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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...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2019
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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. |
format | Online Article Text |
id | pubmed-6926848 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
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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