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Title |
Development of a Cover Depth Estimation Technique for Precast Concrete Poles Using Ground Penetrating Radar
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Authors |
이태민(Taemin Lee) ; 김영근(Young-Gun Kim) ; 최하진(Hajin Choi) |
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DOI |
https://doi.org/10.4334/JKCI.2026.38.4.425 |
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Keywords |
PC 전주; 비파괴 검사; 품질검사; 지표투과레이더; 피복두께 PC pole; non-destructive test; quality control; ground penetrating radar; cover depth |
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Abstract |
This study proposes an algorithm for estimating rebar cover depths using ground-penetrating radar (GPR) for use during quality inspections of pretensioned centrifugal-type prestressed concrete (PC) poles. The accuracy and applicability of the proposed method were experimentally verified using actual PC pole specimens. Conventional destructive testing methods face limitations in terms of representativeness and structural damage, making it difficult to perform a quantitative quality assessment across the entire pole length. They are also known for low efficiency. In this study, a signal-processing technique combined with the synthetic aperture focusing technique (SAFT) was used to reconstruct signals reflected from internal rebars, after which the signals were analyzed to determine the cover depth. Two different types of PC poles were tested, and a total of nine repeated measurements per specimen confirmed high accuracy within an error range of 0.27 mm to 2.4 mm. In addition, the method demonstrated its potential to evaluate structural characteristics such as variations in rebar spacing distances and cover depths. This study presents a non-destructive quality evaluation approach capable of offsetting the limitations of KS F 4304-based destructive testing and provides a quantitative basis for objective cover depth assessments using GPR.
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