Počet záznamů: 1  

Utilisation of X-Ray computed microtomography for evaluation of iron sulphide distribution in roofing slate

  1. 1.
    0460700 - ÚGN 2017 RIV DE eng A - Abstrakt
    Souček, Kamil - Daněk, T. - Vavro, Martin - Botula, J.
    Utilisation of X-Ray computed microtomography for evaluation of iron sulphide distribution in roofing slate.
    Geophysical Research Abstracts. Göttingen: European Geosciences Union, 2016. ISSN 1607-7962.
    [EGU General Assembly. 18.04.2016-22.04.2016, Vienna]
    Institucionální podpora: RVO:68145535
    Klíčová slova: roofing slate * X-Ray computed microtomography * natural stone
    Kód oboru RIV: JQ - Strojní zařízení a nástroje
    http://meetingorganizer.copernicus.org/EGU2016/EGU2016-2779.pdf

    Roofing slate represents a traditional natural stone used for centuries for roofing and other construction applications
    in various types of buildings. Quality roofing slate must be primarily splittable into large, thin and waterproof
    tiles. In addition, it must be stable in colour and resistant against weathering. The abundance of mineral phases that
    weather easily or minerals that are long-term unstable has the effect of reducing the durability of slates in exterior
    conditions. One of the most problematic rock components, which are in a larger or smaller extent present in almost
    all slates, are iron sulphides, such as pyrite, marcasite or pyrrhotite. Under common atmospheric conditions,
    these minerals tend to oxidise, which leads to the formation of limonite and sulphuric acid. As a consequence of
    the origin of red-brown Fe oxyhydroxides, the undesirable colour changes of the slate may occur. But the most
    serious problem which occurs during this process is the changes in volume. This can cause disintegration of slate
    depending on the form of the iron sulphide occurrence.
    The content and size distribution of iron sulphides in roofing slate is normally determined using the microscopic
    analysis in transmitted light, combined with the observation in reflected light. For quantitative determination of
    iron sulphides in slate, the X-Ray powder diffraction is also often used. The results of the microscopic and X-Ray
    analyses need to be mutually compared and should not differ fundamentally.
    This paper is focused on the assessing the possibility of application of the X-Ray computed microtomography
    (CT) as a new complementary technique enabling the analysis of content and size (volume) distribution of
    iron sulphides in roofing slate.
    Trvalý link: http://hdl.handle.net/11104/0260714

     
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