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    Sorptivity and acid resistance of ambient-cured geopolymer mortars containing nano-silica

    241216_241216.pdf (2.430Mb)
    Access Status
    Open access
    Authors
    Deb, Partha
    Sarker, Prabir
    Barbhuiya, Salim
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Deb, P. and Sarker, P. and Barbhuiya, S. 2016. Sorptivity and acid resistance of ambient-cured geopolymer mortars containing nano-silica. Cement and Concrete Composites. 72: pp. 235-245.
    Source Title
    Cement and Concrete Composites
    DOI
    10.1016/j.cemconcomp.2016.06.017
    ISSN
    0958-9465
    School
    Department of Civil Engineering
    URI
    http://hdl.handle.net/20.500.11937/41839
    Collection
    • Curtin Research Publications
    Abstract

    This study investigated the effects of nano-silica on flowability, strength development, sorptivity and acid resistance properties of fly ash geopolymer mortars cured at 20 C. The changes in mass, compressive strength and microstructure of the specimens after immersion in acid solutions for different durations were determined. The microstructures were studied by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) analysis. It was found that addition of nanosilica in geopolymer mortars based on fly ash alone or fly ash blended with 15% GGBFS or 10% OPC improved the compactness of microstructure by reducing porosity. Thus, the nano-silica reduced sorptivity and increased compressive strength of the mixes. The average mass loss after 90 days of immersion in acid solutions reduced from 6.0% to 1.9% by addition of 2% nano-silica. Similarly, significant reduction in strength loss after immersion in acid solution was observed in the specimens by using nano-silica.

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