Abstract
Two styrene-acrylate (SA) polymer latexes with and without the introduction of PEO hairy layer on the surface of colloidal particles were synthesized. The impacts of the latexes on setting time and cement hydration were evaluated. The hydrolysis of acrylate contained in the polymers and the complexation ability of the generated carboxyl group with Ca2+ were investigated. It is found hairy layer of colloidal particles minimizes the retardation effect on cement hydration, although it does not mitigate the acrylate hydrolysis and the complexation effect of generated carboxyl groups. Hairy surface reduces the adsorption of polymer on cement surface and consequently leads to less retardation effect on cement hydration.
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