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Rheologica Acta

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01-10-2009 | Original Contribution

Reducing shear thickening of cement-based suspensions

Authors: Fabrice Toussaint, Cédric Roy, Pierre-Henri Jézéquel

Published in: Rheologica Acta | Issue 8/2009

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Abstract

Rheological measurements were made on concrete and mortars to characterize the shear thickening behavior of certain concrete mix designs. Shear thickening reduction levers were found by selecting and designing admixtures. Since the shear-thickening phenomena occur at the scale of the finest particles, industrial limestone fillers were studied that behave like cementitious materials. Theories based on previous academic works were relevant. The shear stress-dependent effects of shear thickening and size scaling were very helpful to distinguish between surface interactions, such as lubrication and volumetric contributions and also including the packing effects. The suspension viscosity curves vary accordingly to the Newtonian viscosity of the solvent medium. In both the shear thinning and shear thickening regimes, viscosity is controlled by adjusting the amount of two specific admixtures. The reduction of friction between polymer-coated materials appears to be a key phenomenon to delay onset shear thickening in industrial processes.

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Title: Reducing shear thickening of cement-based suspensions
Authors: Fabrice Toussaint
Cédric Roy
Pierre-Henri Jézéquel
Publication date: 01-10-2009
Publisher: Springer-Verlag
Published in: Rheologica Acta / Issue 8/2009
Print ISSN: 0035-4511
Electronic ISSN: 1435-1528
DOI: https://doi.org/10.1007/s00397-009-0362-z

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Normal and tangential stress fluctuations during jamming

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The future of suspension rheophysics: comments on the 2008 workshop

Microstructure of shear-thickening concentrated suspensions determined by flow-USANS

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