Chloride ingress through alkali activated slag concretes

Muhammed Basheer, Qianmin Ma, Sreejith Nanukuttan, Yun Bai, Changhui Yang

    Research output: Contribution to conferencePaper


    Alkali activated slag (AAS) is a credible alternative to Portland cement (PC) based binder systems. The superior strength gain and low embodied carbon make it a potential binder for next generation concretes. However there is little known about the long term durability of AAS systems, especially the chloride transport and subsequent corrosion of reinforcing steel.
    In this study, chloride transport through 12 AAS concretes with different alkali concentrations (Na2O% of mass of slag) and different modulus (Ms) of sodium silicate solution activator was investigated. A non-steady state chloride diffusion test was used for this study due to its similarity to the real exposure environment in terms of chloride transport through concrete. The results showed that the chloride concentration at the surface (Cs) of AAS concretes was higher than that for PC concrete.
    However, lower non-steady state chloride diffusion coefficient (Dnssd) was obtained for the AAS concretes. The Dnssd of the AAS concretes decreased with the increase of Na2O% and Ms of 1.50 gave the lowest Dnssd. The results are encouraging and it can be concluded that AAS concrete offers a superior performance in terms of chloride transport.
    Original languageEnglish
    Number of pages6
    Publication statusPublished - 28 Aug 2014
    EventCivil Engineering Research in Ireland Conference (CERAI) - QUB, Belfast, United Kingdom
    Duration: 28 Aug 201429 Aug 2014


    ConferenceCivil Engineering Research in Ireland Conference (CERAI)
    CountryUnited Kingdom


    • Alkali activated systems
    • chloride diffusion
    • anionic exchange
    • pore structure
    • chloride binding

    ASJC Scopus subject areas

    • Civil and Structural Engineering


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