The influence of multi-walled carbon nanotubes additive on properties of non-autoclaved and autoclaved aerated concretes

Kerienė, Jadvyga; Kligys, Modestas; Laukaitis, A.; Yakovlev, Grigory; Špokauskas, Algimantas; Aleknevičius, Marius

doi:10.1016/j.conbuildmat.2013.08.044

Cited by 56 publications

(14 citation statements)

References 17 publications

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“…As a result, the resulting nano-core can form not only load-transfer chain but also electrical conductive pathway, providing multifunctional/smart ability to cementitious composites [18,[42][43][44][45]. Additionally, the thermal conductivity of cementitious composites decreases and the resistance thermal distortion increases because of the presence of carbon nano-core [46,47].…”

Section: Filling or Bonding Effectmentioning

confidence: 99%

Nano-core effect in nano-engineered cementitious composites

Han

Zhang

Zeng

et al. 2017

Composites Part A: Applied Science and Manufacturing

285

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Nanoscale impact can bring big changes in micro-meso-macroscale behaviors of the composites. addition of nano fillers makes cementitious materials stronger, more durable and multifunctional/smart. This paper aims at investigating the underlying mechanism for understanding and controlling the nano-engineered cementitious composites. The nano-core effect is proposed through integrating core-effect with nano effect, and is proved by experimental evidences for the cementitious composites with different nano fillers. The nano-core effect is closely relative to the intrinsic properties of nano fillers, composition and processing of the cementitious composites. The behaviors of the nano-engineered cementitious composites are governed by nano-core effect zone, i.e. nano-core-shell element. It is therefore concluded that the nano-core effect is fundamental for design, fabrication and application of the nano-engineered cementitious composites.

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Section: Filling or Bonding Effectmentioning

confidence: 99%

Nano-core effect in nano-engineered cementitious composites

Han

Zhang

Zeng

et al. 2017

Composites Part A: Applied Science and Manufacturing

285

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“…Cement paste reinforced with MWCNTs exhibits higher Young's modulus than plain sample in all cases, and the amount of high stiffness C-S-H is increased by the incorporation of MWCNTs. It can be deduced that MWCNTs are effective in filling the areas 6 Advances in Materials Science and Engineering Kerienė et al [165] in C-S-H [24,99]. Recently, three-point flexural bending tests were performed to evaluate Young's modulus of the cement/CNTs composites at ages of 7, 14, and 28 days, and Young's modulus increased as the short-MWCNTs' concentration is increasing; moreover, low concentrations of long-MWCNTs could lead to a much higher increase in Young's modulus as compared to higher concentrations of short MWCNTs [95].…”

Section: Young's Modulus and Porositymentioning

confidence: 99%

Progress in Research on Carbon Nanotubes Reinforced Cementitious Composites

Liu

2015

Advances in Materials Science and Engineering

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As one-dimensional (1D) nanofiber, carbon nanotubes (CNTs) have been widely used to improve the performance of nanocomposites due to their high strength, small dimensions, and remarkable physical properties. Progress in the field of CNTs presents a potential opportunity to enhance cementitious composites at the nanoscale. In this review, current research activities and key advances on multiwalled carbon nanotubes (MWCNTs) reinforced cementitious composites are summarized, including the effect of MWCNTs on modulus of elasticity, porosity, fracture, and mechanical and microstructure properties of cement-based composites. The issues about the improvement mechanisms, MWCNTs dispersion methods, and the major factors affecting the mechanical properties of composites are discussed. In addition, large-scale production methods of MWCNTs and the effects of CNTs on environment and health are also summarized.

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“…Technical papers provide a strategy for increasing the FC’s mechanical properties by adding fibres of diverse nature and various contents, embedded in the cement matrix [ 18 , 23 ]. Fibre-reinforced concrete has micro- and nano-fibres, which ensure the strengthening of the microstructure even in thinner cell walls [ 25 ]. Fibres existence increases FC’s flexural strength and effectively reduces shrinkage loads [ 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Fibre-Reinforced Foamed Concretes: A Review

et al. 2020

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Foamed concrete (FC) is a high-quality building material with densities from 300 to 1850 kg/m3, which can have potential use in civil engineering, both as insulation from heat and sound, and for load-bearing structures. However, due to the nature of the cement material and its high porosity, FC is very weak in withstanding tensile loads; therefore, it often cracks in a plastic state, during shrinkage while drying, and also in a solid state. This paper is the first comprehensive review of the use of man-made and natural fibres to produce fibre-reinforced foamed concrete (FRFC). For this purpose, various foaming agents, fibres and other components that can serve as a basis for FRFC are reviewed and discussed in detail. Several factors have been found to affect the mechanical properties of FRFC, namely: fresh and hardened densities, particle size distribution, percentage of pozzolanic material used and volume of chemical foam agent. It was found that the rheological properties of the FRFC mix are influenced by the properties of both fibres and foam; therefore, it is necessary to apply an additional dosage of a foam agent to enhance the adhesion and cohesion between the foam agent and the cementitious filler in comparison with materials without fibres. Various types of fibres allow the reduction of by autogenous shrinkage a factor of 1.2–1.8 and drying shrinkage by a factor of 1.3–1.8. Incorporation of fibres leads to only a slight increase in the compressive strength of foamed concrete; however, it can significantly improve the flexural strength (up to 4 times), tensile strength (up to 3 times) and impact strength (up to 6 times). At the same time, the addition of fibres leads to practically no change in the heat and sound insulation characteristics of foamed concrete and this is basically depended on the type of fibres used such as Nylon and aramid fibres. Thus, FRFC having the presented set of properties has applications in various areas of construction, both in the construction of load-bearing and enclosing structures.

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The influence of multi-walled carbon nanotubes additive on properties of non-autoclaved and autoclaved aerated concretes

Cited by 56 publications

References 17 publications

Nano-core effect in nano-engineered cementitious composites

Nano-core effect in nano-engineered cementitious composites

Progress in Research on Carbon Nanotubes Reinforced Cementitious Composites

Fibre-Reinforced Foamed Concretes: A Review

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