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Properties of high yield synthesised carbon nano fibres/portland cement composite
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: Advances in Cement Research, ISSN 0951-7197, E-ISSN 1751-7605, Vol. 21, no 4, p. 141-146Article in journal (Refereed) Published
Abstract [en]

The compressive strength and electrical resistivity of hardened pastes produced either from nanomodified Portland sulfate-resistant cement (CHH) or a mixture of nanomodified and pristine sulfate-resistant cements were determined. The nanomodification included grow carbon nanotubes (CNTs) and carbon nanofibres (CNFs) on the cement particles. Pastes having a water-to-binder ratio of 0-5 were produced. The test results revealed that partial replacement of sulfate-resistant cement by CHH cement decreased the electrical resistivity of the 28 day old specimens but worsened the mechanical properties. The lower compressive strength was attributed to a lower degree of hydration of the CHH cement. The addition of a mixture of surfactants enabled the production of specimens consisting entirely of CHH cement. The hardened material obtained was characterised by a nearly doubled compressive strength in comparison with the reference specimens made from pristine sulfate-resistant cement. This was attributed to a high degree of hydration as well as reinforcing action of the CNTs and CNFs. The electrical resistivity was lowered by one order of magnitude classifying this material as a semiconductor.

Place, publisher, year, edition, pages
2009. Vol. 21, no 4, p. 141-146
National Category
Infrastructure Engineering
Research subject
Structural Engineering
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URN: urn:nbn:se:ltu:diva-4189DOI: 10.1680/adcr.8.00021Scopus ID: 2-s2.0-77949756761Local ID: 2189bbdc-fd8e-4040-b40a-447b3e59470bOAI: oai:DiVA.org:ltu-4189DiVA, id: diva2:977053
Note

Upprättat; 2009; 20160222 (andcwi)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2019-03-28Bibliographically approved

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Cwirzen, A.Habermehl-Cwirzen, K.

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