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Issue
Korean Journal of Chemical Engineering,
Vol.25, No.6, 1553-1561, 2008
Effects of polycarboxylate-type superplasticizer on fluidity and hydration behavior of cement paste
Shin JY, Hong JS, Suh JK, Lee YS
Polycarboxylate (PC)-type superplasticizers were synthesized with different average molecular weight of polyethylene oxide (PEO) graft groups, the molar ratios of graft group to carboxylic group, and then the chemical structure, polymerization condition, and physical and chemical properties were analyzed. In order to evaluate the effects of PC-type superplasticizers in cement paste, the adsorption, the initial plasticity and slump retention characteristics and the degree of hydration reaction were investigated. As the average molecular weight of graft group decreased and molar ratio increased, the conversion rate to copolymers, the adsorption amount of PC-type superplasticizer on cement particles improved; on the other hand, the hydration reaction was delayed.
Keywords: Polycarboxylate (PC); Superplasticizer; Chemical Structure; Slump; Hydration
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