Suppression of alkali silica reaction using H+-type geopolymer

Motoki Uehara, Takatsune Sato, Atsushi Yamazaki

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    An H+-type geopolymer powder was prepared by grinding a Na+-type geopolymer hardened paste and processing it with sulfuric acid. At pH 7, the extent of cation exchange with Na+ and K+ ions of the H+-type geopolymer powder was one-fourth of that of the original Na+-form geopolymer at the same pH. The ion-exchange capacity of the H+-type geopolymer powder shows pH dependence, that is, has a tendency to increase with higher pH levels. A 10 mass% addition of the H+-type geopolymer reduced both pH and the soluble alkali quantity of the hardened cement pastes to a greater extent than when no addition to the cement paste was made. Further, the injection of cement paste of 40 mass% addition of the H+-type geopolymer suppressed expansion of Alkali-Silica-Reaction more compared to that of the non-addition one.

    Original languageEnglish
    Pages (from-to)90-96
    Number of pages7
    JournalQuarterly Report of RTRI (Railway Technical Research Institute)
    Volume59
    Issue number2
    DOIs
    Publication statusPublished - 2018 May 1

    Keywords

    • Alkali-silica-reaction
    • Coal ash
    • Geopolymer
    • Hydrogen ion
    • Ion-exchange
    • PH

    ASJC Scopus subject areas

    • Mechanical Engineering

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