RESEARCH OF PHYSICAL AND CHEMICAL PROCESSES IN THE SYSTEM "CEMENT CONCRETE - LIQUID AGGRESSIVE ENVIRONMENT"
Abstract
This article is devoted to an urgent topic - the study of physico-chemical processes during the operation of reinforced concrete structures in aggressive environments. The high importance of calcium hydroxide in the solution of concrete pores is presented, since it is necessary to maintain the stable existence of cement stone minerals. The paper consideres the basic methods of mathematical modeling that are used to describe the physico-chemical processes of the mass transfer of target component (сalcium hydroxide). The possibility of using mathematical models in describing the corrosion of the second stage of cement concretes to determine the mass transfer indicators and calculate the corrosion rate of reinforcing steel and concrete is shown. The mathematical model of mass transfer of target component in dimensionless variabl s was obtained. To obtain a numerical analytic solution of the boundary value problem of non-stationary mass transfer, it is proposed to apply a combined method microprocess. The numerical-analytical solution of the nonlinear initial-boundary value problem of non-stationary mass transfer is obtained, which allows to calculate concentrations of target component in the thickness of a building structure made of concrete or reinforced concrete of cementitious binder but also makes it possible to determine the value of the gradient concentrations of at the interface of phases heterogeneous system «concrete - liquid aggressive environment». The obtained solution allows determining concentration distribution of the target component at any moment of interest in the operation of the building structure, the time processes of reaching the dangerous content of calcium hydroxide located in the preparation pores of to the beginning of decomposition of highly basic compound components (alite, belite, tricalcium aluminate, four-calcium aluminate), and hence moving on to the further stages of study and modeling of corrosion processes. To demonstrate the possibilities of the obtained solution, we will carry out a numerical experiment. It was shown how the field of dimensionless concentrations changes at different values of the Fourier similarity criterion, which in accordance with the theory of similarity is an indicator of the process time.
For citation:
Fedosov S.V., Rumyantseva V.E., Krasilnikov I.V., Krasilnikova I.A. Research of physical and chemical processes in the system "cement concrete - liquid aggressive environment". ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2022. V. 65. N 7. P. 61-70. DOI: 10.6060/ivkkt.20226507.6606.
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