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ORIGINAL RESEARCH article

Front. Mater.
Sec. Structural Materials
Volume 11 - 2024 | doi: 10.3389/fmats.2024.1500823
This article is part of the Research Topic Advanced Materials and Technologies for Sustainable Development of Underground Resources View all 20 articles

Study on strengthening mechanism of cement-based materials reinforced by CNTs by coating method

Provisionally accepted
Ao Wang Ao Wang 1,2,3Chengjun Hu Chengjun Hu 1,2*Gang Song Gang Song 2Baofu Zhao Baofu Zhao 2Hongwen Jing Hongwen Jing 4Bo Meng Bo Meng 4Zixuan Yu Zixuan Yu 4
  • 1 School of Energy and Mining Engineering，China University of Mining and Technology, Beijing, China, Beijing, China
  • 2 China Coal (Tianjin) Underground Engineering Intelligent Research Institute Co., Ltd., Tianjin, China
  • 3 School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, China, Xuzhou, Jiangsu Province, China
  • 4 State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Earth Engineering, Xuzhou, China

The final, formatted version of the article will be published soon.

    Carbon nanotubes (CNTs) modified cement provides a new way to develop high performance cement-based grouting materials. However, the time and energy consumption of CNTs dispersion and the problems of reaggregation further limit its application in engineering. Therefore, a novel dispersion method for CNTs was proposed in this paper. The proposed coating dispersion method not only achieved a good dispersion of CNTs on the surface of fly ash (FA), but also reduced the structural damage of CNTs during the dispersion process. At the same time, a strong covalent bond was formed between CNTs and FA, which effectively alleviated the reagglomeration problem of CNTs. Secondly, the workability and mechanical properties of cement-based grouting materials reinforced by CNTs coated with FA were studied through laboratory tests. The test results showed that compared with ordinary cement slurry, the fluidity and compressive strength were increased by 3.5-11.6% and 2.09 ~32.87% after replacing part of cement with FA coated with CNTs. Finally, the mechanism of CNTs' influence on the microstructure of the grouting material was studied through the micro-characterization test. The results showed that CNTs coated on the FA surface produced nucleation effect and played a bridging role, promoted hydration reaction and improved the cement-FA interface transition zone (ITZ). In addition, CNTs coating FA effectively improved the energy absorption effect of the cement matrix, resulting in changes in the micro-roughness of the fracture surface of the sample.

    Keywords: Carbon nanotubes, Cement grouting materials, nanomodification, Engineering properties, Preparation optimization

    Received: 24 Sep 2024; Accepted: 02 Dec 2024.

    Copyright: © 2024 Wang, Hu, Song, Zhao, Jing, Meng and Yu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Chengjun Hu, School of Energy and Mining Engineering，China University of Mining and Technology, Beijing, China, Beijing, China

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.