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    Compressive strength and microstructure of assorted wastes incorporated geopolymer mortars: Effect of solution molarity

    Access Status
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    Authors
    Huseien, G.
    Ismail, Mohamed
    Khalid, N.
    Hussin, M.
    Mirza, J.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Huseien, G. and Ismail, M. and Khalid, N. and Hussin, M. and Mirza, J. 2018. Compressive strength and microstructure of assorted wastes incorporated geopolymer mortars: Effect of solution molarity. Alexandria Engineering Journal.
    Source Title
    Alexandria Engineering Journal
    DOI
    10.1016/j.aej.2018.07.011
    ISSN
    1110-0168
    School
    Curtin Malaysia
    URI
    http://hdl.handle.net/20.500.11937/73143
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 Faculty of Engineering, Alexandria University This paper presents the solution molarity dependent microstructures and mechanical properties of multi-blend geopolymer mortars (GPMs). Geopolymer mortars were cured at ambient temperature under varying concentration (from 2 to 16 M) of sodium hydroxide (NH) solution. GPMs are by conducting mechanical tests such as compressive, split tensile and flexural strengths and characterised by microstructural studies, such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray spectroscopy (EDS). The effect of Na2O, H2O content, solution modulus (SiO2:Na2O) and Na2O:Al2O3 on GPMs strength were determined. The flow ability and setting time of such GPMs found to decrease linearly with increasing alkali concentration. Conversely, the GPMs comprehensive, split tensile and flexural strengths and the density are enhanced with increasing alkali concentration. Samples activated with 12 M NH solution are most strongly affected by silica dissolution. Furthermore, the ratio of (Na2O:Al2O3) was demonstrated to influence the compressive strength significantly and the (Na2O:Al2O3 = 0.84) presented the optimum strength.

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