Application of Blast Furnace Granulated Slag for Self-Healing Bio-Concretes

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Resumo

The properties of fine-grained concrete containing 20–80% granulated blast furnace slag and bacteria species Bacillus Subtilis have been studied. An assessment was made of changes in strength, self-healing of cracks using optical and electron microscopy and measuring the speed of ultrasound propagation perpendicular to the crack plane; composition and characteristics of the healing agent in cracks using X-ray analysis methods. Self-healing of cracks in concrete without bacteria occurred due to calcite deposition as a result of carbonation of portlandite during 50–65 cycles of humidification-drying, and in the presence of Bacillus Subtilis bacteria due to calcite deposition during their vital activity in 10–15 cycles. It is shown that the addition of granulated blast furnace slag slows down the crystallization of calcite, which forms a healing substance in the crack. It is assumed that the combined use of granulated blast furnace slag in dosages of 40–80% and Bacillus Subtilis bacteria in concrete structures operating under conditions of variable humidification can ensure the process of self-healing cracks and maintaining the strength of concrete in the long term due to simultaneous processes of strengthening the structure due to prolonged hydration of slag minerals and calcite deposition in cracks due to the vital activity of Bacillus Subtilis bacteria.

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Sobre autores

T. Chernykh

South Ural State University (National Research University)

Autor responsável pela correspondência
Email: chernykhtn@susu.ru

Doctor of Sciences 

Rússia, Chelyabinsk

K. Gorbachevskikh

South Ural State University (National Research University)

Email: kirill38964@gmail.com

Student

Rússia, Chelyabinsk

M. Komelkova

South Ural State University (National Research University)

Email: komelkovamv@susu.ru

Doctor of Sciences (Biology)

Rússia, Chelyabinsk

P. Platkovskiy

South Ural State University (National Research University)

Email: paw.platkovski@yandex.ru

Research Assistant 

Rússia, Chelyabinsk

M. Kriushin

South Ural State University (National Research University)

Email: kriushinmv@susu.ru

Engineer

Rússia, Chelyabinsk

A. Orlov

South Ural State University (National Research University)

Email: orlovaa@susu.ru

Candidate of Sciences (Engineering) 

Rússia, Chelyabinsk

Bibliografia

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2. Fig. 1. Sample with a rounded end and an embedded crack (arrows indicate the direction of ultrasonic radiation)

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3. Fig. 2. Compressive strength of beam samples depending on the number of wetting -drying cycles: a – without bacteria; b – with bacteria; 1 – 0%; 2 – 20%; 3 – 40%; 4 – 60%; 5 – 80%

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4. Fig. 3. History of crack healing using the example of tablet samples with a slag content of 80%: a – without bacteria; b – with bacteria

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5. Fig. 4. Dependence of the speed of ultrasound on the amount of slag: a – without bacteria; b – with bacteria; 1 – 0%; 2 – 20%; 3 – 40%; 4 – 60%; 5 – 80%

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6. Fig. 5. Equilibrium shape (a) and BFDH shape (b) of calcite crystallites [16]

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7. Fig. 6. Microphotographs of a healing agent in cracks of tablet samples 200: a – without adding slag; b – with the addition of slag 80%

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