Effect of Carbon Nanotube Aqueous Dispersion Quality on Mechanical Properties of Cement Composite

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© 2012 Larisa I. Nasibulina et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2012
Major/Subject
Mcode
Degree programme
Language
en
Pages
1-6
Series
Journal of Nanomaterials, Volume 2012
Abstract
An effect of the quality of carbon nanotube (CNT) dispersions added to cement on paste mechanical properties has been studied. High-quality dispersions of few-walled CNT (FWCNTs) were produced in two steps. First, FWCNTs were functionalized in a mixture of nitric and sulfuric acids (70 wt.% and 96 wt.%, resp.) at 80 ∘C . Second, functionalized FWCNTs were washed out by acetone to remove carboxylated carbonaceous fragments (CCFs) formed during CNT oxidation. Mechanical test results showed 2-fold increase in the compressive strength of the cement paste prepared from the dispersion of acetone-washed functionalized FWCNTs, which is believed to occur due to the chemical interaction between cement matrix and functional groups (–COOH and –OH). Utilisation of unwashed FWCNTs led to a marginal improvement of mechanical properties of the cement pastes, whereas surfactant-treated functionalized FWCNT dispersions only worsened the mechanical properties.
Description
Keywords
FWCNT dispersions, cement, mechanical properties, cement composites
Other note
Citation
Nasibulina, Larisa I. & Anoshkin, Ilya V. & Nasibulin, Albert G. & Cwirzen, Andrzej & Penttala, Vesa & Kauppinen, Esko I. 2012. Effect of Carbon Nanotube Aqueous Dispersion Quality on Mechanical Properties of Cement Composite. Journal of Nanomaterials. Volume 2012. 1-6. ISSN 1687-4110 (printed). DOI: 10.1155/2012/169262