Phosphate as an anionic anchor group in comb polymers used as cement superplasticizers improved the dispersing effect, sulfate resistance and retardation of cement hydration compared to conventional polycarboxylates. Mechanistically, this is due to strong interaction of the anchor group with cementitious calcium and the resulting high surface affinity. In a developed model system of phosphate-modified polystyrene nanoparticles, the adsorbed layer thickness of superplasticizers as a key parameter for their dispersing effectiveness was recorded under cement-like conditions.
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Phosphate as an anionic anchor group in comb polymers used as cement superplasticizers improved the dispersing effect, sulfate resistance and retardation of cement hydration compared to conventional polycarboxylates. Mechanistically, this is due to strong interaction of the anchor group with cementitious calcium and the resulting high surface affinity. In a developed model system of phosphate-modified polystyrene nanoparticles, the adsorbed layer thickness of superplasticizers as a key parameter...
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