The paper is devoted to counteraction of SO42- ions transport in concrete, exploited in sulfate mediums, for prevention of steel reinforcement corrosion. Protective surface coating based on alkali-activated aluminosilicate binder was proposed as a mean to restrict SO42- ions transport in concrete. It was shown that the coating with thickness of 3 mm ensures total concrete protection. It was revealed that permeability of concrete depending on cation decreases in the row (NH4)2SO4>Na2SO4>MgSO4. The work of protective coating was simulated by adding of specified salts in the binder. Decreasing of pH values of water extracts during hydration of binder while using of 2.5 % MgSO4 is evidence of advanced crystallinity of zeolite-like sulfate-containing hydroaluminosilicates with participation of Mg2+ ions equal to Са2+ ions. While content of (NH4)2SO4 was increased up to 5.0 % less pH was fixed due to decelerated formation of other zeolite-like minerals. Stability of pH values in presence of Na2SO4 (0.5…2.5 %) was caused by no influence on structure formation. Thus, the restriction of SO42- ions transport in protective coating is due to their binding by alkaline aluminosilicate binder in zeolite-like minerals with higher crystallinity in presence of Na+, NH4+ and Mg2+ cations from sulfates.
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7 December 2023
5TH INTERNATIONAL SCIENTIFIC AND PRACTICAL CONFERENCE “INNOVATIVE TECHNOLOGY IN ARCHITECTURE AND DESIGN” (ITAD-2021)
20–21 May 2021
Kharkiv, Ukraine
Research Article|
December 07 2023
Resistance of protective coating based on alkali-activated aluminosilicate binder to influence of SO4-containing medium
Pavel Krivenko;
Pavel Krivenko
1
Scientific Research Institute for Binders and Materials, Kyiv National University of Construction and Architecture
, 03037 Povitroflotskyi Avenue, 31, Kyiv, Ukraine
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Volodymyr Kyrychok;
Volodymyr Kyrychok
1
Scientific Research Institute for Binders and Materials, Kyiv National University of Construction and Architecture
, 03037 Povitroflotskyi Avenue, 31, Kyiv, Ukraine
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Igor Rudenko;
Igor Rudenko
1
Scientific Research Institute for Binders and Materials, Kyiv National University of Construction and Architecture
, 03037 Povitroflotskyi Avenue, 31, Kyiv, Ukraine
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Oleksandr Konstantynovskyi
Oleksandr Konstantynovskyi
a)
1
Scientific Research Institute for Binders and Materials, Kyiv National University of Construction and Architecture
, 03037 Povitroflotskyi Avenue, 31, Kyiv, Ukraine
a)Corresponding author: [email protected]
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a)Corresponding author: [email protected]
AIP Conf. Proc. 2490, 050013 (2023)
Citation
Pavel Krivenko, Volodymyr Kyrychok, Igor Rudenko, Oleksandr Konstantynovskyi; Resistance of protective coating based on alkali-activated aluminosilicate binder to influence of SO4-containing medium. AIP Conf. Proc. 7 December 2023; 2490 (1): 050013. https://doi.org/10.1063/5.0122733
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