Publication detail

Rheological Properties of Alkali-Activated Brick Powder Based Pastes: Effect of Alkali Activator and Silicate Modulus

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

ISBN

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"
}