Fine-grained and high-impact fiber-reinforced concrete for application in underground mines in permafrost zone

These studies focus on influence of polypropylene and basalt fibers 10–23 µm in diameter on physical and mechanical properties of fine-grained concrete. The influence patterns of cyclic freeze–thaw (freezing temperature minus 50±2°С, State Standard GOST 10060-2012) on the bending and compression strength, as well as on the required fracture energy of fiber-reinforced concrete are presented. The optimal content of fiber grades VSM-6 and VS23-6-61 in fined-grained concrete is determined. It is found that addition of basalt fibers in fined-grained concrete increases its cold endurance, since at the fiber content of 2 %, the test samples reach properties of concrete grade F200. The fiber-reinforced concrete samples possess higher statistic loading resistance after cyclic freeze–thaw. The patterns of change in the impact resistance of fiber-reinforced concrete in loading by vertical and pendulum hammering after cyclic freeze–thaw are given. The introduction of polypropylene fiber grade VSM-6 in concrete essentially enhances its fracture toughness (dynamic bending resistance). For instance, after 12 cycles, the required energy of fracture of the concrete samples with fiber contents of 1 and 2 % exceeds the standard fracture energy by 1.9–2.1 times. In vertical hammering tests, the energy required to fracture concrete reinforced with fiber grade VS23-6-61 is increased by 1.7–1.8 times and remains unaltered after 5 cycles. The test results prove that reinforcement of fine-grained concrete with short basalt and polypropylene fibers can improve mining safety and expand application range of concrete structures in underground mines in the permafrost zone and in the Far North.

Keywords: fiber, basalt fiber, polypropylene fiber, fine-grained concrete, fiber-reinforced concrete, bending and compression strength limits, required fracture energy, cyclic freeze– thaw.
For citation:

Alekseev K. N., Kurilko A. S. Fine-grained and high-impact fiber-reinforced concrete for application in underground mines in permafrost zone. MIAB. Mining Inf. Anal. Bull. 2021;(12—1):15—28. [In Russ]. DOI: 10.25018/0236_1493_2021_121_0_15.

Acknowledgements:
Issue number: 12
Year: 2021
Page number: 15-28
ISBN: 0236-1493
UDK: 691.322.7
DOI: 10.25018/0236_1493_2021_121_0_15
Article receipt date: 18.07.2021
Date of review receipt: 29.10.2021
Date of the editorial board′s decision on the article′s publishing: 10.11.2021
About authors:

Alekseev K. N.1, Junior Researcher, const1711@mail.ru;
Kurilko A. S.1, Dr. Sci. (Eng.), Professor, Head of mountain thermal physics laboratory;
1 Institute of Mining of the North named after N.V. Chersky (Siberian Branch of Russian Academy of Sciences), Republic of Sakha (Yakutia), Yakutsk, Lenina ave., 43, 677980, Russia.

 

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