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Distribution of carbon nanotubes in fresh ordinary Portland cement pastes: understanding from a two-phase perspective

Chen, Shu Jian, Wang, Wei, Sagoe-Crentsil, Kwesi, Collins, Frank, Zhao, Xiao Ling, Majumder, Mainak and Duan, Wen Hui 2016, Distribution of carbon nanotubes in fresh ordinary Portland cement pastes: understanding from a two-phase perspective, RSC advances, vol. 6, no. 7, pp. 5745-5753, doi: 10.1039/c5ra13511g.

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Title Distribution of carbon nanotubes in fresh ordinary Portland cement pastes: understanding from a two-phase perspective
Author(s) Chen, Shu Jian
Wang, Wei
Sagoe-Crentsil, Kwesi
Collins, FrankORCID iD for Collins, Frank orcid.org/0000-0001-6331-5390
Zhao, Xiao Ling
Majumder, Mainak
Duan, Wen Hui
Journal name RSC advances
Volume number 6
Issue number 7
Start page 5745
End page 5753
Total pages 9
Publisher Royal Society of Chemistry
Place of publication London, Eng.
Publication date 2016
ISSN 2046-2069
Keyword(s) Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Chemistry
MECHANICAL-BEHAVIOR
HYDRATION MODEL
COMPOSITES
DISPERSION
MICROSTRUCTURE
FUNCTIONALIZATION
NONCOVALENT
ADMIXTURES
SUSPENSION
POLYMERS
Summary Significant research advances have been made in the field of carbon nanotube (CNT) reinforced ordinary Portland cement (OPC) paste composites in recent years. However, the distribution of CNTs in fresh OPC paste is yet to be fully researched and quantified, thereby creating a technical barrier to CNT utilization in concrete construction. In this study, fresh OPC paste was treated as a two-phase material containing solid particles (cement grains) and liquid solutions (pore solutions). A centrifugation-based technique was proposed to separate these two phases and the presence of CNTs in each phase was quantified. UV-Vis spectrometry showed that the degree of dispersion can achieve above 90 wt% using polycarboxylate superplasticizer. The results suggested an upper limit of 0.26 wt% for CNT addition into water before mixing with OPC, and the dispersion was found to be stable for at least 4 hours. Based on scanning electron imaging, the adsorption phenomenon of CNTs on OPC grains with size less than 4 μm was discovered. Energy-dispersive X-ray spectroscopy indicated these adsorptive particles have lower Ca to Si ratio. It was observed that about 0.5 mg of CNTs per gram of OPC grains was adsorbed in solid OPC grains in typical fresh OPC pastes. On the basis of these results, a conceptual model was proposed for the distribution of CNTs in fresh OPC paste where about 33 wt% of the CNTs stay in pore solution and 65 wt% of CNTs are adsorbed on OPC grains.
Language eng
DOI 10.1039/c5ra13511g
Field of Research 090503 Construction Materials
Socio Economic Objective 870301 Cement and Concrete Materials
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, The Royal Society of Chemistry.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30081219

Document type: Journal Article
Collection: Institute for Frontier Materials
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