Fundamental interactions between multi-walled carbon nanotubes (MWCNT), Ca2+and polycarboxylate superplasticizers in cementitious systems

Ilina Kondofersky-Mintova, Johann Plank

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

The fundamental interactions between polycarboxylate superplasticizers (PCEs), multi-walled carbon nanotubes (MWCNTs), Ca2+ ions and cement were investigated. Two commercial samples of MWCNTs were characterized by SEM and TEM imaging. It was found that only one sample contained mostly individual, non-agglomerated CNTs which were used in further tests. The MWCNT sample reduced cement paste flowability, but increased 28 day compressive strength by ∼ 20% and tensile strength by 26%. The relatively modest increase can be attributed to agglomeration of individual CNTs into large bundles (Φ ∼ 900 nm, 3.51 × 10-5 in.). Agglomeration is caused by adsorption of Ca2+ ions onto the initially negatively charged surfaces of CNTs. This way, Ca2+ ions present in every cement pore solution impede maximal dispersion of CNTs in the cementitious matrix, thus limiting their potential application as nano reinforcement for concrete.

Original languageEnglish
Title of host publication10th International Conference on Superplasticizers and Other Chemical Admixtures 2012
PublisherAmerican Concrete Institute
Pages423-434
Number of pages12
Edition288 SP
ISBN (Print)9781622766406
StatePublished - 2012
Externally publishedYes
Event10th International Conference on Superplasticizers and Other Chemical Admixtures 2012 - Prague, Czech Republic
Duration: 28 Oct 201231 Oct 2012

Publication series

NameAmerican Concrete Institute, ACI Special Publication
Number288 SP
ISSN (Print)0193-2527

Conference

Conference10th International Conference on Superplasticizers and Other Chemical Admixtures 2012
Country/TerritoryCzech Republic
CityPrague
Period28/10/1231/10/12

Keywords

  • Carbon nanotubes
  • Concrete
  • Polycarboxylate
  • Strength

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