| Title |
Detection of Steel Bar Diameter Variation using Nondestructive Surface Measurement Modeling Technique for Steel Corrosion in Concrete |
| Authors |
Rhim Hong-Chul ; Lee Hyung-Woo |
| Keywords |
Corrosion ; Nondestructive test ; Modeling ; Rebar diameter |
| Abstract |
The corrosion state of a reinforcing steel bar in concrete, characterized by the electrical impedance of the interface between the steel bar and the concrete, can be measured indirectly with an array of current and voltage electrodes on the concrete surface. The measured impedance on the concrete surface, however, is a resultant of the interfacial impedance, the measurement geometry, and the concrete material property. To study the effect of rebar diameter variation in the surface-measured impedance a numerical analysis model of Nondestructive Surface Measurement Method for Steel Corrosion in Concrete has been used to simulate the surface impedance responses from several corrosion states as the rebar diameter vary. This simulation confirms that the small variation of the measurement geometry, such as rebar diameter, can be clearly observed in the surface- measured impedance response at the different corrosion state. This study can help to interpret surface- measured data and can also derive the information of the embedded rebar's diameter. |