Modeling of concrete deterioration by alkali-silica reaction

The paper is concerned with a macroscopic model for the description of concrete deterioration by alkali-silica reaction. Based on concepts of the Theory of Porous Media, concrete is regarded as a mixture of three superimposed and interacting constituents: the skeleton, the pore liquid and the pore gas. The skeleton in turn represents a mixture of the unreacted, un-swollen and the already reacted, swollen material. When ASR takes place, mass of the unreacted material is non-instantaneously converted into mass of the reacted material. Since the unreacted material is characterized by a smaller density, the material swells. In the proposed model the dependence of the kinetics and the magnitude of the swelling process on the moisture content is taken into account. The suitability of the model is investigated, at least partially, by means of one-dimensional parametric studies.