Experimental Investigation on Effect of Carbon Nanotubes and Carbon Fibres on the Behavior of Plain Cement Mortar Composite Round Bars under Direct Tension

Hunashyal, Anand M.; Tippa, Sagar V.; Quadri, S. S.; Banapurmath, N.R.

doi:10.5402/2011/856849

Cited by 46 publications

(25 citation statements)

References 8 publications

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“…Manzur and Yazdani [17] in 2010 observed increase in compressive strength of cement mortar through addition of two different sizes of untreated commercial MWNT. Hunashyal et al [18] in 2011 obtained higher tensile strength and better stress-strain relationship in direct tension for cement samples with CNT. Han et al [19] in 2013 showed that addition of MWNT could decrease both water sorptivity and permeability coefficient of CNT reinforced cement-based materials.…”

Section: Introductionmentioning

confidence: 97%

Potential of Carbon Nanotube Reinforced Cement Composites as Concrete Repair Material

Manzur

Yazdani

Emon

2016

Journal of Nanomaterials

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Carbon nanotubes (CNTs) are a virtually ideal reinforcing agent due to extremely high aspect ratios and ultra high strengths. It is evident from contemporary research that utilization of CNT in producing new cement-based composite materials has a great potential. Consequently, possible practical application of CNT reinforced cementitious composites has immense prospect in the field of applied nanotechnology within construction industry. Several repair, retrofit, and strengthening techniques are currently available to enhance the integrity and durability of concrete structures with cracks and spalling, but applicability and/or reliability is/are often limited. Therefore, there is always a need for innovative high performing concrete repair materials with good mechanical, rheological, and durability properties. Considering the mechanical properties of carbon nanotubes (CNTs) and the test results of CNT reinforced cement composites, it is apparent that such composites could be used conveniently as concrete repair material. With this end in view, the applicability of multiwalled carbon nanotube (MWNT) reinforced cement composites as concrete repair material has been evaluated in this study in terms of setting time, bleeding, and bonding strength (slant shear) tests. It has been found that MWNT reinforced cement mortar has good prospective as concrete repair material since such composites exhibited desirable behavior in setting time, bleeding, and slant shear.

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Section: Introductionmentioning

confidence: 97%

Potential of Carbon Nanotube Reinforced Cement Composites as Concrete Repair Material

Manzur

Yazdani

Emon

2016

Journal of Nanomaterials

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“…In cement composites, carbon fibers (CFs) can be applied alone or in combination with carbon nanotubes. The behavior of reinforced cement mortar composites round bars with MWCNTs (0.5 wt%; diameter 10-30 nm, length 1-2 μm, surface area 350 m 2 /g) and CFs (2.25 wt%; length of fiber 5 mm, fiber thickness 0.3 mm), ultrasonically dispersed in the cement matrix, was elucidated [27]. Composite round bars were tested under direct tension, in order to evaluate their mechanical properties, such as ultimate load, deflection criteria, and stressstrain behavior.…”

Section: Improvement Of Concrete Properties By Addition Of Cnts and Cnfsmentioning

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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“…The particle size of the filler can be optimally selected so that the filler can increase the hydration reaction, but not significantly affect the dimensional stability of the cement system. The addition of small non-reactive filler to the cement modifies the hydration reaction mainly due to dilution, modification of particle size distribution, and heterogeneous nucleation [8,9].…”

Section: Introductionmentioning

confidence: 99%

Influence of Fine Additives and Surfactants on the Strength and Permeability Degree of Concrete

Шкромада

Paliy

Yurchenko

et al. 2020

EUREKA: Physics and Engineering

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The results of studies to determine the effect of titanium dioxide nanoparticles (nanoTiO 2 ), finely dispersed anatase crystalline titanium dioxide (anatazTiO 2 ) and surface-active substances (surfactants) on the compressive strength, degree of permeability and thermal stability of concrete samples are presented. Adding particles of nanotitanium, anatase titanium and surfactants up to 2 % to cement accelerates the hydration process and increases the strength of concrete, and also has a strong effect on its microstructure.As a result of the studies, it is experimentally proved that the compressive strength of concrete increases with the addition of titanium dioxide (nanoTiO 2 ) nanoparticles by 23.2 %, finely dispersed anatase crystalline titanium dioxide (anatazTiO 2 ) by 21.7 % to 5 % concentration by weight. Original Research Article: full paper (2020), «EUREKA: Physics and Engineering» Number 2 20Chemical EngineeringIn addition, the introduction of these additives reduces the permeability of concrete. This is due to a decrease in the absorption of concrete by water with the addition of nanotitanium and anatase titanium. The introduction of additives from 1 % to 5 % by weight in concrete reduces the depth of chloride penetration by 10-15 times, compared with the control.The use of temperature-programmed desorption mass spectrometry (TPD-MS) method has shown that an increase in the percentage of TiO 2 nanoparticles to 5 % in concrete mixtures correlates with an increase in microporosity and dispersion level of these mixtures, which causes a shift in the peaks of intense gas evolution from the samples when heated to the side low temperatures (for example, carbon dioxide CO 2 ).The resulting concrete samples are planned to be used for the manufacture of floors in livestock buildings. The injected additives are selected because they are not toxic substances and, in contact with the biological environment of livestock buildings (urine, feces), will not react with them.

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Experimental Investigation on Effect of Carbon Nanotubes and Carbon Fibres on the Behavior of Plain Cement Mortar Composite Round Bars under Direct Tension

Cited by 46 publications

References 8 publications

Potential of Carbon Nanotube Reinforced Cement Composites as Concrete Repair Material

Potential of Carbon Nanotube Reinforced Cement Composites as Concrete Repair Material

Recent Trends of Reinforcement of Cement with Carbon Nanotubes and Fibers

Influence of Fine Additives and Surfactants on the Strength and Permeability Degree of Concrete

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