Effect of multi-walled carbon nanotubes on mechanical properties of high-performance mortar

Sahranavard, Saeed; Haji-Kazemi, Hasan; Abbasi, Sedigheh

doi:10.1680/macr.14.00037

Cited by 15 publications

(8 citation statements)

References 18 publications

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“…It has been shown that adding even a small quantity of carbon nanotubes one can achieve a percolation threshold at which electrical conductivity, and so shielding effectiveness, significantly increases. In [25] it was found that an addition of multilayer wall carbon nanotubes to high-strength mortar affected the latter's compressive strength (which increased by 25-58%), impact strength (which increased by 1400%) and three-point bending strength (which increased by 2%). Unfortunately, in [25] the error bars were not given what would have been especially important in the case of so small growth of the three-point bending strength.…”

Section: Graphite Content By Volume (%)mentioning

confidence: 99%

“…In [25] it was found that an addition of multilayer wall carbon nanotubes to high-strength mortar affected the latter's compressive strength (which increased by 25-58%), impact strength (which increased by 1400%) and three-point bending strength (which increased by 2%). Unfortunately, in [25] the error bars were not given what would have been especially important in the case of so small growth of the three-point bending strength. The above values are for the nanotubes content of 0.1% relative to the cement mass.…”

Section: Graphite Content By Volume (%)mentioning

confidence: 99%

“…Many research on the protection of built structures against microwave radiation, e.g., [25], are devoted to the use of graphene, mainly in the form of cladding, for this purpose. In particular, graphene is used as:…”

Section: Graphite Content By Volume (%)mentioning

confidence: 99%

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Methods of Protecting Buildings against HPM Radiation—A Review of Materials Absorbing the Energy of Electromagnetic Waves

et al. 2020

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The pulsed high power microwave (HPM) technology has been developed worldwide for over 20 years. The sources of HPM pulses are a weapon of mass destruction. They pose danger especially to computer and telecommunications equipment and systems, both the military and civilian ones. This paper presents a survey of literature on electromagnetic wave radiation absorbing and shielding materials to be used in construction. Relevant protective measures should include the shielding of buildings or their parts and the absorption of radiation by building envelopes and their elements. The main focus is on the possibilities of improving the shielding and absorptive properties of common construction materials, such as concrete, mortars and synthetic resins. The survey covers the following groups of materials: carbon-based admixtures, nickel powder, iron powders, ferrites, magnetite and polymers. The final part of the survey is devoted to hybrid foam microwave absorbers in which the shape of the material’s inner structure and that of its surface play a special role.

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Section: Graphite Content By Volume (%)mentioning

confidence: 99%

Section: Graphite Content By Volume (%)mentioning

confidence: 99%

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Methods of Protecting Buildings against HPM Radiation—A Review of Materials Absorbing the Energy of Electromagnetic Waves

et al. 2020

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“…-OH and -COOH functionalized CNTs have distinct physical properties and are more hydrophilic in comparison with pristine CNTs, so their effects on concrete properties can be different. The influence of functionalized MWCNT-OH and MWCNT-COOH on the impact resistance and compressive and flexural strengths of high-performance mortars (HPM) was studied [30]. The results of tests on reinforced high-performance mortar containing 0.1 wt% functionalized MWCNTs showed that the impact resistance, compressive strength, and flexural strength were 1400, 25.58, and 2% higher than those of HPM without MWCNTs.…”

Section: Effects Of Cnt Functionalization Annealing Concentration mentioning

confidence: 99%

Recent Trends of Reinforcement of Cement with Carbon Nanotubes and Fibers

Kharissova¹,

Martínez²,

Kharisov³

2016

Advances in Carbon Nanostructures

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Recent achievements in the area of formation of carbon nanotubes (CNTs), nanocomposites, with cement are reviewed. The peculiarities of dispersion of CNTs in cementitious matrices are discussed, paying major attention to the CNT diameter, length and length-to-diameter ratio, concentration, functionalization, annealing, combination with other nanomaterials, and water-cement ratio. Several effects upon dispersion of carbon allotropes in concrete-water media are emphasized. It is also pointed out that the health impact should also be considered in further experiments on construction materials reinforced with CNTs.

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“…2,5 Typical properties for a singlelayered porous bearing working at 5-15 mm air gap are: porosity level between 20% and 35%, permeability coefficient between 6.5 Â 10 À16 and 8.4 Â 10 À14 m 2 and flexural strength around 35 MPa. 2,5,8 Improvements in the physical and mechanical properties of a cementitious composite have been conducted towards the incorporation of fine and stiff particles/ fibres, 2,5,[9][10][11] and mineral/chemical admixtures, 9,12,13 in addition to alternative manufacturing techniques such as high uniaxial cold/hot pressing, 14,15 high temperature [13][14][15] and autoclaving 10,16 cures.…”

Section: Introductionmentioning

confidence: 99%

Assessment of compacted-cementitious composites as porous restrictors for aerostatic bearings

Missagia

Santos

Silva

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part L:

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Cementitious composites reinforced with silica, silicon carbide or carbon microfibres are designed, manufactured, characterised and tested as porous restrictor for aerostatic bearings. Carbon microfibres are residues obtained from the cutting process of carbon fibre-reinforced polymers. Porosity, permeability, flexural strength and stiffness are quite relevant in the design of aerostatic porous bearings. A 3141 full factorial design is carried out to identify the effects of particle inclusion and water-to-cement ratio(w/c) factors on the physical and mechanical properties of cementitious composites. Higher density material is achieved by adding silicon carbide. Higher porosity is obtained at 0.28 w/c level when silica and silicon carbide are used. Carbon microfibres are not effective under bending loads. Higher compressive strength is reached especially when silica particles are combined with 0.33 or 0.35 w/c. According to the permeability coefficient values the cementitious composites consisted of CMF (0.28 w/c), silica (0.30 w/c) or silicon carbide (0.30 w/c) inclusions are promising as porous restrictor; however, carbon microfibre porous bearings achieved the lowest air gap variation under the tested working conditions.

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Effect of multi-walled carbon nanotubes on mechanical properties of high-performance mortar

Cited by 15 publications

References 18 publications

Methods of Protecting Buildings against HPM Radiation—A Review of Materials Absorbing the Energy of Electromagnetic Waves

Methods of Protecting Buildings against HPM Radiation—A Review of Materials Absorbing the Energy of Electromagnetic Waves

Recent Trends of Reinforcement of Cement with Carbon Nanotubes and Fibers

Assessment of compacted-cementitious composites as porous restrictors for aerostatic bearings

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