Effect of carbon nanotube aqueous dispersion quality on mechanical properties of cement composite

Nasibulina, Larisa I.Department of Applied Physics, Aalto University School of Science (author)

Upprättat; 2012; 20160222 (andcwi)
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 (70wt. and 96wt., 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. Copyright © 2012 Larisa I. Nasibulina et al.

Anoshkin, Ilya V.Department of Applied Physics, Aalto University School of Science (author)
Nasibulin, Albert G.Department of Applied Physics, Aalto University School of Science (author)
Cwirzen, AndrzejDepartment of Civil and Structural Engineering, Aalto University, School of Engineering, Espoo(Swepub:ltu)andcwi (author)
Penttala, VesaDepartment of Civil and Structural Engineering, Aalto University, School of Engineering, Espoo (author)
Kauppinen, Esko I.Department of Applied Physics, Aalto University School of Science (author)
Department of Applied Physics, Aalto University School of ScienceDepartment of Civil and Structural Engineering, Aalto University, School of Engineering, Espoo (creator_code:org_t)

By the author/editor: Nasibulina, Lari ...; Anoshkin, Ilya V ...; Nasibulin, Alber ...; Cwirzen, Andrzej; Penttala, Vesa; Kauppinen, Esko ...

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Civil Engineerin ...; and Infrastructure E ...

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