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Determining the Optimal Frequency of Ground Penetrating Radar for Detecting Voids in Pavements
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 Title & Authors
Determining the Optimal Frequency of Ground Penetrating Radar for Detecting Voids in Pavements
Kim, Yeon Tae; Kim, Booil; Kim, Je Won; Park, Hee Mun; Yoon, Jin Sung;
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 Abstract
PURPOSES : The objective of this study is to determine the optimal frequency of ground penetrating radar (GPR) testing for detecting the voids under the pavement. METHODS : In order to determine the optimal frequency of GPR testing for void detection, a full-scale test section was constructed to simulate the actual size of voids under the pavement. Voids of various sizes were created by inserting styrofoam at varying depths under the pavement. Subsequently, 250-, 500-, and 800-MHz ground-coupled GPR testing was conducted in the test section and the resulting GPR signals were recorded. The change in the amplitude of these signals was evaluated by varying the GPR frequency, void size, and void depth. The optimum frequency was determined from the amplitude of the signals. RESULTS: The capacity of GPR to detect voids under the pavement was evaluated by using three different ground-coupled GPR frequencies. In the case of the B-scan GPR data, a parabolic shape occurred in the vicinity of the voids. The maximum GPR amplitude in the A-scan data was used to quantitatively determine the void-detection capacity. CONCLUSIONS: The 250-MHz GPR testing enabled the detection of 10 out of 12 simulated voids, whereas the 500-MHz testing allowed the detection of only five. Furthermore, the amplitude of GPR detection associated with 250-MHz testing is significantly higher than that of 500-MHz testing. This indicates that 250-MHz GPR testing is well-suited for the detection of voids located at depths ranging from 0.5~2.0 m. Testing at frequencies lower than 250 MHz is recommended for void detection at depths greater than 2 m.
 Keywords
ground penetrating radar;testbed;asphalt pavement;simulated void;amplitude;
 Language
Korean
 Cited by
1.
도로함몰 위험도 평가를 위한 실대형 포장가속시험 기초 연구,박희문;김연태;최지영;김기현;

한국도로학회논문집, 2016. vol.18. 5, pp.57-62 crossref(new window)
2.
도로동공 탐지를 위한 지표투과레이더의 신호패턴에 관한 연구,윤진성;백종은;최연우;최현;이창민;

한국도로학회논문집, 2016. vol.18. 6, pp.61-67 crossref(new window)
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