Fundamental knowledge towards calcined clays is required to understand their impact on rheology and interaction with superplasticizers in cementitious systems. The rheological behavior is investigated by rotational viscometer and mini slump tests and discussed on clinker-free suspensions considering physical properties of one calcined Amaltheen clay and three calcined phyllosilicates (metakaolin, metaillite, metamuscovite). The efficiency of superplasticizers is evaluated for cementitious systems blended with these calcined clays and quartz powder for comparison. Zeta potential, water demand and total surface area are identified as reliable key factors for the demand of superplasticizer - except for metamuscovite. The superplasticizers exhibit better compatibility with quartz-containing calcined Amaltheen clay than with calcined 1:1 or 2:1 phyllosilicates. With the methods used, there is no simple correlation between the interaction of the calcined phyllosilicates with superplasticizers and the latter with a calcined clay containing these phyllosilicates.    «

Fundamental knowledge towards calcined clays is required to understand their impact on rheology and interaction with superplasticizers in cementitious systems. The rheological behavior is investigated by rotational viscometer and mini slump tests and discussed on clinker-free suspensions considering physical properties of one calcined Amaltheen clay and three calcined phyllosilicates (metakaolin, metaillite, metamuscovite). The efficiency of superplasticizers is evaluated for cementitious system...    »