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http://dx.doi.org/10.7843/kgs.2018.34.4.27

Application of Electromagnetic Wave for Evaluating Necking Defects in Bored Piles  

Lee, Jong-Sub (School of Civil, Environmental, and Architectural Engrg., Korea Univ.)
Song, Jung Wook (School of Civil, Environmental, and Architectural Engrg., Korea Univ.)
Yu, Jung-Doung (School of Civil, Environmental, and Architectural Engrg., Korea Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.34, no.4, 2018 , pp. 27-35 More about this Journal
Abstract
The objective of this study is to demonstrate the suitability of electromagnetic waves for evaluating necking defects in bored piles using electromagnetic waves. Experiments are conducted with small-scaled defective model pile with diameter of 150 mm and length of 270 mm. Two necking defects are generated at the upper and lower positions on two different sides of the model pile, respectively. The other two necking defects are generated at the upper and lower positions on the same side of the model pile. Electrical wires are installed alongside the stainless steel wire of a steel cage to configure a two-conductor transmission line. A time-domain reflectometer is used to generate and defect electromagnetic waves. The experimental results show that electromagnetic waves are reflected at the necking defects and the end of the model pile. In addition, calculated defect locations are almost the same as actual defect locations. This study demonstrates that electromagnetic waves can be effective tool for evaluating necking defects in bored piles.
Keywords
Electromagnetic wave; Necking defect; Nondestructive evaluation; Time-domain reflectometer; Pile integrity;
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