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    Volume 6, Issue 2 (July 2017)

    Special Issue Paper

    Frequency- and Time-Domain Dependency of Electrical Properties of Cement-Based Materials during Early Hydration

    (Received 14 September 2016; accepted 30 November 2016)

    Published Online: 2017

    CODEN: ACEMOAD

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    Abstract

    The electrical properties of Portland cement, and cements containing supplementary cementitious materials (SCM), were obtained over the frequency range 1 kHz–10 MHz during the initial 24 h after gauging with water. The response was measured in terms of conductivity and permittivity with both parameters exhibiting significant temporal changes during this period. It was also evident that while the conductivity increased only marginally with increasing frequency of applied electrical field, the permittivity decreased by several orders of magnitude over this frequency range. Moreover, certain features of the permittivity response, which are related to bulk polarization processes, only revealed themselves in the higher frequency range (100 kHz–1 MHz), and went undetected at lower frequencies. The detailed frequency- and time- domain measurements allowed identification of several stages in the early hydration of cement-based materials and the response can be interpreted in terms of hydration kinetics, physico-chemical processes and microstructural development. It is shown that the methodology can be equally applied to cement pastes and concretes.

    Author Information:

    Taha, H. M.
    School of Energy, Geoscience, Infrastructure and Society, Inst. for Infrastructure and Environment, Heriot Watt Univ., Edinburgh,

    McCarter, W. J.
    School of Energy, Geoscience, Infrastructure and Society, Inst. for Infrastructure and Environment, Heriot Watt Univ., Edinburgh,

    Suryanto, B.
    School of Energy, Geoscience, Infrastructure and Society, Inst. for Infrastructure and Environment, Heriot Watt Univ., Edinburgh,

    Starrs, G.
    School of Energy, Geoscience, Infrastructure and Society, Inst. for Infrastructure and Environment, Heriot Watt Univ., Edinburgh,


    Stock #: ACEM20160057

    ISSN:2379-1357

    DOI: 10.1520/ACEM20160057

    Author
    Title Frequency- and Time-Domain Dependency of Electrical Properties of Cement-Based Materials during Early Hydration
    Symposium ,
    Committee C01