Abstract
The adsorption of naphthalene sulfonate formaldehyde condensate (NSFC) on the surface of cement particles has been measured for slurries based on different class G oil-well cements and is correlated to their rheological properties. The influence of the order of addition on the adsorption and the resulting slurry rheology is shown and discussed. The conditions for the reversibility and irreversibility of NSFC adsorption are discussed. The amount of NSFC adsorbed has been monitored versus time of hydration at 25°C and 85°C. The retarding side effect of this oligomer on the hydration of a cement slurry is described and a mechanism of action proposed.
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