Incorporation of graphene oxide and silica fume into cement paste: A study of dispersion and compressive strength

Xiangyu Li, Asghar Habibnejad Korayem, Chenyang Li, Yanming Liu, Hongsen He, Jay G. Sanjayan, Wen Hui Duan

Research output: Contribution to journalArticleResearchpeer-review

86 Citations (Scopus)

Abstract

As a 2D nanomaterial, graphene oxide (GO) has attracted considerable attentions for reinforcing cementitious materials. However, special attention must be paid to the dispersion of GO in the matrix, as the quality of nanomaterial dispersion correlates directly with its effectiveness for improving mechanical and other properties. In this study, the dispersion of graphene oxide (GO) in simulated pore solution and cement paste was investigated. It was found that severe GO aggregation occurred in presence of divalent calcium ions in both pore solution and cement paste. However, the GO aggregates were not stable under shear mixing. After vigorous mixing, the massive GO aggregates split into medium-sized particles, ranging from few to several 100 μm. To improve the GO dispersion in cement paste, silica fume was used to mechanically separate individual GO nanosheets. The dispersion was then investigated using microstructure analysis and mechanical properties. The results showed that, with the addition of silica fume, the dispersion of GO nanosheets was greatly improved.

Original languageEnglish
Pages (from-to)327-335
Number of pages9
JournalConstruction and Building Materials
Volume123
DOIs
Publication statusPublished - 1 Oct 2016

Keywords

  • Cement paste
  • Dispersion
  • Graphene oxide
  • Pore solution
  • Silica fume

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