3D Impedance Mapping of Internal Concrete Block by using Multichannel Wire Grid

Monitoring method to evaluate the corrosion environment for reinforced steel inside the concrete structure was investigated using impedance mapping technique. In this method many iron wires were embedded in a test concrete block in parallel or grid alignments and impedance between two iron wires sequentially chosen from the grid was measured to obtain the conduction (resistance) map inside the concrete block. From the resultant conduction map, corrosion environment for steel inside the concrete such as penetration of water or salt can be speculated.