Mechanical and microstructural properties of cement pastes containing carbon nanotubes and carbon nanotube-silica core-shell structures, exposed to elevated temperature

Pawel Sikora, Mohamed Abd Elrahman, Sang Yeop Chung, Krzysztof Cendrowski, Ewa Mijowska, Dietmar Stephan

Research output: Contribution to journalArticlepeer-review

94 Citations (Scopus)

Abstract

This study aims to investigate the effects of carbon nanotubes and carbon nanotube-silica core-shell structures, on the behaviour of cement pastes exposed to high temperature (300, 450 and 600 °C). Pristine multi-walled carbon nanotubes (MWCNTs) were coated with a solid nanosilica (NS) shell, to form a core-shell nanostructure (MWCNT/NS). The cement pastes were incorporated with three different nanomaterial contents equal to 0.125, 0.25 and 0.5 wt.-% of cement. The results demonstrate that incorporation of an optimum amount (0.125 wt.-%) of MWCNT/NSs, is much more beneficial than the incorporation of MWCNTs, for improving the properties of unheated and heated cement pastes. Silica shell improves the binding ability between cement matrices and nanotubes, which is reflected in specimens’ compressive strength retention, as well as in decreased micro-cracking. However, exceeding the optimum amount of MWCNTs and MWCNT/NSs can lead to an agglomeration of nanomaterial, thus decreasing the thermal resistance of cement pastes.

Original languageEnglish
Pages (from-to)193-204
Number of pages12
JournalCement and Concrete Composites
Volume95
DOIs
Publication statusPublished - 2019 Jan

Bibliographical note

Publisher Copyright:
© 2018 Elsevier Ltd

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • General Materials Science

Fingerprint

Dive into the research topics of 'Mechanical and microstructural properties of cement pastes containing carbon nanotubes and carbon nanotube-silica core-shell structures, exposed to elevated temperature'. Together they form a unique fingerprint.

Cite this