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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. and Savina, I. (2017) Effect of high-intensity sonication on the dispersion of carbon-based nanofilaments in cementitious composites, and its impact on mechanical performance Materials & Design, 136, pp. 223-237.

Record type: Article

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.

Text Alrekabi revised manuscript postprint - Accepted Manuscript
Restricted to Repository staff only until 15 December 2018.
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More information

Accepted/In Press date: 28 September 2017
e-pub ahead of print date: 28 September 2017
Published date: 15 December 2017

Identifiers

Local EPrints ID: 414873
URI: http://eprints.soton.ac.uk/id/eprint/414873
ISSN: 02641275
PURE UUID: 8b70052f-ae47-497b-b71f-a5f4a80a09c1
ORCID for A.B. Cundy: ORCID iD orcid.org/0000-0003-4368-2569

Catalogue record

Date deposited: 13 Oct 2017 16:30
Last modified: 19 Oct 2017 02:56

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Contributors

Author: S. Alrekabi
Author: A.B. Cundy ORCID iD
Author: A. Lampropoulos
Author: Raymond L.D. Whitby
Author: I. Savina

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