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Influence on OPC hydration of VAE-copolymer dispersion with polyvinyl alcohol as protective colloid was in focus of this study.Experiments were performed using both a commercial OPC as well as synthetic cement phases.It could be shown that the polymer dispersion is not affecting silicate reaction and aluminate reaction during hydration of a commercial OPC while pure alite is significantly retarded in the presence of the polymer.The protective colloid polyvinyl alcohol (PVOH) has a significant impact on hydration of pure alite while its influence on alite hydration is negligible in cement mixes with C3A and sulfate carriers.While the retardation effect of the polymer on alite hydration seems to be less strong when C3A and sulfate carriers are present we can not see an influence of the amount of C3A and sulfate carriers on the extent of silicate reaction retardation.