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Title |
A Study on the Reliability of Detecting Reinforcement Embedded in Concrete in Various Factors Using Electromagnetic Induction Method and Electromagnetic Wave Method
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Keywords |
Cover depth ; Electromagnetic induction method ; Electromagnetic wave method ; Reinforcement ; 피복두께 ; 전자기유도법 ; 전자파레이더법 ; 철근 |
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Abstract |
Probing inside of concrete structures is one of the important steps in assessing condition of the structure. For the assessment, electromagnetic induction method and electromagnetic wave method are currently applied to the measurement of cover depth, and the detection of reinforcement embedded in concrete. To determine detection capability of locating reinforcement embedded in concrete, commercially available nondestructive testing (NDT) equipments have been tested. The equipments include electromagnetic wave system and electromagnetic induction system. In the tests, nine concrete specimens which have the dimensions of 1,000㎜(length)×300㎜(width) with thickness varying from 125㎜ to 150㎜ are used. The reinforcement are located at 45, 60, 100㎜ depth from the concrete surface. Horizontal reinforcement spacing has been set over 100㎜. From the outcome, it is shown that error is increased as the diameter of reinforcement enlarge in case of using electromagnetic induction method. In case of using electromagnetic wave method, the detection of reinforcement embedded in deep is good in the view of reliability because of using the relative permittivity on the real cover depth.
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