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Environmental Earth Sciences

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01.07.2015 | Original Article

Influence of salt solutions on the swelling behavior of the compacted GMZ01 bentonite

verfasst von: W. M. Ye, C. M. Zhu, Y. G. Chen, B. Chen, Y. J. Cui, J. Wang

Erschienen in: Environmental Earth Sciences | Ausgabe 1/2015

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Abstract

During the long-term operation of a deep geological repository, infiltration of pore fluids with different chemical compositions can influence the swelling behavior of the compacted bentonite. In this paper, using a self-developed swelling deformation apparatus, one-dimensional free swelling tests were conducted on densely compacted GMZ01 bentonite specimen with an initial dry density of 1.70 g/cm³, with infiltration of de-ionized water, NaCl, or CaCl₂ solutions at different concentrations. Results show that the swelling strains of GMZ01 bentonite specimens infiltrated with salt solutions were significantly lower than that of those infiltrated with de-ionized water. In fact, the swelling strain decreased in a form of power function with the increasing concentration of infiltration solutions. For a given concentration, the one-dimensional swelling strain of specimens contacted with NaCl solutions was higher than that of the specimens infiltrated with CaCl₂ solutions. However, the difference of the swelling strains decreased with increasing concentrations. This phenomenon could be explained by the impact of cation types on the microstructure of bentonite.

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Titel: Influence of salt solutions on the swelling behavior of the compacted GMZ01 bentonite
verfasst von: W. M. Ye
C. M. Zhu
Y. G. Chen
B. Chen
Y. J. Cui
J. Wang
Publikationsdatum: 01.07.2015
Verlag: Springer Berlin Heidelberg
Erschienen in: Environmental Earth Sciences / Ausgabe 1/2015
Print ISSN: 1866-6280
Elektronische ISSN: 1866-6299
DOI: https://doi.org/10.1007/s12665-015-4108-1

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