Русский
English
The article is devoted to the effect of internal hydrophobization of concrete cement stone on the kinetics of damage by Aspergillus niger fungi. The studies were carried out on samples made of ordinary Portland cement with a W/C = 0,3. As a hydrophobic agent, 0,5 and 1% by weight of cement of calcium stearate were introduced into the cement mixture. The kinetics of calcium leaching from cement stone was evaluated by changes in the calcium content in the liquid when samples were exposed to water. Internal hydrophobization of cement stone with calcium stearate makes it possible to reduce the removal of calcium from the solid phase by 2,5-3 times, even with biofouling of the surface. The equilibrium state in the «cement stone – water» system occurs 70 days after the samples are immersed in a liquid medium. The profiles of calcium concentrations along the thickness of the cement stone characterize a decrease in mass transfer in samples with hydrophobic additives. The introduction of calcium stearate into the cement mixture increases the total calcium content in the structure and reduces calcium leaching as a result of liquid and fungal corrosion. Volumetric hydrophobization of cement stone leads to a decrease in the values of mass conductivity coefficients by two orders of magnitude, from 10-9 to 10-11 m2/s. Using a mathematical model of concrete biocorrosion, the degree of destruction under the influence of fungal microorganisms and water is predicted after 15 years. During this period, corrosion processes will occur in ordinary concrete throughout its entire thickness, in hydrophobic concrete – only in the surface layer. With calcium stearate additives to concrete, it is possible to extend the maintenance-free service life under conditions of exposure to fungi and moisture for up to 30 years.
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29. Krasilnikov I.V., Rumyantseva V.E., Krasilnikova I.A. Selection of the Optimal Composition of Shotcrete According to the Criteria of Durability. Lecture Notes in Civil Engineering. 2025 576 LNCE, P. 309 – 319.
30. Rumyantseva V.E., Krasilnikov I.V., Galtsev A.A., Strokin K.B., Krasilnikova I.A. Industrial safety management during the life cycle of textile industry construction facilities under the influence of fungal microorganisms. Izvestiya Vysshikh Uchebnykh Zavedenii Seriya Teknologiya Tekstil Noi Promyshlennosti. 2025. 1 (415). P. 245 – 257.
2. Bryukhanov A.L., Vlasov D.Y., Maiorova M.A., Tsarovtseva I.M. The Role of Microorganisms in the Destruction of Concrete and Reinforced Concrete Structures. Power Technology & Engineering. 2021. 54. P. 609 – 614.
3. Rozental N.K., Chekhnii G.V. Protection of reinforced concrete structures in biologically aggressive environments. Bulletin of Science and Research Center of Construction. 2024. 42 (3). P. 47 – 55.
4. Rumyantseva V.E., Krasilnikov I.V.,Krasilnikova I.A., Novikovа U.A., Strokin K.B. Changing the bearing capacity of building structures of textile and light industry enterprises. Izvestiya Vysshikh Uchebnykh Zavedenii Seriya Teknologiya Tekstil Noi Promyshlennosti. 2023. 2(404). P. 218 – 227.
5. Yakovleva G., Sagadeev E., Stroganov V., Kozlova O., Okunev R., Ilinskaya O. Metabolic Activity of Micromycetes Affecting Urban Concrete Constructions. The Scientific World Journal. 2018. 2018. P. 8360287.
6. Dubey R.S., Yaman S. Microbiologically influenced corrosion of concrete: a review. International Journal of Current Research. 2019. 11 (06). P. 4282 – 4287.
7. Erofeev V.T., Al-Dulaimi Salman Davud Salman, Fedortsov A.P., Bogatov A.D., Fedortsov V.A. Biological corrosion of concrete. Stroitel’nye Materialy [Construction Materials]. 2020. 11. P. 13 – 23.
8. Chizhik K.I., Belookaya N.V. Model of microbiological corrosion of concrete in the systems of canalization. Izvestiya vuzov. Investitsii. Stroitel'stvo. Nedvizhimost' [Proceedings of Universities. Investments. Construction. Real estate]. 2017. 7 (2). P. 75 – 83.
9. Bertron A. Understanding interactions between cementitious materials and microorganisms: a key to sustainable and safe concrete structures in various contexts. Materials and Structures. 2014. 47. P. 1787 – 1806.
10. Wang D., Guan F., Feng C., Mathivanan K., Zhang R., Sand W. Review on Microbially Influenced Concrete Corrosion. Microorganisms. 2023. 11 (8). P. 2076.
11. Strokin K.B., Novikov D.G., Konovalova V.S. Determination of the degree of microbiological damage to the «Cement Concrete – Steel Reinforcement» system. Journal of Physics: Conference Series. 2022. 2373. P. 022032.
12. O’Connell M., McNally C., Richardson M.G. Biochemical attack on concrete in wastewater applications: A state of the art review. Cement and Concrete Composites. 2010. 32 (7). P. 479 – 485.
13. Fic S., Barnat-Hunek D. The Effectiveness of Hydrophobisation of Porous Building Materials by Using the Polymers and Nanopolymers Solutions. International Journal of Materials Science and Engineering. 2014. 2 (2). P. 93 – 98.
14. Haji Hossein A., Bigdeli H., Mokhtari F., Jahantab S., Habibnejad korayem A. The Effect of Hydrophobic Amorphous Carbon Powder on the Compressive Strength, Water Absorption and Rheological Attributes of Cement Mortar. Civil Engineering Infrastructures Journal. 2022. 55 (1). P. 109 – 120.
15. Pernicova R. Influence of hydrophobic additives on protection against alkali environment. WSEAS TRANSACTIONS on HEAT and MASS TRANSFER. 2016. 11. P. 8 – 12.
16. Materak K., Wieczorek A., Łukowski P., Koniorczyk M. The influence of internal hydrophobization using organosilicon admixture on the performance and the durability of concrete. Cement Wapno Beton. 2023. XXVIII (4). P. 225 – 237.
17. Zhang Ch., Zhang S., Yu J., Kong X. Water absorption behavior of hydrophobized concrete using silane emulsion as admixture. Cement and Concrete Research. 2022. 154. P. 106738.
18. Chen R., Liu J., Mu S. Chloride ion penetration resistance and microstructural modification of concrete with the addition of calcium stearate. Construction and Building Materials. 2022. 321. P. 126188.
19. Lanzón M., García-Ruiz P.A. Evaluation of capillary water absorption in rendering mortars made with powdered waterproofing additives. Construction and Building Materials. 2009. 23. P. 3287 – 3291.
20. Feng Z., Wang F., Xie T., Ou J., Xue M., Li W. Integral hydrophobic concrete without using silane. Construction and Building Materials. 2019. 227. P. 116678.
21. Nemati Chari M., Naseroleslami R., Shekarchi M. The impact of calcium stearate on characteristics of concrete. Asian Journal of Civil Engineering. 2019. 20. P. 1007 – 1020 (2019).
22. Park J.-H., Yoon C.-B. Properties and Durability of Cement Mortar Using Calcium Stearate and Natural Pozzolan for Concrete Surface Treatment. Materials. 2022. 15 (16). P. 5762.
23. Fedosov S.V., Krasilnikov I.V., Rumyantseva V.E., Krasilnikova I.A. Research of the Engagement of Liquid Aggressive Environment and Concrete. Lecture Notes in Networks and Systems. 2022. 403 LNNS, P. 1362 – 1370.
24. Maryoto A., Setijadi R., Widyaningrum A., Waluyo S. Drying Shrinkage of Concrete Containing Calcium Stearate, (Ca(C18H35O2)2), with Ordinary Portland Cement (OPC) as a Binder: Experimental and Modelling Studies. Molecules. 2020. 25 (21). P. 4880.
25. Maryoto A., Sthenly Gan B., Intang Setyo Hermanto N., Setijadi R. Effect of Calcium Stearate in the Mechanical and Physical Properties of Concrete with PCC and Fly Ash as Binders. Materials. 2020. 13 (6). P. 1394.
26. Lv Y., Luo Y., Song C., Jin W., Xiang T., Qiao M., Dang J., Bai W., Yang Z., Zhao J. Effect of calcium stearate hydrophobic agent on the performance of mortar and reinforcement corrosion in mortar with cracks. Construction and Building Materials. 2024. 450. P. 138684.
27. Fedosov S.V., Rumyantseva V.E., Krasilnikov I.V., Krasilnikova I.A. Research of physical and chemical processes in the system "cement concrete – liquid aggressive environment". Izvestiya vysshikh uchebnykh zavedenii khimiya i khimicheskaya tekhnologiya [ChemChemTech]. 2022. 65 (7). P. 61 – 70.
28. Fedosov S.V., Krasilnikov I.V., Rumyantseva V.E., Krasilnikova I.A. Physical features of the problems of liquid corrosion of reinforced concrete from the standpoint of the theory of heat and mass transfer. Structural Mechanics of Engineering Constructions and Buildings. 2023.19 (4). P. 392 – 409.
29. Krasilnikov I.V., Rumyantseva V.E., Krasilnikova I.A. Selection of the Optimal Composition of Shotcrete According to the Criteria of Durability. Lecture Notes in Civil Engineering. 2025 576 LNCE, P. 309 – 319.
30. Rumyantseva V.E., Krasilnikov I.V., Galtsev A.A., Strokin K.B., Krasilnikova I.A. Industrial safety management during the life cycle of textile industry construction facilities under the influence of fungal microorganisms. Izvestiya Vysshikh Uchebnykh Zavedenii Seriya Teknologiya Tekstil Noi Promyshlennosti. 2025. 1 (415). P. 245 – 257.
Rumyamtseva V.E., Konovalova V.S., Krasilnikov I.V., Strokin K.B., Novikov D.G., Nabiullina K.R., Sabitov L.S., Kiiamova L.I. The effectiveness of internal hydrophobization of concrete in biologically aggressive environments. Construction Materials and Products. 2026. 9 (2). 8. https://doi.org/10.58224/2618-7183-2026-9-2-8