Influence of Carbon Nanotubes on Phase Composition, Thermal and Post-Heating Behavior of Cementitious Composites

Irshidat, Mohammad R.; Al‐Nuaimi, Nasser; Rabie, Mohamed

doi:10.3390/molecules26040850

Cited by 10 publications

(4 citation statements)

References 33 publications

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“…The speed of strength development of cement mixtures is controlled by adding accelerators [ 3 , 4 , 5 ] or retarders [ 5 , 6 , 7 ] but also admixtures such as silica fume [ 8 ] or carbon nanotubes [ 9 ]. Note, however, that choosing the correct type and amount of accelerator, retarder or admixture is a difficult task.…”

Section: Introductionmentioning

confidence: 99%

The Effect of an Accelerator on Cement Paste Capillary Pores: NMR Relaxometry Investigations

Ardelean

2021

Molecules

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Nuclear Magnetic Resonance (NMR) relaxometry is a valuable tool for investigating cement-based materials. It allows monitoring of pore evolution and water consumption even during the hydration process. The approach relies on the proportionality between the relaxation time and the pore size. Note, however, that this approach inherently assumes that the pores are saturated with water during the hydration process. In the present work, this assumption is eliminated, and the pore evolution is discussed on a more general basis. The new approach is implemented here to extract information on surface evolution of capillary pores in a simple cement paste and a cement paste containing calcium nitrate as accelerator. The experiments revealed an increase of the pore surface even during the dormant stage for both samples with a faster evolution in the presence of the accelerator. Moreover, water consumption arises from the beginning of the hydration process for the sample containing the accelerator while no water is consumed during dormant stage in the case of simple cement paste. It was also observed that the pore volume fractal dimension is higher in the case of cement paste containing the accelerator.

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Section: Introductionmentioning

confidence: 99%

The Effect of an Accelerator on Cement Paste Capillary Pores: NMR Relaxometry Investigations

Ardelean

2021

Molecules

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“…This was credited to the extension of internal cracks caused by the extreme addition of CNTs. The research noted improvement in the compressive and flexural strength of CNT-reinforced cementitious composites subjected to temperatures up to 600 •C [104]. This was because of the positive impact of CNTs on the hydration process.…”

Section: Durabilitymentioning

confidence: 90%

Role of Carbon Nanotubes in Expanding the Properties of Cement-Based Composites for Construction: An Overview

Katar

2023

NHC

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Carbon nanotubes (CNTs) have been studied as a reinforcement material for cementitious composites, with promising results. Incorporating CNTs into cement-based materials enhances the composites' mechanical, thermal, and electrical properties, as cementitious materials have limited applications due to their strain capacity and less tensile strength. CNTs have high tensile strength and modulus, along with excellent electrical conductivity. These features make them ideal for construction materials. Using CNTs in cement-based composites can improve the durability and sustainability of construction materials and provide new opportunities for advanced applications in the construction industry. The addition of CNTs to cement-based materials can improve mechanical performance, improve fire resistance and reduce carbon dioxide emissions. The incorporation of CNTs in cementitious composites is a promising area of research with significant potential for use in the construction industry. The current study's findings are expected to provide insight into the new material and its glamorous scopes for application as construction materials.

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“…Figure 6c shows a microscopic photograph of doped carbon nanotubes, and the carbon nanotubes exhibit uniform dispersion in the cementitious material; the nanotubes are interspersed between the cementitious materials and not entangled. According to this analysis, carbon nanotubes act as nucleation sites for hydration products in the matrix of the gelling material and as connections with the loose C-S-H gel, thus forming a dense hydride [41][42][43]. In addition, carbon nanotubes play a bridging role in the matrix, lap at the matrix cracks, and effectively prevent the occurrence and expansion of cracks.…”

Section: Analysis Of the Microscopic Enhancement Mechanismmentioning

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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Influence of Carbon Nanotubes on Phase Composition, Thermal and Post-Heating Behavior of Cementitious Composites

Cited by 10 publications

References 33 publications

The Effect of an Accelerator on Cement Paste Capillary Pores: NMR Relaxometry Investigations

The Effect of an Accelerator on Cement Paste Capillary Pores: NMR Relaxometry Investigations

Role of Carbon Nanotubes in Expanding the Properties of Cement-Based Composites for Construction: An Overview

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

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