Effect of high-intensity sonication on the dispersion of carbon-based nanofilaments in cementitious composites, and its impact on mechanical performance

S. Alrekabi, A. B. Cundy, A. Lampropoulos, Raymond L.D. Whitby, I. Savina

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Carbon-based nanofilaments are promising materials for improving the mechanical performance of cementitious composites. To date, the main challenge in their effective use has been controlling the dispersion of these additives in water and in the resulting mixed composites due to their strong van der Waals self-attraction and hydrophobic surfaces. This study uses high-intensity sonication to disperse different nanofilament types in water, and assesses their resulting reinforcing efficiency in cementitious composites. The proportion of nanofilaments used (in this case, multiwall carbon nanotubes MWCNTs, functionalized multiwall carbon nanotubes F-MWCNTs, and carbon nanofibres CNFs) was 0.025% by weight of cement. Aqueous dispersions were examined using transmission electron microscopy (TEM) and optical microscopy, and ultraviolet-visible (UV–vis) spectroscopy. Compressive, flexural and splitting tensile strengths tests, and porosity and density measurements, were used to evaluate the mechanical properties of the composites. High-intensity sonication over short durations significantly improved the dispersion, and reinforcing and filling effects, of carbon-based nanofilaments in cementitious composites, with increases in compressive strength of 24–32%, splitting tensile strength of 45–50%, and flexural toughness factor of 30–40%, observed after 28 days curing. A 17–26% reduction in the porosity of the composite materials was also recorded.

Original languageEnglish
Pages (from-to)223-237
Number of pages15
JournalMaterials and Design
Volume136
DOIs
Publication statusPublished - Dec 15 2017

Fingerprint

Sonication
Carbon
Composite materials
Carbon Nanotubes
Carbon nanotubes
Tensile strength
Porosity
Carbon nanofibers
Water
Ultraviolet visible spectroscopy
Dispersions
Compressive strength
Toughness
Optical microscopy
Curing
Cements
Transmission electron microscopy
Mechanical properties

Keywords

  • Carbon based nanofilaments
  • Cementitious composites
  • Dispersion
  • High-intensity sonication
  • Mechanical performance

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Effect of high-intensity sonication on the dispersion of carbon-based nanofilaments in cementitious composites, and its impact on mechanical performance. / Alrekabi, S.; Cundy, A. B.; Lampropoulos, A.; Whitby, Raymond L.D.; Savina, I.

In: Materials and Design, Vol. 136, 15.12.2017, p. 223-237.

Research output: Contribution to journalArticle

Alrekabi, S. ; Cundy, A. B. ; Lampropoulos, A. ; Whitby, Raymond L.D. ; Savina, I. / Effect of high-intensity sonication on the dispersion of carbon-based nanofilaments in cementitious composites, and its impact on mechanical performance. In: Materials and Design. 2017 ; Vol. 136. pp. 223-237.
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