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2020 Vol.40, Issue 3 Preview Page

Highway Engineering

A Consideration on the Electromagnetic Properties of Road Pavement Using Ground Penetrating Radar (GPR)

지표투과레이더(GPR)에 의한 도로포장의 전자기적 특성값 고찰

Jiyoung Rhee1
Jaewon Shim2
Sangrae Lee3
Kang-Hyun Lee4*
이 지영1
심 재원2
이 상래3
이 강현4*
1Korea Expressway Corporation Research Institute
2Korea Expressway Corporation Research Institute
3Korea Expressway Corporation Research Institute
4Korea Expressway Corporation Research Institute
1한국도로공사 도로교통연구원 수석연구원
2한국도로공사 도로교통연구원 연구위원
3한국도로공사 도로교통연구원 수석연구원
4한국도로공사 도로교통연구원 수석연구원
* Corresponding Author
June 2020. pp. 285-294
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Abstract

본 연구는 실제 공용 중인 도로에서 약 20년에 걸쳐 지표투과레이더(GPR) 조사하고 도로포장의 전자기적 특성값인 유전상수와 감쇠에 대해 분석하였다. 그 결과로부터 도로포장의 일반적인 특성값 범위, 영향인자, 그리고 보정방법을 제시하였다. 비접촉식(Air-coupled) 1 GHz GPR 안테나로 조사한 아스팔트 포장의 일반적인 유전상수 범위는 4~7이었다. 콘크리트 포장의 경우 초기 재령에서는 유전상수가 매우 큰 값을 보였으나 재령이 경과할수록 급격하게 작아졌다. 재령 10년 이후에는 6~12 범위에 수렴하였다. 공기 중에 노출된 포장의 유전상수는 대기의 상대습도에 따라 증감하였으나 덧씌우기 포장층이 있는 경우 영향성은 1/8 수준으로 감소하였다. 레이더 파의 감쇠는 일반적으로 포장층의 두께가 증가할수록 커지게 되며, 손상 구간에서도 증가하였다. GPR 조사 시 기상조건에 따라서 포장의 전자기적 특성값이 달라질 수 있음을 확인하였으며, 특히 포장상태가 양호한 경우보다 손상이 발달한 상태에서 영향성이 크게 나타났다. 이밖에 동일한 주파수의 GPR 안테나로 조사한 경우에도 장비의 특성이 달라지면 결과값에 차이가 발생할 수 있었다. 따라서 GPR 조사는 도로에 대한 이해를 바탕으로 날씨의 변화가 거의 없고 도로표면이 깨끗한 상태에서 숙련자에 의해 실시하는 것이 필요하다. 또한 보정코어, 장비 보정 등을 통해 해석결과의 신뢰도를 향상하는 것이 요구된다.

키워드
GPR
도로포장
전자기적 특성값
유전상수
감쇠

This study investigated the use of Ground Penetrating Radar (GPR) over a two-decade period on public roads, focusing on the electromagnetic characteristics of the pavement dielectrics and attenuation. From the results, a typical range of characteristic value, influencing factors, and a correction method were suggested. The typical dielectrics of asphalt pavements were 4-7, as measured by an air-coupled 1 GHz GPR antenna. The dielectrics of concrete pavements were very large in the early age, but were drastically reduced with ageing. Ten years on, collection was in the range of 6–12. The dielectrics were proportional to the relative humidity (R.H.) of the atmosphere. The effects were reduced to one eighth with an overlay. Attenuation generally increased with thickness of the road layer, and also increased where there was damage. The GPR results could also vary depending on the weather conditions as well as on the characteristics of the GPR equipment, even at the same frequency. Therefore, GPR surveys should be performed on road surfaces without debris on a single, fine day. The reliability of the GPR analysis could be improved by cores and equipment calibration with other non-destructive test surveys.

Keywords
GPR, Road pavement
Electro-magnetic characteristics
Dielectric constant
Attenuation
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Information
  • Publisher :Korean Society of Civil Engineers
  • Publisher(Ko) :대한토목학회
  • Journal Title :KSCE JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING RESEARCH
  • Journal Title(Ko) :대한토목학회 논문집
  • Volume : 40
  • No :3
  • Pages :285-294
  • Received Date :2019. 11. 12
  • Revised Date :2019. 11. 21
  • DOI :https://doi.org/10.12652/Ksce.2020.40.3.0285
Journal Informaiton Agriculture and Life Sciences Research Institute KSCE JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING RESEARCH
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