Abstract
Some expansion of concrete in overground building, bridge construction and hydraulic structure is due to the reaction of alkalies of the cement with some silica constituents of the aggregates. The elementary reactions and the kinetics of the so called Alkali-Silica Reaction are fairly unknown up to today. Preventive measure to diminish the expansion of concrete is of empiric character only. On a physico-chemical background the authors develop a model for the diffusion and the exchange of alkali ions with silano groups of the silica minerals. The model is checked by numerous experiments such as solubility, ion exchange, micro probe patterns, infrared measurements, and it is in fair agreement with the mathematical calculations.
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