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    Influence of different monomer ratios and recycled concrete aggregate on mechanical properties and durability of geopolymer concretes

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    Embargo Lift Date
    2021-02-12
    Authors
    Koushkbaghi, M.
    Alipour, P.
    Tahmouresi, B.
    Mohseni, E.
    Saradar, A.
    Sarker, Prabir
    Date
    2019
    Type
    Journal Article
    
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    Citation
    Koushkbaghi, M. and Alipour, P. and Tahmouresi, B. and Mohseni, E. and Saradar, A. and Sarker, P. 2019. Influence of different monomer ratios and recycled concrete aggregate on mechanical properties and durability of geopolymer concretes. Construction and Building Materials. 205: pp. 519-528.
    Source Title
    Construction and Building Materials
    DOI
    10.1016/j.conbuildmat.2019.01.174
    ISSN
    0950-0618
    School
    School of Civil and Mechanical Engineering (CME)
    URI
    http://hdl.handle.net/20.500.11937/73992
    Collection
    • Curtin Research Publications
    Abstract

    Properties of geopolymer concrete using metakaolin (MK) as the aluminosilicate source and recycled concrete aggregate (RCA) as partial replacement of natural aggregate are presented in this paper. The effects of sodium silicate (SS) to sodium hydroxide (SH) ratios, and RCA in different percentages on the mechanical and durability properties of geopolymer concrete were determined. Microstructural changes of geopolymers as a result of using RCA were evaluated via scanning electron microscopic (SEM) images. Test results showed that compressive strength of geopolymer concrete improved with increasing the SS/SH ratio. Although the use of RCA reduced compressive strength by up to 28%, the strength was still high enough for structural applications. In addition, increasing the SS/SH ratio reduced the chloride ion permeability and absorption of geopolymer concrete. The morphology results showed that the deboning width at the interfacial transition zone (ITZ) between RCA and binder decreased with the increase of SS/SH ratio. The polymer products in the proximity of adequate monomer ratios became more uniform and homogenous. Results also showed that the binder with a SS/SH ratio of 3 exhibited higher density and less porosity than that with smaller ratios. Therefore, the recycled construction and demolition waste can significantly contribute to the sustainability of construction industry from technical, economic and environmental points of view.

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