Physical features of the problems of liquid corrosion of reinforced concrete from the standpoint of the theory of heat and mass transfer

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Abstract

The results of the study of non-isothermal mass-exchange processes occurring during liquid corrosion of iron-concrete are presented. The degree of development of this direction of research is shown: the classification of liquid corrosion of concrete is given, the effect of “free calcium hydroxide” on the stability of cement stone minerals is described, the relative change in the strength of concrete depending on the dimensionless concentration of calcium hydroxide is shown. For concrete and reinforced concrete structures subjected to liquid corrosion, the boundary value problem of non-isothermal mass transfer in the “cement concrete - liquid” system is formulated on the basis of a nonlinear differential equation of mass conductivity of a parabolic type with an arbitrary form of the initial concentration distribution function and combined boundary conditions of the first, second and third kind. A combined approach to solving the problem of non-isothermal unsteady mass transfer is proposed, based on the division of the life cycle of a building structure into “micro-processes”, followed by the separation of the thickness of the structure within the considered small time interval into concentration zones. Analytical solutions to the problem of unsteady mass transfer in the processes of liquid corrosion of concrete for each selected concentration zone have been obtained, allowing to calculate the concentrations of the target component in the solid phase, thereby predicting the dynamics and kinetics of destructive processes of cement concretes. Extensive numerical experiments have been carried out showing the effect of process parameters on the dynamics and kinetics of liquid corrosion of reinforced concrete.

About the authors

Sergey V. Fedosov

Moscow State University of Civil Engineering (National Research University); Scientific Research Institute of Construction Physics RAASN

Author for correspondence.
Email: fedosov-academic53@mail.ru
ORCID iD: 0000-0001-6117-7529

Academician of the RAASN, Doctor of Technical Sciences, Professor of the Department of Technologies and Organization of Construction

Moscow, Russian Federation

Igor V. Krasilnikov

Scientific Research Institute of Construction Physics RAASN; Ivanovo State Polytechnic University

Email: korasb@mail.ru
ORCID iD: 0000-0003-3694-5906

Candidate of Technical Sciences, Associate Professor of the Department of Construction and Engineering Systems

Moscow, Russian Federation; Ivanovo, Russian Federation

Varvara E. Rumyantseva

Scientific Research Institute of Construction Physics RAASN; Ivanovo Fire Rescue Academy of State Firefighting Service of Ministry of Russian Federation for Civil Defense, Emergencies and Elimination of Consequences of Natural Disasters

Email: varrym@gmail.com
ORCID iD: 0000-0001-7226-4580

Corresponding Member of the RAASN, Doctor of Technical Sciences, Professor, Director of the Institute of Information Technologies, Natural Sciences and Humanities

Moscow, Russian Federation; Ivanovo, Russian Federation

Irina A. Krasilnikova

Vladimir State University

Email: irinanebukina@rambler.ru
ORCID iD: 0000-0002-4342-4255

Candidate of Technical Sciences, Associate Professor of the Department of Chemistry

Vladimir, Russian Federation

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Copyright (c) 2023 Fedosov S.V., Krasilnikov I.V., Rumyantseva V.E., Krasilnikova I.A.

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