A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Air-coupled impact-echo imaging of concrete structures
In this paper, work on air-coupled impact-echo is described. The method is applied to locate defects and to determine their depths in concrete. A small (6 mm diameter) measurement microphone is used as the air-coupled sensor. Ambient acoustic noise effects are significantly reduced by a specially-designed sound insulation device. Test results show that air-coupled sensors work as effectively as do contact impact-echo sensors when proper impactors are used. Tests on a concrete slab containing artificial delaminations and voids were carried out, where a 2-D air-coupled impact-echo scan was conducted over the entire slab. The defects are located in a generated 2-D contour image. Experiments show that the areal size of defects can be accurately determined if the scan spacing is smaller than 1/2 of the expected defect size. Air-coupled impact-echo scans were also conducted over a metal duct within concrete. The goal of this experiment is to investigate the grouting condition of the duct. The scan clearly differentiates poorly-grouted sections from the well-grouted section. The studies presented in this paper show the potential of air-coupled impact-echo scanning system for rapid and practical NDT of concrete.
Air-coupled impact-echo imaging of concrete structures
In this paper, work on air-coupled impact-echo is described. The method is applied to locate defects and to determine their depths in concrete. A small (6 mm diameter) measurement microphone is used as the air-coupled sensor. Ambient acoustic noise effects are significantly reduced by a specially-designed sound insulation device. Test results show that air-coupled sensors work as effectively as do contact impact-echo sensors when proper impactors are used. Tests on a concrete slab containing artificial delaminations and voids were carried out, where a 2-D air-coupled impact-echo scan was conducted over the entire slab. The defects are located in a generated 2-D contour image. Experiments show that the areal size of defects can be accurately determined if the scan spacing is smaller than 1/2 of the expected defect size. Air-coupled impact-echo scans were also conducted over a metal duct within concrete. The goal of this experiment is to investigate the grouting condition of the duct. The scan clearly differentiates poorly-grouted sections from the well-grouted section. The studies presented in this paper show the potential of air-coupled impact-echo scanning system for rapid and practical NDT of concrete.
Air-coupled impact-echo imaging of concrete structures
Luftangekoppelte Impaktecho-Abbildung von Betonbauteilen
Zhu, J. (author) / Popovics, J.S. (author)
2006
7 Seiten, 2 Bilder, 7 Quellen
Conference paper
Storage medium
English
Imaging Concrete Structures Using Air-Coupled Impact-Echo
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