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    Optimum utilisation of FGD waste in blended binders

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    Authors
    Mangat, P.S.
    Khatib, Jamal M.
    Wright, L.
    Issue Date
    2006
    
    Metadata
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    Abstract
    The pollution caused by the wastes of semi-dry and dry flue gas desulphurisation (FGD) processes and the increasing cost of disposal make their utilisation imperative. The paper presents the first part of a comprehensive investigation to optimise the use of FGD wastes in concrete manufacture. Batches of FGD materials from actual industrial disposal sites and laboratory simulations based on fly ash and gypsum were investigated, representing the following categories: non-siliceous and deleteriously reactive; non-siliceous and non-reactive; siliceous and pozzolanic active. Generic relationships were derived that emphasise the importance ofSO3 content on concrete properties. There is an exponential relationship between strength and SO3 content and also between strength and SiO2+Al2O3. The results show that SiO2–Al2O3–CaSO4- basedFGDwastes withSO3<15% retard early strength but increase long-term strength. Mortars containing fly ash–gypsum (FA–G) blend (25% replacement) with gypsum contents up to 35% (SO3 content up to 18·37%) do not suffer long-term strength reduction. An optimum FA–G blend has an SO3 content less than 10%. Author(s): P.S. Mangat 1 , | J. M. Khatib 2 , | L. Wright 3
    Citation
    Construction Materials, 159(3): 119-127
    Publisher
    Thomas Telford
    URI
    http://hdl.handle.net/2436/15905
    DOI
    10.1680/coma.2006.159.3.119
    Additional Links
    http://www.atypon-link.com/TELF/doi/abs/10.1680/coma.2006.159.3.119
    Type
    Journal article
    Language
    en
    Description
    Metadata only
    ISSN
    1747650X
    17476518
    ae974a485f413a2113503eed53cd6c53
    10.1680/coma.2006.159.3.119
    Scopus Count
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    Faculty of Science and Engineering

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