bzhbБетон и железобетонConcrete and Reinforced Concrete0005-98893034-1302АО «НИЦ «Строительство»10.31659/0005-9889-2022-611-3-30-40bzhb-81Research ArticleСтатьиВлияние карбонизации на диффузионность хлоридов в бетоне: анализ эксперимента и применение в расчетеThe effect of carbonation on the diffusion of chlorides in concrete: experimental analysis and application in calculationЛеоновичС. Н.LeonovichS. N.

д-р техн. наук

e-mail: leonovichsn@tut.by 

Doctor of Sciences (Engineering)

e-mail: leonovichsn@tut.by 

leonovichsn@tut.byШалыйЕ. Е.ShalyE. E.

инженер (аспирант)

Engineer (postgraduate student)

ЛитвиновскийД. А.LitvinovskyD. A.

гл. инженер

Main engineer

СтепановаА. В.StepanovaA. V.

инженер

Engineer

ЖуравскаяА. В.ZhuravskayaA. V.

инженер

Engineer

МалюкВ. В.MalyukV. V.

генеральный директор

e-mail: mvv.77@mail.ru 

General Director

e-mail: mvv.77@mail.ru 

mvv.77@mail.ruБелорусский национальный технический университет; Qingdao University of TechnologyБеларусьBelarusian National Technical University; Qingdao University of TechnologyBelarusДальневосточный федеральный университетРоссияFar Eastern Federal UniversityRussian FederationООО «ИнжСпецСтройПроект»БеларусьInzhSpetsStroyProekt LLCBelarusБелорусский государственный университет транспортаБеларусьBelarusian State University of TransportBelarusБелорусский национальный технический университетБеларусьBelarusian National Technical UniversityBelarusООО «Трансстрой-Трест»РоссияTransstroy-Trest LLCRussian Federation20221909202361133040Copyright © Леонович С.Н., Шалый Е.Е., Литвиновский Д.А., Степанова А.В., Журавская А.В., Малюк В.В., 20232023Леонович С.Н., Шалый Е.Е., Литвиновский Д.А., Степанова А.В., Журавская А.В., Малюк В.В.Leonovich S.N., Shaly E.E., Litvinovsky D.A., Stepanova A.V., Zhuravskaya A.V., Malyuk V.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.bzhb.ru/jour/article/view/81

Рассматривается влияние карбонизации на диффузионность хлоридов в бетоне на основе экспериментального и теоретического анализа. Испытания на проникновение хлоридов проводились на бетонах с обычным портландцементом (OPC) и комплексными вяжущими (SZC), с карбонизацией и без нее. Кажущаяся диффузионная способность хлоридов оценивалась с помощью усовершенствованной диффузионной модели. Было исследовано влияние карбонизации поверхности на проникновение хлорида с точки зрения таких влияющих факторов, как структура пор, сорбция хлорида и химический состав порового раствора. Результаты применяются в проектировании композитных плит, подвергающихся воздействию морской атмосферы. Исследование показывает, что после карбонизации сорбция хлоридов бетонов OPC больше, чем бетонов SZC со сложными вяжущими. Около 50 % сорбционной способности остается у бетонов SZC после карбонизации; карбонизация способствует диффузии хлоридов, увеличивая ее до 80 %, и влияет на изменения структуры пор с позиции диффузионности хлоридов; в требованиях к долговечности следует учитывать влияние карбонизации бетонной поверхности при воздействии морских воздушных сред, но защищенной от естественных осадков.

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.

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