La Trobe

Effect of Temperature and Water Salinity on Electrical Surface Conduction of Clay Particles

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posted on 2024-02-20, 00:22 authored by MD Farhad HasanMD Farhad Hasan, Hossam Aboel NagaHossam Aboel Naga
In this study, the combined effect of temperature (T) and pore water salinity on electrical surface conduction parameters was investigated. Two new electrical surface conduction parameters, namely, electrical conductivity of effective solid (σs) and size of diffuse double layer (DDL) water per unit volume of soil (χ), were considered in this study. The tested samples included two commercially available clays and four natural clay soils with diverse physico-chemical properties. The two surface conduction parameters were also used to assess the influence of temperature (T) and pore water salinity, as well as the electrical conductivity of free water (σFW), on the evolution of the free swelling index (FSI) of clays/clay soils through experimental methods. The findings suggested that elevated temperature and σFW increased σs but reduced χ, as well as the FSI of clays/clay soils. Furthermore, the rate of reduction for both χ and FSI augmented under the influence of increased free water salinity, particularly for clays/clay soils with high swelling capacity. The combined reductions of χ and FSI provided substantial evidence that clay DDL thickness decreases as T and σFW increase concurrently.

Funding

This work was carried out when the first author was pursuing a PhD at La Trobe University and was fully financially supported by postgraduate research fellowship from La Trobe University Graduate Research School.

History

Publication Date

2023-08-21

Journal

Minerals

Volume

13

Issue

8

Article Number

1110

Pagination

18p.

Publisher

MDPI

Rights Statement

© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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