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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Spatial Imaging of Cracks in Fiber Reinforced Cementitious Composites by EIT
Author(s): T.-C. Hou and J.P. Lynch
Publication: Special Publication
Appears on pages(s): 53-72
Keywords: damage detection; electrical impedance tomography; engineered cementitious composites; structural health monitoring
Abstract:Cementitious materials are generally classified as semi-conductors that are capable of carrying electricity when an external electrical signal is applied. The electrical properties of cementitious materials have been widely explored for monitoring their internal hydration processes. However, comparatively less work has been done in using the inherent electrical properties of cementitious materials for structural health monitoring. In this study, the electrical properties of a unique strain-hardening fiber reinforced cementitious composite termed Engineered Cementitious Composite (ECC) are utilized for monitoring the performance and health of ECC structural components. Previous work has utilized two- and four-point probe techniques for measuring ECC bulk conductivity and illustrating the piezoresistive properties of the material. This work introduces electrical impedance tomography (EIT) as a powerful sensing methodology that measures the spatial distribution of conductivity over large areas of ECC elements. With a tomographic mapping of ECC conductivity, the distribution of strain fields and cracks in ECC elements can be observed in incredible visual detail.
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