Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 123, Issue -, Pages 327-335Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2016.07.022
Keywords
Graphene oxide; Silica fume; Dispersion; Cement paste; Pore solution
Categories
Funding
- Australian Research Council
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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 mu m. 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. (C) 2016 Elsevier Ltd. All rights reserved.
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