Determination of Silica-Fume Content in Hardened Concrete by AC Impedance Spectroscopy

    Volume 17, Issue 1 (June 1995)

    ISSN: 0149-6123

    CODEN: CCAOAD

    Page Count: 6


    Beaudoin, JJ
    Institute for Research in Construction, Materials Laboratory, Ottawa, Ontario

    Gu, P
    Institute for Research in Construction, Materials Laboratory, Ottawa, Ontario

    Xie, P
    University of Ottawa, Ottawa, Ontario

    Abstract

    A nondestructive method based on AC impedance spectroscopy was applied to studies of the electrical behavior of hydrated portland cement concrete containing silica fume. Silica fume content significantly influenced the impedance behavior of hydrated portland cement concrete. Correlations between the high frequency arc (HFA) diameter and the silica-fume content in concrete were obtained. Empirical relationships for concrete binders at early and more advanced hydration can be expressed as DHFA=Koβsf+Cfor early hydration times and DHFA=C(Ko)βsffor advanced hydration times where DHFA is the high frequency arc diameter, βsf is the silica-fume content, Ko, K′o, C, and C′ are constants related to hydration times and W-C ratio, and so forth.


    Paper ID: CCA10343J

    DOI: 10.1520/CCA10343J

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    Title Determination of Silica-Fume Content in Hardened Concrete by AC Impedance Spectroscopy
    Symposium , 0000-00-00
    Committee C09