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Title |
A Study on the Integrity Assessment of Bare Concrete Bridge Deck based on the Attenuation of Radar Signals
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Authors |
이지영(Ji-Young Rhee) ; 최재진(Jae-Jin Choi) ; 김홍삼(Hong-Sam Kim) ; 박고은(Ko-Eun Park) ; 최명진(Myeong-Jin Choi) |
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DOI |
http://dx.doi.org/10.11112/jksmi.2016.20.4.084 |
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Keywords |
Radar ; Attenuation ; Concrete ; Deck ; Normalization |
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Abstract |
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.
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