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Open AccessArticle

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

School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China
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Materials 2019, 12(23), 3988; https://doi.org/10.3390/ma12233988
Received: 14 November 2019 / Revised: 26 November 2019 / Accepted: 27 November 2019 / Published: 2 December 2019
(This article belongs to the Special Issue Advanced Fiber-Reinforced Concrete Composites)
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. View Full-Text
Keywords: hybrid fiber; reinforced concrete; shaft lining structure; mechanical property; crack resistance hybrid fiber; reinforced concrete; shaft lining structure; mechanical property; crack resistance
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Yao, Z.; Li, X.; Wu, T.; Yang, L.; Liu, X. Hybrid-Fiber-Reinforced Concrete Used in Frozen Shaft Lining Structure in Coal Mines. Materials 2019, 12, 3988.

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