Effect of Mixture Composition on Washout Resistance of Highly Flowable Underwater Concrete

K. Khayat, Mohamed Sonebi

    Research output: Contribution to journalArticle

    17 Citations (Scopus)

    Abstract

    The underwater casting of relatively thin lifts of concrete in water requires the proportioning of highly flowable concrete that can resist water dilution and segregation and spread readily into place. An investigation was carried out to determine the effects of antiwashout admixture concentration, water-cementitious materials ratio, and binder composition on the washout resistance of highly flowable concrete. Two main types of antiwashout admixtures were used: 1) a powdered welan gum at concentrations of 0.07 and 0.15% (by mass of binder); and 2) a liquid-based cellulosic admixture with dosages up to 1.65 L/100 kg of binder. The water-cementitious materials ratios were set at 0.41 and 0.47, corresponding to high-quality underwater concrete. Four binder compositions were used: a standard Canadian Type 10 cement, the same cement with 10% silica fume replacement, the cement with 50% granulated blast-furnace slag replacement, and a ternary cement containing 6% silica fume and 20% Class F fly ash. The concentrations of anti-washout admixture have direct impact on washout resistance. For a given washout loss, greater slump flow consistency can be achieved with the increases in anti-washout admixture concentration and decreases in water-binder ratio. The washout mass loss can be reduced, for a given consistency
    Original languageEnglish
    Pages (from-to)289-295
    Number of pages7
    JournalACI Materials Journal
    Volume98, No. 4
    Issue number4
    Publication statusPublished - Jul 2001

    ASJC Scopus subject areas

    • Building and Construction
    • Materials Science(all)

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