Modeling of Mass Transfer Dynamics in the Processes of Liquid Corrosion of Cement Concretes with Due Regard for the Phenomenon of Colmatation

The results of studies of mass transfer processes occurring in the porous structure of cement concrete under liquid corrosion, taking into account the process of colmatation, are presented. The developed mathematical model of pore colmatation of cement concretes was tested by a full-scale experiment, which resulted in obtaining information about the elemental composition of the sample surface after exposure to a liquid medium, which makes it possible to judge the degree of aggressive action. Using a scanning electron microscope, the depth of penetration of the aggressive medium into the sample was determined and the change in the concentration of reacting ions along the thickness of the sample was set. Based on the data obtained, the values of the mass conductivity and mass transfer coefficients in the system under study were calculated. The calculated mass transfer characteristics indicate that due to pore colmatation, the intensity of mass exchange processes occurring in the sample pores decreases. Using the developed mathematical model of pore colmatation of cement concretes under liquid corrosion, the values of the colmatation rate and the thickness of the colmatant layer in the sample under study were determined. The values obtained during the processing of experimental data are found in the intervals of values of the corresponding values calculated using the mathematical model, which vary exponentially in the thickness of the sample. The mathematical model of concrete pore colmatation based on mass transfer equations makes it possible to estimate the depth of concrete corrosion damages in environments of different degrees of aggressiveness.

S.V. FEDOSOV¹, Doctor of Sciences (Engineering), Academician of RAACS (This email address is being protected from spambots. You need JavaScript enabled to view it.);
V.E. RUMYANTSEVA², Doctor of Sciences (Engineering), Adviser of RAACS (This email address is being protected from spambots. You need JavaScript enabled to view it.),
V.S. KONOVALOVA², Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
A.S. EVSYAKOV², Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.),
N.S. KASYANENKO², Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ National Research Moscow State University of Civil Engineering (26, Yaroslavskoe Highway, Moscow, 129337, Russian Federation)
² Ivanovo State Polytechnical University (21, Sheremetevsky Avenue, Ivanovo, 153000, Russian Federation)

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