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    Performance of a Fly Ash Geopolymeric Based Binder with Calcium Hydroxide, Portland Cement and Metakaolin as Additives

    ProjectIF/00706/2014-UM.1.15
    TitlePerformance of a Fly Ash Geopolymeric Based Binder with Calcium Hydroxide, Portland Cement and Metakaolin as Additives
    Publication TypePapers in International Journals
    Year of Publication2018
    AuthorsKheradmand M., Abdollahnejad Z., and Pacheco-Torgal, F.
    Abstract

    Geopolymeric binders are especially indicated when reusing a wide diversity of wastes. This is an important feature, especially in the European context,  in which a circular economy and future zero waste is targeted. Still, the cost of these materials, due to the use of high purity activators, prevents their commercialization as they are simply not competitive enough. The reduction of the amount of activators could be a cost-efficient solution if the associated decrease of the mechanical properties turned not to be excessive. This means that it is important to investigate the manner in which these additives can be used on their composition in order to compensate that mechanical reduction. This paper discloses results concerning the mix design of fly ash based geopolymeric mixtures using metakaolin, Portland cement (OPC) and calcium hydroxide as additives. Their influence on the mechanical properties, microstructure and cost-efficiency was studied. The results showed that the use of  Portland cement as an additive leads to lower compressive strength.  Results also show that geopolymers with different additives have different optimum Na2SiO3/NaOH ratios.

    JournalThe Open Civil Engineering Journal
    Volume12
    Pagination1-20
    Date Published2018-06-01
    PublisherBentham
    ISSN1874-1495
    DOI10.2174/187414950181201
    KeywordsCompressive strength, cost analysis, Fly ash, Geopolymer, Microstructure, Mix design, Waste reuse
    RightsembargoedAccess (2 Years)
    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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