材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
ポリカルボン酸系高性能AE減水剤の吸着特性および立体障害効果に与える硫酸イオンの影響
加藤 弘義吉岡 一弘中村 明則宮川 豊章
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2000 年 49 巻 9 号 p. 1036-1041

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We discussed the influence of sulfate ion on the fluidizing mechanism of polycarboxylate-based superplasticizers (PC) in cement paste by considering adsorption characteristics of PC and steric hindrance effects. The fluidity, amount of adsorbed PC on cement particles and sulfate ion concentration in aqueous phase were measured using cement paste with some dosages of PC and alkali sulfate. The fluidity of cement paste decreased with increasing alkali sulfate. Clear correlation between the amount of PC adsorbed and the fluidity did not obtain. The fluidity decreased linearly with increasing sulfate ion concentration. We had showed that sulfate ion reduced the thickness of adsorbed PC and steric hindrance effects. The results of this study suggested that sulfate ion reduced the fluidity of cement paste mainly because of reducing steric hindrance effects with any dosage of PC.

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