Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 161, Issue -, Pages 715-722Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2017.12.094
Keywords
Graphene nano-sheets; Polyoxyethylene (40) nonylphenylether; Cement paste; Chloride diffusion; Microstructure
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Funding
- National Natural Science Foundation of China [51578108]
- Special Fund for scientific Research in the Public Interest by Ministry of Water Resource of the People's Republic of China [201501003]
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In this work, the effects of the non covalent surface modification method on the dispersion of graphene nano-sheets (GNS) in water and chloride diffusion of the cement paste incorporating these dispersions were investigated. Results showed that stable and homogeneous suspensions of graphene nano-sheets were prepared using polyoxyethylene (40) nonylphenylether (CO890) as a dispersant. In this research, water to cement ration is kept 0.30, the addition of GNS is ranging from 0.02% to 0.15% by weight of cement. It is found that introduction small quantities of GNS as little as 0.02% can decrease the chloride penetration depth and coefficient by as much as similar to 37% and similar to 42%, respectively. This improvement could be attributed to the enhanced degree of cement hydration, filling effect, barrier effect and crack-arresting effect of GNS in cement matrix. This work provides a new way to further understand the improvement of GNS in cement composites. (C) 2017 Elsevier Ltd. All rights reserved.
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