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

Larisa I. Nasibulina, Ilya V. Anoshkin, Albert G. Nasibulin, Andrzej Cwirzen, Vesa Penttala, Esko I. Kauppinen

Research output: Contribution to journalArticleScientificpeer-review

51 Citations (Scopus)
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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 8 0 ∘ 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.
Original languageEnglish
Article number169262
Pages (from-to)1-6
JournalJournal of Nanomaterials
Volume2012
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

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