Hydration reactions of cement combinations containing vitrified incinerator fly ash

Thomas D. Dyer, Ravindra K. Dhir

    Research output: Contribution to journalArticlepeer-review

    22 Citations (Scopus)

    Abstract

    One treatment option for municipal solid waste incinerator fly ash (IFA) is vitrification. The process yields a material containing reduced levels of trace metals relative to the original ash. The material is glassy and potentially suitable as a cement component in concrete. This paper examines the vitrification of an IFA and studies the hydration reactions of combinations of this vitrified material and Portland cement (PC). Isothermal conduction calorimetry, powder X-ray diffraction (XRD), thermogravimetry (TG) and scanning electron microscopy were employed to study the hydration reactions. As the levels of vitrified ash increase, the quantities of AFt phase produced decrease, whilst quantities of AFm phase increase, due to the reduced levels of sulfate in the vitrified ash. The levels of calcium silicate hydrate (CSH) gel (inferred from estimates of quantities of gel-bound water) remain constant at 28 days regardless of vitrified ash content, indicating that the material is contributing toward the formation of this product.
    Original languageEnglish
    Pages (from-to)849-856
    Number of pages8
    JournalCement and Concrete Research
    Volume34
    Issue number5
    DOIs
    Publication statusPublished - 2004

    Keywords

    • Thermal treatment
    • Hydration products
    • Compressive strength
    • Heavy metals
    • Incinerator fly ash

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