The complex impedance response of fly-ash cements revisited

W. J. McCarter, G. Starrs, Malcolm Chrisp

    Research output: Contribution to journalArticle

    23 Citations (Scopus)

    Abstract

    It has been reported in a previous study [Cem. Concr. Res. 29 (1999) 377; Cem. Concr. Res. 33 (2003) 197] that when a low-lime fly ash is introduced as a cementitious component, there are significant changes in the electrical response of the system, most notably, an enhancement in dielectric constant and the emergence of a plateau region in the complex plane. The changes in electrical behaviour were attributed to the spherical nature of the fly-ash particle, resulting in an enhancement in the double-layer polarization effects on the particle surface. In this paper, data are presented for three low-lime ashes, each displaying differences in their electrical behaviour. Through a systematic series of tests, a new interpretation for the origin of the characteristic electrical response is presented. © 2004 Elsevier Ltd. All rights reserved.

    Original languageEnglish
    Pages (from-to)1837-1843
    Number of pages7
    JournalCement and Concrete Research
    Volume34
    Issue number10
    DOIs
    Publication statusPublished - Oct 2004

    Keywords

    • Characterization
    • Electrical properties
    • Fly ash
    • Loss on ignition
    • Mortar

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