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    Fracture and self-sensing characteristics of super-fine stainless wire reinforced reactive powder concrete

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    Publication date
    2020-01
    Author
    Dong, S.
    Dong, X.
    Ashour, Ashraf F.
    Han, B.
    Ou, J.
    Keyword
    Super-fine stainless wire
    Reactive powder concrete
    Fracture toughness
    Fracture energy
    Fracture self-sensing
    Rights
    © 2019 Elsevier Ltd. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license.
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    Super-fine stainless wire (SSW) can not only form widely distributed enhancing, toughening and conductive network in reactive powder concrete (RPC) at low dosage level, but also improve weak interface area and refine cracks due to its micron scale diameter and large specific surface. In addition, the crack resistance zone generated by SSWs and RPC matrix together has potential to further enhance the fracture properties of composites. Therefore, fracture and self-sensing characteristics of SSW reinforced RPC composites were investigated in this paper. Experimental results indicated that adding 1.5 vol. % of SSW leads to 183.1% increase in the initial cracking load of RPC specimens under three-point bending load. Based on two parameter fracture model calculations, an increase of 203.4% in fracture toughness as well as an increase of 113.3% in crack tip opening displacement of the composites reinforced with 1.5% SSWs are achieved. According to double-K fracture model calculations, the initiation fracture toughness and unstable fracture toughness of the composites are enhanced by 185.2% and 179.2%, respectively. The increment for fracture energy of the composites reaches up to 1017.1% because of the emergence of blunt and tortuous cracks. The mixed mode Ⅰ-Ⅱ fracture toughness of the composites is increased by 177.1% under four-point shearing load. The initial angle of mixed mode Ⅰ-Ⅱ cracks of the composites decreases with the increase of SSW content. The initiation and propagation of cracks in the composites can be monitored by their change in electrical resistivity. The excellent fracture toughness of the composites is of great significance for the improvement of structure safety in serviceability limit states, and the self-sensing ability of the composites can also provide early warning for the degradation of structure safety.
    URI
    http://hdl.handle.net/10454/17126
    Version
    Accepted manuscript
    Citation
    Dong S, Dong X, Ashour A et al (2020) Fracture and self-sensing characteristics of super-fine stainless wire reinforced reactive powder concrete. Cement and Concrete Composites. 105: 103427.
    Link to publisher’s version
    https://doi.org/10.1016/j.cemconcomp.2019.103427
    Type
    Article
    Collections
    Engineering and Informatics Publications

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