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Interaction Between Naphthalene Sulfonate and Silica Fume in Portland Cement Pastes

Published online by Cambridge University Press:  21 February 2011

Sidney Diamond  and
Leslie J. Struble
Sidney Diamond
Affiliation:
School of Civil Engineering, Purdue University, West Lafayette, IN 47907
Leslie J. Struble
Affiliation:
Center for Building Technology, National Bureau of Standards, Gaithersburg, MD 20899
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Abstract

Portland cement pastes were mixed with predissolved naphthalene sulfonate superplasticizer at normal water:cement ratios. Solutions were separated from the fresh pastes at intervals and the residual concentration of the superplasticizer determined by UV spectrophotometry. At low dosage levels essentially all of the superplasticizer was found to be removed from solution within a few minutes; at high dosage levels a substantial concentration was maintained in solution at least to approximately the time of set. In pastes in which silica fume replaced 10% by weight of the cement, it was found that the incorporation of silica fume significantly increased the uptake of superplasticizer. In separate trials it was found that the silica fume by itself adsorbed little superplasticizer, even from high pH solution simulating that of cement paste.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 114: Symposium R – Bonding in Cementitious Composites , 1987 , 117
Copyright
Copyright © Materials Research Society 1988

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References

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