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Hydro-mechanical properties of Calcigel-polyacrylamide composites

Published online by Cambridge University Press:  02 January 2018

Hanna Haase  and
Tom Schanz
Hanna Haase*
Affiliation:
Chair of Foundation Engineering, Soil and Rock Mechanics, Ruhr-Universität Bochum, Universitätsstraße 150, 44780 Bochum, Germany
Tom Schanz
Affiliation:
Chair of Foundation Engineering, Soil and Rock Mechanics, Ruhr-Universität Bochum, Universitätsstraße 150, 44780 Bochum, Germany
*
*E-mail: hanna.haase@rub.de
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Abstract

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Calcigel bentonite-polyacrylamide (PAA) composites were investigated for their formation characteristics and their macroscopic hydro-mechanical and microscopic structural properties. The composites prepared were different in terms of the polymer charge, i.e. cationic (PAA+), anionic (PAA−), non-ionic (PAA°) and in terms of the polymer-to-clay ratio. The latter varied according to the individual maximum sorption capacity established from adsorption isotherms. Oedometer and waterretention testswere conducted on composites prepared under initial slurry conditions. The microstructure of the composites was investigated using environmental scanning electron microscopy (ESEM). At low stress, distinctly increased void ratios were found for all types of the composites, whereas under highstress conditions only the PAA+-composite prepared at 100% of the maximum sorption capacity showed an increase in void ratio. Analyses by ESEM on this composite indicated structural changes related to the preferential face-to-face aggregation, which help to explain the macroscopic behaviour and also account for the increased hydraulic permeabilities observed.

Keywords

adsorption isothermsbentoniteclay-polymer compositescompressibilitysoil water characteristic curve
Type
Research Article
Information
Clay Minerals , Volume 50 , Issue 3 , August 2015 , pp. 377 - 389
Creative Commons
Creative Common License - CCCreative Common License - BY
Copyright © The Mineralogical Society of Great Britain and Ireland 2015 This is an Open Access article, distributed under the terms of the Creative Commons Attribution license. (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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