Influence of Sulfate Ion and Fluoride Ion on the Fluidity of Cement Paste With Polycarboxylate Based Superplasticizer Having Different Molecular Structure

Matsuzawa, Kazuki; Atarashi, Daiki; Miyauchi, Mutsumi; Sakai, Etsuo

doi:10.14250/cement.67.59

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“…The dosage of P-n was fixed at 0.192 mass% of OPC. As previously reported (Matsuzawa et al 2013(Matsuzawa et al , 2014, when the amount of added KF was increased, the apparent viscosity of the cement paste with P-n increased. Moreover, the yield stress of the cement paste with superplasticizer is increased by KF addition.…”

Section: Methodssupporting

confidence: 83%

Working Mechanism of Superplasticizer in Cement Paste with Fluoride Ion

Matsuzawa

Atarashi

Miyauchi

et al. 2015

ACT

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Low-temperature calcination for cement manufacturing by the addition of fluoride compounds has been researched by many investigators. Although it is possible that fluoride ions elute to the suspension after calcination, there are very few studies about the influence of fluoride ion on the fluidity of cement paste with superplasticizer. This paper describes the influence of fluoride ions on the adsorption mechanism of polycarboxylate based superplasticizer in cement paste. When the amount of KF was increased, the viscosity of the cement paste with superplasticizer and the amount of adsorbed superplasticizer increased. The fluidity with the polycarboxylate based superplasticizer containing more functional groups was more susceptive to KF addition and the amount of adsorbed superplasticizer was larger for the polycarboxylate based superplasticizer containing more functional groups. The specific surface area increased with KF addition. In the case of no KF addition, the hydration of alite was retarded by the addition of polycarboxylate based superplasticizer. In contrast, in the case of KF addition, the hydration of alite was not retarded by the addition of superplasticizer. It is supposed that some types of fine particles were generated by KF addition and the fine particles deprived the cement particles of superplasticizer.

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Section: Methodssupporting

confidence: 83%