Journal ArticleDOI
Electrical impedance tomography-based sensing skin for quantitative imaging of damage in concrete
TLDR
In this article, a large-area sensing skin for damage detection in concrete structures is proposed, consisting of a thin layer of electrically conductive copper paint that is applied to the surface of the concrete.Abstract:
This paper outlines the development of a large-area sensing skin for damage detection in concrete structures. The developed sensing skin consists of a thin layer of electrically conductive copper paint that is applied to the surface of the concrete. Cracking of the concrete substrate results in the rupture of the sensing skin, decreasing its electrical conductivity locally. The decrease in conductivity is detected with electrical impedance tomography (EIT) imaging. In previous works, electrically based sensing skins have provided only qualitative information on the damage on the substrate surface. In this paper, we study whether quantitative imaging of the damage is possible. We utilize application-specific models and computational methods in the image reconstruction, including a total variation (TV) prior model for the damage and an approximate correction of the modeling errors caused by the inhomogeneity of the painted sensing skin. The developed damage detection method is tested experimentally by applying the sensing skin to polymeric substrates and a reinforced concrete beam under four-point bending. In all test cases, the EIT-based sensing skin provides quantitative information on cracks and/or other damages on the substrate surface: featuring a very low conductivity in the damage locations, and a reliable indication of the lengths and shapes of the cracks. The results strongly support the applicability of the painted EIT-based sensing skin for damage detection in reinforced concrete elements and other substrates.read more
Citations
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Journal ArticleDOI
Self-sensing concrete enabled by nano-engineered cement–aggregate interfaces
TL;DR: In this paper, a multifunctional cement composite that could not only bear loads but also possessed electromechanical properties that are sensitive to damage was designed, and the objective of the study was to design a composite composite that was robust to damage.
Journal ArticleDOI
Detection of steel fatigue cracks with strain sensing sheets based on large area electronics.
Yao Yao,Branko Glisic +1 more
TL;DR: The results of the tests have validated the general principles of the proposed sensing sheets for crack detection and identified advantages and challenges of the two tested designs.
Journal ArticleDOI
Electrical resistance tomography to monitor unsaturated moisture flow in cementitious materials
TL;DR: In this paper, electrical resistance tomography (ERT) was used to detect the moisture movement and to show approximately the shape and position of the water front even if the flow is non-uniform.
Journal ArticleDOI
A Parametric Level Set Method for Electrical Impedance Tomography
TL;DR: Experimental and simulation results show that PLS method has significant improvement in image quality compared with the TLS reconstruction, and is among the first ones using experimental EIT data.
Journal ArticleDOI
Spatial damage detection in electrically anisotropic fiber-reinforced composites using carbon nanotube networks
TL;DR: In this article, electrical impedance tomography (EIT) and normalized resistance change (NRC) were used to detect localized and site-specific damage in composite laminates.
References
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