Impact of pore water conductivity and porosity on the electrical conductivity of kaolinite

Hyunwook Choo; Jaewon Song; Woojin Lee; Changho Lee

doi:10.1007/s11440-016-0490-4

Impact of pore water conductivity and porosity on the electrical conductivity of kaolinite

Hyunwook Choo, Jaewon Song, Woojin Lee, Changho Lee

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

The purpose of this study is to quantify the magnitudes of surface conduction and pore water conduction from the measured electrical conductivity of kaolinite, with the ultimate goal of estimating the electrical conductivity of kaolinite with a wide range of pore water conductivities (σ_w = 0.013–3.356 S/m) and porosities (n = 0.368–1.0). Therefore, the theoretical background of the electrical conductivity in soils was reviewed, and electrical conductivity measurements on kaolinite were performed using both slurry and consolidation tests in this study. The results of this study demonstrate that the variations of measured electrical conductivity (σ_mix) with n are debatable according to the values of σ_w, because a decrease in n results in both an increase in surface conduction (K_s) and a decrease in pore water conduction (K_w); this causes the relative magnitude of K_s compared to that of K_w to vary with σ_w and n. Consequently, this study develops the relation between the porosity-normalized K_s/K_w and 1/σ_w. Additionally, the surface conductivity of the tested kaolinite is back-calculated and compared with the previous relationship between K_s and zeta potential of kaolinite. The measured and estimated σ_mix values are compared with the varying pore water conductivity and porosity values.

Original language	English
Pages (from-to)	1419-1429
Number of pages	11
Journal	Acta Geotechnica
Volume	11
Issue number	6
DOIs	https://doi.org/10.1007/s11440-016-0490-4
Publication status	Published - 2016 Dec 1

Bibliographical note

Funding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT, and Future Planning (NRF-2015R1A2A2A01006337) and supported by a Korea University Grant.

Publisher Copyright:
© 2016, Springer-Verlag Berlin Heidelberg.

Keywords

Electrical conductivity
Kaolinite
Pore water conduction
Pore water conductivity
Porosity
Surface conduction

ASJC Scopus subject areas

Geotechnical Engineering and Engineering Geology
Earth and Planetary Sciences (miscellaneous)

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10.1007/s11440-016-0490-4

Cite this

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abstract = "The purpose of this study is to quantify the magnitudes of surface conduction and pore water conduction from the measured electrical conductivity of kaolinite, with the ultimate goal of estimating the electrical conductivity of kaolinite with a wide range of pore water conductivities (σw = 0.013–3.356 S/m) and porosities (n = 0.368–1.0). Therefore, the theoretical background of the electrical conductivity in soils was reviewed, and electrical conductivity measurements on kaolinite were performed using both slurry and consolidation tests in this study. The results of this study demonstrate that the variations of measured electrical conductivity (σmix) with n are debatable according to the values of σw, because a decrease in n results in both an increase in surface conduction (Ks) and a decrease in pore water conduction (Kw); this causes the relative magnitude of Ks compared to that of Kw to vary with σw and n. Consequently, this study develops the relation between the porosity-normalized Ks/Kw and 1/σw. Additionally, the surface conductivity of the tested kaolinite is back-calculated and compared with the previous relationship between Ks and zeta potential of kaolinite. The measured and estimated σmix values are compared with the varying pore water conductivity and porosity values.",

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AB - The purpose of this study is to quantify the magnitudes of surface conduction and pore water conduction from the measured electrical conductivity of kaolinite, with the ultimate goal of estimating the electrical conductivity of kaolinite with a wide range of pore water conductivities (σw = 0.013–3.356 S/m) and porosities (n = 0.368–1.0). Therefore, the theoretical background of the electrical conductivity in soils was reviewed, and electrical conductivity measurements on kaolinite were performed using both slurry and consolidation tests in this study. The results of this study demonstrate that the variations of measured electrical conductivity (σmix) with n are debatable according to the values of σw, because a decrease in n results in both an increase in surface conduction (Ks) and a decrease in pore water conduction (Kw); this causes the relative magnitude of Ks compared to that of Kw to vary with σw and n. Consequently, this study develops the relation between the porosity-normalized Ks/Kw and 1/σw. Additionally, the surface conductivity of the tested kaolinite is back-calculated and compared with the previous relationship between Ks and zeta potential of kaolinite. The measured and estimated σmix values are compared with the varying pore water conductivity and porosity values.

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Impact of pore water conductivity and porosity on the electrical conductivity of kaolinite

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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