Superplasticizers zeta potential

The zeta potential is the difference in potential between that of the total dispersed system and that of the layer at the interface of the dispersed particles (in this case cement) and the dispersing medium (water). Many studies have been made of the effect of superplasticizers on the zeta potential of the cement-water system from which the following conclusions can be drawn ... 

Cement has a positive zeta potential which is diminished and eventually becomes negative on the addition of a superplasticizer [31]. 

For the sulfonate-based polymer types of superplasticizer, the zeta potential increases as the molecular weight increases, up to a maximum, as shown in Fig. 2.6 [34]. 

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