Zairyo-to-Kankyo
Online ISSN : 1881-9664
Print ISSN : 0917-0480
ISSN-L : 0917-0480
Volume 66 , Issue 9
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Commentary
Technical Report
Research Paper
  • Hiroyuki Tokieda, Tatsuki Okamoto, Yoshinao Hoshi, Isao Shitanda, Masa ...
    2017 Volume 66 Issue 9 Pages 299-304
    Published: September 15, 2017
    Released: April 25, 2018
    JOURNALS FREE ACCESS

    We developed a probe electrode for impedance measurement to investigate of rebar corrosion in concrete. Impedance measurements of the electrode in an aqueous solution simulating the transition zone of concrete and rebar interface were carried out. The charge transfer resistance Rct obtained from the two point frequency measurement results by the method developed by Haruyama and Tsuru almost agreed with Rct estimated by spectral measurement. It was also confirmed that Rct was drastically decreased by de-passivation following the decrease in pH. Furthermore, impedance measurement of the probe electrode in concrete specimen was carried out.It was confirmed that Rct was small when the depth of setting the probe electrode was shallow. It was concluded that the state of the rebar/concrete interface can be evaluated by Rct of the probe electrode installed in the concrete.

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