Highly dispersed carbon nanotube reinforced cement based materials

Maria S. Konsta-Gdoutos*, Zoi S. Metaxa, Surendra P. Shah

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

528 Scopus citations

Abstract

The remarkable mechanical properties of carbon nanotubes (CNT) suggest that they are ideal candidates for high performance cementitious composites. The major challenge however, associated with the incorporation of CNTs in cement based materials is poor dispersion. In this study, effective dispersion of different length multiwall carbon nanotubes (MWCNTs) in water was achieved by applying ultrasonic energy and in combination with the use of a surfactant. The effects of ultrasonic energy and surfactant concentration on the dispersion of MWCNTs at an amount of 0.08 wt.% of cement were investigated. It is shown that for proper dispersion the application of ultrasonic energy is absolutely required and for complete dispersion there exists an optimum weight ratio of surfactant to CNTs. For a constant ratio of surfactant to MWCNTs, the effects of MWCNT type (short and long) and concentration on the fracture properties, nanoscale properties and microstructure of nanocomposite materials were also studied. Results suggest that MWCNTs improve the nano- and macromechanical properties of cement paste.

Original languageEnglish (US)
Pages (from-to)1052-1059
Number of pages8
JournalCement and Concrete Research
Volume40
Issue number7
DOIs
StatePublished - Jul 2010

Keywords

  • Carbon nanotubes
  • Dispersion
  • Fiber reinforcement
  • Mechanical properties
  • Scanning electron microscopy (SEM)

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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