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    Methodology for Analysis of the Reactivity of Coal Fly Ash Using Selective Dissolution by Hydrofluoric Acid

    TitleMethodology for Analysis of the Reactivity of Coal Fly Ash Using Selective Dissolution by Hydrofluoric Acid
    Publication TypePapers in International Journals
    Year of Publication2016
    AuthorsReis R. J. C., Ribeiro M., Abrantes J. C. C., Camões A., Teixeira E. R., and Malheiro R.
    Abstract

    The use of some additions as cement replacement has played an important role in the amount of clinker reduction. Due to its huge worldwide availability one of the most important and recognised replace agent is the fly ash, but is also estimated that only 30 to 40% of fly ash is used, although there are some challenges to be overcome, such as the reactive potential quantification.
    Chemical analysis is typically determined by the oxides content and does not take into account the vitreous and crystalline phase ratio. Therefore, this paper describes in detail one selective dissolution method, based in the hydrofluoric acid attack, to the quantification of the vitreous phase (reactive) and crystalline phases (not reactive). Fly ash from Portuguese Pego thermoelectric power plant was submitted to different attacks. To confirm the method and its effects, chemical and physical analysis were performed, such as STA, XRF, XRD with Rietveld refinement, SEM, EDS and laser diffraction granulometry. The results can be used to quantify the potential reactivity of this type of fly ash. The best results were achieved with 1% hydrofluoric acid attack during 6 hours.

    JournalKey Engineering Materials
    Volume711
    EditionMatteo Colombo, Marco di Prisco
    Pagination1126-1133
    Date Published2016-09-23
    PublisherTrans Tech Publications Ltd
    ISSN1662-9795
    DOIdoi:10.4028/www.scientific.net/KEM.711.1126
    URLhttp://www.scientific.net/KEM.711.1126
    Keywordsacid attack, EDS, Fly ash, Rietveld refinement, selective dissolution, SEM, vitreous phase, XRF
    RightsrestrictedAccess
    Peer reviewedyes
    Statuspublished
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    About CTAC

    The Centre for Territory, Environment and Construction (CTAC) is a research unit of the School of Engineering of University of Minho (UMinho), recognised by the “FCT – Fundação para a Ciência e Tecnologia” (Foundation for Science and Technology), associated to the Department of Civil Engineering (DEC), with whom it shares resources and namely human resources.

    Currently CTAC aggregates 24 researchers holding a PhD of which 20 are faculty professors of the Civil Engineering Department. Read more


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