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HomeKey Engineering MaterialsKey Engineering Materials Vol. 760Rheological Properties of Lime Mortars with Guar...

Rheological Properties of Lime Mortars with Guar Gum Derivatives

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Abstract:

In this paper, the behaviour of fresh lime mortars modified by etherified derivatives of guar (hydroxypropyl guar (HPG), carboxymethyl hydroxypropyl guar (CMHPG) and native guar gum (GG)) is assessed with the purpose of exploring a new application of such derivatives as lime mortar admixtures. The rheological parameters (relative yield stress, consistency coefficient and fluidity index) and viscoelastic properties were correlated with flow table tests, relative density measurements, water retention abilities of mortars and air content in mortars. Results were seen to be strongly dependent on substituents of the guar. Non-ionic derivative (HPG) exhibited the biggest impact on the yield stress and elastic properties of the mortars. The ionic CMHPG showed the thickening effect. GG had low impact on water retention, while HPG and CMHPG displayed high water retention capability.

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Special Concrete and Composites 2017

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Periodical:

Key Engineering Materials (Volume 760)

Pages:

257-265

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.760.257

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Online since:

January 2018

Authors:

Martin Vyšvařil*, Michaela Hegrová, Tomáš Žižlavský

Keywords:

Air Content, Guar Gum, Lime Mortar, Rheology, Viscosity, Water Retention, Yield Stress

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© 2018 Trans Tech Publications Ltd. All Rights Reserved

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