks widened at a faster rate in the prisms with higher prestressing levels. Experimental results were compared with Comite Euro-International du Beton and American Concrete Institute proposed equations. Modifications were suggested for the above-mentioned equations to account for use of CFRP bars in prestressed sections.
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Acknowledgments
The writers would like to acknowledge NSERC for financial support, the technical staff of the heavy structures laboratory at the University of Manitoba, and LAFARGE Canada.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 12 • Issue 6 • December 2008
Pages: 588 - 595
Copyright
© 2008 ASCE.
History
Received: May 24, 2007
Accepted: Sep 24, 2007
Published online: Dec 1, 2008
Published in print: Dec 2008
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