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A platform for research: civil engineering, architecture and urbanism
Corrosion mechanisms in reinforced concrete by acoustic emission
Highlights ► We have identified two periods at the onset of corrosion in rebar and the nucleation of corrosion-induced cracks in concrete. ► Quantitative information on locations and kinematics of cracks is inherently necessary for diagnosis of concrete structures. ► This research aims at a hybrid NDE of AE and electrochemical methods for on-site monitoring of corrosion damages in concrete.
Abstract Continuous acoustic emission (AE) monitoring is applied to a cyclic wet and dry test of reinforced concrete beams. The onset of corrosion and the nucleation of corrosion-induced cracks in concrete are successfully identified, and then, cross-sections inside the concrete specimen are observed by an electron probe micro analyzer (EPMA). Results of AE parameter analysis are compared with the corrosion mechanisms observed by EPMA. Further, a relation between kinematical information of AE sources and nucleation of micro-cracks inside is identified by the SiGMA analysis and observed by the stereo-microscope. From these results, AE is a promising technique to quantitatively evaluate the corrosion process in concrete due to expansion of corrosion products at an early stage is demonstrated.
Corrosion mechanisms in reinforced concrete by acoustic emission
Highlights ► We have identified two periods at the onset of corrosion in rebar and the nucleation of corrosion-induced cracks in concrete. ► Quantitative information on locations and kinematics of cracks is inherently necessary for diagnosis of concrete structures. ► This research aims at a hybrid NDE of AE and electrochemical methods for on-site monitoring of corrosion damages in concrete.
Abstract Continuous acoustic emission (AE) monitoring is applied to a cyclic wet and dry test of reinforced concrete beams. The onset of corrosion and the nucleation of corrosion-induced cracks in concrete are successfully identified, and then, cross-sections inside the concrete specimen are observed by an electron probe micro analyzer (EPMA). Results of AE parameter analysis are compared with the corrosion mechanisms observed by EPMA. Further, a relation between kinematical information of AE sources and nucleation of micro-cracks inside is identified by the SiGMA analysis and observed by the stereo-microscope. From these results, AE is a promising technique to quantitatively evaluate the corrosion process in concrete due to expansion of corrosion products at an early stage is demonstrated.
Corrosion mechanisms in reinforced concrete by acoustic emission
Kawasaki, Yuma (author) / Wakuda, Tomoyo (author) / Kobarai, Tomoe (author) / Ohtsu, Masayasu (author)
Construction and Building Materials ; 48 ; 1240-1247
2013-01-01
8 pages
Article (Journal)
Electronic Resource
English
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