Detection of the synergetic influence of chemical and microbiological factors on the properties of concrete constructions at chemical plants during the long-term service

Шкромада, Оксана; Pikhtirova, Alina; Chivanov, Vadym; Ivchenko, Viktoriia; Sribniak, Nataliia; Shvets, Olha; Litsman, Yuliia

doi:10.21303/2461-4262.2022.002485

Cited by 3 publications

(3 citation statements)

References 28 publications

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“…4). In [18,19], the effects of biological corrosion on concrete structures of a chemical enterprise are considered.…”

Section: Discussion Of Results Of Studying the Corrosion Changes And ...mentioning

confidence: 99%

Determining the characteristics of concrete in a historical building under the influence of climatic and biological factors

Shkromada,

Fotina,

Ivchenko

et al. 2024

EEJET

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The object of this study was concrete samples of the cathedral and wall frescoes. The study solved the problem related to the destruction of concrete and wall frescoes under the long-term influence of biochemical and climatic factors. Samples of concrete for research and wall murals were obtained from a historic listed building. Using microbiological studies and scanning electron microscopy, damage to wall murals and concrete by microscopic fungi was established: Aspergillus fumigatus, Penicillium brevicompactum, Aspergillus niger, Cladosporium sphaerospermum. The study of concrete samples by the TPD-MS method showed the presence of an increased level of moisture and carbon compounds by 20 % in the test samples, compared to control. The sulfur content in all concrete samples was not significant. Determination of the mineral composition of concrete by X-ray diffraction showed the presence of Al2O3, 36–44 %, which indicates a significant clay content. The presence of NiTi, 53 %, and СoMg7O8, 46 %, in the concrete sample indicates the probable migration of the chemical elements of the paint pigments used to decorate the cathedral. The concrete control sample contained a significant amount of SiO2, up to 51 %, which is the main component of sand. A feature of the work is the determination of the corrosion effect on concrete under prolonged exposure to climatic and biological factors. The present study is distinguished by the use of non-destructive methods: microbiological studies, scanning electron microscopy, TPD-MS and X-ray diffraction to determine the destruction of concrete and wall frescoes of the building, which is a cultural heritage. The results of the study could be applied to the development and planning of restoration works for the restoration of buildings that have historical value

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“…4). In [18,19], the effects of biological corrosion on concrete structures of a chemical enterprise are considered.…”

Section: Discussion Of Results Of Studying the Corrosion Changes And ...mentioning

confidence: 99%

Determining the characteristics of concrete in a historical building under the influence of climatic and biological factors

Shkromada,

Fotina,

Ivchenko

et al. 2024

EEJET

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“…Long-term operation of concrete structures in the workshop for the production of titanium dioxide by the sulfate method led to their corrosion by acid and sulfate mechanisms [14]. The result of acid corrosion is the conversion of insoluble alkaline components of concrete (lime and calcium carbonate) into more soluble sulfates or the formation of brittle precipitates of acid hydrates.…”

Section: Resultsmentioning

confidence: 99%

Scanning electron microscopy and X-ray microanalysis of the condition of concrete structures of a chemical enterprise with long-term corrosion in a sulfate environment

Шкромада

Shvets

2022

TT: PhE

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Long-term operation of premises in aggressive environments of chemical enterprises affects the surfaces of concrete structures and leads to the formation of destructive processes. The aim of the study was to determine changes in the structure and mineral composition of concrete during long-term operation in an aggressive sulfate environment at a chemical plant for the production of titanium dioxide using the sulfate method to predict the service life of concrete structures. It has been established that during the production of TiO2 pigment by the sulfate method, the ore is decomposed by sulfate acid at high temperature, accompanied by the release of H2SO4 vapor, sulfur dioxide SO2, hydrogen sulfide H2S and elemental sulfur. Studies have established that sulfate corrosion leads to the formation of sulfur and iron oxides on the concrete surface. Studies have revealed vast areas of the surface covered with crystals of elemental sulfur, the contents of which are confirmed by the results of X-ray microanalysis. The sizes of sulfur crystals in the image range from 12 to 180 µm, the shape corresponds to the rhombic allotropic modification S8. The penetration depth of iron sulfates into the thickness of concrete is about 50 microns. The microstructure of the surface is loose, with signs of corrosion. Exposure to a high concentration of sulphate acid vapors in the workshop of the enterprise led to the destruction of calcium carbonate and the formation of gypsum crystals in concrete. The formation of gypsum crystalline hydrates provokes sulfate corrosion of concrete, resulting in the formation of pores and microcracks in concrete with the formation of calcium hydrosulfoaluminate. The studies carried out using scanning electron microscopy and X-ray microanalysis make it possible to investigate the structural changes and mineral composition of concrete under the influence of long-term sulfate corrosion.

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“…3, a, b). Studies [18,19] proved the destructive prolonged effect of sulfate acid on concrete structures in chemical plants in the production of titanium dioxide by sulfate method.…”

Section: Discussion Of Results Of the Study Of Biochemical Corrosion ...mentioning

confidence: 99%

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

Шкромада

Ivchenko

Chivanov

et al. 2022

EEJET

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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.

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Detection of the synergetic influence of chemical and microbiological factors on the properties of concrete constructions at chemical plants during the long-term service

Cited by 3 publications

References 28 publications

Determining the characteristics of concrete in a historical building under the influence of climatic and biological factors

Determining the characteristics of concrete in a historical building under the influence of climatic and biological factors

Scanning electron microscopy and X-ray microanalysis of the condition of concrete structures of a chemical enterprise with long-term corrosion in a sulfate environment

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

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