Detection of Misshaped Steel Bars for Reinforced Concrete Structure using Electromagnetic Testing Technique

Abstract

This article proposed a study report of detection of misshaped steel bars for reinforced concrete structure using Electromagnetic testing technique. We herein used a simple rectangular patch antenna as a testing probe. In our experiment, the sample has a dimension of 300 mm x 400 mm x 50 mm, where a steel bar diameter is 3 mm at the depths of 10, 15 and 15 mm. The testing results showed that it can be detected misshaped steel bars by trends of resonant frequency variation. The resonant frequency was significantly varied while bending angle was increased. Our study can be applied for building structure evaluation as technical inspection, in order to prevent unexpected accidents occurred, as well as preventive maintenance.