Model cement systems form the basis for the systematic investigation of three calcined phyllosilicates. Metamuscovite acts as pure filler, accelerates alite hydration and leads to an increased degree of hydration of alite compared to the reference. A different picture emerges for metaillite and metakaolin. Despite the slight filler effect of the clay particles, the alite at the onset of the aluminate clinker reaction as well as after 2 days of hydration reaches significantly lower degrees of hydration. This indicates interaction of the negatively charged calcined clay surfaces with the sulfate from the pore solution. The chemical reactivity of the metaillite and metakaolin during early hydration can be demonstrated by direct quantification as well as by the consumption of portlandite and the formation of C-S-H. This leads to a better understanding of the effect of individual calcined phyllosilicates and help to predict the influence of complex calcined clays on early hydration.    «

Model cement systems form the basis for the systematic investigation of three calcined phyllosilicates. Metamuscovite acts as pure filler, accelerates alite hydration and leads to an increased degree of hydration of alite compared to the reference. A different picture emerges for metaillite and metakaolin. Despite the slight filler effect of the clay particles, the alite at the onset of the aluminate clinker reaction as well as after 2 days of hydration reaches significantly lower degrees of hyd...    »