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    Microstructural Changes in Sand-Bentonite Soils when Exposed to Aniline

    Source: Journal of Geotechnical Engineering:;1995:;Volume ( 121 ):;issue: 002
    Author:
    Nirmala Gnanapragasam
    ,
    Barbara-Ann G. Lewis
    ,
    Richard J. Finno
    DOI: 10.1061/(ASCE)0733-9410(1995)121:2(119)
    Publisher: American Society of Civil Engineers
    Abstract: Bentonite was exposed to aniline through batch experiments and flexible wall conductivity tests. The mineralogy and microstructure of the samples were studied using X-ray diffraction, infrared spectroscopy, scanning electron microscopy, and mercury intrusion porosimetry, before and after aniline exposure. Results indicated that the mineralogical structure of the clay mineral was unaffected by the exposure to aniline, despite evidence that aniline adsorbed onto bentonite upon contact. Tests on sand-bentonite composites showed that the sample with a larger fraction of clay had a greater proportion of fine pores ( <50 μm), thus a lower conductivity to aniline. This is attributed to the phenomenon of the two phase immiscible flow. The conductivity of sand-bentonite composites to aniline appears to be controlled by the soil's pore structure; the amount of bentonite controls the pore size distribution of the sample.
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      Microstructural Changes in Sand-Bentonite Soils when Exposed to Aniline

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    http://yetl.yabesh.ir/yetl1/handle/yetl/21588
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    contributor authorNirmala Gnanapragasam
    contributor authorBarbara-Ann G. Lewis
    contributor authorRichard J. Finno
    date accessioned2017-05-08T20:37:33Z
    date available2017-05-08T20:37:33Z
    date copyrightFebruary 1995
    date issued1995
    identifier other%28asce%290733-9410%281995%29121%3A2%28119%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/21588
    description abstractBentonite was exposed to aniline through batch experiments and flexible wall conductivity tests. The mineralogy and microstructure of the samples were studied using X-ray diffraction, infrared spectroscopy, scanning electron microscopy, and mercury intrusion porosimetry, before and after aniline exposure. Results indicated that the mineralogical structure of the clay mineral was unaffected by the exposure to aniline, despite evidence that aniline adsorbed onto bentonite upon contact. Tests on sand-bentonite composites showed that the sample with a larger fraction of clay had a greater proportion of fine pores ( <50 μm), thus a lower conductivity to aniline. This is attributed to the phenomenon of the two phase immiscible flow. The conductivity of sand-bentonite composites to aniline appears to be controlled by the soil's pore structure; the amount of bentonite controls the pore size distribution of the sample.
    publisherAmerican Society of Civil Engineers
    titleMicrostructural Changes in Sand-Bentonite Soils when Exposed to Aniline
    typeJournal Paper
    journal volume121
    journal issue2
    journal titleJournal of Geotechnical Engineering
    identifier doi10.1061/(ASCE)0733-9410(1995)121:2(119)
    treeJournal of Geotechnical Engineering:;1995:;Volume ( 121 ):;issue: 002
    contenttypeFulltext
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