Results analysis of building structure inspection operated in corrosion environment

Abstract

Examination of the reinforced concrete structures state under the influence of organic corrosion environments showed a direct dependence of the nature of the platelet structure of concrete on the polyhydric alcohols adsorption activity of low concentrations. The author has proved the connection between the concrete organic corrosion and its destruction by organic substances, including polyhydric alcohols, aggressive towards cement stone and concrete, especially under the combined action of climatic factors — moistening and drying, freezing and thawing; in these cases, there is an accumulation of internal defects in the concrete in the form of microcracks, which lead to a decrease in its operational properties and further destruction of structures. Field studies conducted by the author included the study of the nature, causes and sources of aggressive secretions, which were monitored, the intensity of the secretions, the limits of distribution and the places of their accumulation were determined. Samples from the damaged areas were taken to clarify the damage nature and degree in the laboratory using physical, mechanical and chemical research methods. According to the inspections results, intensive destruction of the foundation sections under the tanks of finished products, elevated road’s reinforced concrete columns under the alcohol supply pipelines, and floors on acid-resistant tiles were detected. The reasons for the penetration of aggressive solutions through leaks and broken coatings of structures are shown. The inspection also made it possible to identify the causes of aggressive emissions: leakage, insufficient sealing of containers, spills during equipment operation, and others. The author has shown the negative impact of the simultaneous exposure to corrosion environment and low temperatures, and also found that with an increase in the content of mineral additives in the binder, the adsorption of polyhydric alcohols on the cement stone decreases. The high degree of the concrete pore space filling with solutions of polyhydric alcohols is also the main reason for their rapid destruction during frost exposure. Recommendations are given to improve the durability of structures by introducing hydraulic additives into the composition of the binder.