Journal ArticleDOI
Surface decoration of carbon nanotubes and mechanical properties of cement/carbon nanotube composites
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In this article, the effects of surface decoration on the wetability of multi-walled carbon nanotubes (MWCNTs) and the mechanical properties of the cement paste incorporating these dispersions were investigated.Abstract:
The present study investigated the effects of the method of surface decoration on the wetability of multi-walled carbon nanotubes (MWCNTs) and the mechanical properties of the cement paste incorporating these dispersions. The results showed that stable and homogenous dispersions of MWCNTs in water can be obtained by using surface functionalisation combined with decoration using polyacrylic acid polymers. The cement paste specimens incorporating these dispersions revealed good workability and an increase in the compressive strength of nearly 50% even with only a small addition of the MWCNTs, namely 0·045–0·15% of the cement weight. These results indicate the existence of chemical bonds between the OH groups of the functionalised MWCNTs and probably the CSH phase of the cement matrix, which enhanced the transfer of stresses. A second method that was studied included decoration of MWCNTs with polyacrylic acid polymers and gum Arabic. These dispersions appeared to be homogeneous only for approximately 2 h aft...read more
Citations
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Journal ArticleDOI
Nanotechnology in concrete – A review
TL;DR: In this paper, the state of the field of nanotechnology in concrete is reviewed and the impact of recent advances in instrumentation and computational materials science and their use in concrete research is discussed.
PatentDOI
Highly dispersed carbon nanotube-reinforced cement-based materials
TL;DR: In this paper, a composite cement material is prepared from cement material and carbon nanotubes, wherein the carbon-nanotubes are present from about 002 wt % to about 1 0 % based on the weight of the cement material.
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
Multi-scale mechanical and fracture characteristics and early-age strain capacity of high performance carbon nanotube/cement nanocomposites
TL;DR: In this article, the reinforcing effect of highly dispersed multiwall carbon nanotubes (MWCNTs) in cement paste matrix has been investigated, and the MWCNTs were effectively dispersed in the mixing water by using a simple, one-step method utilizing ultrasonic energy and a commercially available surfactant.
Journal ArticleDOI
Construction and demolition waste generation and properties of recycled aggregate concrete: A global perspective
Ali Akhtar,Ajit K. Sarmah +1 more
TL;DR: In this paper, the authors present the status of construction and demolition waste generation around the world and subsequently provide a critical review of the recent studies conducted to improve the properties of recycled aggregate concrete through different supplementary materials.
References
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Journal ArticleDOI
Helical microtubules of graphitic carbon
TL;DR: Iijima et al. as mentioned in this paper reported the preparation of a new type of finite carbon structure consisting of needle-like tubes, which were produced using an arc-discharge evaporation method similar to that used for fullerene synthesis.
Journal ArticleDOI
Exceptionally high Young's modulus observed for individual carbon nanotubes
TL;DR: In this article, the amplitude of the intrinsic thermal vibrations of isolated carbon nanotubes was measured in the transmission electron microscopy (TEM) and it was shown that they have exceptionally high Young's moduli, in the terapascal (TPa) range.
Journal ArticleDOI
Reversible water-solubilization of single-walled carbon nanotubes by polymer wrapping
Michael J. O'Connell,Peter J. Boul,Lars M. Ericson,Chad B. Huffman,YuHuang Wang,Erik H. Haroz,Cynthia Kuper,Jim Tour,Kevin D. Ausman,Richard E. Smalley +9 more
TL;DR: In this paper, a general thermodynamic drive for this wrapping is discussed, wherein the polymer disrupts both the hydrophobic interface with water and the smooth tube-tube interactions in aggregates.
Journal ArticleDOI
Carbon nanotubes, buckyballs, ropes, and a universal graphitic potential
TL;DR: In this paper, the potential energies of interaction between two parallel, infinitely long carbon nanotubes of the same diameter, and between a nanotube in various arrangements, were computed by assuming a continuous distribution of atoms on the tube and ball surfaces and using a Lennard-Jones (LJ) carbon-carbon potential.
Journal ArticleDOI
Stabilization of Individual Carbon Nanotubes in Aqueous Solutions
TL;DR: In this article, a simple procedure for dispersing as-produced nanotubes powder in aqueous solutions of Gum Arabic is described, and a stable dispersion of full-length, well separated, individual tubes is formed.