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Title |
Evaluating the Depth of a Surface-opening Crack in Concrete Slabs using Surface wave Measurements
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DOI |
http://dx.doi.org/10.11112/jksmi.2015.19.3.104 |
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Keywords |
표면균열 ; 비접촉 ; 표면파 측정 ; 콘크리트 슬래브 ; 비파괴검사 Surface-opening crack ; Non-contact ; Surface wave measurement ; Concrete slab ; Nondestructive evaluation |
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Abstract |
Non-contact surface wave transmission (SWT) measurements are used to evaluate the depth of a surface-breaking crack in concrete slabs. The author propose a measurement model that includes an appropriate configuration of the source and receivers, and a transmission function for the given configuration. A series of numerical simulations using a 3D finite element model is used to obtain the transmission function. Then, validity of a proposed model is verified through experimental studies. Two air-coupled sensors are used to measured surface waves across surface-breaking cracks with varying depths from 0mm to 100mm with intervals of 10mm in a concrete slab (1500×1500×180mmin laboratory. As a result, the proposed method is demonstrated as to be effective for charactering the depth of a surface-breaking crack in concrete bridge deck with an average error of 10%. A discussion on practical applications of the proposed method is also included in this article.
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