Use of electrochemical impedance spectroscopy to monitor delamination and moisture uptake in CFRP-reinforced concrete structures

G. D. Davis, M. J. Rich, L. T. Drzal

    Research output: ResearchConference contribution

    Abstract

    Electrochemical impedance spectroscopy (EIS) electrodes have been used to inspect carbon fiber-reinforced polymer (CFRP)-reinforced concrete structures exposed to a variety of laboratory test conditions (salt fog, alternate immersion in fresh water, alternate immersion in salt water, 100% relative humidity, 50% relative humidity, elevated temperatures, and below-freezing temperatures). Other specimens were used to investigate the detection of delamination between the CFRP and the concrete using a wedge test. External electrodes, coupled with the embedded rebar, provided the best results. Equivalent circuit modeling was used to analyze the impedance spectra. Several circuit parameters, especially the capacitance and constant phase element (CPE) magnitude, correlated very well with both bonded area/delamination and moisture content. The different relationships between the different circuit parameters and moisture uptake or bonded CFRP-concrete area should allow these two material characteristics to be separately determined. Differences in the different exposure conditions were seen and explained. Coupled with a commercially available portable potentiostat, these measurements can be made in the field to facilitate inspection of concrete structures reinforced with CFRP, such as bridges.

    LanguageEnglish (US)
    Title of host publicationProceedings of the American Society for Composites - 30th Technical Conference, ACS 2015
    PublisherDEStech Publications
    ISBN (Electronic)9781605952253
    StatePublished - 2015
    Event30th Annual Technical Conference of the American Society for Composites, ASC 2015 - East Lansing, United States
    Duration: Sep 28 2015Sep 30 2015

    Other

    Other30th Annual Technical Conference of the American Society for Composites, ASC 2015
    CountryUnited States
    CityEast Lansing
    Period9/28/159/30/15

    Profile

    Electrochemical impedance spectroscopy
    Delamination
    Concrete construction
    Reinforced concrete
    Polymers
    Moisture
    carbon fiber
    Carbon fibers
    Atmospheric humidity
    Concretes
    Electrodes
    Networks (circuits)
    Temperature
    Saline water
    Fog
    Freezing
    Equivalent circuits
    Capacitance
    Salts
    Inspection

    ASJC Scopus subject areas

    • Ceramics and Composites

    Cite this

    Davis, G. D., Rich, M. J., & Drzal, L. T. (2015). Use of electrochemical impedance spectroscopy to monitor delamination and moisture uptake in CFRP-reinforced concrete structures. In Proceedings of the American Society for Composites - 30th Technical Conference, ACS 2015 DEStech Publications.

    Use of electrochemical impedance spectroscopy to monitor delamination and moisture uptake in CFRP-reinforced concrete structures. / Davis, G. D.; Rich, M. J.; Drzal, L. T.

    Proceedings of the American Society for Composites - 30th Technical Conference, ACS 2015. DEStech Publications, 2015.

    Research output: ResearchConference contribution

    Davis, GD, Rich, MJ & Drzal, LT 2015, Use of electrochemical impedance spectroscopy to monitor delamination and moisture uptake in CFRP-reinforced concrete structures. in Proceedings of the American Society for Composites - 30th Technical Conference, ACS 2015. DEStech Publications, 30th Annual Technical Conference of the American Society for Composites, ASC 2015, East Lansing, United States, 9/28/15.
    Davis GD, Rich MJ, Drzal LT. Use of electrochemical impedance spectroscopy to monitor delamination and moisture uptake in CFRP-reinforced concrete structures. In Proceedings of the American Society for Composites - 30th Technical Conference, ACS 2015. DEStech Publications. 2015.
    Davis, G. D. ; Rich, M. J. ; Drzal, L. T./ Use of electrochemical impedance spectroscopy to monitor delamination and moisture uptake in CFRP-reinforced concrete structures. Proceedings of the American Society for Composites - 30th Technical Conference, ACS 2015. DEStech Publications, 2015.
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