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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: Carbon Black Engineered Cementitious Composites - Mechanical and Electrical Characterization
Author(s): Mo Li, Vincent W. J. Lin, Jerome P. Lynch and Victor C. Li
Publication: Special Publication
Appears on pages(s): 1-16
Keywords: damage detection, electrical impedance, engineered cementitious composite, structural health monitoring.
Abstract:The protection and health monitoring of deteriorating concrete infrastructure requires a new generation of self-sensing structural materials that possess intrinsic damage tolerance but offer self-sensing capabilities that are tailored to diagnose states of cracking. Engineered Cementitious Composites (ECC) doped with carbon black (CB) nano-particles are proposed as highly damage-tolerant materials whose electrical properties can be correlated to strain and cracking. This study investigated the effect of CB dosage on the CB-ECC rheological, mechanical and electrical properties. By incorporating CB nano-particles into the ECC system while simultaneously controlling the rheological properties of the fresh mix, the fully cured CB-ECC elements achieved close-to-uniform PVA fiber and carbon black dispersion, reduced bulk resistivity by an order of magnitude, strain hardening behavior with tensile strain capacity of 0.26 to 1.38%, and reduced crack widths of 30 to 40 m during tensile loading. Furthermore, all of the CB-ECC specimens exhibited prominent piezoresistive behavior with resistivity increasing in tandem with applied tensile strain, thereby indicating the potential of CB-ECC for strain and damage sensing.
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