EFFECT OF CYCLIC FREEZE AND THAW ON IMPACT RESISTANCE OF FINE-GRAINED CONCRETE DEPENDING ON BASALT FIBER CONTENT

The article presents the results of the investigations aimed to relate variation in energy consumption of fined-grained concrete destruction, content of basalt fiber and cyclic freeze–thaw effect.

The energy consumption of fine-grained concrete destruction was determined using the vertical impact testing machine by Syskov, the reinforcement of concrete was basalt fibers with a diameter of 23 μm and 6 mm long. Concrete samples saturated with sodium chlorite solution were subjected to cyclic freeze and thaw by the third rapid method (freezing temperature 50±5°С) as per state standards GOST 10060.0-95 and 10060.2-95. It is found that dispersed reinforcement of fine-grained concrete with basalt fibers increases energy consumption of concrete destruction up to 1.8–1.9 times. The fiber-reinforced concrete samples are capable to resist impact loading after effect of alternating temperature. After 5 freeze and thaw cycles, reduction in the energy consumption of nonreinforced concrete destruction reaches 58% of initial value. The energy consumption of destruction of reinforced concrete samples with the basalt fiber content of 2 and 4% after 5 freeze and thaw cycles exceeds the energy consumption of destruction of nonreinforced concrete samples by 1.2 ad 1.6 times, respectively. The revealed relations can be used in development of concrete compositions and structures to be higher resistant with respect to impact loading and alternating temperature effect. The sphere of application of such concrete is various-purpose construction in mines in the North and permafrost region.

Keywords

Basalt fiber, fine-grained concrete, composite, energy consumption of destruction, vertical impact testing machine, freeze and thaw cycles, permafrost region.

Issue number: 12
Year: 2018
ISBN:
UDK: 691.322.7
DOI: 10.25018/0236-1493-2018-12-0-84-91
Authors: Alekseev K. N.

About authors: Alekseev K.N., Junior Researcher, e-mail: const1711@mail.ru, Chersky Mining Institute of the North, Siberian Branch, Russian Academy of Sciences, 677018, Yakutsk, Republic of Sakha (Yakutia), Russia.

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