Ground-Penetrating Radar for Detection of an anomaly in masonry brick structures

Abstract

This paper presents the ground-penetrating radar result documentation and discussion for the anomaly detection inside masonry brick structures. The masonry brick samples of 0.90x0.90x0.30 m have been prepared for the experimental setup. To analyze the irregularity, the different types of the anomaly, which are wire mesh, chicken wire mesh, PVC pipe, steel pipe, timber, and void, are installed in the stack masonry samples. The brick experiments have done for both dry and wet conditions. The GPR scanning data has been processed thoroughly by software with various dielectric constants, the electrical property of the materials, to identify the radar signal from the image scan. In addition to the effect of moisture on GPR detection is also investigated and reported. By comparing the radar signals with identical materials in the masonry structure, it was found that the dielectric constant in the dry brick at the precise point is in the range of 4.0, and the wet brick condition is greater than 12.0 from the overall scale. The obtained results benefit the Thai historical structure preservation by using as a guideline for anomaly detection in the ancient brick structures.