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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 2cm – 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 2cm, and by 12.4% at a depth of 4cm. 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 4cm. 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 SO2is 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.

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., Об’єктом дослідження були бетонні конструкції хімічного підприємства з виробництва двоокису титану. При цьому руду за сульфатною технологією виробництва розкладають сульфатною кислотою. В умовах агресивного середовища виникає хімічна корозія бетону, пролонгована з часом. За допомогою методів рентгенівської дифракції та рентгенофлуоресцентного аналізу визначений мінеральний склад двох дослідних зразків бетону. Встановлено, що у зразку отриманого з цеху для обробки руди сульфатною кислотою, збільшений вміст оксиду сірки (SO2) на поверхні на 33%, при цьому зменшується вміст карбонатів (CaСO3) на поверхні на 52,9%, на глибині 2см – на 53,6 5, порівняно до іншого (контрольного) зразку. При цьому у зразку бетону з приміщення для зберігання руди (контроль) виявляли оксид заліза (Fe2O3) на поверхні, вміст якого зменшувався на 10,4% на глибині 2см та на 12,4% на глибині 4см. Результати використання електронної мікроскопії показують кристали сірки на поверхні зразка бетону. Також встановлено, що мікроструктура бетону змінена під впливом сульфатної корозії залежності від інтенсивності ураження на глибину від 2 до 4см. Методом термопрограмованої масспектрометрії встановлено, що при нагріванні зразку бетону, підданого дії сульфатної кислоти до температури 400°С з поверхні виділяється переважно діоксид сірки SO2. З поверхні контрольного зразка, який містить значну кількість CаCO3, який легко руйнується сульфатною кислотою, вірогідно менша кількість продукту термодеструкції карбонату кальцію діоксиду вуглецю (СО2). Результати проведеного експерименту можна застосовувати для вивчення механізму розвитку сульфатної корозії бетону пролонговану з часом

The object of this study is the regularity of changes in the biogenic destructive effect of microorganisms on the concrete structural elements of livestock facilities due to the use of the original liquid phase mixture of disinfectant based on aldehyde and surfactant. Microorganisms use construction materials as a substrate for growth and nutrition; they produce citric acid, which leads to a change in the composition and morphology of hydrated cement new formations. The composition of the microflora of the pigsty has been determined, and the minimum concentration of disinfectant based on glutaraldehyde and didecyl dimethyl ammonium chloride was found. By the TPD MS method, a decrease in the intensity of carbon dioxide (CO2) release in concrete samples during the heating of the sample to 900 °C was proved, compared to the control intact corrosion sample. Electron microscopy of concrete samples shows the presence of destructive changes and colonies of micromycetes. It was established that calcite was intensively released in the control sample of concrete, which retained its integrity and was not subjected to corrosion when heated to a temperature of 600 °C. Electron microscopy confirms the preservation of the homogeneous structure of concrete. The use of a disinfectant based on glutaraldehyde and didecyl dimethyl ammonium chloride at a concentration of 1 % destroys colonies of micromycetes, 2 % – the shell of microorganisms, and 3 % – biofilm. Treatment of concrete with a disinfectant at a concentration of 3 % destroys microorganisms Aspergillus fumigatus and Penicillium oxalicum, inhibits the process of biological corrosion of concrete, and strengthens the structure of concrete. The results of the experiment can be applied to inhibit the corrosion of concrete and extend the life of building structures made of concrete through the use of a disinfectant based on aldehyde and didecyl dimethyl ammonium chloride at a concentration of 3 %., Об’єктом дослідження є закономірність зміни біогенного руйнівного впливу мікроорганізмів на бетонні конструктивні елементи тваринницьких приміщень за рахунок використання оригінальної рідкофазової суміші дезінфектанту на основі альдегіду та поверхнево-активної речовини. Мікроорганізми використовують будівельні матеріали як субстрат для росту та харчування, а також виробляють лимонну кислоту, яка призводять до зміни складу та морфології гідратних новоутворень цементу. Встановлений склад мікрофлори свинарника, та визначена мінімальна 1% концентрація дезінфектанту на основі глютарового альдегіду та дидецилдиметиламонію хлориду. Методом TPD MS доведено зменшення інтенсивності виділення двоокису вуглецю (СО2) у зразках бетону під час нагрівання зразку до 900°С, порівняно до контрольного неушкодженого корозією зразка. Електронна мікроскопія зразків бетону показує наявність деструктивних змін та колоній мікроміцетів. Встановлено, що у контрольному зразку бетону, який зберіг цілісність та не підданий корозії при нагріванні до температури 600°С інтенсивно вивільнялись кальцити. Електронна мікроскопія підтверджує збереження однорідної структури бетону. Використання дезінфектанту на основі глютарового альдегіду та дидецилдиметиламонію хлориду у концентрації 1% руйнує колонії мікроміцетів; у 2% – оболонку мікроорганізмів та у 3% – біоплівку. Обробка бетону дезінфектантом у концентрації 3% знищує мікроорганізми Aspergillus fumigatus та Penicillium oxalicum, гальмує процес біологічної корозії бетону та зміцнює структуру бетону. Результати проведеного експерименту можна приміняти для гальмування корозії бетону та подовження терміну експлуатації будівельних конструкцій виконаних з бетону за рахунок використання дезінфектанту на основі альдегіду та дидецилдиметиламонію хлориду у концентрації 3%

The object of this study is the regularity of changes in the biogenic destructive effect of microorganisms on the concrete structural elements of livestock facilities due to the use of the original liquid phase mixture of disinfectant based on aldehyde and surfactant. Microorganisms use construction materials as a substrate for growth and nutrition; they produce citric acid, which leads to a change in the composition and morphology of hydrated cement new formations. The composition of the microflora of the pigsty has been determined, and the minimum concentration of disinfectant based on glutaraldehyde and didecyl dimethyl ammonium chloride was found. By the TPD MS method, a decrease in the intensity of carbon dioxide (CO2) release in concrete samples during the heating of the sample to 900°C was proved, compared to the control intact corrosion sample. Electron microscopy of concrete samples shows the presence of destructive changes and colonies of micromycetes. It was established that calcite was intensively released in the control sample of concrete, which retained its integrity and was not subjected to corrosion when heated to a temperature of 600°C. Electron microscopy confirms the preservation of the homogeneous structure of concrete. The use of a disinfectant based on glutaraldehyde and didecyl dimethyl ammonium chloride at a concentration of 1% destroys colonies of micromycetes, 2% – the shell of microorganisms, and 3% – biofilm. Treatment of concrete with a disinfectant at a concentration of 3% destroys microorganisms Aspergillus fumigatus and Penicillium oxalicum, inhibits the process of biological corrosion of concrete, and strengthens the structure of concrete. The results of the experiment can be applied to inhibit the corrosion of concrete and extend the life of building structures made of concrete through the use of a disinfectant based on aldehyde and didecyl dimethyl ammonium chloride at a concentration of 3%.

The object of this study is the regularity of changes in the biogenic destructive effect of microorganisms on the concrete structural elements of livestock facilities due to the use of the original liquid phase mixture of disinfectant based on aldehyde and surfactant.Microorganisms use construction materials as a substrate for growth and nutrition; they produce citric acid, which leads to a change in the composition and morphology of hydrated cement new formations.The composition of the microflora of the pigsty has been determined, and the minimum concentration of disinfectant based on glutaraldehyde and didecyl dimethyl ammonium chloride was found. By the TPD MS method, a decrease in the intensity of carbon dioxide (CO2) release in concrete samples during the heating of the sample to 900 °C was proved, compared to the control intact corrosion sample. Electron microscopy of concrete samples shows the presence of destructive changes and colonies of micromycetes. It was established that calcite was intensively released in the control sample of concrete, which retained its integrity and was not subjected to corrosion when heated to a temperature of 600 °C. Electron microscopy confirms the preservation of the homogeneous structure of concrete.The use of a disinfectant based on glutaraldehyde and didecyl dimethyl ammonium chloride at a concentration of 1 % destroys colonies of micromycetes, 2 % – the shell of microorganisms, and 3 % – biofilm. Treatment of concrete with a disinfectant at a concentration of 3 % destroys microorganisms Aspergillus fumigatus and Penicillium oxalicum, inhibits the process of biological corrosion of concrete, and strengthens the structure of concrete. The results of the experiment can be applied to inhibit the corrosion of concrete and extend the life of building structures made of concrete through the use of a disinfectant based on aldehyde and didecyl dimethyl ammonium chloride at a concentration of 3 %.