This study highlights the suitability of amphoteric (zwitterionic) polycarboxylate-based superplasticizers for a naturally occurring mixed layer clay used as pozzolanic cement substitute after calcination. After a successful synthesis, dispersing performance tests reveal that amphoteric superplasticizers are a promising type of superplasticizer to address both calcined clays and cement. Tailor-made terpolymers can be applied to vary the initial slump by integration of different ratios of cationic monomer. Furthermore, heat flow calorimetry tests with amphoteric superplasticizers point out a less pronounced retardation in cement hydration compared to a standard anionic polymer. Zwitterionic superplasticizers are seen as potential alternatives for common anionic superplasticizers, especially for the advancing replacement of cement clinker with calcined clays of various mineralogical composition. Calcined mixed layer clays are particularly promising as supplementary cementitious materials (SCMs) as they can be fluidized at low dosages of superplasticizers comparable to cement.    «

This study highlights the suitability of amphoteric (zwitterionic) polycarboxylate-based superplasticizers for a naturally occurring mixed layer clay used as pozzolanic cement substitute after calcination. After a successful synthesis, dispersing performance tests reveal that amphoteric superplasticizers are a promising type of superplasticizer to address both calcined clays and cement. Tailor-made terpolymers can be applied to vary the initial slump by integration of different ratios of cationi...    »