Abstract
The role of calcium sulphate on the zeta-potential (ZP) of portland cement in the presence of a superplasticizer was studied as a function of hydration time. Also the influence of calcium sulphate upon the adsorption of a superplasticizer was studied by UV-spectroscopy as a function of hydration time. The data indicate that the amount of superplasticizer adsorbed decreases as the calcium sulphate concentration increases. The same influence is seen on the ZP, which when compared with the UV-absorption results shows that an increase in calcium sulphate concentration decreases the double-layer thickness thereby decreasing the amount of superplasticizer adsorbed, and therefore the ZP.
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