Behavior of Strain Hardening Cementitious Composites in Flexure/Shear
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 10
Abstract
The new generation of fiber-reinforced cementitious composites made with polyvinyl alcohol fibers and high amounts of fly ash shows advantageous mechanical properties in terms of very high tensile strain capacity and ductility. The challenge that remains is to establish pertinent new design rules and analysis procedures and to adapt existing ones specifically tailored to structures made of these materials. In this direction, four-point bending tests were conducted on scaled beam specimens considering several values of shear span aspect ratio in order to determine the behavior of this novel ductile concrete in shear. Tests were conducted on mixes with and without longitudinal and shear reinforcement. It was found that the fiber content had a significant effect on all aspects of mechanical behavior, in terms of strength and ductility. The strength of fiber-reinforced composite beams with longitudinal reinforcement in shear and flexure was interpreted using mechanistic models that rely on the classical beam theory and the strut-and-tie approach. The independent contributions to shear resistance of the fiber-reinforced web, longitudinal reinforcement anchored beyond the critical shear crack, and transverse reinforcement were calibrated to the experimental results in order to establish procedures for evaluating the structural performance of this innovative cementitious material.
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Acknowledgments
The authors would like to gratefully acknowledge Kuraray Europe GmbH for their generous supply of the PVA fibers for this research. All experiments were conducted in the facilities of the University of Cyprus. The assistance provided by Special Scientist Dr. N. Archontas in mixing and casting of the specimens is gratefully appreciated. The first author gratefully acknowledges the scholarship provided by the University of Cyprus during her last year of doctoral studies, which enabled the completion of the experiments presented.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 10 • October 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Dec 12, 2016
Accepted: Apr 14, 2017
Published online: Jul 22, 2017
Published in print: Oct 1, 2017
Discussion open until: Dec 22, 2017
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