Mechanical Properties of Nanocomposite Cement Incorporating Surface-Treated and Untreated Carbon Nanotubes and Carbon Nanofibers

Rashid K. Abu Al-Rub, Bryan M. Tyson, Ardavan Yazdanbakhsh, Zachary Grasley

Research output: Contribution to journalArticlepeer-review

135 Scopus citations

Abstract

To study the effects of functionalized carbon nanotubes (CNTs) and carbon nanofibers (CNFs) on the mechanical properties of cement composites, both untreated and treated CNFs and CNTs were added to cement paste in concentrations of 0.1% and 0.2% by weight of cement. The surface-treated nanofilaments were functionalized in a solution of sulfuric acid (H 2SO 4) and nitric acid (HNO 3). The nanofilaments were dispersed by using an ultrasonic mixer and were then cast into molds. Each specimen was tested in a custom-made three-point flexural test fixture to record the mechanical properties (i.e., the Young's modulus, flexural strength, ductility, and modulus of toughness) at the age of 7, 14, and 28 days. The microstructure was analyzed by using a scanning electron microscope. Untreated CNTs and CNFs were found to enhance the mechanical properties of cementitious materials, whereas the acid-treated CNTs and CNFs degraded the mechanical properties.

Original languageBritish English
Pages (from-to)1-6
Number of pages6
JournalJournal of Nanomechanics and Micromechanics
Volume2
Issue number1
DOIs
StatePublished - 27 Mar 2012

Keywords

  • Carbon nanofibers
  • Carbon nanotubes
  • Cement
  • Mechanical properties
  • Surface treatment

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