E3S Web Conf.
Volume 274, 20212nd International Scientific Conference on Socio-Technical Construction and Civil Engineering (STCCE – 2021)
|Number of page(s)||8|
|Section||Building Materials and Products|
|Published online||18 June 2021|
Forecasting the durability of reinforced concrete under conditions of microbiological corrosion
1 Sakhalin State University, 693000 Yuzhno-Sakhalinsk, Russia
2 Ivanovo State Polytechnic University, 153000 Ivanovo, Russia
* Corresponding author: email@example.com
The article presents data on the study of the kinetics of liquid corrosion of cement concrete infected with microorganisms Bacillus subtilis and Aspergillus niger. The equilibrium concentrations of calcium cations during fungal and bacterial corrosion of cement concrete in an aqueous medium are established. According to the profiles of calcium hydroxide concentrations in the thickness of cement concrete during fungal and bacterial corrosion, it was found that during fungal corrosion of concrete, the intensity of interaction of calcium hydroxide with the products of the vital activity of microorganisms is higher than during bacterial corrosion. In case of fungal corrosion under conditions of Aspergillus niger infection, citric acid has the greatest impact on concrete since its amount in the products of the vital activity of microorganisms is maximum. Profiles of concentrations of aggressive substances by the thickness of the concrete sample show that bacterial corrosion proceeds more slowly than fungal corrosion and allow us to calculate the time to reach the maximum concentration of aggressive substances at the surface of steel reinforcement in concrete. Corrosion of reinforcement in concrete with fungal corrosion will begin in 2.5 years after infection, with bacterial corrosion after 5.5 years.
Key words: Liquid corrosion / concrete corrosion / microbially induced / corrosion / fungal corrosion / bacterial corrosion / durability of reinforced concrete
© The Authors, published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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