Monitoring the Influence of Water and Ionic Ingress on Cover-Zone Concrete Subjected to Repeated Absorption

William J. McCarter

    Research output: Contribution to journalArticle

    Abstract

    This paper presents data from a test program investigating water and ionic movement in the cover region of reinforced concrete under a cyclic wetting and drying regime. Experiments were conducted over an eighteen month period on slabs containing OPC and OPC with partial replacement with PFA and GGBS, with samples being exposed to water and chloride solution. Water and ionic ingress through the cover zone was monitored by means of small conductivity probes embedded within the surface of 50-mm concrete specimens. The conductivity profiles obtained from the experimental program highlight the influence of repeated absorption on water and ionic ingress, hydration, pozzolanic activity and chloride binding. A simple electrical model was used to explain the influence of pore fluid and microstructure on conductivity. Traditional methods of examination were also employed to corroborate conductivity data and included cumulative volumetric gain, coring for carbonation and chloride ingress, and drillings for chloride concentration profiles.

    Original languageEnglish
    Pages (from-to)55-63
    Number of pages9
    JournalCement, Concrete and Aggregates
    Volume18
    Issue number1
    Publication statusPublished - Jun 1996

    Fingerprint

    conductivity
    chloride
    monitoring
    water
    reinforced concrete
    hydration
    wetting
    slab
    microstructure
    replacement
    probe
    drilling
    fluid
    experiment
    programme

    Keywords

    • Absorption
    • Chlorides
    • Concrete
    • Cover
    • Durability
    • Electrical conductivity
    • Pozzolans

    Cite this

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    abstract = "This paper presents data from a test program investigating water and ionic movement in the cover region of reinforced concrete under a cyclic wetting and drying regime. Experiments were conducted over an eighteen month period on slabs containing OPC and OPC with partial replacement with PFA and GGBS, with samples being exposed to water and chloride solution. Water and ionic ingress through the cover zone was monitored by means of small conductivity probes embedded within the surface of 50-mm concrete specimens. The conductivity profiles obtained from the experimental program highlight the influence of repeated absorption on water and ionic ingress, hydration, pozzolanic activity and chloride binding. A simple electrical model was used to explain the influence of pore fluid and microstructure on conductivity. Traditional methods of examination were also employed to corroborate conductivity data and included cumulative volumetric gain, coring for carbonation and chloride ingress, and drillings for chloride concentration profiles.",
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    Monitoring the Influence of Water and Ionic Ingress on Cover-Zone Concrete Subjected to Repeated Absorption. / McCarter, William J.

    In: Cement, Concrete and Aggregates, Vol. 18, No. 1, 06.1996, p. 55-63.

    Research output: Contribution to journalArticle

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