Effect of multiwalled carbon nanotubes on compressive behavior of concrete at elevated temperature for mass concreting

Kashan Nisar, Muhammad Shahid Siddique, Muhammad Rizwan, Syed Hassan Farooq, Muhammad Usman*, Asad Hanif*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In this article, CNTs have been used in concrete, and the resulting properties are evaluated. Also, the CNT-reinforced concrete was exposed to elevated temperature, and the corresponding change in mechanical performance was investigated. Mechanical properties were studied, such as compressive and flexural strengths, stress-strain response, elastic modulus, compressive toughness, mass loss, and deterioration caused by exposure to elevated temperatures. Concrete specimens were heated to 200, 400, 600, and 800 °C at a heating rate of 5 °C/min and then tested for residual properties. CNT-reinforced concrete showed a higher compressive strength, elastic modulus, flexural strength, and compressive toughness than the control specimens. 0.15-CNT reinforced samples showed an increase of nearly 33% in Compressive strength and 50% in flexural strength. From the visual inspection, CNT-reinforced specimens showed less cracking at higher temperatures. Moreover, the effect of plastering concrete with CNTs was studied, which depicted better strength retention on exposure to fire. At 600 °C, 0.3 P-CNT plaster samples retained up to 43% of compressive strength and 46% of flexural strength, whereas control samples only retained up to 29% and 34% of their original strengths, respectively. Thus, it can be concluded that CNTs utilization in concrete is efficient for improved concrete fire resistance.

Original languageEnglish
Pages (from-to)4664-4687
Number of pages24
JournalEuropean Journal of Environmental and Civil Engineering
Volume27
Issue number16
DOIs
StatePublished - 2023

Bibliographical note

Publisher Copyright:
© 2023 Informa UK Limited, trading as Taylor & Francis Group.

Keywords

  • Carbon-nanotubes
  • concrete
  • elevated temperature
  • properties degradation
  • properties retention

ASJC Scopus subject areas

  • Environmental Engineering
  • Civil and Structural Engineering

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