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    Interfacial characteristics of nano-engineered concrete composites

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    Ashour_Construction_and_Building_Materials.pdf (2.508Mb)
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    Publication date
    2020-10
    Author
    Wang, X.
    Zheng, Q.
    Dong, S.
    Ashour, Ashraf F.
    Han, B.
    Keyword
    Concrete
    Interfacial transition zone
    Nanofillers
    Bond strength
    Microstructures
    Compositions
    Rights
    © 2020 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
    
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    Abstract
    This study investigates the interfacial characteristics between aggregates and cement paste matrix in nanofillers modified concrete. A three-point bend test on the specimens composed of two pieces of aggregates bonded with a thin layer of cement pastes with/without nanofillers was carried out to characterize the interfacial bond strength of the composites. The scanning electron microscope observations and energy dispersive x-ray spectrometry analysis were also performed to characterize the interfacial microstructures and compositions of the composites. The experimental results indicated that the nanocomposites have higher interfacial bond strength and narrower interfacial transition zone thickness as well as more optimized intrinsic compositions and microstructures than that of composites without nanofillers. Specifically, the interfacial bond strength of nanocomposites can reach 7.67 MPa, which is 3.03 MPa/65.3% higher than that of composites without nanofillers. The interfacial transition zone thickness of nanocomposites ranges from 9 μm to 12 μm, while that of composites without nanofillers is about 18 μm. The ratio of CaO to SiO2 in the interface of composites without nanofillers is 0.69, and that of nanocomposites increases to 0.75–1.12. Meanwhile, the nanofiller content in nanocomposite interface is 1.65–1.98 times more than that in the bulk matrix. The interfacial microstructures of nanocomposites are more compact and the content and crystal size of calcium hydroxide were significantly reduced compared with that of composites without nanofillers.
    URI
    http://hdl.handle.net/10454/17954
    Version
    Accepted manuscript
    Citation
    Wang X, Zheng Q, Dong S et al (2020) Interfacial characteristics of nano-engineered concrete composites. Construction and Building Materials. 259: 119803.
    Link to publisher’s version
    https://doi.org/10.1016/j.conbuildmat.2020.119803
    Type
    Article
    Collections
    Engineering and Informatics Publications

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