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    Influence of different curing temperatures and alkali activators on properties of GBFS geopolymer mortars containing fly ash and palm-oil fuel ash

    Access Status
    Fulltext not available
    Authors
    Huseien, G.
    Mirza, J.
    Ismail, Mohamed
    Hussin, M.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Huseien, G. and Mirza, J. and Ismail, M. and Hussin, M. 2016. Influence of different curing temperatures and alkali activators on properties of GBFS geopolymer mortars containing fly ash and palm-oil fuel ash. Construction and Building Materials. 125: pp. 1229-1240.
    Source Title
    Construction and Building Materials
    DOI
    10.1016/j.conbuildmat.2016.08.153
    ISSN
    0950-0618
    School
    Curtin Malaysia
    URI
    http://hdl.handle.net/20.500.11937/62443
    Collection
    • Curtin Research Publications
    Abstract

    © 2016 Elsevier Ltd This paper reports the influence of different curing temperatures, calcium content and different types of alkali activator solutions on properties of geopolymer mortars (GPM) containing industrial and agricultural wastes, such as granulated blast furnace slag (GBFS), fly ash (FA) and palm oil fuel ash (POFA). Three kinds of GPM were prepared using activated solutions of sodium hydroxide (NH) with sodium silicate (NS), NS alone, and sodium silicate plus water (NSW). All these mixtures were subjected to eight molar (8 M) concentration of NH solution, alkaline liquid to binder ratio of 0.30, NS to NH ratio of 3.0, binder to fine aggregate ratio of 1.5 at different curing temperatures of 27, 60 and 90 °C. Results revealed that the reaction products and the GPM strengths depended strongly on the nature of compositions, activators and curing temperatures. Alkaline activators formed a crystalline calcium silicate hydrate (CSH) which co-existed with amorphous gel. The observed enhancement in the compressive strength and the microstructure of GPM was attributed to the creation of extra CSH with increasing calcium content. A correlation between the compressive strength and the main product of geopolymerization process, namely, sodium aluminosilicate hydrate (NASH) gel was established based on the bond between Portland cement concrete substrate and GPM.

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