Porewater chemistry in compacted bentonite

Arto Muurinen, Jarmo Lehikoinen

    Research output: Contribution to journalArticleScientificpeer-review

    43 Citations (Scopus)

    Abstract

    The porewater chemistry in compacted bentonite was studied in solution–bentonite interaction experiments. The parameters varied in the experiments were the bentonite density, bentonite-to-water ratio (B/W), ionic strength of the solution, and the composition of bentonite. The bentonite types used in the experiments were Volclay MX80 and artificial bentonites prepared from purified MX-80 in sodium form where CaCO3 and CaSO4 were added. At the end of the experiment, the equilibrating external solution and the porewater squeezed out of the bentonite were analyzed to give information for interpretation of the interaction. The equilibrium was modelled with the HYDRAQL code.

    The evolution of porewater chemistry was determined by the dissolving components initially present in the bentonite together with the ions entering with water from the surroundings. Ion-exchange processes occurred between the bentonite and the porewater. The concentrations in the external solution and porewater strongly depended on the B/W used. The concentrations in the squeezed porewaters were clearly lower than in the equilibrating waters. The modelling results reasonably fit the experimental data.
    Original languageEnglish
    Pages (from-to)207-214
    Number of pages8
    JournalEngineering Geology
    Volume54
    Issue number1-2
    DOIs
    Publication statusPublished - 1999
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Bentonite
    bentonite
    porewater
    experiment
    Experiments
    Water
    Ionic strength
    water
    ion exchange
    Ion exchange
    Sodium
    sodium
    ion
    Ions
    Chemical analysis
    modeling

    Cite this

    Muurinen, Arto ; Lehikoinen, Jarmo. / Porewater chemistry in compacted bentonite. In: Engineering Geology. 1999 ; Vol. 54, No. 1-2. pp. 207-214.
    @article{a2d15e92f6834db7b2ea02e2bfb39198,
    title = "Porewater chemistry in compacted bentonite",
    abstract = "The porewater chemistry in compacted bentonite was studied in solution–bentonite interaction experiments. The parameters varied in the experiments were the bentonite density, bentonite-to-water ratio (B/W), ionic strength of the solution, and the composition of bentonite. The bentonite types used in the experiments were Volclay MX80 and artificial bentonites prepared from purified MX-80 in sodium form where CaCO3 and CaSO4 were added. At the end of the experiment, the equilibrating external solution and the porewater squeezed out of the bentonite were analyzed to give information for interpretation of the interaction. The equilibrium was modelled with the HYDRAQL code.The evolution of porewater chemistry was determined by the dissolving components initially present in the bentonite together with the ions entering with water from the surroundings. Ion-exchange processes occurred between the bentonite and the porewater. The concentrations in the external solution and porewater strongly depended on the B/W used. The concentrations in the squeezed porewaters were clearly lower than in the equilibrating waters. The modelling results reasonably fit the experimental data.",
    author = "Arto Muurinen and Jarmo Lehikoinen",
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    language = "English",
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    Muurinen, A & Lehikoinen, J 1999, 'Porewater chemistry in compacted bentonite', Engineering Geology, vol. 54, no. 1-2, pp. 207-214. https://doi.org/10.1016/S0013-7952(99)00075-7

    Porewater chemistry in compacted bentonite. / Muurinen, Arto; Lehikoinen, Jarmo.

    In: Engineering Geology, Vol. 54, No. 1-2, 1999, p. 207-214.

    Research output: Contribution to journalArticleScientificpeer-review

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    AB - The porewater chemistry in compacted bentonite was studied in solution–bentonite interaction experiments. The parameters varied in the experiments were the bentonite density, bentonite-to-water ratio (B/W), ionic strength of the solution, and the composition of bentonite. The bentonite types used in the experiments were Volclay MX80 and artificial bentonites prepared from purified MX-80 in sodium form where CaCO3 and CaSO4 were added. At the end of the experiment, the equilibrating external solution and the porewater squeezed out of the bentonite were analyzed to give information for interpretation of the interaction. The equilibrium was modelled with the HYDRAQL code.The evolution of porewater chemistry was determined by the dissolving components initially present in the bentonite together with the ions entering with water from the surroundings. Ion-exchange processes occurred between the bentonite and the porewater. The concentrations in the external solution and porewater strongly depended on the B/W used. The concentrations in the squeezed porewaters were clearly lower than in the equilibrating waters. The modelling results reasonably fit the experimental data.

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