Synergy in Flexure of High-Performance Fiber-Reinforced Concrete with Hybrid Steel Fibers
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 6
Abstract
In this paper, the synergistic flexural behaviors of high-performance fiber-reinforced concrete (HPFRC) under static and cyclic loading were experimentally investigated. The HPFRCs were composed of an identical mortar matrix but different embedded fiber types and contents as follows: HPFRC0 (no fiber, 0.0% by volume), HPFRC1 (macro steel fiber, 1.5% by volume), HPFRC2 (micro steel fiber, 1.5% by volume), and HPFRC3 (hybrid fiber, 1.0% by volume macro steel fiber blended with 0.5% by volume micro steel fiber). All flexural specimens with the dimensions of were tested under static and cyclic loading using a three-point bending fixture. The HPFRCs with embedded fibers demonstrated the clear enhancements in static flexural resistances of up to 3.54 times higher in flexural strength and 2.16 times higher in deflection capacity in comparison with the plain HPFRC. Under cyclic loading, the fatigue stress ratio, defined as the ratio of the fatigue stress amplitude to the static flexural strength, was changed to perform the fatigue behaviors of the HPFRCs. The endurance limits of the HPFRCs were observed more than 10,000 cycles at the fatigue stress ratio of 0.15, and exceeded 1,000 cycles at the fatigue stress ratio of 0.5. The order of the HPFRC series in terms of static flexural strength, static deflection capacity and fatigue life at the stress amplitudes more than 5 MPa were as follows: HPFRC3 > HPFRC2 > HPFRC1 > HPFRC0. A synergy behavior of the HPFRCs was observed for static flexural strength, static deflection capacity, and fatigue life with the stress amplitude more than 5 MPa. In addition, two models of the fatigue responses of the HPFRCs were built to predict the fatigue life of the HPFRCs according to applied cyclic load.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work belongs to the project Grant No. B2021-SPK-08 funded by Ministry of Education and Training, and hosted by Ho Chi Minh City University of Technology and Education, Vietnam. The authors are grateful for the financial support. The opinions expressed in this paper are those of the authors and do not necessarily reflect the views of the sponsors.
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Journal of Materials in Civil Engineering
Volume 34 • Issue 6 • June 2022
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© 2022 American Society of Civil Engineers.
History
Received: Jun 9, 2021
Accepted: Oct 1, 2021
Published online: Mar 18, 2022
Published in print: Jun 1, 2022
Discussion open until: Aug 18, 2022
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