Nondestructive Method to Detect Corrosion of Steel Elements in Concrete

Abstract

This report provides an outline of a novel approach, methodology, and equipment needed to detect corrosion of any steel element that is embedded in the concrete bridges. Further, within this project, a complete non-destructive system is developed that can detect the presence and extent of corrosion in any steel elements in concrete bridges. The method is specifically developed for post tension concrete bridges, which is the most challenging condition. The foundation of the method is based on a simple concept in physics called the Hall effect. The principle is based on creating a magnetic field around the embedded steel element and studying the resulting magnetic field changes using Hall-effect sensors. The idea is that the magnetic field will change in the presence of corrosion. Corrosion of steel reinforcing bars or strands in concrete bridges presents a great challenge for inspection and safety evaluation of these structures. The non-destructive equipment and associated methodology developed in this project allows effective and rapid assessment of bridges for the presence of corrosion.