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VYŠVAŘIL, M. ROVNANÍKOVÁ, P. KEPPERT, M.
Original Title
Rheological Properties of Alkali-Activated Brick Powder Based Pastes: Effect of Alkali Activator and Silicate Modulus
Type
conference paper
Language
English
Original Abstract
The rheological behaviour of alkali-activated materials prepared by activation of a brick powder by alkaline solution (alkali + water glass) is described. The influence of the composition of activation solution (NaOH vs. KOH, varied silicate modulus) on the flow properties (yield stress, consistency coefficient, fluidity index) and the evolution of the elastic modulus (G´) and the viscous modulus (G″) over time were studied. The results show that the pastes are thixotropic suspensions with very low yield stress. The potassium activator decreases the yield stress and viscosity of the pastes and retards the polymerization kinetics. The brick pastes become more rigid and more viscous with increasing silicate modulus. This also leads to an acceleration of gel formation in brick pastes.
Keywords
brick powder, alkali activator, silicate modulus, rheology, oscillation, yield stress, dynamic moduli
Authors
VYŠVAŘIL, M.; ROVNANÍKOVÁ, P.; KEPPERT, M.
Released
20. 6. 2018
ISBN
978-3-0357-1348-0
Book
Binders, Materials and Technologies in Modern Construction IV
1662-9779
Periodical
Solid State Phenomena
Year of study
2018
Number
276
State
Swiss Confederation
Pages from
185
Pages to
191
Pages count
7
BibTex
@inproceedings{BUT148511, author="Martin {Vyšvařil} and Pavla {Rovnaníková} and Martin {Keppert}", title="Rheological Properties of Alkali-Activated Brick Powder Based Pastes: Effect of Alkali Activator and Silicate Modulus", booktitle="Binders, Materials and Technologies in Modern Construction IV", year="2018", journal="Solid State Phenomena", volume="2018", number="276", pages="185--191", doi="10.4028/www.scientific.net/SSP.276.185", isbn="978-3-0357-1348-0", issn="1662-9779" }