Determining changes in the mineral composition of concrete due to chemical corrosion in a sulfate environment

Authors

DOI:

https://doi.org/10.15587/1729-4061.2022.268627

Keywords:

sulfate technology, X-ray diffraction, thermoprogrammed mass spectrometry, X-ray fluorescence analysis, electron microscopy

Abstract

The object of this study was the concrete structures of a chemical enterprise for the production of titanium dioxide. In this case, the ore is decomposed with sulfate acid according to the sulfate production technology. In an aggressive environment, chemical corrosion of concrete occurs, prolonged over time.

Using X-ray diffraction and X-ray fluorescence analysis methods, the mineral composition of two prototypes of concrete was determined. It was found that the sample obtained from the workshop for processing ore with sulfate acid showed an increased content of sulfur oxide (SO2) on the surface, by 33 %, with a reduced content of carbonates (CaCO3) on the surface, by 52.9 %, at a depth of 2 cm – by 53.65, compared to another (control) sample. At the same time, iron oxide (Fe2O3) was found on the surface in a sample of concrete from the ore storage room (control), the content of which decreased by 10.4 % at a depth of 2 cm, and by 12.4 % at a depth of 4 cm.

The results of electron microscopy show sulfur crystals on the surface of a concrete sample. It was also found that the microstructure of concrete was changed under the influence of sulfate corrosion, depending on the intensity of the exposure to a depth of 2 to 4 cm. By the method of thermoprogrammed mass spectrometry, it was established that when a sample of concrete exposed to sulfate acid is heated to a temperature of 400 °C, sulfur dioxide SO2 is released mainly from the surface. From the surface of the control sample, which contains a significant amount of CaCO3, which is easily destroyed by sulfate acid, there is probably a smaller amount of the product of thermal destruction of calcium carbonate carbon dioxide (CO2).

The results of the experiment can be used to study the mechanism of development of sulfate corrosion of concrete prolonged over time.

Author Biographies

Oksana Shkromada, Sumy National Agrarian University

Doctor of Veterinary Sciences, Professor

Department of Obstetrics and Surgery

Viktoriia Ivchenko, Sumy National Agrarian University

PhD, Associate Professor

Department of Therapy, Pharmacology, Clinical Diagnostics and Chemistry

Vadym Chivanov, Institute of Applied Physics, National Academy of Sciences of Ukraine

Doctor of Agrarian Sciences, Associate Professor

Depatrment of Radiation Biophysics

Olha Shvets, Sumy National Agrarian University

PhD, Associate Professor

Department of Therapy, Pharmacology, Clinical Diagnostics and Chemistry

Volodymir Moskalenko, Institute of Applied Physics, National Academy of Sciences of Ukraine

Chief Engineer of Complex Installation

Department of Nuclear-Physical Research

Alexander Kochenko, Institute of Applied Physics, National Academy of Sciences of Ukraine

Junior Reasearcher

Depatrment of Radiation Biophysics

Olena Babenko, Sumy State Pedagogical University named after A. S. Makarenko

PhD, Associate Professor

Department of Human Biology, Chemistry and Methodology of Teaching Chemistry

Yuliya Kharchenko, Sumy State Pedagogical University named after A. S. Makarenko

PhD, Associate Professor

Department of Human Biology, Chemistry and Methodology of Teaching Chemistry

Alina Pikhtirova, Sumy State University

PhD, Associate Professor

Department of Public Health

Oksana Yurchenko, Sumy National Agrarian University

PhD, Associate Professor

Department of Construction and Operation of Buildings, Roads and Road Constructions

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Determining changes in the mineral composition of concrete due to chemical corrosion in a sulfate environment

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Published

2022-12-31

How to Cite

Shkromada, O., Ivchenko, V., Chivanov, V., Shvets, O., Moskalenko, V., Kochenko, A., Babenko, O., Kharchenko, Y., Pikhtirova, A., & Yurchenko, O. (2022). Determining changes in the mineral composition of concrete due to chemical corrosion in a sulfate environment. Eastern-European Journal of Enterprise Technologies, 6(6 (120), 42–50. https://doi.org/10.15587/1729-4061.2022.268627

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Technology organic and inorganic substances