Magnetic resonance eddy penetrating imaging for detecting reinforcement corrosion in concrete.

Reinforcement corrosion is a popular hidden disease in concrete constructions and seriously threats to the structure safety, but effectively detecting it has still been challenging for its hidden nature. This work proposes a new principle of internal reinforcement corrosion detection: magnetic resonance eddy penetrating imaging (MREPI), which shows a large eddy detection depth because of resonance enhancement. Theoretical and experimental results demonstrate the effectiveness of MREPI for imaging internal steel reinforcement. A scanning MREPI system for reinforcement testing is built and the specific images of reinforcement corrosion under up to 50 mm concrete are successfully obtained in this work. The position, orientation and diameter of reinforcement all can be determined. Importantly, by analyzing MREPI data, corrosion depth and width of the reinforcement can be quantitively characterized. These results present an innovative approach for non-destructively testing reinforcement corrosion in concrete constructions. • Develepe a penestrating imaging system based on magnetic resonance enhanced eddy effect. • Fine imaging of reinforcement and reinforcement corrosion under at least 50 mm thick layer of concrete. • Quantitively estimate locaton, diameter, corrosion depth and corrosion width of reinforcement under concrete. [ABSTRACT FROM AUTHOR]