Enhanced properties of graphene/fly ash geopolymeric composite cement

Mohamed Saafi, Pik Leung Tang, Jason Fung, Mahbubur Rahman, John Liggat

Research output: Contribution to journalArticle

  • 43 Citations

Abstract

This paper reports for the first time the incorporation of in-situ reduced graphene oxide (rGO) into geopolymers. The resulting rGO-geopolymeric composites are easy to manufacture and exhibit excellent mechanical properties. Geopolymers with graphene oxide (GO) concents of 0.00, 0.10, 0.35 and 0.50% by weight were fabricated. The functional groups, morphology, void filling mechanisms and mechanical properties of the composites were determined. The Fourier transform infrared (FTIR) spectra revealed that the alkaline solution reduced the hydroxyl/carbonyl groups of GO by deoxygenation and/or dehydration. Concomitantly, the spectral absorbance related to silica type cross-linking increased in the spectra. The scanning electron microscope (SEM) micrographs indicated that rGO altered the morphology of geopolymers from a porous nature to a substantially pore filled morphology with increased mechanical properties. The flexural tests showed that 0.35-wt% rGO produced the highest flexural strength, Young’s modulus and flexural toughness and they were increased by 134%, 376% and 56%, respectively
LanguageEnglish
Pages292–299
Number of pages8
JournalCement and Concrete Research
Volume67
Early online date1 Nov 2014
DOIs
StatePublished - Jan 2015

Fingerprint

Coal Ash
Graphite
Fly ash
Oxides
Graphene
Cements
Geopolymers
Composite materials
Mechanical properties
Dehydration
Silicon Dioxide
Bending strength
Hydroxyl Radical
Functional groups
Toughness
Fourier transforms
Electron microscopes
Elastic moduli
Silica
Infrared radiation

Keywords

  • mechanical properties
  • reinforcement
  • composite
  • alkali activated cement

Cite this

Saafi, Mohamed ; Tang, Pik Leung ; Fung, Jason ; Rahman, Mahbubur ; Liggat, John. / Enhanced properties of graphene/fly ash geopolymeric composite cement. In: Cement and Concrete Research. 2015 ; Vol. 67. pp. 292–299
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abstract = "This paper reports for the first time the incorporation of in-situ reduced graphene oxide (rGO) into geopolymers. The resulting rGO-geopolymeric composites are easy to manufacture and exhibit excellent mechanical properties. Geopolymers with graphene oxide (GO) concents of 0.00, 0.10, 0.35 and 0.50{\%} by weight were fabricated. The functional groups, morphology, void filling mechanisms and mechanical properties of the composites were determined. The Fourier transform infrared (FTIR) spectra revealed that the alkaline solution reduced the hydroxyl/carbonyl groups of GO by deoxygenation and/or dehydration. Concomitantly, the spectral absorbance related to silica type cross-linking increased in the spectra. The scanning electron microscope (SEM) micrographs indicated that rGO altered the morphology of geopolymers from a porous nature to a substantially pore filled morphology with increased mechanical properties. The flexural tests showed that 0.35-wt{\%} rGO produced the highest flexural strength, Young’s modulus and flexural toughness and they were increased by 134{\%}, 376{\%} and 56{\%}, respectively",
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Enhanced properties of graphene/fly ash geopolymeric composite cement. / Saafi, Mohamed; Tang, Pik Leung; Fung, Jason; Rahman, Mahbubur; Liggat, John.

In: Cement and Concrete Research, Vol. 67, 01.2015, p. 292–299.

Research output: Contribution to journalArticle

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