|
Title |
A Study on the Surface Resistance of Cement-Based Materials for Applying Electrical Resistance Tomography
|
|
DOI |
https://doi.org/10.4334/JKCI.2024.36.4.357 |
|
Keywords |
전기저항토모그래피, 시멘트모르타르, 접촉 임피던스, 비선형 최적화, 이미지 재구성 electrical resistance tomography, cement mortar, contact impedance, nonlinear optimization, image reconstruction |
|
Abstract |
In this study, the influence of contact impedance distribution between electrodes and a specimen on the image reconstruction of Electrical Resistance Tomography (ERT) in cement-based materials was analyzed, and an improved image reconstruction technique considering this effect was proposed. For this purpose, cement mortar specimens were fabricated, and ERT measurements were performed. Based on the measured data and finite element analysis, the contact impedance of each electrode was estimated using a nonlinear optimization technique, and its distribution characteristics were statistically analyzed. The results showed that the contact impedance values of individual electrodes, determined through the nonlinear optimization technique, exhibited deviations within 10% of the mean value. When these derived contact impedances were applied to the ERT image reconstruction, the difference between the maximum and minimum values of the reconstructed image decreased compared to the case where a single value of contact impedance was used. This means that the measurement sensitivity of the electrodes is improved by individually considering the non-uniform contact conditions between the electrodes and the specimen. These findings are expected to contribute to improving the accuracy and reliability of ERT image analysis of cement-based materials.
|