The signal characteristic of radar wave on concrete decks is determined by the attenuation of the radar due to the conversion of EM(Electromagnetic) energy to thermal energy through electrical conduction, dielectric relaxation, scattering, and geometric spreading. In this study, it is found that the attenuation of radar signal received on top rebars in bare deck concrete with 2 way travel time shows a general decreasing linear trend because of its same relative permittivity and conductivity. The radar signal after depth-normalization, can then be interpreted as being principally influenced by the content of chlorides penetrating cover concrete, which caused corrosion of rebars in bridge decks.

1. 서 론
 2. GPR을 이용한 바닥판의 상태평가 개요
  2.1 시스템 구성 및 원리
  2.2 레이더파 감쇠의 영향인자
 3. 레이더 감쇠특성을 고려한 상태평가 방법
  3.1 콘크리트 특성과 감쇠의 관계
  3.2 레이더파의 감쇠특성을 고려한 상태평가 방안 제시
 4. 현장적용
  4.1 건전한 콘크리트 바닥판에서의 레이더파의 감쇠
  4.2 손상된 콘크리트 바닥판에서의 레이더파의 감쇠
  4.3 기존결과와의 비교평가
 5. 결론 및 토의
 References

• 이지영(한국도로공사 책임연구원) | Ji-Young Rhee 교신저자
• 최재진(공주대학교 건설환경공학부 교수) | Jae-Jin Choi
• 김홍삼(한국도로공사 책임연구원) | Hong-Sam Kim
• 박고은(한국도로공사 선임연구원) | Ko-Eun Park
• 최명진(한국도로공사 주임) | Myeong-Jin Choi