Hydration and strength development of binder based on high-calcium oil shale fly ash

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    24 Scopus citations

    Abstract

    The properties of high-calcium oil shale fly ash and low-calcium coal fly ash, which are produced in Israeli power stations, were investigated. High-calcium oil shale fly ash was found to conta n a great amount of CaOfree and SO3 in the form of lime and anhydrite. Mixtures of high-calcium oil shalefly ash and low-calcium coal fly ash, termed fly ash binder, were shown to cure and have improved strength. The influence of the composition and curing conditions on the compressive strength of fly ash binders was examined. The microstructure and the composition of fly ash binder after curing and long-term exposure in moist air, water and open air conditions were studied. It was determined that ettringite is the man variable in the strength and durability of cured systems. The positive effect of calcium silicate hydrates, CSH, which are formed by interaction of high-calcium oil shale fly ash and low-calcium coal fly ash components, on the carbonation and dehydration resistance of fly ash binder in open air is pronounced. It was concluded that high-calcium oil shale fly ash with high CaOfree and SO3 content can be used as a binder for building products.

    Original languageEnglish
    Pages (from-to)829-839
    Number of pages11
    JournalCement and Concrete Research
    Volume28
    Issue number6
    DOIs
    StatePublished - 1 Jan 1998

    ASJC Scopus subject areas

    • Building and Construction
    • General Materials Science

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