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https://repository.sspu.edu.ua/handle/123456789/324

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Перегляд Статті за Автор "Ivchenko Viktoriia"

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  • Документ
    Determining Changes in the Mineral Composition of Concrete Due to Chemical Corrosion in a Sulfate Environment
    (Eastern-European Journal of Enterprise Technologies, 2022) Shkromada Oksana; Шкромада Оксана; Ivchenko Viktoriia; Івченко Вікторія; Chivanov Vadym; Чіванов Вадим; Shvets Olha; Швец Ольга; Kochenko Oleksandr; Коченко Олександр; Moskalenko Volodymyr; Москаленко Володимир; Babenko Olena Mykhailivna; Бабенко Олена Михайлівна; Kharchenko Yuliia Volodymyrivna; Харченко Юлія Володимирівна; Pikhtirova Alina; Піхтірова Аліна; Yurchenko Oksana; Юрченко Оксана
    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 rocessing ore with sulfate acid showed an increased content of sulfur oxide (SO2) on the surface, by 33 %, ith a reduced content of carbonates (CaCO3) on the surface, by 52.9 %, at a depth of 2 cm – by 53.65, ompared to another (control) sample. At the same time, iron oxide (Fe2O3) was found on the surface in a ample 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 hat the microstructure of concrete was changed under the influence of sulfate corrosion, depending on the ntensity of the exposure to a depth of 2 to 4 cm. By the method of thermoprogrammed mass spectrometry, it as established that when a sample of concrete exposed to sulfate acid is heated to a temperature of 400 °C, ulfur dioxide SO2 is released mainly from the surface. From the surface of the control sample, which contains significant amount of CaCO3, which is easily destroyed by sulfate acid, there is probably a smaller amount of he 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.
  • Документ
    Determining the Characteristics of Concrete in a Historical Building Under the Influence of Climatic and Biological Factors
    (2024) Shkromada Oksana; Шкромада Оксана; Fotina Tatiana; Фотіна Тетяна; Ivchenko Viktoriia; ‪Івченко Вікторія; Chivanov Vadym; Чіванов Вадим; Sirobaba Vitaliy; Сіробаба Віталій; Shvets Olha; Pikhtirova Alina; Піхтірьова Аліна; Babenko Olena Mykhailivna; Бабенко Олена Михайлівна; Vorobiova Inna; Воробйова Інна; Dychenko Tetiana; Диченко Тетяна
    The object of this study was con-crete 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 scan-ning electron microscopy, dam-age 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 signifi-cant. 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 pres-ence of NiTi, 53 %, and СoMg7O8, 46 %, in the concrete sample indi-cates the probable migration of the chemical elements of the paint pig-ments used to decorate the cathe-dral. 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 cor-rosion effect on concrete under pro-longed exposure to climatic and bio-logical factors. The present study is distinguished by the use of non-de-structive methods: microbiological studies, scanning electron micros-copy, TPD-MS and X-ray diffrac-tion to determine the destruction of concrete and wall frescoes of the building, which is a cultural heri-tage. 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.