Hits:

Indexed by:期刊论文

Date of Publication:2018-02-10

Journal:CONSTRUCTION AND BUILDING MATERIALS

Included Journals:SCIE

Volume:161

Page Number:715-722

ISSN No.:0950-0618

Key Words:Graphene nano-sheets; Polyoxyethylene (40) nonylphenylether; Cement paste; Chloride diffusion; Microstructure

Abstract: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.