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    Dissolution and carbonation of portlandite [Ca(OH)2] single crystals

    Access Status
    Fulltext not available
    Authors
    Ruiz-Agudo, E.
    Kudlacz, K.
    Putnis, Christine
    Putnis, Andrew
    Rodriguez-Navarro, C.
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Ruiz-Agudo, E. and Kudlacz, K. and Putnis, C. and Putnis, A. and Rodriguez-Navarro, C. 2013. Dissolution and carbonation of portlandite [Ca(OH)2] single crystals. Environmental Science and Technology. 47 (19): pp. 11342-11349.
    Source Title
    Environmental Science and Technology
    DOI
    10.1021/es402061c
    ISSN
    0013-936X
    School
    Department of Chemistry
    URI
    http://hdl.handle.net/20.500.11937/24889
    Collection
    • Curtin Research Publications
    Abstract

    The dissolution and carbonation of portlandite (Ca(OH)2) single crystals was studied by a combination of in situ Atomic Force Microscopy, Scanning Electron Microscopy, and two-dimensional X-ray diffraction. The dissolution of portlandite {0001} surfaces in water proceeds by the formation and expansion of pseudohexagonal etch pits, with edges parallel to ‹100› directions. Etch pits on {010} surfaces are elongated along ‹001›, with edges parallel to ‹101›. The interaction between carbonate-bearing solutions and portlandite results in the dissolution of the substrate coupled with the precipitation of thick islands of CaCO3 that appear oriented on the portlandite substrate. Ex situ carbonation of portlandite in contact with air results in the formation of pseudomorphs that fully preserve the external shape of the original portlandite single crystals. Our observations suggest that portlandite carbonation in contact with air and carbonate-bearing solutions occurs by a similar mechanism, i.e. coupled dissolution–precipitation. Calcite grows epitaxially on {0001} portlandite surfaces with the following orientation: ‹001›Cc∥‹001›Port. Apparently, no porosity is generated during the reaction, which progresses through the formation of fractures. Our results are of relevance to many processes in which the carbonation of portlandite takes place, such as CO2 capture and storage or the carbonation of cementitious materials.

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