Properties of high yield synthesised carbon nano fibres/Portland cement composite
| Autor: | Larisa I. Nasibulina, Esko I. Kauppinen, Karin Habermehl-Cwirzen, Vesa Penttala, Andrzej Cwirzen, Albert G. Nasibulin, Prasantha R. Mudimela, D. Shandakov |
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| Rok vydání: | 2009 |
| Předmět: |
musculoskeletal diseases
Cement Yield (engineering) Materials science Composite number technology industry and agriculture Building and Construction Carbon nanotube equipment and supplies Microstructure law.invention Portland cement Compressive strength law Electrical resistivity and conductivity General Materials Science Composite material |
| Zdroj: | Advances in Cement Research. 21:141-146 |
| ISSN: | 1751-7605 0951-7197 |
| DOI: | 10.1680/adcr.8.00021 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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