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First name, Middle name, Last name, Scientific degree, Scientific rank, Current position. Full and brief name of the organization, The organization address.Oleg V. Khokhryakov, doctor of technical sciences, associate professor, Kazan State University of Architecture and Engineering, Kazan, Russian Federation. Email: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Evgeny G. Gulyakov, post-graduate student, engineer, Kazan State University of Architecture and Engineering, Kazan, Russian Federation. Email: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Vadim G. Khozin, doctor of technical sciences, professor, Kazan State University of Architecture and Engineering, Kazan, Russian Federation. Email: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Andrey Yu. Belyakov, post-graduate student, head of laboratory, Kazan State University of Architecture and Engineering, Kazan, Russian Federation. Email: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Title of the articleProblems of efflorescence in concrete vibro-pressed paving slabs
Abstract.Currently, concrete products for sidewalk coverings are actively used in landscaping. They are distinguished by their expressiveness, ease of production and installation, different colors, as well as a wide range. Throughout the entire period of operation, the products are under the influence of many types of influences, which include precipitation, solar radiation, drying, alternating freezing and thawing, mechanical wear, de-icing reagents, etc. Most often, defects appear on the front surface in the form of efflorescence and efflorescence, although their presence does not affect the physical and mechanical properties, but reduces the aesthetic quality. The purpose of this study is to analyze modern data and conduct physical and chemical tests of concrete paving slabs to identify the causes of efflorescence and changes in their color. To achieve this goal, the following tasks were identified: 1. Perform an analysis of literature data on the causes of efflorescence on cement concrete products. 2. Determine the color change of concrete slabs; 3. Conduct comparative microscopic studies of the surface of concrete slabs; 4. Study the pH environment of the aqueous solution in which the concrete samples were located; 5. Conduct a qualitative assessment of efflorescence; 6. Determine the content of chlorine ions in concrete slabs. Results. As a result of the research, the main factors causing efflorescence and discoloration of paving slabs were identified. When comparing the appearance of reference products with samples taken from the site, an increased difference in the color of their surface was revealed between them. The main cause of efflorescence has been determined - leaching of hydrated lime, which is also supplemented by the migration of active substances to the surface when moisture acts on the products due to their increased porosity. Based on the results of the study, recommendations were developed for adjusting the production technology of paving slabs. Conclusions. The value of the results lies in identifying the factors leading to efflorescence and discoloration of concrete slabs, and in justifying ways to eliminate them.
Keywords.concrete, efflorescence, fine-grained cement concrete, slabs for sidewalks, vibropressed slabs
For citations:Khokhryakov O.V., Gulyakov E.G., Khozin V.G., Belyakov A.Yu. Problems of efflorescence in concrete vibro-pressed paving slabs // News KSUAE, 2023, № 3(65), p. 86-100, DOI: 10.52409/20731523_2023_3_86, EDN: FUMXDN


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