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Studying the Incorporation of Multi-Walled Carbon Nanotubes in High-Performance Concrete

Author

Listed:
  • Esequiel Mesquita

    (Laboratory of Rehabilitation and Building Durability (LAREB), Federal University of Ceará, Campus of Russas, Russas 62900-000, Brazil)

  • Ana Mafalda Matos

    (CONSTRUCT-Labest, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal)

  • Israel Sousa

    (Laboratory of Rehabilitation and Building Durability (LAREB), Federal University of Ceará, Campus of Russas, Russas 62900-000, Brazil)

  • Mylene Vieira

    (Laboratory of Rehabilitation and Building Durability (LAREB), Federal University of Ceará, Campus of Russas, Russas 62900-000, Brazil)

  • Luís P. M. Santos

    (Graduate Program in Materials Science and Engineering, Center of Technology, Federal University of Ceará, Campus of PICI, Fortaleza 60440-000, Brazil)

Abstract

The current work aimed to study nanomodified HPC with multi-walled carbon nanotubes (MWCNT). The effect of MWCNT concentration, from 0% to 0.6% of cement weight, was evaluated on HPC multi-level output properties, namely, the flowability, mechanical strength, electrical resistivity, and microstructure. In addition, a tentative, simplified, and more cost-effective method based on dispersion of a high-pH solution of hydroxide was also adapted to disperse the MWCNT before incorporation in fresh HPC mixtures. Adding 0.2–0.6% MWCNT reduced HPC workability even with a higher superplasticiser dosage. The electrical resistivity was 484.58 Ω m for the HPC without MWCNT at 28 days of curing, while the samples with 0.2%, 0.4%, and 0.6% MWCNT presented 341.41 Ω m, 363.44 Ω m, and 360.34 Ω m, respectively. The use of 0.2–0.6% MWCNT in HPC decreased the flexural and compressive strength by 20% and 30%, respectively. The HPC performance decrease with MWCNT seemed to be related to relatively significant agglomerations of the long MWCNTs, namely, in HPC-0.6% samples. New developments are needed to state a simple and cost-effective dispersion method for MWCNT incorporation in HPC. In addition, smaller dosages of MWCNT are suggested for future research works.

Suggested Citation

  • Esequiel Mesquita & Ana Mafalda Matos & Israel Sousa & Mylene Vieira & Luís P. M. Santos, 2023. "Studying the Incorporation of Multi-Walled Carbon Nanotubes in High-Performance Concrete," Sustainability, MDPI, vol. 15(17), pages 1-15, August.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:17:p:12958-:d:1227014
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    References listed on IDEAS

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    1. D'Alessandro, Antonella & Pisello, Anna Laura & Fabiani, Claudia & Ubertini, Filippo & Cabeza, Luisa F. & Cotana, Franco, 2018. "Multifunctional smart concretes with novel phase change materials: Mechanical and thermo-energy investigation," Applied Energy, Elsevier, vol. 212(C), pages 1448-1461.
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