Creep Mechanisms in Precracked Polypropylene and Steel Fiber–Reinforced Concrete
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 8
Abstract
Recently, fiber-reinforced concrete (FRC) creep behavior has become a much addressed topic, and the main gap found in the literature is whether cracked FRC is stable in the serviceability limit state. Therefore, this work aims to investigate the creep behavior of steel and polypropylene (PP) FRC by analyzing the growth of the crack opening displacement over time in prismatic specimens subjected to sustained bending. Sustained load tests were also performed on FRC constituents and on the fiber matrix interface in order to evaluate individually their long-term response, and to understand their contribution in bending. Based on a model proposed, the rotation in a plastic hinge located in the crack area could be calculated considering the three mechanisms evaluated—fiber pullout, concrete compression, and shrinkage. It could be concluded that the fiber pullout mechanism plays a primary role in creep deformation in precracked elements subjected to sustained bending loads.
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Acknowledgments
This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001 and by Brazilian funding agencies FAPERJ and CNPq.
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 8 • August 2021
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© 2021 American Society of Civil Engineers.
History
Received: Jan 31, 2020
Accepted: Nov 24, 2020
Published online: May 24, 2021
Published in print: Aug 1, 2021
Discussion open until: Oct 24, 2021
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