Multi-walled carbon nanotube reinforced mortar-aggregate interfacial properties

Song, Xiaoqian; Shang, Susu; Chen, Dandan; Gu, Xianglin

doi:10.1016/j.conbuildmat.2016.12.034

Cited by 28 publications

(5 citation statements)

References 22 publications

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“…In the recent studies, researchers used combination of sonication (bath or probe type) with functionalization (by surfactant or oxidation) for the dispersion of CNTs within the cementitious composites. However, conflicting results were found in the literature, for instance [18][19][20][21] reported improvement in mechanical properties and [22][23][24] reported reduction in mechanical properties with addition of CNT. Inconsistency in the results reveals that use of dispersion technique plays an important role to achieve the best and consistence result of CNTs reinforced cementitious composites.…”

Section: Introductionmentioning

confidence: 99%

Cementitious composites incorporating Multi-Walled Carbon Nanotubes (MWCNTs): effects of annealing and other dispersion methods on the electrical and mechanical properties

Shahzad

Toumi

Balayssac

et al. 2022

Matériaux & Techniques

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This study focuses on different techniques for dispersing Multi-Walled Carbon Nanotubes (MWCNTs) in cementitious materials. The impact of dispersion is observed through electrical resistivity and mechanical properties of cementitious composites. Two contents (0.5 and 1% by mass of cement) of MWCNTs are investigated and three different techniques were used to disperse CNTs in water by sonication: (i) pristine, P-CNT, (ii) functionalized carbon nanotubes by classical approach (dispersive agent, D-CNT), and (iii) by an innovative approach (annealing, A-CNT). Self-sensing response of the material under cyclic compressive loading is measured with Wheatstone Bridge (WSB) circuit. Results showed a detrimental effect of dispersive agent on the resistivity and mechanical properties of cementitious composites irrespective of the content of CNTs. However, the impact of P-CNT and A-CNT on the reduction of mechanical properties is slight. With the use of 1% content of A-CNTs, a stable resistivity response of the material is observed irrespective of the saturation degree. This indicates that content higher than 1% of A-CNTs is not required for the development of smart cementitious composites for structural health monitoring (SHM). The test results of self sensing measurements indicate a poor repeatability of the electrical response for plain mortar under each loading cycle while, stable response is noticed with specimens incorporating 1% of A-CNTs. The maximum variation in fractional change in voltage (FCV) shown by plain mortar is 6.3% indicating high electrical resistance of plain mortar, while in case of mortar containing 1% A-CNTs, variation in FCV is 35% indicating lower electrical resistance and better sensitivity of the material.

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Section: Introductionmentioning

confidence: 99%

Cementitious composites incorporating Multi-Walled Carbon Nanotubes (MWCNTs): effects of annealing and other dispersion methods on the electrical and mechanical properties

Shahzad

Toumi

Balayssac

et al. 2022

Matériaux & Techniques

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“…It exhibits extraordinary strength (tensile strength in the range of GPa) and modulus of elasticity in the order of TPa, in addition to having unique electronic and chemical properties [1]. As a result, several works showed that CNTs improved the compressive strength [6]- [10], tensile/flexural strength [7], [11]- [14], and modulus of elasticity [8], [15] of cementitious composite. In addition, CNTs may improve the durability of composite mainly by reducing the porosity of the cementitious matrix [10], [16]- [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Carbon Nanotubes (CNTs) aspect ratio on the rheology, thermal conductivity and mechanical performance of Portland cement paste

Batiston

Gleize

Mezzomo

et al. 2021

Rev. IBRACON Estrut. Mater.

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Carbon nanotubes (CNTs) are potential candidates to enhance the heat balance of concrete, reducing internal stresses caused by differential heating in massive concrete elements. The higher the aspect ratio (AR) and content of CNTs, the greater the expected thermal conductivity (TC). However, high AR may impair the proper dispersion of CNTs in cementitious matrix, potentially harming the workability and mechanical strength of the composite. This work evaluated the effect of the AR (35, 250, 900, and 3500) and content (0.05% and 0.10%) of CNTs on the TC, rheology (squeeze flow), and mechanical strength of cement paste. Results showed that 0.05% CNT increased the TC of paste by up to 15% for AR of 250, but further increasing AR progressively reduced the TC of the composite. In turn, 0.10% CNT incorporation did not result in significant TC gains. The yield stress and viscosity of the mixes progressively increased as CNTs content and AR increased, by up to 119% compared with plain cement paste. No significant differences were observed in 28-day compressive strength with 0.05% CNT incorporation, while 0.10% CNT led to slight strength reductions for some mixes. Regarding flexural strength, 0.05% incorporation of either CNT decreased the strength of the mixes while 0.10% incorporation generally compensated this reduction, except for the lowest aspect ratio. Overall, CNTs with intermediate AR (around 250) was effective in improving the thermal conductivity of cement paste, increasing it by 15% with relatively low content (0.05%) while did not significantly impair the fresh and mechanical performance of the composite.

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“…At this stage, the reasons for investigating the effect of such materials on cement paste only is the simplicity of capturing or tracking the nanofilaments' dispersion within the matrix compared to mortars and concrete, and the large costs of preparing concrete using the nanofilaments. Few studies investigated the effect of adding carbon nanofilament on the properties of mortar [15,[25][26][27]. Several mixing procedures and mix proportions were proposed.…”

Section: Introductionmentioning

confidence: 99%

Carbon Nanotube Effect on the Ductility, Flexural Strength, and Permeability of Concrete

Mohsen

Ansari

Taha³

et al. 2019

Journal of Nanomaterials

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Recently, remarkable types of carbon nanofilaments called carbon nanotubes (CNTs) have raised the interest of many concrete and cementitious composite researchers due to their significant mechanical, electrical, thermal, kinetic, and chemical properties. These nanofilaments are considered promising applicants to use in producing high-performance cement-based composite materials. In this research, the effect of CNT use on the flexural strength, strain capacity, permeability, and microstructure of concrete was investigated. Concrete batches of 0, 0.03, 0.08, 0.15, and 0.25 wt.% CNTs were prepared using a mixing method that consisted of a 30-minute solution sonication and a 60-minute batch mixing. On the 28th day, the mechanical properties were determined. The results indicated that concrete prepared using high CNT contents of 0.15 and 0.25 wt.% increased the flexural strength by more than 100% in comparison with 0% CNT concrete. Furthermore, the results showed that CNTs would increase the ductility of concrete beams by about 150%. The permeability test results showed the benefits of CNT inclusion in reducing the permeability of concrete. The permeability coefficient (kT) decreased by at least 45% when CNTs were added to concrete. A qualitative microstructural analysis illustrated the uniform dispersion of CNT filaments within the concrete hydration products in all batches.

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Multi-walled carbon nanotube reinforced mortar-aggregate interfacial properties

Cited by 28 publications

References 22 publications

Cementitious composites incorporating Multi-Walled Carbon Nanotubes (MWCNTs): effects of annealing and other dispersion methods on the electrical and mechanical properties

Cementitious composites incorporating Multi-Walled Carbon Nanotubes (MWCNTs): effects of annealing and other dispersion methods on the electrical and mechanical properties

Effect of Carbon Nanotubes (CNTs) aspect ratio on the rheology, thermal conductivity and mechanical performance of Portland cement paste

Carbon Nanotube Effect on the Ductility, Flexural Strength, and Permeability of Concrete

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