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Electromagnetic testing to evaluate the condition of reinforcement bars
Electromagnetic testing to evaluate the condition of reinforcement bars
Electromagnetic testing, also known as electromagnetic inspection or electromagnetic evaluation, is a non-destructive testing (NDT) method that uses electromagnetic induction to detect changes in the electrical conductivity of a material. This method is commonly used to evaluate the condition of reinforcement bars (rebars) in reinforced concrete structures.
In electromagnetic testing, a transmitter coil is placed near the surface of the concrete and generates a magnetic field. This field creates eddy currents in the reinforcement bars, which generate their own magnetic field. The receiver coil, also placed near the surface of the concrete, measures the strength and phase of the magnetic field created by the eddy currents.
Changes in the electrical conductivity of the reinforcement bars, such as those caused by corrosion or other defects, will affect the strength and phase of the magnetic field, which can be detected by the receiver coil. The resulting data can be used to evaluate the condition of the reinforcement bars and identify potential issues.
Electromagnetic testing is a fast and efficient method for evaluating the condition of reinforcement bars in concrete, and it can be performed on both new and existing structures. It is important to note, however, that this method is not always 100% accurate, and it may not be able to detect all types of defects or abnormalities in the reinforcement. In some cases, it may be necessary to use other methods, such as visual inspection or cutting into the concrete, to obtain a complete assessment of the reinforcement.
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