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

Martin Vyšvařil; Pavla Rovnaníková; Martin Keppert

doi:10.4028/www.scientific.net/SSP.276.185

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

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 rheological characterization was completed by frequency sweep tests with the aim of investigating the material behaviour more in detail. 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 kinetic. 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.

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Periodical:

Solid State Phenomena (Volume 276)

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185-191

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.276.185

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Online since:

June 2018

Authors:

Martin Vyšvařil*, Pavla Rovnaníková, Martin Keppert

Keywords:

Alkali Activator, Brick Powder, Dynamic Moduli, Oscillation, Rheology, Silicate Modulus, Yield Stress

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