The usage of superplasticizers for concrete production is beneficial in terms of workability and water reduction.Therefore, superplasticizers enable the production of concretes with increased flowability and high strengths.On the other hand, superplasticizers are also known to retard cement hydration.This is especially true for new polymers based on polycaboxylate ether grafted with side chains.In the present work it is investigated which reaction during the dissolution-precipitation process of cement hydration is mostly affected by these polymers.In order to simplify the complex multiphase cement system, tricalcium silicate (C3S) as main compound of ordinary Portland cement is utilized._Measurements of dissolution rate of C3S, nucleation time during pure crystallization of C-S-H phases and portlandite and calcium complexation capability of superplasticizers have been carried out.