Electrical resistance of carbon-nanofiber concrete

Gao, Di; Sturm, Mariel; Mo, Y. L.

doi:10.1088/0964-1726/20/4/049501

Cited by 32 publications

(18 citation statements)

References 10 publications

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“…The ERV was comparatively steady when the fibre concentration was 0.75% and 1.0% and the maximum ERV for these were 0.17 and 0.19 respectively. This was close to the values found in the literature (Gao et al, 2009) for SCC where using CNF fibres at 0.70%, 1.0% and 2.0% lead to a maximum ERV value of 0.20, 0.21 and 0.25 respectively. In another study (Camacho-Ballesta et al, 2016), the maximum ERV for 0.25% and 0.5% CNT cement paste was 0.05 and 0.14 respectively which are close to the values found in this study for 0.25% CNF (ERVmax= 0.06) and 0.5% CNF (ERVmax= 0.13) in concrete.…”

Section: Electrical Resistance Variation (Erv)supporting

confidence: 90%

“…In the review of the previous work on the compressive strength of CNF composites, it was found that 1.0% CNF by volume of binder increases the cylinder compressive strength by 26.9% (Sivakumar, 2011) which was lower than what was achieved in this research. However, Gao et al (2009) found that the addition of 0.16% CNF to a self-consolidating concrete (SCC) increases the compressive strength by 40%. The reason for higher enhancement found by them could be the type of the concrete used in their study, suggesting that SCC could possibly better accommodate the dispersion of the fibres when mixed with the cementitious materials and hence achieving a more uniform mixture because of its higher fluidity (due to higher HRWR and water content) resulting in higher strength increase.…”

Section: Compression Test Resultsmentioning

confidence: 99%

“…It was concluded that the best combination for compressive and flexural strength production was CNF composites (0.1%-0.2%) with w/c ratio of 0.35. Gao et al (2009) investigated the mechanical properties of concrete and Self-Consolidating Concrete (SCC) containing 0.16%-2.5% CNF by volume of binder. The cylinder compressive strength of the concrete was increased by 42.7% for 0.16% CNF concentration.…”

Section: Cnt/cnfmentioning

confidence: 99%

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Mechanical and self-sensing properties of concrete reinforced with carbon nanofibres

Faghih

Ayoub

2021

Advances in Cement Research

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Concrete is extensively used in the construction industry; however formation and development of cracks undermines the integrity of the structure. Thus, both improving the mechanical properties of this material as well as efficient health monitoring of structures are essential tasks to be tackled. The research covered in this paper is concerned with the effect of nano fibres on the mechanical properties of concrete. The use of nano fibres such as Carbon Nanofibre (CNF) within cementitious materials is found to be effective in enhancing the mechanical properties of concrete as well as its sensing ability. Most previous work focused on evaluating the micro-structure and mechanical behaviour of nano-reinforced mortar. Only a few studies attempted to evaluate the mechanical and sensing properties of nano-reinforced concrete with coarse aggregates. The objective of this study is to fill this gap in the literature by evaluating the mechanical and selfsensing properties of Carbon Nanofibre concrete. Material tests were conducted on cylinders and beam samples of CNF concrete in order to develop the full compressive, tensile, and flexural constitutive behaviour including the post-peak response, as well as evaluate its self-sensing capability. The results obtained are valuable for analysis and design of large critical infrastructures employing CNF concrete.

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Section: Electrical Resistance Variation (Erv)supporting

confidence: 90%

Section: Compression Test Resultsmentioning

confidence: 99%

Section: Cnt/cnfmentioning

confidence: 99%

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Mechanical and self-sensing properties of concrete reinforced with carbon nanofibres

Faghih

Ayoub

2021

Advances in Cement Research

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“…It was concluded that the best combination for compressive and flexural strength production was CNF composites (0.1%-0.2%) with w/c ratio of 0.35. Gao et al [12] investigated the mechanical properties of concrete and Self-Consolidating Concrete (SCC) containing 0.16%-2.5% CNF by volume of binder. The cylinder compressive strength of the concrete was increased by 42.7% for 0.16% CNF concentration.…”

Section: Introductionmentioning

confidence: 99%

Structural performance of steel-concrete sandwich beams with carbon nanofiber reinforcement

Faghih

Ayoub

2019

Engineering Structures

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Citation: Faghih, F. and Ayoub, A. ORCID: 0000-0002-2670-9662 (2019). Structural performance of steel-concrete sandwich beams with carbon nanofiber reinforcement. AbstractCementitious materials such as concrete are typically characterised as quasi-brittle with low tensile strength and low strain capacity, which hence affect the long-term durability of the structure. One of the most important issues in designing and maintaining massive concrete structures like offshore and nuclear power plants is concrete cracking, which is due to the low tensile strength of concrete. This can destroy the structural aesthetic and lead to deterioration of the structure.The addition of fibers to concrete has been proven to be a good mean to control its crack behaviour and maintain its ductility in tension. Further, since the discovery of carbon nanotubes/fibers (CNT/CNF), they have been also considered as efficient fibers for construction materials such as concrete.This study presents the structural performance of steel-concrete (SC) elements with a fiber reinforced concrete (FRC) core using both single and hybrid fibers (i.e. consisting of two types of fibers). For this study carbon nanofibers, and steel fibers which are conventionally used in practice, are used for the FRC. Static tests were conducted on eight SC beams with different concrete types. The paper reports on the experimental results obtained from four-point flexural loading of the SC beams. The study shows considerable improvement for both the strength and ductility of the tested specimens.The research laid the groundwork for additional in-depth studies on using carbon nanofiber reinforced concrete within structural members.

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“…In the past decade, researchers focused on portland cement based materials (PCBMs) have been attempting to incorporate carbon nanofibers (CNFs) and carbon nanotubes (CNTs) into cement paste, mortar, and concrete to create a composite with enhanced mechanical, electrical, and thermal properties [1][2][3][4][5][6][7][8][9][10]. The susceptibility of nanoparticles and nanofibers to thermal effects and van der Waals' forces, especially in water where CNFs and CNTs display hydrophobic tendencies, creates a ubiquitous hindrance to successfully incorporating CNFs and CNTs into PCBMs.…”

Section: Introductionmentioning

confidence: 99%

Dispersion of High Concentrations of Carbon Nanofibers in Portland Cement Mortars

Hogancamp

Grasley

2017

Journal of Nanomaterials

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This research focuses on creating and maintaining a stable dispersion of carbon nanofibers (CNFs) in portland cement based materials. A microfine cement is used in conjunction with an untraditional dispersion method to encourage and stabilize the dispersion of CNFs in concentrations up to 5% by mass of cement. A computational simulation was utilized to examine an effect called geometric clustering on the dispersion of CNFs among Type I/II and microfine cement grains. The geometric clustering simulation revealed a higher achievable dispersion for microfine cement than for Type I/II cement. Scanning electron microscopy (SEM) was used to quantify the dispersion of CNFs among Type I/II and microfine cement grains. SEM image analysis indicated excessive CNF clumping among Type I/II cement grains, while the dispersion of hybrid microfine cement mortar continued to improve as the concentration of CNFs increased up to 5% by mass of cement. Mortar cube elastic stiffness and mortar prism flexure tests revealed that high concentrations of CNFs had detrimental effects in hybrid Type I/II cement mortar, whereas similar concentrations of CNFs had negligible or beneficial effects in hybrid microfine cement mortar.

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Electrical resistance of carbon-nanofiber concrete

Cited by 32 publications

References 10 publications

Mechanical and self-sensing properties of concrete reinforced with carbon nanofibres

Mechanical and self-sensing properties of concrete reinforced with carbon nanofibres

Structural performance of steel-concrete sandwich beams with carbon nanofiber reinforcement

Dispersion of High Concentrations of Carbon Nanofibers in Portland Cement Mortars

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