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    Specific Surface Area of Barrier Mixtures at Various Outgas Temperatures

    Source: Journal of Environmental Engineering:;2004:;Volume ( 130 ):;issue: 008
    Author:
    John L. Daniels
    ,
    Hilary I. Inyang
    ,
    Michael Brochu, Jr.
    DOI: 10.1061/(ASCE)0733-9372(2004)130:8(867)
    Publisher: American Society of Civil Engineers
    Abstract: Specific surface area (SSA) values for Fe–smectite alone and mixtures comprising varying proportions of glacial till were determined by nitrogen-adsorption Brunauer–Emmett–Teller analysis under different outgassing temperatures. Additionally, the extent to which the SSA of a mixture was related to the SSA of its components was investigated. A theoretical value for mixture SSA can be computed by summing the products of component SSA and the corresponding weight fraction. This theoretical estimate may not always yield the same value as measured because of a variety of physical and chemical interactions that can lead to either aggregation or dispersion of the constituent matrix. The results are explained in terms of these interactions and within the context of SSA relevance to barrier performance. For mixtures comprising 90% glacial till and 10% Fe–smectite, measured specific surface areas were consistently higher than predicted values for outgassing temperatures beyond 100°C, with a maximum departure of 4 m
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      Specific Surface Area of Barrier Mixtures at Various Outgas Temperatures

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    http://yetl.yabesh.ir/yetl1/handle/yetl/61442
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    contributor authorJohn L. Daniels
    contributor authorHilary I. Inyang
    contributor authorMichael Brochu, Jr.
    date accessioned2017-05-08T21:45:14Z
    date available2017-05-08T21:45:14Z
    date copyrightAugust 2004
    date issued2004
    identifier other%28asce%290733-9372%282004%29130%3A8%28867%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/61442
    description abstractSpecific surface area (SSA) values for Fe–smectite alone and mixtures comprising varying proportions of glacial till were determined by nitrogen-adsorption Brunauer–Emmett–Teller analysis under different outgassing temperatures. Additionally, the extent to which the SSA of a mixture was related to the SSA of its components was investigated. A theoretical value for mixture SSA can be computed by summing the products of component SSA and the corresponding weight fraction. This theoretical estimate may not always yield the same value as measured because of a variety of physical and chemical interactions that can lead to either aggregation or dispersion of the constituent matrix. The results are explained in terms of these interactions and within the context of SSA relevance to barrier performance. For mixtures comprising 90% glacial till and 10% Fe–smectite, measured specific surface areas were consistently higher than predicted values for outgassing temperatures beyond 100°C, with a maximum departure of 4 m
    publisherAmerican Society of Civil Engineers
    titleSpecific Surface Area of Barrier Mixtures at Various Outgas Temperatures
    typeJournal Paper
    journal volume130
    journal issue8
    journal titleJournal of Environmental Engineering
    identifier doi10.1061/(ASCE)0733-9372(2004)130:8(867)
    treeJournal of Environmental Engineering:;2004:;Volume ( 130 ):;issue: 008
    contenttypeFulltext
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