Carbon nanotubes reinforced concrete

Z. S. Metaxa, M. S. Konsta-Gdoutos, Surendra P Shah

Research output: Chapter in Book/Report/Conference proceedingConference contribution

49 Scopus citations

Abstract

Synopsis: In this study, the development of cementitious nanocomposites reinforced with multiwall carbon nanotubes (MWCNTs) at water-cement ratios of 0.3 and 0.5 was investigated. The effect of carbon nanotubes at low concentrations on the fracture properties, nanoscale properties and micro-structure of the nanocomposite materials was studied. The morphology and the microstructure of nanocomposite samples were investigated using an ultra high resolution field emission scanning electron microscope. A special type of nanoindenter, along with in-place scanning probe microscopy imaging, was used to determine the local nanoscale mechanical properties. The results show that the mechanical properties of cementitious matrices can be increased by the incorporation of very low amounts of CNTs. Nanoimaging of the fracture surfaces of cement nanocomposites have shown that CNTs reinforce cement paste by bridging the nanocracks and pores. Additionally, nanoindentation results suggest that CNTs modify and reinforce the nanostructure of cement paste by increasing the amount of high stiffness C-S-H and reducing the porosity.

Original languageEnglish (US)
Title of host publicationNanotechnology of Concrete
Subtitle of host publicationThe Next Big Thing is Small - Session at the ACI Fall 2009 Convention
Pages11-20
Number of pages10
Edition267 SP
StatePublished - Dec 1 2009
EventACI Fall 2009 Convention - New Orleans, LA, United States
Duration: Nov 8 2009Nov 12 2009

Other

OtherACI Fall 2009 Convention
CountryUnited States
CityNew Orleans, LA
Period11/8/0911/12/09

Keywords

  • Carbon nanotubes
  • Mechanical properties
  • Nanofiber reinforcement
  • Nanoindentation
  • Scanning electron microscopy

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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