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Different Characteristics of Radar Signal Attenuation Depending on Concrete Condition of Bare Bridge Deck

  • Highway Engineering
  • Published:
KSCE Journal of Civil Engineering Aims and scope

Abstract

This paper examined the attenuation method, which is used abroad, to derive a method to evaluate the condition of bare concrete bridge decks using ground penetrating radar (GPR) technology. For this purpose, 12 GPR surveys of 10 bridge decks in public service from the beginning of its service to 25 years of service were carried out to examine the attenuation characteristics of GPR signals under various concrete conditions. The survey revealed the signal below the top rebar of concrete bridge deck under the condition of using de-icing chlorides for snow removal was not clear. Therefore, using the receiving wave signal from top rebar was reasonable when attenuation of GPR signal was to be used for bridge deck evaluation. Examining the signal attenuation by the condition of concrete, dispersion of the attenuated signal was overall large in the initial performance period. However, since this is not due to deterioration, exclusion of the large dispersion from the evaluation of bridge deck condition was desirable. The attenuation size was linearly proportional to its two way travel time (signal transmission time), i.e., the depth of the top rebar, in a sound bridge deck. Also, the dispersion of the attenuation was small and symmetric to the linear regression line. If the bridge deck was maintained adequately, the linear regression correlation was also maintained similarly for the next several years. However, if deterioration occurred to be accompanied by increased attenuation and dispersion, correlation coefficient of the linear regression line declined. Nonetheless, the upper value of the attenuation representing sound concrete condition was still tended to be linearly proportional to two way travel time. Since the attenuation quantity could result in considerable debilitation just by the construction error, it is necessary to deal with the depth-error of top rebar for evaluating the concrete condition by using the GPR signal attenuation. Calibration was carried out by deriving a linear regression line for the signal two way travel time and the upper 90th percentile values of the attenuation obtained from the top bar position of the bridge and then removing it from the total attenuation.

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Authors and Affiliations

  1. Member, Korea Expressway Corporation Research Institute, Hwaseong, 18489, Korea

    Ji-Young Rhee & Jaewon Shim

  2. Dept. of Architectural Engineering, Dong-A University, Busan, 49315, Korea

    Seong-Hoon Kee

  3. Dept. of Construction and Safety Engineering, Induk University, Seoul, 01878, Korea

    Sang-Yum Lee

Authors
  1. Ji-Young Rhee
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  2. Jaewon Shim
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  3. Seong-Hoon Kee
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  4. Sang-Yum Lee
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Correspondence to Sang-Yum Lee.

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Rhee, JY., Shim, J., Kee, SH. et al. Different Characteristics of Radar Signal Attenuation Depending on Concrete Condition of Bare Bridge Deck. KSCE J Civ Eng 24, 2049–2062 (2020). https://doi.org/10.1007/s12205-020-1840-1

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  • DOI: https://doi.org/10.1007/s12205-020-1840-1

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