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SEM/AFM studies of cementitious binder modified by MWCNT and nano-sized Fe needles
Laboratory of Building Materials Technology, Faculty of Engineering and Architecture, Helsinki University of Technology, Espoo.ORCID iD: 0000-0001-6287-2240
Laboratory of Building Materials Technology, Faculty of Engineering and Architecture, Helsinki University of Technology, Espoo.ORCID iD: 0000-0001-7279-6528
Department of Applied Physics and Center for New Materials, Helsinki University of Technology, Espoo.
Department of Applied Physics and Center for New Materials, Helsinki University of Technology, Espoo.
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2009 (English)In: Materials Characterization, ISSN 1044-5803, E-ISSN 1873-4189, Vol. 60, no 7, p. 735-740Article in journal (Refereed) Published
Abstract [en]

Several compositions of cement paste samples containing multiwalled carbon nanotubes were produced using a small-size vacuum mixer. The mixes had water-to-binder ratios of 0.25 and 0.3. Sulfate resistant cement has been used. The multiwalled carbon nanotubes were introduced as a water suspension with added surfactant admixtures. The used surfactant acted as plasticizing agents for the cement paste and as dispersant for the multiwalled carbon nanotubes. A set of beams was produced to determine the compressive and flexural strengths. The scanning electron microscope and atomic force microscope studies of fractured and polished samples showed a good dispersion of multiwalled carbon nanotubes in the cement matrix. The studies revealed also sliding of multiwalled carbon nanotubes from the matrix in tension which indicates their weak bond with cement matrix. In addition to multiwalled carbon nanotubes also steel wires covered with ferrite needles were investigated to determine the bond strength between the matrix and the steel wire. These later samples consisted of 15-mm-high cylinders of cement paste with vertically cast-in steel wires. As reference, plain steel wires were cast, too. The bond strength between steel wires covered with nano-sized Fe needles appeared to be lower in comparison with the reference wires. The scanning electron microscope studies of fractured samples indicated on brittle nature of Fe needles resulting in shear-caused breakage of the bond to the matrix. © 2008 Elsevier Inc. All rights reserved.

Place, publisher, year, edition, pages
2009. Vol. 60, no 7, p. 735-740
Keywords [sv]
AFM, Carbon nanotubes, SEM
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-10528DOI: 10.1016/j.matchar.2008.11.001Scopus ID: 2-s2.0-67349214942Local ID: 95859633-2a37-40af-af5a-40919f17ba2eOAI: oai:DiVA.org:ltu-10528DiVA, id: diva2:983473
Note

Upprättat; 2009; 20160222 (andcwi)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2019-08-16Bibliographically approved

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Cwirzen, A.Habermehl-Cwirzen, K.

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