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Название Resistance of fine-grained basalt fiber concrete to static and dynamic loads after exposure to freeze-thaw cycles
DOI 10.17580/gzh.2019.02.14
Автор Alekseev K. N., Kurilko A. S., Tatarinov P. S., Lvov A. S.
Информация об авторе

Chersky Institute of Mining of the North, Siberian Branch, Russian Academy of Sciences, Yakutsk, Russia:

K. N. Alekseev, Junior Researcher
A. S. Kurilko, Deputy Director, Doctor of Engineering Sciences, a.s.kurilko@igds.ysn.ru


Mirny Polytechnic Institute (Branch), Ammosov North-Eastern Federal University, Mirny, Russia:
P. S. Tatarinov, Senior Lecturer
A. S. Lvov, Senior Lecturer


The article presents the results of studies aimed to determine the effect of basalt fiber (length 6 mm, diameter 23 μm) on flexural and compressive strength, as well as the specific energy intensity of concrete destruction based on cement–sand matrix. In addition, the article describes the change in the data on physicomechanical characteristics after different numbers of freeze–thaw cycles. It is established that samples of fibro-reinforced series have a higher resistance to bending loads, including after exposure to alternating temperatures. The impact of 5 freeze–thaw cycles (freezing temperature minus 50 ± 5 °C, GOST 10060.2–95) resulted in a decrease in flexural strength of control (non-reinforced) series samples by 73% of the original, while the strength of samples containing fiber was 2 and 4% decreased by 40 and 35%, respectively. When tested in compression, the impact of 5 cycles led to a decrease in the strength of the control unreinforced series of samples ≈ 2 times. While the impact of 5 cycles on samples containing fiber in the amount of 2% led to a decrease in their strength by 5% from the control (unreinforced) series, which, in accordance with GOST 10060.0–95, corresponds to the frost resistance grade F200. In determining the resistance of fine-grained concrete to dynamic effects, it was found that the specific energy consumption of the destruction of samples of fibro-reinforced series exceeds the control one by 1.7–1.8 times. The greatest increase in the energy intensity of destruction by 79 % is observed when the fiber content is 2 %. The effect of 5 freeze-thaw cycles resulted in a 58 % reduction in the specific energy intensity of failure of unreinforced series samples. At the same time, the energy intensity of the destruction of samples of fiber-reinforced series with a fiber content of 2 and 4 % still exceeds the control (fiber 0 %, 0 cycles) by 19 and 60 %, respectively. The impact of 12 cycles resulted in a 76% decrease in the energy intensity of the destruction of the samples of the control (unreinforced) series. Fiber-reinforced samples have a higher resistance to shock loads, for samples with a fiber content of 4 %, the reduction was 10 % of the control. The results obtained indicate that dispersed reinforcement of fine-grained concrete with basalt fiber can increase its strength, resistance to impact loads, as well as frost resistance, thereby expanding the scope of its application.

Ключевые слова Fiber-concrete, basalt fiber, composite material, specific energy intensity of destruction, flexural and compressive strength, freeze-thaw cycles, frost resistance, permafrost zone
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