The effect of carbonation on the diffusion of chlorides in concrete: experimental analysis and application in calculation
https://doi.org/10.31659/0005-9889-2022-611-3-30-40
Abstract
The article discusses the effect of carbonation on the diffusion of chlorides in concrete based on experimental and theoretical analysis. Chloride penetration tests were carried out on concrete with conventional Portland cement (OPC) and complex binders (SZC), with and without carbonation. The apparent diffusion capacity of chlorides was estimated using an improved diffusion model. The effect of surface carbonation on chloride penetration was investigated in terms of such influencing factors as pore structure, chloride sorption and chemical composition of the pore solution. The results are applied in the design of composite plates exposed to the marine atmosphere. The study shows that: after carbonation, the chloride sorption of OPC concretes is greater than that of SZC concretes with complex binders. About 50 % of the sorption capacity remains in SZC concretes after carbonation; carbonation promotes the diffusion of chlorides, increasing it to 80 %, and affects changes in the pore structure from the perspective of the diffusion of chlorides; the durability requirements should take into account the effect of carbonation of the concrete surface when exposed to marine air environments, but protected from natural precipitation.
About the Authors
S. N. Leonovich
Belarusian National Technical University; Qingdao University of Technology
Belarus
Belarus
Doctor of Sciences (Engineering)
e-mail: leonovichsn@tut.by
E. E. Shaly
Far Eastern Federal University
Russian Federation
Russian Federation
Engineer (postgraduate student)
D. A. Litvinovsky
InzhSpetsStroyProekt LLC
Belarus
Belarus
Main engineer
A. V. Stepanova
Belarusian State University of Transport
Belarus
Belarus
Engineer
A. V. Zhuravskaya
Belarusian National Technical University
Belarus
Belarus
Engineer
V. V. Malyuk
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Review
For citations:
Leonovich S.N., Shaly E.E., Litvinovsky D.A., Stepanova A.V., Zhuravskaya A.V., Malyuk V.V. The effect of carbonation on the diffusion of chlorides in concrete: experimental analysis and application in calculation. Concrete and Reinforced Concrete. 2022;611(3):30-40. (In Russ.) https://doi.org/10.31659/0005-9889-2022-611-3-30-40
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