Journal ArticleDOI
The influences of admixtures on the dispersion, workability, and strength of carbon nanotube-OPC paste mixtures
TLDR
In this paper, the results of investigations of the dispersion, workability, and strength of CNT aqueous and CNT-OPC paste mixtures, with and without several generically different dispersants/surfactants that are compatible as admixtures in the manufacture of concrete.Abstract:
Carbon nanotubes (CNT) have excellent mechanical properties and have the potential, if combined with Ordinary Portland Cement (OPC), traditionally a brittle material in tension, to become a nano-composite with superlative mechanical properties. However, highly attractive van der Waals forces between CNTs create coherent agglomerates that prove difficult to disperse within the cement matrix and reduce the fluidity of the fresh mixture. Good dispersion of CNTs, while maintaining good workability of fresh OPC–CNT paste mixtures, is a prequalification before CNT-cement nanocomposites can be considered as a future building and construction material with enhanced mechanical properties. This paper reports the results of investigations of the dispersion, workability, and strength of CNT aqueous and CNT–OPC paste mixtures, with and without several generically different dispersants/surfactants that are compatible as admixtures in the manufacture of concrete. These include an air entrainer, styrene butadiene rubber, polycarboxylates, calcium naphthalene sulfonate, and lignosulfonate formulations. Aqueous mixtures were initially assessed for dispersion of CNTs, followed by workability testing of selected OPC–CNT-dispersant/surfactant paste mixtures. A broad range of workability responses were measured and the CNT dispersion within hardened pastes was qualitatively assessed by SEM analysis.read more
Citations
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Journal ArticleDOI
Reinforcing effects of graphene oxide on portland cement paste
Kai Gong,Zhu Pan,Asghar Habibnejad Korayem,Ling Qiu,Dan Li,Francis Gerard Collins,Chien Ming Wang,Wenhui Duan +7 more
TL;DR: In this paper, the reinforcing effects of graphene oxide (GO) on portland cement paste are investigated, and it is discovered that the introduction of 0.03% by weight GO sheets into the cement paste can increase the compressive strength and tensile strength of the cement composite by more than 40%.
Journal ArticleDOI
Mechanical properties and microstructure of a graphene oxide-cement composite
Zhu Pan,Li He,Ling Qiu,Asghar Habibnejad Korayem,Gang Li,Jun Wu Zhu,Frank Collins,Dan Li,Wenhui Duan,Ming Chien Wang,Ming Chien Wang +10 more
TL;DR: Graphene oxide (GO) is the product of chemical exfoliation of graphite and is a potential candidate for use as nanoreinforcements in cement-based materials as discussed by the authors.
Journal ArticleDOI
Nano reinforced cement and concrete composites and new perspective from graphene oxide
TL;DR: In this article, the effect of incorporating nanomaterials in low dosages to the fabrication, workability, hydration, microstructure, and mechanical properties of cement-based composites are comprehensively reviewed.
Journal ArticleDOI
A review on nanomaterial dispersion, microstructure, and mechanical properties of carbon nanotube and nanofiber reinforced cementitious composites
TL;DR: In this article, a critical review of recent literature on the various strategies for dispersing CNTs and CNFs within cementitious matrices and the microstructure and mechanical properties of resulting nanocomposites is presented.
Journal ArticleDOI
Review of nanocarbon-engineered multifunctional cementitious composites
TL;DR: In this paper, a review of the recent progress of fabrication, properties, and structural applications of high-performance and multifunctional cementitious composites with carbon nanofibers, carbon nanotubes and nano graphite platelets is presented.
References
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Journal ArticleDOI
Small but strong: A review of the mechanical properties of carbon nanotube–polymer composites
TL;DR: In this article, a review of the progress to date in the field of mechanical reinforcement of polymers using nanotubes is presented, and the most promising processing methods for mechanical reinforcement are discussed.
Journal ArticleDOI
The role of surfactants in dispersion of carbon nanotubes
TL;DR: Recent progress and advances that have been made on dispersion of carbon nanotubes in aqueous and organic media by non-covalent adsorption of surfactants and polymers are reviewed.
Journal ArticleDOI
Super-tough carbon-nanotube fibres
Alan B. Dalton,Steve Collins,Edgar Muñoz,Joselito M. Razal,Von Howard Ebron,John P. Ferraris,Jonathan N. Coleman,Bog G. Kim,Ray H. Baughman +8 more
TL;DR: This work spins 100-metre-long carbon-nanotube composite fibres that are tougher than any natural or synthetic organic fibre described so far, and uses these to make fibre supercapacitors that are suitable for weaving into textiles.
Journal ArticleDOI
Mechanical behavior and microstructure of cement composites incorporating surface-treated multi-walled carbon nanotubes
TL;DR: In this paper, multi-walled carbon nanotubes after modified by using a H2SO4 and HNO3 mixture solution were added to cement matrix composites to improve the flexural strength, compressive strength, and failure strain.