Enhanced properties of graphene/fly ash geopolymeric composite cement

Research output: Research - peer-reviewArticle

  • Mohamed Saafi
  • Pik Leung Tang
  • Jason Fung
  • Mahbubur Rahman
  • John Liggat
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
Original languageEnglish
Pages (from-to)292–299
Number of pages8
JournalCement and Concrete Research
Volume67
Early online date1 Nov 2014
DOIs
StatePublished - Jan 2015

    Research areas

  • mechanical properties, reinforcement, composite, alkali activated cement

Bibliographical note

NOTICE: this is the author's version of a work that was accepted for publication in Cement and Concrete Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Cement and Concrete Research, [VOL 67, (1/1/15)] DOI: 10.1016/j.cemconres.2014.08.011

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