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    Investigating the compatibility of nickel coated carbon nanotubes and cementitious composites through experimental evidence and theoretical calculations

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    Publication date
    2021-09
    End of Embargo
    2022-07-28
    Author
    Wang, D.
    Dong, S.
    Wang, X.
    Ashour, Ashraf F.
    Lv, X.
    Han, B.
    Keyword
    Cementitious composites
    Nickel coated multi-walled carbon nanotubes
    Mechanical properties
    Aspect ratio
    Water to cement ratio
    Rights
    © 2021 Elsevier Ltd. All rights reserved. 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
    Open Access status
    Green
    
    Metadata
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    Abstract
    Nickel coated multi-walled carbon nanotubes (NiMCNTs) are favorable reinforcing nanofillers for modifying cementitious composites due to their preeminent mechanical properties, electrical conductivity, thermal properties and dispersibility. This paper investigates the mechanical properties and compatibility of NiMCNTs filled cementitious composites, having two different types of cement, two water to cement ratios, and two dosages of five types of NiMCNTs. The results show that 0.06 vol.% NiMCNTs with small aspect ratios can significantly enhance the mechanical properties of cementitious composites, while NiMCNTs with large aspect ratios play a better strengthening effect at 0.03 vol.%. The flexural strength/toughness of cementitious composites containing 0.06 vol.% NiMCNTs with an aspect ratio of 200 can be increased by 19.65%/116.78%. Adding 0.03 vol.% NiMCNTs with an aspect ratio of 1000 enhances the compressive strength/toughness of composites by 18.61%/47.44%. Besides, NiMCNTs have preferable compatibility to cementitious composites prepared by P·O 42.5R cement with a water to cement ratio of 0.3. The enhancement mechanism is related to the denser microstructure and effective suppression of microcracks in the cementitious matrix by NiMCNTs with filling, bridging and pull-out effects, as well as the high interface bond strength between NiMCNTs and matrix. A strength prediction model for NiMCNTs reinforced cementitious composites is also established to estimate the mechanical strength of cementitious composites containing NiMCNTs with different aspect ratios/contents, showing a small relative error within ±6%/±13% for predicted flexural/compressive strength values in comparison with the experimental results.
    URI
    http://hdl.handle.net/10454/18571
    Version
    Accepted manuscript
    Citation
    Wang D, Dong S, Wang X et al (2021) Investigating the compatibility of nickel coated carbon nanotubes and cementitious composites through experimental evidence and theoretical calculations. Construction and Building Materials. 300: 124340.
    Link to publisher’s version
    https://doi.org/10.1016/j.conbuildmat.2021.124340
    Type
    Article
    Notes
    The full-text of this article will be released for public view at the end of the publisher embargo on 28 July 2022.
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