Cement and Concrete Nanoscience and Nanotechnology

Raki, Laïla; Beaudoin, J.J.; Alizadeh, Rouhollah; Makar, J.M.; Sato, Taijiro

doi:10.3390/ma3020918

Cited by 402 publications

(209 citation statements)

References 70 publications

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“…Most research work to date has been done with carbon nanotubes added to cement pastes and concretes [4,[6][7][8][9] neglecting the study with soil matrixes. The carbon nanotubes are not a cementitious material but once introduced in a soil they are expected to reduce the interparticles' spacing, which will promote the construction of a stronger and stiffer soil skeleton matrix, together with the cementitious materials, therefore improving the mechanical properties of the soil.…”

Section: Introductionmentioning

confidence: 99%

Surfactants for dispersion of carbon nanotubes applied in soil stabilization

Figueiredo

Correia

Hunkeler³

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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a b s t r a c tThe discovery of the unique properties of carbon nanotubes (CNT) did grow interest to its application in nanocomposites, for a wide variety of purposes. However, the greatest challenge for its application is associated with the natural tendency to aggregate, resulting in the loss of its beneficial properties. To overcome this problem it is common the use of surfactants and/or ultrasonic energy to promote their dispersion in suspension. This work is focused on the influence of surfactants' properties on the dispersion of carbon nanotubes and on the influence of the quality of the dispersions on the mechanical properties of stabilized soil. Two surfactants (Glycerox and Amber 4001 differing in molecular weight and charge) were fully characterized, followed by the study of which surfactant concentrations were more efficient on the dispersion of the CNTs. The characterization methods were based on light scattering techniques: Dynamic Light Scattering (DLS) for the hydrodynamic diameter and Static Light Scattering (SLS) for the molecular weight. Suspensions of CNTs were prepared in solutions of the aforementioned surfactants, with different concentrations, and further dispersion was promoted using ultra-sounds (20 kHz during 5 min). The dispersions of CNTs in these two surfactants were then fully characterized using again DLS. Finally, the dispersions of carbon nanotubes were added to the main agent responsible for soil stabilization, the binder (Portland cement type I 42.5R), and the mechanical behavior of the new composite material was studied by unconfined compression strength (UCS) tests. The results of the UCS tests led to conclude that the introduction of CNTs in the binder can have huge impact on the mechanical properties of the stabilized soil. Furthermore, the quality of the dispersion of CNTs has got a very high impact on the performance achieved. It was verified an improvement up to 77% on the compressive strength of the material and 155% on Young's modulus, referred to the reference test where no carbon nanotubes nor surfactant were added, fundamentally dependent on surfactant type and concentration used.

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Section: Introductionmentioning

confidence: 99%

Surfactants for dispersion of carbon nanotubes applied in soil stabilization

Figueiredo

Correia

Hunkeler³

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…The development of new nanosized fibers has opened a new field for nanosized reinforcement within cement-based materials. Nanofibers can not only improve the fracture properties of cementitious matrix by controlling the cracks at the nanoscale level but also improve the early age strain capacity of the cementitious matrix (thus preventing the crack initiation) whereas microfibers reinforce concrete by delaying the development of formed microcracks (Ref [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…Carbon nanotubes (CNTs) are considered one of the most beneficial nanomaterials for reinforcement on the nanometer scale with amazing mechanical properties (e.g., ultra-high strength and stiffness, and elastic stress-strain behavior) (Ref [4][5][6][7]. The YoungÕs modulus of the best CNTs can be as high as 1000 GPa which is approximately 5 times higher than steel.…”

Section: Introductionmentioning

confidence: 99%

Transport Properties of Carbon-Nanotube/Cement Composites

Han

Yang

Shi

et al. 2012

J. of Materi Eng and Perform

130

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This paper preliminarily investigates the general transport properties (i.e., water sorptivity, water permeability, and gas permeability) of carbon-nanotube/cement composites. Carboxyl multi-walled carbon nanotubes (MWNTs) are dispersed into cement mortar to fabricate the carbon nanotubes (CNTs) reinforced cement-based composites by applying ultrasonic energy in combination with the use of surfactants (sodium dodecylbenzene sulfonate and sodium dodecyl sulfate). Experimental results indicate that even at a very small dosage the addition of MWNTs can help decrease water sorptivity coefficient, water permeability coefficient, and gas permeability coefficient of cement mortar, which suggests that CNTs can effectively improve the durability properties of cement-based composites.

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“…The parameters characterizing the structure of the hydrated calcium silicate particles, the ratio of the free and bound water the presence of pores and their shape and size distribution, i.e. the structural parameters of the material at micro and nanoscale [7][8][9], affect the properties of the resulting cement brick [12,13]. It is possible to obtain certain specified properties of building materials with cement by using sludge as additives to be fillers or modifiers.…”

Section: Methodsmentioning

confidence: 99%

Technogenic resources for nanotechnologies in construction

2017

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Abstract.A large group of industrial wastes from water purification, treatment and softening has been considered. The reference is made to the fact that slurries are a unique man-made product technologically ready for use and constantly restocking. Slurries have been classified by conditions of the formation, composition, chemical and physical properties. The nanoscale structural parameters of the slurry particles (the size distribution and fractal dimension) have been determined by the neutron small-angle scattering method. The conducted researches allow slurries to be considered a nanotechnogenic raw material. The use of slurries as additives in the building material production process reduces the harmful influence of industrial wastes on the environment and creates a significant reserve of material and energy resources in the construction industry.

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Cement and Concrete Nanoscience and Nanotechnology

Cited by 402 publications

References 70 publications

Surfactants for dispersion of carbon nanotubes applied in soil stabilization

Surfactants for dispersion of carbon nanotubes applied in soil stabilization

Transport Properties of Carbon-Nanotube/Cement Composites

Technogenic resources for nanotechnologies in construction

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