Modelling the carbonated concrete realkalization

The presented model of carbonated concrete realkalization is compiled on the basis of the multi-component medium theory equations. The process equations have been obtained from an analysis of the partial equations of mass, electric charge, momentum, energy, and entropy inequality. The experimental testing reported is related to a theoretical model which determines changes of ion concentrations in the pore solution of the cover, as a result of the realkalization. On the basis of the test results, the process equations have been simplified and formally transformed into the form of an equation for the OH^- ions flow, coupled with the Na⁺ ions transport. By solving the converse problem of this equation, the determinant OH^- ions electro-diffusion coefficient is calculated and then, after taking the experimental test results into account, its numerical values, the range of stable solutions and the influence of the process non-stationariness are determined.