A new non-contacting non-destructive testing method for defect detection in concrete |
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| Authors: | K Mori A Spagnoli Y Murakami G Kondo I Torigoe |
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| Affiliation: | 1. Department of Mechanical Engineering, Kumamoto University, 2-39-1 Kurokami, Kumamoto, 860-8555 Japan;2. Department of Civil Engineering, University of Parma, Parco Area delle Scienze 181/A, 43100 Parma, Italy;3. Department of Mechanical Science and Engineering, Kyushu University, Fukuoka, Higashi-ku, 812-81 Japan;1. School of Construction Management, Knoy Hall of Technology, Purdue University, 401 N. Grant Street, West Lafayette, IN 47907-2021, United States;2. Department of Civil and Environmental Engineering, Engineering Hall, University of Wisconsin-Madison, 1415 Engineering Drive, Madison, WI 53706, United States;3. Dept. of Building and Real Estate, Faculty of Construction & Environment, The Hong Kong Polytechnic University, ZN716 Block Z Phase 8, Hung Hom, Hong Kong;1. School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China;2. The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China;1. Mechanical Engineering, Sanjivani College of Engineering, Kopargaon, (Affiliated to SPPU Pune), 423601 Kopargaon, India;2. Mechanical Engineering, Bharati Vidyapeeth (Deemed to be University) College of Engineering, Pune 411043, India;1. Railway Technical Research Institute, Kokubunji, Tokyo 185-8540, Japan;2. Department of Urban Management, Kyoto University, Kyoto 615-8540, Japan |
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| Abstract: | A new non-destructive testing (NDT) method for defect detection in concrete structures is presented. The method is based on the dynamic response of flawed concrete structures subjected to impact loading. Conversely to similar NDT techniques, such as the impact-echo method, the present method uses non-contacting devices for both impact generation (a shock tube producing shock waves) and response monitoring (laser vibrometers measuring concrete surface velocity). Experimental and numerical (finite element) studies have been carried out for concrete specimens containing artificial defects (penny-shaped cracks parallel to the free surface) with varying length and depth. According to the experimental and numerical results, it appears that the present method enables an effective detection of defects, particularly in the range of shallow defects. |
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| Keywords: | Concrete Defect detection Impact-echo testing Laser vibrometer Non-destructive testing method Shock wave |
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