Fundamental Study on Electrochemical Impedance Tomography for Concrete Structures

2019 Fiscal Year Final Research Report

• Project/Area Number: 16K14335
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Building structures/Materials
• Research Institution: Ritsumeikan University (2018-2019); Hokkaido University (2016-2017)
• Principal Investigator: FUKUYAMA Tomoko 立命館大学, 理工学部, 准教授 (60587947)
• Project Period (FY): 2016-04-01 – 2020-03-31
• Keywords: インピーダンス / 緩和 / 周波数特性

Outline of Final Research Achievements

Drawing electrochemical tomography of concrete requires surface potential of target. It is essential to determine frequency of input current for measuring surface potentials. In this study, the experiments about relaxation characteristics of cement-based materials were conducted to grasp effect of material conductivity, dielectricity, shape, and electrodes configuration on the frequency distribution. As a result, the optimum measurement frequency of 100 Hz when measuring the surface potential, which is the basis for obtaining electrochemical tomography of concrete, was clarified.

Free Research Field

建築材料

Academic Significance and Societal Importance of the Research Achievements

コンクリートの内部は不可視のため，劣化の初期段階での検出が困難である。コンクリート内部の電気化学的なトモグラフィ情報は空洞や鉄筋の分極抵抗などと相関するため，本研究で検討する技術は鉄筋コンクリート構造物の健全性評価や欠陥検出に資すると考えられる。この技術が実現すれば，安価かつ非破壊で構造物の診断を行うことが可能となり，構造物の長寿命化やライフサイクルコストの低減が期待される。