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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: Influence of Superplasticizers on the Flocculation Degree of Cement Suspensions
Author(s): Lucia Ferrari and Pascal Boustingorry
Publication: Special Publication
Appears on pages(s): 77-92
Keywords: pumping; civil engineering concrete; viscosity; superplasticizer; phosphonate
Abstract:Cementitious suspensions all feature common flow characteristics when their flow curve is observed. When plotted as shear stress vs shear rate a minimum in stress is observed towards low shear rates which may be related to the hydration of cement. When plotted as apparent viscosity versus shear rate a minimum often appears towards high shear rates, beyond which the suspension enters a shear-thickening regime the origin of which remains unclear.
In between these two limits of shear rate, the expected shear-thinning behaviour takes place, where apparent viscosity may be linked to a shear-rate-dependent degree of suspension flocculation.
The present paper aims at shedding some light onto the origins of those features in the context of mix design and superplasticizer technology.
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