Chemically functionalized graphene oxide as the additive for cement–matrix composite with enhanced fluidity and toughness. (30th September 2017)

• Record Type: Journal Article
• Authors: Wang, Min; Yao, Hao; Wang, Rumin; Zheng, Shuirong
• Is Part Of: Construction & building materials. Volume 150(2017)
• Page Start: 150
• Page End: 156
• Publication Date: 2017-09-30
• Subjects: Graphene oxide -- Cement -- Polyether amine -- Fluidity -- Chemically functionalized; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2017.05.217
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: The first way to use chemically functionalized graphene oxide solve negative influence of GO on the cement fluidity. First demonstration on the relationship of branched chain (polyether amine) molecular weight and cement properties. Provide a new direction of GO nanosheets were used for improving cement properties. Abstract: Chemically functionalized graphene oxide (GOM) was synthesized by the chemical reaction of polyether amine with graphene oxide (GO). The mechanical properties, rheological properties, dispersion effectiveness, slump retention behavior and the mechanism of GOM modified cement were also researched. The results show that GOM have more effective toughing function than cement with GO. And GOM can increase the slump flow of cement. The slump flow, the dispersion effectiveness and slump retention of GOM modified cement increased with the increasing molecular weight of polyether amine. The main chain (sheets structure) of GOM adsorbed on the cement surface, and the branched chains (polyether amine) stretched into the water. The electrostatic repulsive forces of adsorption layers and steric hindrance of branched chains endowed the good fluidity of cement.