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Title |
An Experimental Study on Estimation of Size and Thickness of Cavitation(Void)s under Concrete Slabs and Tunnel Linings Using Law Frequency Type Radar(GPR)
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Keywords |
Low frequency radar ; Nondestructive inspection ; Concrete ; Pavement slab ; Tunnel lining ; Cavitation ; 저주파수 레이더 ; 비파괴 검사 ; 콘크리트 ; 도로 상판 ; 터널 라이닝 ; 배면 공동 |
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Abstract |
The presence of cavitations under pavements or behind tunnel linings of concrete is likely to result in collapse. One method of detecting such voids by non-destructive means is low frequency type radar(GPR). By the way, the size and thickness of small cavitation can't be detected by the present radar technology with low frequency and low resolution when it apply to civil structures like that. To overcome these problems and limitations, this study aims to develope and propose a new analysis method for estimating the depth, cross-sectional size and thickness of cavitations using low frequency radar. A new proposed method is based on the experiments that are carried out for analyzing the correlation between the measurement values(the amplitudes of radar return) of low frequency radar and various type of cavitations. In this process, the threshold value for radar image processing which aims to represent only cavitations to be fitted size can be obtained. As the results, it is clarified that a proposed method has a possibility of estimating cavitation depth, size and thickness with good accuracy in laboratory scale.
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