Shenghua LyuShaanxi University of Science & Technology, China
Shenghua lv is a professor in College of Resources and Environment at Shanxi University of Science & Technology (China). He got B.S. degree in chemistry from Xianyang Teacher College in 1984, M.S. degree in applied chemistry from Shan’xi University of Science & Technology in 1997, Ph.D. degree in macromolecular materials from Northwestern Polytechnical University in 2005. During 1984-1994, he worked as lecturer at Xianyang Teacher College. From 1997-2005, he worked as assistant professor at Shan’xi University of Science & Technology, undertook research on chemical modification of starch and application. Since 2005, he was promoted to professor, undertook research on synthesis and application of vinyl polymer. During 2009-2010, he worked at Clausthal University of Technology, Germany.
Title：Use of Graphene Oxide Nanosheets to Regulate the Microstructure of Hardened Cement Paste to Increase Its Strength and Toughness
SymposiumBuilding Materials
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Abstract
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 GO nanosheets are prepared, and it is found that GO formation of 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 cement. The compressive strength and toughness of the corresponding hardened cement paste are found to increase markedly compared with a control sample. The results suggest that GO nanosheets can control the crystalline form and the assembly of 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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