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Utilisation of Sand from KaolinWashing for the Manufacture of Alkali-activated Artificial Sandstone

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    0475839 - ÚGN 2018 RIV DE eng A - Abstract
    Vavro, Martin - Vavro, Leona - Mec, P. - Souček, Kamil - Pticen, F. - Reiterman, P.
    Utilisation of Sand from KaolinWashing for the Manufacture of Alkali-activated Artificial Sandstone.
    EGU General Assembly, EGU2017, Conference Proceedings. Vol. 19. Mnichov: EGU – European Geosciences Union GmbH, 2017. s. 10626-10626. E-ISSN 1607-7962.
    [EGU General Assembly - EGU2017. 23.04.2017-28.04.2017, Vídeň]
    Institutional support: RVO:68145535
    Keywords : natural stones * sandstones * artificial materials
    OECD category: Mining and mineral processing

    Sandstones represent a traditional natural stones which are widely used in Czech architecture and sculpture over a long time. Thanks to their relatively easy workability, sandstones provide a wide range of stone products and also represent a popular material for architectural and sculptural purposes. In the field of restoration of artworks, they are therefore often used for manufacturing stone statue copies originally made from the same or similar type of stone. Despite a relatively common and varied occurrence of natural sandstones, the method of the artificial stone facsimiles creation in the form of various cast elements is also often applied in restoration practice. The history of application of artificial stones in civil engineering and architecture goes back to the ancient times, i.e. to Roman antiquity and possibly up to the time of ancient Egypt. The lack of appropriate natural rock, suitable in the view of colour, grain size or texture is the main reason of manufacturing copies based on synthetic mixtures. The other reason is high financial costs to create a sculpture copy from natural materials. Mixtures made from white and/or grey cements, sands, carefully selected crushed stone or well graded natural gravels, and mineral coloring pigments or mixtures with acrylate, polyester, and epoxy resins binder are the most frequently used artificial materials for cast stone manufacturing. This paper aims to bring information about composition and properties of artificial sandstones made from alkali-activated binder mixtures based on metakaolin and granulated blast furnace slag. The filler of this artificial stone is represented by fine-grained sand generated during kaolin wet processing. Used sand is mainly formed by quartz, feldspars, micas (muscovite > biotite), residual kaolin, and to a lesser extent also by Fe oxyhydroxides ('limonite'), titanium dioxide mineral (probably anatase), and carbonate mineral unidentified in detail.
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