Chloride induced corrosion of steel bars in alkali activated slag concretes

    Research output: Contribution to conferencePaperpeer-review

    Abstract

    The studies on chloride induced corrosion of steel bars in alkali activated slag (AAS) concretes are scarcely reported in the past. In order to make this issue clearer and compare the corrosion performance of AAS with Portland cement (PC) counterpart, an investigation was carried out and the results are reported in this paper. Corrosion properties were assessed with the help of rate of corrosion, electrical resistivity and pore solution chemistry. It was found that: (i) steel corrosion resistance of the AAS concretes was comparable or in some cases even worse than that of Portland cement (PC) concrete under intermittent chloride ponding regime; (ii) the corrosion behaviour of the AAS concretes was significantly influenced by ionic exchange, carbonation and sulphide concentration; (iii) the increase of alkali concentration of the activator generally reduced chloride resulting corrosion, and a value of 1.5 was found to be an optimum modulus for the activator for improving the corrosion resistance.
    Original languageEnglish
    Publication statusPublished - 19 Dec 2015
    Event2nd R.N. Raikar International Conference and Banthia-Basheer International Symposium - Mumbai, India
    Duration: 18 Dec 201519 Dec 2015

    Conference

    Conference2nd R.N. Raikar International Conference and Banthia-Basheer International Symposium
    CountryIndia
    CityMumbai
    Period18/12/201519/12/2015

    Keywords

    • chloride diffusivity
    • alkali activated slag
    • rate of corrosion
    • bulk electrical resistivity
    • pH Profiles
    • pore solution chemistry

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Civil and Structural Engineering

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