Effects of Superplasticizers, Powder Fineness, and Solution Electrolyte Content on the Rheology of Model Paste Systems

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Title: Effects of Superplasticizers, Powder Fineness, and Solution Electrolyte Content on the Rheology of Model Paste Systems

Author(s): D. S. Swift and P. F G. Banfill

Publication: Special Publication

Volume: 217

Issue:

Appears on pages(s): 499-512

Keywords: ground granulated blastfurnace slag; lignosulfonate; magnesium oxide; polycarboxylate; rheology

Date: 9/1/2003

Abstract:
Model hydraulically inactive powders have been used to investigate the effect of polycarboxylate and lignosulfonate superplasticizers. A new rotational rheometer, avoiding the risks of sample separation, slippage and uncertain shear history, was used. Magnesium oxide can be used to model the rheology of cement pastes but an appropriate solution electrolyte composition must be used. Ground granulated blastfurnace slag can be used but results are sensitive to glass content and particle fineness. The effects of admixture chemistry can be studied using model paste systems.