The rheological properties of cement paste in dependence on variation of cement characteristics (chemical and physical properties) are widely discussed in literature. Only a few studies show how the cement hydration products influence the fluidity of the pastes. Results presented here contribute to a better understanding of cement hydration and fluidity. To induce the formation of certain hydration products we systematically modified the cement composition by adding alkali sulphates. Furthermore results of rheology, phase analysis and microstructural investigations were combined in order to reveal the influence of hydration products on the fluidity of the cement paste. Thereby it is shown how the growth of long prismatic crystals like syngenite decreases paste fluidity. The increase in fluidity during continuous stirring is attributed to microstructural changes.
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