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    Effects of Ultrafine Fly Ash on Setting, Strength, and Porosity of Geopolymers Cured at Room Temperature

    Access Status
    Fulltext not available
    Authors
    Deb, Partha Sarathi
    Sarker, Prabir
    Date
    2017
    Type
    Journal Article
    
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    Citation
    Deb, P. and Sarker, P. 2017. Effects of Ultrafine Fly Ash on Setting, Strength, and Porosity of Geopolymers Cured at Room Temperature. Journal of Materials in Civil Engineering. 29 (2): 06016021.
    Source Title
    Journal of Materials in Civil Engineering
    DOI
    10.1061/(ASCE)MT.1943-5533.0001745
    ISSN
    1943-5533
    School
    Department of Civil Engineering
    URI
    http://hdl.handle.net/20.500.11937/17558
    Collection
    • Curtin Research Publications
    Abstract

    This paper presents the effects of ultrafine fly ash on setting, strength and porosity of geopolymer paste specimens cured at 20°C. Addition of ultrafine fly ash reduced setting time and improved compressive strength of geopolymers based on fly ash only or fly ash blended with 15% ground granulated blast-furnace slag (GGBFS) or 10% ordinary portland cement (OPC). With the addition of ultrafine fly ash, a reduction in porosity was observed by the mercury intrusion porosimetry (MIP) and a denser microstructure was observed by the scanning electron microscope (SEM) photographs. Thus, for room temperature curing conditions, a control on the setting time and improvements of strength and porosity of geopolymers could be achieved by varying the percentage of ultrafine fly ash.

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