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Hybrid-Fiber-Reinforced Concrete Used in Frozen Shaft Lining Structure in Coal Mines

To address the cracking and leaking of concrete in frozen shaft linings in deep and thick topsoil layers in coal mines, hybrid-fiber-reinforced concrete (HFRC) was developed. First, the composition of the reference concrete was obtained by investigating high-strength concrete commonly used in shaft...

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Autores principales: Yao, Zhishu, Li, Xiang, Wu, Taoli, Yang, Long, Liu, Xiaohu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6926848/
https://www.ncbi.nlm.nih.gov/pubmed/31810158
http://dx.doi.org/10.3390/ma12233988
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author Yao, Zhishu
Li, Xiang
Wu, Taoli
Yang, Long
Liu, Xiaohu
author_facet Yao, Zhishu
Li, Xiang
Wu, Taoli
Yang, Long
Liu, Xiaohu
author_sort Yao, Zhishu
collection PubMed
description To address the cracking and leaking of concrete in frozen shaft linings in deep and thick topsoil layers in coal mines, hybrid-fiber-reinforced concrete (HFRC) was developed. First, the composition of the reference concrete was obtained by investigating high-strength concrete commonly used in shaft linings, and two dosages of polyvinyl alcohol fiber (PVAF) and polypropylene plastic steel fiber (PPSF) were obtained by the mixing test. Then, tests of early cracks of concrete were conducted; results showed that HFRC could almost avoid early cracks, exhibiting an advantage in early crack resistance. Thus, HFRC can play a significant role in improving the durability of frozen shaft linings in complex underground environments. Furthermore, a series of mechanical property tests were carried out. The results showed that the compressive strength of HFRC was similar to that of the reference concrete, but the tensile and flexural strength of HFRC was 42.7% and 35.1% higher than that of the reference concrete, respectively. Finally, an analog simulation model test of shaft linings was conducted. The new type of shaft lining structure containing hybrid fibers (HFs) exhibited plastic deformation characteristics under load, and the maximum hoop strain was −3562 με. It addressed the problem of high brittleness of frozen shaft lining structures of ordinary high-strength concrete and improved the toughness and crack resistance. HFRC is an ideal material for frozen shaft lining structures in deep and thick topsoil.
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spelling pubmed-69268482019-12-23 Hybrid-Fiber-Reinforced Concrete Used in Frozen Shaft Lining Structure in Coal Mines Yao, Zhishu Li, Xiang Wu, Taoli Yang, Long Liu, Xiaohu Materials (Basel) Article To address the cracking and leaking of concrete in frozen shaft linings in deep and thick topsoil layers in coal mines, hybrid-fiber-reinforced concrete (HFRC) was developed. First, the composition of the reference concrete was obtained by investigating high-strength concrete commonly used in shaft linings, and two dosages of polyvinyl alcohol fiber (PVAF) and polypropylene plastic steel fiber (PPSF) were obtained by the mixing test. Then, tests of early cracks of concrete were conducted; results showed that HFRC could almost avoid early cracks, exhibiting an advantage in early crack resistance. Thus, HFRC can play a significant role in improving the durability of frozen shaft linings in complex underground environments. Furthermore, a series of mechanical property tests were carried out. The results showed that the compressive strength of HFRC was similar to that of the reference concrete, but the tensile and flexural strength of HFRC was 42.7% and 35.1% higher than that of the reference concrete, respectively. Finally, an analog simulation model test of shaft linings was conducted. The new type of shaft lining structure containing hybrid fibers (HFs) exhibited plastic deformation characteristics under load, and the maximum hoop strain was −3562 με. It addressed the problem of high brittleness of frozen shaft lining structures of ordinary high-strength concrete and improved the toughness and crack resistance. HFRC is an ideal material for frozen shaft lining structures in deep and thick topsoil. MDPI 2019-12-02 /pmc/articles/PMC6926848/ /pubmed/31810158 http://dx.doi.org/10.3390/ma12233988 Text en © 2019 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Yao, Zhishu
Li, Xiang
Wu, Taoli
Yang, Long
Liu, Xiaohu
Hybrid-Fiber-Reinforced Concrete Used in Frozen Shaft Lining Structure in Coal Mines
title Hybrid-Fiber-Reinforced Concrete Used in Frozen Shaft Lining Structure in Coal Mines
title_full Hybrid-Fiber-Reinforced Concrete Used in Frozen Shaft Lining Structure in Coal Mines
title_fullStr Hybrid-Fiber-Reinforced Concrete Used in Frozen Shaft Lining Structure in Coal Mines
title_full_unstemmed Hybrid-Fiber-Reinforced Concrete Used in Frozen Shaft Lining Structure in Coal Mines
title_short Hybrid-Fiber-Reinforced Concrete Used in Frozen Shaft Lining Structure in Coal Mines
title_sort hybrid-fiber-reinforced concrete used in frozen shaft lining structure in coal mines
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6926848/
https://www.ncbi.nlm.nih.gov/pubmed/31810158
http://dx.doi.org/10.3390/ma12233988
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