期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 232, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.117141
关键词
Nanocarbon; Nanofillers; Reinforced cement; Rheology; Graphene oxide; Hydration kinetics; Carbon nanotubes; Flexural strength
资金
- Ontario - Israel Collaboration Program (OICP) [56486]
- Israeli Innovation Authority [56486]
- Israel Science Foundation (ISF) [1106/17]
- European Union's Horizon 2020 research and innovation program [760824]
Carbon-based nanofillers (NFs) have a marked effect on the mechanical and rheological properties of polymeric and cementitious composites. In this study, we explored the role of four nanocarbon materials as NFs, namely, graphene nano-platelets (GNP) and carbon nanotubes (CNT) and their hydrophilic derivatives, graphene oxide (GO) and functionalized CNT (f-CNT), respectively. We investigated how the NF dimensionality and hydrophilicity affect the various properties of NF-cement composites in fresh (e.g., workability) and hardened (e.g., strength) states. This will enable one to judiciously choose an appropriate NF for a specific application. In that respect, the additive polycarboxylate ether (PCE) is employed both as a surfactant for the NF dispersion in the cementitious matrix and as a superplasticizer, reducing the composite mixture viscosity to enhance its workability. The addition of GO, CNT or f-CNT fillers (in the presence of 0.2 wt% PCE) demonstrated workability deterioration for all NF concentrations while that of the GNP-loaded system was much less affected. Among the four explored NE-loaded systems, GO (0.025 wt%) was the best reinforcing agent with enhancement of 60% in flexural and similar to 30% in compressive strengths. Nevertheless, GNP presents a cost-effective alternative, although a little inferior to GO in its mechanical performance. (C) 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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