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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