n this study, the field test on GPR detection was performed by the various detecting mate-rial in order to evaluate the applicability of the detecting material for GPR detection in maintenance of the restored cavity. The results showed that the applied material was detectable by GPR regardless of type, size and the buried depth of the detecting material. Therefore, it confirmed that the application of the de-tecting material was possible according to the restored method of cavity because the all detecting materi-als can be utilized for the application the GPR detection
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