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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Physicochemical Mechanism of the Action of the Naphthalene Sulfonate Based Superplasticizers on Silica Fume Concretes
Author(s): M. Buil, P. Witier, F. de Larrard,
M. Detrez, and A. M. Paillere
Publication: Special Publication
Appears on pages(s): 959-972
Keywords: adsorption; mortars (material); naphthalene sulfonate;
plasticizers; silica; workability; zeta potential.
Abstract:The adsorption of a naphthalene sulfonate formaldehyde (NSF) superplasticizer on the surface of a silica fume (SF) has been studied by adsorption isotherms and zeta potential measure-ments. A model is proposed for the fixation of NSF on a SF surface in the presence of cement, which can explain the high efficiency of this type of superplasticizer on the Portland cement - SF - Water system. The rheological efficiencies of several SF have been eva-luated by the determination of the water content of one fresh SF mortar composition at a constant workability. An hypothesis is suggested for explaining the higher water demands by the five silicon or ferro-silicon SF tested in this study, compared to a zirconia SF.
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