3D Inversion of DCR Data for Structural Column Analysis in Buildings

Geophysical methods have long been utilized for non-destructive testing of concrete structures, focusing on key techniques such as Ground Penetrating Radar (GPR), Direct Current Resistivity (DCR), and Seismic Methods (ultrasonic seismic). These methods assess factors like the condition of reinforcement bars, internal discontinuities, structural strength, and corrosion in concrete. In particular, DCR data, often collected with the Wenner array for fixed electrode distance, directly evaluates concrete corrosion through apparent resistivity. While some laboratory-scale resistivity tomography studies exist, this study introduces a novel measurement setup designed for multi-electrode and multi-channel DCR instruments. The setup enables data collection using different electrode arrays on building columns' single, adjacent, and opposite surfaces. We analyzed and compared the 3D inversion results obtained from synthetic and experimental data using various measurement setups and electrode arrays. This presentation will highlight the comparative results and insights gained from these configurations.

Acknowledgment: This study was supported by the Scientific and Technological Research Council of Türkiye (TÜBİTAK) under project ID 121Y281. We extend our sincere gratitude to TÜBİTAK for their valuable support.