A contribution to the understanding of the fundamental mechanism leading to the retardation of cement hydration caused by polymer particles.

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Polymer particles have an influence on cement hydration. The aim of the suggested project is to evaluate, which of the proposed models in literature, explaining the retarding influence of polymer particles on cement hydration, is valid. Discussed are either the adsorption of polymer particles on cement surfaces or the interaction of the particles with ions on pore solution (especially Ca-ions). In the suggested project a systematic study will be conducted allowing to evaluate which phenomenon is the most thinkable in order to explain the retardation of cement hydration by polymer particles. State-of-the-art methods will be used in order to achieve this aim. Especially calculation of saturation indices using the newest published databased will help getting a deeper understanding of the retardation of cement hydration in the presence of polymer particles.