THE STRUCTURE AND PROPERTIES FEATURES OF CONCRETE DURING EXPLOITATION UNDER CONDITIONS OF ORGANIC OIL INFLUENCE

Authors

DOI:

https://doi.org/10.15421/jchemtech.v33i2.322601

Keywords:

vegetable oil, biochemical concrete corrosion, , thermal properties, microscopic structure

Abstract

The relevance of the study is to determine the impact of vegetable oil on concrete structures in the case of its long-term action. Currently, the buildings of the agro-industrial complex, built in the 70s and 80s of the 20th century, are used to process sunflower seeds into oil. Aim. To determine the effect of vegetable oil on the physicochemical characteristics of concrete. Methods. The strength of concrete samples was determined by destructive testing depending on the depth of oil penetration; structural changes in concrete were determined by scanning electron microscopy; thermal analysis of concrete samples was performed by thermo-programmed mass spectrometry. Results. It was found that sample 1 was 17 % oiled, with a strength loss of 6 %. Concrete sample 2, with 56 % oiled, lost 19 % of its strength. Sample 3, with 100 % oiled, lost 48 % of its strength. The destruction of the concrete structure was established by electron microscopy. Spores and hyphae of microscopic fungi were detected at a depth of 2 cm from the surface. The study of concrete samples using TPD MS showed that carbon monoxide was intensively released at a temperature of 583 °C from samples 2–0.03 and 3–0.05. CO2 was released at a temperature of 552 °C with an intensity of 0.1 from sample 2 and 0.18 from sample 3. Carbon was not released from the other samples, which is related to the biochemical corrosion of concrete. Water was released from concrete samples 2–0.8 and 3–0.4 at 100 °C. Conclusions. Correlations have been established between the depth of concrete oil impregnation and the loss of strength due to the weakening of contacts between cement stone and aggregate (crushed stone). The scientific novelty of the results obtained lies in determining the long-term impact of organic oil on the physicochemical characteristics of concrete.

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Published

2025-07-15