Experimental study on physical and mechanical properties and micro mechanism of carbon nanotubes cement-based composites

Zhang, Huadi; Kan, Deyuan; Tang, Shuangshuang; Chen, Zhengfa

doi:10.1080/1536383x.2022.2088737

Cited by 10 publications

(3 citation statements)

References 24 publications

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“…The cement-to-water ratio was chosen to be 0.4, based on earlier experiments of the Authors. This value was also observed to provide high compressive strength in combination with 0.1%wt of MWCNTs [24].…”

Section: Methodsmentioning

confidence: 72%

Is Cement Paste Modified with Carbon Nanomaterials Capable of Self-Repair after a Fire?

Rajczakowska

Szeląg

Habermehl-Cwirzen

et al. 2022

Nordic Concrete Research

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This manuscript presents preliminary results on the cement paste potential, with and without carbon nanomaterials, to heal high-temperature cracks. Cement paste beams were subjected to thermal loading of 200°C and 400°C after 28 days of water curing. High temperature caused the formation of microcrack networks on the specimen’s surface. Self-healing was achieved by exposing the cracked samples to cyclic water immersion. The efficiency of the process was evaluated based on the crack closure and mechanical properties recovery after 24 days. The results indicated a distinct dependence of the healing on the loading temperature. Carbon nanotubes had a positive effect on self-repair efficiency.

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Section: Methodsmentioning

confidence: 72%

Is Cement Paste Modified with Carbon Nanomaterials Capable of Self-Repair after a Fire?

Rajczakowska

Szeląg

Habermehl-Cwirzen

et al. 2022

Nordic Concrete Research

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“…However, the performance of aluminum alloys still fails to meet the requirements of higher strength parts, and thus, the development of high-strength aluminum matrix composites is particularly urgent [1][2][3][4]. CNTs, because of their distinctive structure and excellent mechanical properties, such as low density, very high strength and toughness, high Young's modulus and tensile strength, good thermal conductivity, good electrical conductivity, etc., are considered to be ideal for nanoscale reinforcement of aluminum matrix composites [5][6][7]. Many scholars have prepared CNT-reinforced aluminum matrix composites using various methods, such as the powder metallurgy method [8], high-energy ball milling method [9], and in situ synthesis method [10].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Cu-CoatedCarbon-Nanotubes-Reinforced Aluminum Matrix Composites Fabricated by Ultrasonic-Assisted Casting

Dong,

Zeng,

Yan

2024

Metals

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Carbon nanotubes (CNTs) are considered ideal nanoscale reinforcement for the development of high-performance metal matrix composites due to their unique structure and excellent mechanical properties. However, CNTs are easy to agglomerate and have poor wettability with the aluminum matrix, resulting in unsatisfactory effects when added to the aluminum melt. In this study, Cu-coated carbon nanotubes (Cu@CNTs)-reinforced aluminum matrix composites were fabricated by high-energy ultrasonic-assisted casting. Moreover, the effects of different Cu@CNTs content on the microstructure and mechanical properties of aluminum matrix composites were explored. Meanwhile, Fluent 19.0 software was used to further explore the function of ultrasonic vibration in the melt. The results demonstrated that the mechanical properties of composite with 1.2 wt% Cu@CNTs are optimal. Compared with the matrix, the composite with 1.2 wt% Cu@CNTs displayed a 39.3% increase in yield strength, 53.5% increase in ultimate tensile strength, and 5.7% increase in elongation. The simulation results showed that the uniform dispersion of Cu@CNTs and grain refinement can be attributed to the acoustic streaming effect and cavitation effect of high-energy ultrasound. The improvement of the properties of the composites can be attributed to the grain refinement and the load-bearing effect of CNTs.

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“…Liu [27] incorporated 0%, 0.05%, 0.08%, 0.10%, 0.15%, 0.20%, and 0.30% mass replacement proportions of MWCNTs at water-cement ratios of 0.25, 0.3, 0.35, and 0.4. The experimental results show that under a fixed water-cement ratio, with increasing CNT doping, the compressive and flexural strengths of the cementitious composites first increase and then decrease.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of the Mechanical Properties and Mix Proportion of Multiscale-Fibre-Reinforced Engineered Cementitious Composites

Yang,

Wang,

Chen

et al. 2023

Polymers

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Engineered cementitious composites (ECCs) are cement-based composite materials with strain-hardening and multiple-cracking characteristics. ECCs have multiscale defects, including nanoscale hydrated silicate gels, micron-scale capillary pores, and millimetre-scale cracks. By using millimetre-scale polyethylene (PE) fibres, microscale calcium carbonate whiskers (CWs), and nanoscale carbon nanotubes (CNTs) as exo-doped fibres, a multiscale enhancement system was formed, and the effects of multiscale fibres on the mechanical properties of ECCs were tested. The Box-Behnken experimental design method, which is a response surface methodology, was used to construct a quadratic polynomial regression equation to optimise ECC design and provide an optimisation of ECC mix proportions. The results of this study showed that a multiscale reinforcement system consisting of PE fibres, CWs, and CNTs enhanced the mechanical properties of ECCs. CWs had the greatest effect on the compressive strengths of highly ductile-fibre-reinforced cementitious composites, followed by CNTs and PE fibres. PE fibres had the greatest effect on the flexural and tensile strengths of high-ductility fibre-reinforced cementitious composites, followed by CWs and CNTs. The final optimisation results showed that when the ECC matrix was doped with 1.55% PE fibres, 2.17% CWs, and 0.154% CNTs, the compressive strength, flexural strength, and tensile strength of the matrix were optimal.

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Experimental study on physical and mechanical properties and micro mechanism of carbon nanotubes cement-based composites

Cited by 10 publications

References 24 publications

Is Cement Paste Modified with Carbon Nanomaterials Capable of Self-Repair after a Fire?

Is Cement Paste Modified with Carbon Nanomaterials Capable of Self-Repair after a Fire?

Microstructure and Mechanical Properties of Cu-CoatedCarbon-Nanotubes-Reinforced Aluminum Matrix Composites Fabricated by Ultrasonic-Assisted Casting

Optimisation of the Mechanical Properties and Mix Proportion of Multiscale-Fibre-Reinforced Engineered Cementitious Composites

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