Properties of high yield synthesised carbon nano fibres/Portland cement composite

A. Cwirzen, K. Habermehl-Cwirzen, D. Shandakov, L.I. Nasibulina, A.G. Nasibulin, P.R. Mudimela, E.I. Kauppinen, V. Penttala

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)141-146
Number of pages16
JournalAdvances in Cement Research
Volume21
Issue number4
DOIs
Publication statusPublished - Oct 2009

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