Title:
Influence of Superplasticizers on the Flocculation Degree of Cement Suspensions
Author(s):
Lucia Ferrari and Pascal Boustingorry
Publication:
Symposium Paper
Volume:
302
Issue:
Appears on pages(s):
77-92
Keywords:
pumping; civil engineering concrete; viscosity; superplasticizer; phosphonate
DOI:
10.14359/51688086
Date:
6/1/2015
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.