A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Nondestructive inspection of composite-strengthened concrete structures
Use of fiber-reinforced polymer (FRP) composites to strengthen concrete structures is a relatively new technology. Long term durability is a critical concern. Experience has shown that stringent quality assurance (QA) and nondestructive inspection (NDI) are necessary to ensure the reliability of composite structures. NDI is used to detect defects in a newly fabricated structures that could adversely affect load carrying capability, or that could grow during use. NDI is also used to monitor structures in service to detect degradation, flaw growth and impact damage. Laser shearography and thermography, the subject of this paper, are large-area, non-contact NDI methods, long used for composites, that are particularly well suited for field inspection of concrete structures with fiber-reinforced polymer (FRP) external reinforcement. Shearography also has been applied successfully to find non-visible cracks in unreinforced masonry. In this paper, we demonstrate the ability of shearography and thermography to detect two key types of defects in FRP-reinforced panels using thermal excitation; unbonded areas and impact damage. We also show that shearography can be successfully used with mechanical loading. This is very significant, because it potentially provides a simple way to inspect FRP-reinforced structures in the field. Finally, we recommend future work on NDI and QA.
Nondestructive inspection of composite-strengthened concrete structures
Use of fiber-reinforced polymer (FRP) composites to strengthen concrete structures is a relatively new technology. Long term durability is a critical concern. Experience has shown that stringent quality assurance (QA) and nondestructive inspection (NDI) are necessary to ensure the reliability of composite structures. NDI is used to detect defects in a newly fabricated structures that could adversely affect load carrying capability, or that could grow during use. NDI is also used to monitor structures in service to detect degradation, flaw growth and impact damage. Laser shearography and thermography, the subject of this paper, are large-area, non-contact NDI methods, long used for composites, that are particularly well suited for field inspection of concrete structures with fiber-reinforced polymer (FRP) external reinforcement. Shearography also has been applied successfully to find non-visible cracks in unreinforced masonry. In this paper, we demonstrate the ability of shearography and thermography to detect two key types of defects in FRP-reinforced panels using thermal excitation; unbonded areas and impact damage. We also show that shearography can be successfully used with mechanical loading. This is very significant, because it potentially provides a simple way to inspect FRP-reinforced structures in the field. Finally, we recommend future work on NDI and QA.
Nondestructive inspection of composite-strengthened concrete structures
Zerstörungsfreie Prüfung von verbundwerkstoffverstärkten Betonstrukturen
Newman, J. (author) / Zweben, C. (author)
2002
12 Seiten, 11 Quellen
Conference paper
English
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