Influence of exchangeable cations on hydraulic conductivity of compacted bentonite

Hyang Sig Ahn; Ho Young Jo

doi:10.1016/j.clay.2008.12.018

Influence of exchangeable cations on hydraulic conductivity of compacted bentonite

Hyang Sig Ahn, Ho Young Jo

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

35 Citations (Scopus)

Abstract

Compaction and hydraulic conductivity tests were conducted using deionized (DI) water to determine how exchangeable cations affect the hydraulic conductivity of compacted bentonite. Regardless of the compaction pressure, the maximum dry density decreased and the optimum water content increased with increasing equivalent fraction of Na⁺ ions (X_Na). The hydraulic conductivity decreased with increasing X_Na. The initial dry density of bentonite generally had no effect on the hydraulic conductivity, regardless of the type of exchangeable cations. The hydraulic conductivity of bentonite decreased with increasing a final dry density. The decrease in hydraulic conductivity was more significant at higher X_Na. The difference in hydraulic conductivity of the specimens at a given final dry density decreased with increasing a final dry density. When permeated with DI water, compacted Ca-bentonite with a very high dry density might have a very low hydraulic conductivity (< 10^{- 9} cm/s) similar to compacted Na-bentonite, if no volume change is allowed (i.e. very high effective stress).

Original language	English
Pages (from-to)	144-150
Number of pages	7
Journal	Applied Clay Science
Volume	44
Issue number	1-2
DOIs	https://doi.org/10.1016/j.clay.2008.12.018
Publication status	Published - 2009 Apr

Bibliographical note

Funding Information:
This study was supported by the Korea Research Foundation Grant funded by the Korean Government (MOEHRD) (KRF-2006-331-C00294). The opinions and findings reported in this paper are solely those of the authors, with no endorsement by the funding agency implied.

Keywords

Bentonite
Buffer material
Compaction
Hydraulic conductivity

ASJC Scopus subject areas

Water Science and Technology
Geochemistry and Petrology
Geology
Soil Science

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10.1016/j.clay.2008.12.018

Cite this

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title = "Influence of exchangeable cations on hydraulic conductivity of compacted bentonite",

abstract = "Compaction and hydraulic conductivity tests were conducted using deionized (DI) water to determine how exchangeable cations affect the hydraulic conductivity of compacted bentonite. Regardless of the compaction pressure, the maximum dry density decreased and the optimum water content increased with increasing equivalent fraction of Na+ ions (XNa). The hydraulic conductivity decreased with increasing XNa. The initial dry density of bentonite generally had no effect on the hydraulic conductivity, regardless of the type of exchangeable cations. The hydraulic conductivity of bentonite decreased with increasing a final dry density. The decrease in hydraulic conductivity was more significant at higher XNa. The difference in hydraulic conductivity of the specimens at a given final dry density decreased with increasing a final dry density. When permeated with DI water, compacted Ca-bentonite with a very high dry density might have a very low hydraulic conductivity (< 10- 9 cm/s) similar to compacted Na-bentonite, if no volume change is allowed (i.e. very high effective stress).",

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author = "Ahn, {Hyang Sig} and Jo, {Ho Young}",

note = "Funding Information: This study was supported by the Korea Research Foundation Grant funded by the Korean Government (MOEHRD) (KRF-2006-331-C00294). The opinions and findings reported in this paper are solely those of the authors, with no endorsement by the funding agency implied.",

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AU - Jo, Ho Young

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N2 - Compaction and hydraulic conductivity tests were conducted using deionized (DI) water to determine how exchangeable cations affect the hydraulic conductivity of compacted bentonite. Regardless of the compaction pressure, the maximum dry density decreased and the optimum water content increased with increasing equivalent fraction of Na+ ions (XNa). The hydraulic conductivity decreased with increasing XNa. The initial dry density of bentonite generally had no effect on the hydraulic conductivity, regardless of the type of exchangeable cations. The hydraulic conductivity of bentonite decreased with increasing a final dry density. The decrease in hydraulic conductivity was more significant at higher XNa. The difference in hydraulic conductivity of the specimens at a given final dry density decreased with increasing a final dry density. When permeated with DI water, compacted Ca-bentonite with a very high dry density might have a very low hydraulic conductivity (< 10- 9 cm/s) similar to compacted Na-bentonite, if no volume change is allowed (i.e. very high effective stress).

AB - Compaction and hydraulic conductivity tests were conducted using deionized (DI) water to determine how exchangeable cations affect the hydraulic conductivity of compacted bentonite. Regardless of the compaction pressure, the maximum dry density decreased and the optimum water content increased with increasing equivalent fraction of Na+ ions (XNa). The hydraulic conductivity decreased with increasing XNa. The initial dry density of bentonite generally had no effect on the hydraulic conductivity, regardless of the type of exchangeable cations. The hydraulic conductivity of bentonite decreased with increasing a final dry density. The decrease in hydraulic conductivity was more significant at higher XNa. The difference in hydraulic conductivity of the specimens at a given final dry density decreased with increasing a final dry density. When permeated with DI water, compacted Ca-bentonite with a very high dry density might have a very low hydraulic conductivity (< 10- 9 cm/s) similar to compacted Na-bentonite, if no volume change is allowed (i.e. very high effective stress).

KW - Bentonite

KW - Buffer material

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KW - Hydraulic conductivity

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Influence of exchangeable cations on hydraulic conductivity of compacted bentonite

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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