19 April 2017 On impedance measurement of reinforced concrete on the surface for estimate of corroded rebar
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In an estimate of health monitoring for reinforced concrete, corrosion degree of rebar is important parameter but is not easy to be estimated by non destructive testing. A few test method such as half cell method or polarization resistance method could be a ’perfect’ nondestructive method if luckily having had wired connection to rebar without destructing target concrete. In this presentation it is reported the experimental result that an impedance measurement on surface of reinforced concretes is able to distinguish corroded rebar from healthy rebar. The contact electrode on concrete surface are simple structure made of urethane sponge and needle. Impedance measurement are carried out with frequency response analyzer with frequency range from 0.01Hz to 1MHz, typical amplitude of imposed voltage are 10 volt. We made concrete specimens under two different corrosion process. One process(pre corrosion) has rebars corroded by electrolysis in salty water before concrete casting and another process (post corrosion) has concrete specimens being corroded during the curing. The results of application of developed method to these corroded specimens show the method is useful to estimate corrosion level of rebars.
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Akira Sasamoto, Akira Sasamoto, Jun Yu, Jun Yu, Yoshihisa Harada, Yoshihisa Harada, Masahiro Iwata, Masahiro Iwata, Kazuhiro Noguchi, Kazuhiro Noguchi, } "On impedance measurement of reinforced concrete on the surface for estimate of corroded rebar", Proc. SPIE 10169, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2017, 101692X (19 April 2017); doi: 10.1117/12.2264948; https://doi.org/10.1117/12.2264948

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