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説明:

Corrosion of the steel reinforcing bar (Rebar) reduces the strength capacity of concrete structures. Corrosion detection at the early stage of steel rebar is important for the maintenance of concrete structures. Using the eddy current testing method, we developed a portable system to evaluate the corrosion of steel rebar. An AC current was sent to the excitation coil to produce the AC magnetic field and eddy current was induced in the steel rebar. A detection coil was used to detect the signal produced by the eddy current. A lock-in amplifier was used to get the same phase signal and 90-degree phase difference signal and X-Y graph was plotted. From the slope of the X-Y graph, the corrosion of steel rebar or steel wire can be evaluated. In order to optimize the system, we examined the effects of excitation frequency, coil type and coil size on the experimental results. With a specially designed probe, the signal-to-noise ratio and the detection depth were improved.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Steel rebar corrosion evaluation, Eddy current testing

刊行年月日: 2024-12-19

出版者: MDPI AG

掲載誌:

• Standards (ISSN: 23056703) vol. 4 issue. 4 p. 286-299

研究助成金:

• Japan Cross-Ministerial Strategic Innovation Promotion Program (SIP): Construction of Smart Infrastructure Management System

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.3390/standards4040014

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更新時刻: 2026-10-05 09:17:41 +0900

MDRでの公開時刻: 2026-10-05 10:22:09 +0900