Estimation of Solute Concentrations in Micro-pore and Macro-pore Solutions of Compacted Bentonite–Sand Mixtures

Ravi, K and Rao, Sudhakar M (2017) Estimation of Solute Concentrations in Micro-pore and Macro-pore Solutions of Compacted Bentonite–Sand Mixtures. In: Geotechnical and Geological Engineering, 35 (1). pp. 517-525. ISSN 0960-3182

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Abstract

Densely compacted bentonite has been identified as a potential buffer in deep geological repositories as the expansive clay satisfies the hydro-mechanical and physico-chemical functions of the buffer material. A key feature in understanding the hydro-mechanical behaviour of compacted bentonite upon exposure to chemical concentration gradients is to estimate the solute concentrations in micro-pore and macro-pore solutions. This study describes a method based on measurements of total surface area, external surface area, c-axis (2d) spacings and volumetric calculations to determine the solute concentrations in micro-pore and macro-pore solutions of compacted bentonite-enhanced sand (BES) specimens. Results of the study with Barmer bentonite-based BES specimens illustrate that cation concentrations in micro-pore and macro-pore solutions are sensitive to variations in dry density. Further, the exchangeable cation concentrations in the micro-pore solution exceed the soluble salt-cation concentrations in the macro-pore solution of Barmer bentonite.

Item Type:	Journal Article
Publication:	Geotechnical and Geological Engineering
Publisher:	Springer International Publishing
Additional Information:	The copyright of this article belongs to the Springer International Publishing.
Keywords:	Bentonite; Cation concentrations; Micro-structure
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	26 May 2022 09:08
Last Modified:	26 May 2022 09:08
URI:	https://eprints.iisc.ac.in/id/eprint/72688

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