Journal
CRYSTENGCOMM
Volume 16, Issue 36, Pages 8508-8516Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ce00684d
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Funding
- China National Nature Science Foundation [21276152]
- academic research foundation of Shaanxi University of Science Technology [2013XSD29]
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Graphene oxide (GO) nanosheets are prepared by oxidation of graphite followed by sonication exfoliation. FTIR and AFM results indicate that the GO nanosheets have a thickness of about 6 nm, and that the GO surface is covered with oxygenated groups (-OH, -O-, -COOH and -SO3H). Hardened cement pastes containing different proportions of the GO nanosheets are prepared, and it is found that the GO formed both flower-like and polyhedron-like crystals, with these effects increasing as the GO content increases from 0.01% to 0.06% by weight of the cement. The compressive strength and toughness of the corresponding hardened cement paste are found to be markedly increased compared to a control sample. The results suggest that the GO nanosheets can control the crystalline form and assembly of the cement hydration products. A formation mechanism for regular hydration crystals is proposed, based on the experimental results. This research indicates significant potential for the practical application of GO nanosheets in the preparation of cement-based materials of high strength and durability.
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