High modulus concrete: Effects of low carbon nanotube and nanofiber additions

Maria S. Konsta-Gdoutos*, Panagiotis A. Danoglidis, Surendra P Shah

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

New tall building designs require higher modulus of concrete that allows to limit lateral deformations and decrease the size of structural elements. The modulus of conventional and high-strength concrete can dramatically improve with the addition of very low amounts of effectively dispersed CNTs and CNFs and without the need of optimizing the mixture proportions with the use of supplementary cementitious materials and/or stiffer aggregates. It is shown that while the American and European empirical relationships suggest the modulus as a function of the square or cube root of compressive strength, compared with concretes of similar modulus values, the addition of 0.1 wt% of CNTs and CNFs resulted in concretes exhibiting approximately 1.6 times higher modulus values at almost half the compressive strength. The proportionality of the compressive stress to strain curves of nanomodified conventional and high-strength concrete indicates that a higher load-carrying capacity in the elastic area can be achieved for loadings up to the percolation threshold. An increase in the count of individual carbon nanotubes and nanofibers above the threshold limit adversely affects the materials’ compliance and the resulting modulus of elasticity.

Original languageEnglish (US)
Article number102295
JournalTheoretical and Applied Fracture Mechanics
Volume103
DOIs
StatePublished - Oct 1 2019

Keywords

  • Carbon nanofibers
  • Carbon nanotubes
  • Compressive strength
  • High-strength concrete
  • Modulus of elasticity

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Applied Mathematics

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