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A Study on the Mechanical Properties of the Hybrid Fiber-Reinforced Mortar Using the Macro Steel and Micro Carbon Fibers
American Journal of Civil Engineering
Volume 8, Issue 6, November 2020, Pages: 128-138
Received: Oct. 29, 2020; Accepted: Nov. 12, 2020; Published: Nov. 19, 2020
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Authors
Gwang Hee Heo, Department of International Civil and Plant Engineering, Konyang University, Nonsan, Republic of Korea
Jong Gun Park, Public Safety Research Center (PSRC), Konyang University, Nonsan, Republic of Korea
Hyung Min Jun, Department of Disaster and Safety Engineering, Konyang University, Nonsan, Republic of Korea
Dong Ju Seo, Moowang Construction, Iksan, Republic of Korea
Sung Gon Koh, Department of Cadastre & Civil Engineering, Jeonju Vision College, Jeonju, Republic of Korea
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Abstract
In the present study, an experiment was conducted to investigate the mechanical properties such as fluidity, compressive strength and flexural performance (flexural strength and toughness) of a single fiber-reinforced mortar (FRM) using only macro steel fiber (SF) or micro carbon fiber (CF) with different material properties and SF-CF hybrid FRM using a mixture of macro SF and micro CF. The specimens incorporated macro SF and micro CF in the mix proportions of 100-0%, 75-25%, 50-50%, 25-75% and 0-100% by volume at a total fiber volume fraction of 1.0%. Their mechanical properties were further compared and reviewed with the plain mortar at 28 days of age. The experimental results of fresh mortar showed that the table flow of mortar using only macro SF was slightly reduced compared to plain mortar, whereas the table flow of mortar using only micro CF and SF-CF hybrid mortar decreased significantly with increase of micro CF. It was revealed from the test of the hardened mortar that the SF-CF=75-25% (M3) specimen showed the highest compressive and flexural strength, and the SF-CF=50-50% (M6) specimen obtained the highest flexural toughness. Therefore, it was possible to confirm the synergistic reinforcement effect of that enhanced the strength and improved the flexural performance by hybrid of macro SF and micro CF. Based on the results of this experiment, the optimal mix proportion of SF-CF hybrid FRM is proposed in this paper to improve the compressive strength, flexural strength and flexural toughness.
Keywords
Macro Steel Fiber, Micro Carbon Fiber, Hybrid Fiber-Reinforced Mortar, Flexural Performance, Fluidity
To cite this article
Gwang Hee Heo, Jong Gun Park, Hyung Min Jun, Dong Ju Seo, Sung Gon Koh, A Study on the Mechanical Properties of the Hybrid Fiber-Reinforced Mortar Using the Macro Steel and Micro Carbon Fibers, American Journal of Civil Engineering. Vol. 8, No. 6, 2020, pp. 128-138. doi: 10.11648/j.ajce.20200806.11
Copyright
Copyright © 2020 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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