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Tensile Performance Test Research of Hybrid Steel Fiber—Reinforced Self-Compacting Concrete

Notched beam specimens were loaded by the three-point bending test device, and the effects of different volume contents and combinations of steel fibers on the tensile properties of hybrid steel fiber–reinforced self-compacting concrete (HSFRSCC) were studied. The failure law and strain field distri...

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Detalles Bibliográficos
Autores principales: Gong, Chenjie, Kang, Lei, Zhou, Wenhan, Liu, Linghui, Lei, Mingfeng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9919092/
https://www.ncbi.nlm.nih.gov/pubmed/36770121
http://dx.doi.org/10.3390/ma16031114
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author Gong, Chenjie
Kang, Lei
Zhou, Wenhan
Liu, Linghui
Lei, Mingfeng
author_facet Gong, Chenjie
Kang, Lei
Zhou, Wenhan
Liu, Linghui
Lei, Mingfeng
author_sort Gong, Chenjie
collection PubMed
description Notched beam specimens were loaded by the three-point bending test device, and the effects of different volume contents and combinations of steel fibers on the tensile properties of hybrid steel fiber–reinforced self-compacting concrete (HSFRSCC) were studied. The failure law and strain field distribution of the specimens were studied by digital image correlation (DIC) technology. Moreover, the curves between the load and crack mouth opening displacement (CMOD) of 18 groups of hybrid steel fiber–reinforced concrete specimens were obtained, and the stress–strain curves of 18 groups of specimens were derived from the load–CMOD curves. The results show that both single and hybrid steel fibers can improve the crack deformation resistance and tensile properties of concrete, but hybrid steel fibers have a more significant improvement effect. Only when the content of steel fiber is more than 0.6% can it have a more obvious postpeak descending section, and hybrid steel fiber has higher postpeak deformation capacity and flexural toughness. The fundamental reason why concrete with hybrid steel fibers has better tensile properties is that micro and macro steel fibers cooperate with each other to resist cracks, improving the toughness of concrete after cracking. Finally, the mechanism of different size and volume content of steel fiber was analyzed from the micro level, which can be used as a reference for the engineering design of HSFRSCC in the future.
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spelling pubmed-99190922023-02-12 Tensile Performance Test Research of Hybrid Steel Fiber—Reinforced Self-Compacting Concrete Gong, Chenjie Kang, Lei Zhou, Wenhan Liu, Linghui Lei, Mingfeng Materials (Basel) Article Notched beam specimens were loaded by the three-point bending test device, and the effects of different volume contents and combinations of steel fibers on the tensile properties of hybrid steel fiber–reinforced self-compacting concrete (HSFRSCC) were studied. The failure law and strain field distribution of the specimens were studied by digital image correlation (DIC) technology. Moreover, the curves between the load and crack mouth opening displacement (CMOD) of 18 groups of hybrid steel fiber–reinforced concrete specimens were obtained, and the stress–strain curves of 18 groups of specimens were derived from the load–CMOD curves. The results show that both single and hybrid steel fibers can improve the crack deformation resistance and tensile properties of concrete, but hybrid steel fibers have a more significant improvement effect. Only when the content of steel fiber is more than 0.6% can it have a more obvious postpeak descending section, and hybrid steel fiber has higher postpeak deformation capacity and flexural toughness. The fundamental reason why concrete with hybrid steel fibers has better tensile properties is that micro and macro steel fibers cooperate with each other to resist cracks, improving the toughness of concrete after cracking. Finally, the mechanism of different size and volume content of steel fiber was analyzed from the micro level, which can be used as a reference for the engineering design of HSFRSCC in the future. MDPI 2023-01-27 /pmc/articles/PMC9919092/ /pubmed/36770121 http://dx.doi.org/10.3390/ma16031114 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Gong, Chenjie
Kang, Lei
Zhou, Wenhan
Liu, Linghui
Lei, Mingfeng
Tensile Performance Test Research of Hybrid Steel Fiber—Reinforced Self-Compacting Concrete
title Tensile Performance Test Research of Hybrid Steel Fiber—Reinforced Self-Compacting Concrete
title_full Tensile Performance Test Research of Hybrid Steel Fiber—Reinforced Self-Compacting Concrete
title_fullStr Tensile Performance Test Research of Hybrid Steel Fiber—Reinforced Self-Compacting Concrete
title_full_unstemmed Tensile Performance Test Research of Hybrid Steel Fiber—Reinforced Self-Compacting Concrete
title_short Tensile Performance Test Research of Hybrid Steel Fiber—Reinforced Self-Compacting Concrete
title_sort tensile performance test research of hybrid steel fiber—reinforced self-compacting concrete
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9919092/
https://www.ncbi.nlm.nih.gov/pubmed/36770121
http://dx.doi.org/10.3390/ma16031114
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AT liulinghui tensileperformancetestresearchofhybridsteelfiberreinforcedselfcompactingconcrete
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