Partial replacement of carbon fiber by carbon black in multifunctional cement–matrix composites

Wen, Sihai; Chung, D.D.L.

doi:10.1016/j.carbon.2006.10.024

Cited by 172 publications

(99 citation statements)

References 35 publications

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“…Several studies have analysed smart sensors consisting of cement-based materials doped with carbon nanoinclusions [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. A particularly promising strain sensor based on a multifunctional cement-based composite material, termed Carbon NanoTube Cement-based Sensor (CNTCS), has been recently developed by some of the authors [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Electromechanical modelling of a new class of nanocomposite cement-based sensors for structural health monitoring

D’Alessandro

Ubertini

Materazzi

et al. 2014

Structural Health Monitoring

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This work focuses on the analysis of a new nanocomposite cement-based sensor (carbon nanotube cementbased sensor), for applications in vibration-based structural health monitoring of civil engineering structures. The sensor is constituted of a cement paste doped with multi-walled carbon nanotubes, so that mechanical deformations produce a measurable change of the electrical resistance. Prior work of some of the authors has addressed the fabrication process, dynamic behaviour and implementation to full-scale structural components. Here, we investigate the effectiveness of a linear lumped-circuit electromechanical model, in which dynamic sensing is associated with a strain-dependent modulation of the internal resistance. Salient circuit parameters are identified from a series of experiments where the distance between the electrodes is parametrically varied. Experimental results indicate that the lumped-circuit model is capable of accurately predicting the step response to a voltage input and its steady-state response to a harmonic uniaxial deformation. Importantly, the model is successful in anticipating the presence of a superharmonic component in sensor's output. KeywordsCarbon nanotubes, electromechanical model, nanotechnology, smart materials, smart sensors, structural health monitoring nanotubes, so that mechanical deformations produce a measurable change of the electrical resistance.Prior work of some of the authors has addressed the fabrication process, dynamic behaviour, and implementation to full-scale structural components. Here, we investigate the effectiveness of a linear lumped-circuit electromechanical model, in which dynamic sensing is associated with a straindependent modulation of the internal resistance. Salient circuit parameters are identified from a series of experiments where the distance between the electrodes is parametrically varied. Experimental results indicate that the lumped-circuit model is capable of accurately predicting the step response to a voltage input and its steady-state response to a harmonic uniaxial deformation. Importantly, the model is successful in anticipating the presence of a superharmonic component in sensor's output.

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Section: Introductionmentioning

confidence: 99%

Electromechanical modelling of a new class of nanocomposite cement-based sensors for structural health monitoring

D’Alessandro

Ubertini

Materazzi

et al. 2014

Structural Health Monitoring

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“…EMI shielding (S) was calculated from Equation 1 (20), where I e is the intensity of the radiation emitted and I r is the intensity of the radiation received by the network analyzer. Further to the set-up diagram in Figure 2, which had been used in prior studies (17,23), radiation was emitted by one of the network analyzer ports onto the specimen surface (where a certain portion Tabla 3 / Table 3 Dosificaciones de las probetas ensayadas. Porcentaje de adición de los materiales carbonosos y porcentaje de sustitución de la ceniza volante, respecto masa de cemento.…”

Section: Methodsmentioning

confidence: 99%

“…Sketch of EMI measurement cell. (17,23), la radiación se emite por uno de los puertos del analizador de redes, alcanza la superficie de la probeta (donde cierta cantidad de intensidad se pierde por reflexión), atraviesa la probeta (donde otra fracción de intensidad se pierde por absorción) y finalmente, la radiación se recibe en el otro puerto del analizador de redes.…”

Section: Methodsunclassified

Función de apantallamiento de interferencia electromagnética de pastas de cemento con materiales carbonosos y cenizas volantes procesadas

et al. 2010

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RESUMENEn el presente trabajo se investiga la influencia de la adición de diferentes tipos de materiales carbonosos (polvo de grafito y 3 tipos de fibra de carbono), de una ceniza volante con diferentes contenidos de fase magnética (5,6%, 15,9% y 24,3% de Fe 2 O 3 ) y de una mezcla de ambos, sobre la capacidad de apantallar interferencias electromagnéticas de pastas de cemento Pórtland. Entre los parámetros estudiados se encuentra: el tipo de material carbonoso, la relación de aspecto del material carbonoso, el espesor del material compuesto, la frecuencia de la radiación electromagnética incidente y el porcentaje de fracción magnética en la ceniza volante. Los resultados obtenidos indican que entre los materiales carbonosos estudiados son las fibras de carbono basadas en poliacrilonitrilo con una mayor relación de aspecto las que dan mejores resultados de apantallamiento. Al aumentar el espesor del material compuesto o la frecuencia de radiación también aumenta la eficacia del apantallamiento. En lo que respecta a la ceniza volante, el incremento de la fracción magnética de la ceniza incrementa el nivel de apantallamiento. No obstante, los resultados más eficaces se obtienen por la adición conjunta de fibras de carbono y ceniza volante debido a un efecto sinérgico.Palabras clave: Apantallamiento EMI, pasta de cemento, ceniza volante procesada, fibra de carbono, polvo de grafito. ABSTRACTThe study described in this article explored the effect of adding different types of carbon materials (graphite powder and three types of carbon fibre), fly ash (with 5.6%, 15.9% and 24.3% Fe 2 O 3 ), and a mix of both on electromagnetic interference (EMI) shielding in Portland cement pastes. The parameters studied included the type and aspect ratio of the carbonic material, composite material thickness, the frequency of the incident electromagnetic radiation and the percentage of the magnetic fraction in the fly ash. The findings showed that the polyacrylonitrile-based carbon fibres, which had the highest aspect ratio, provided more effective shielding than any of the other carbon materials studied. Shielding was more effective in thicker specimens and at higher radiation frequencies. Raising the magnetic fraction of the fly ash, in turn, also enhanced paste shielding performance. Finally, adding both carbon fibre and fly ash to the paste resulted in the most effective EMI shielding as a result of the synergies generated.Keywords: EMI shielding, cement paste, processed fly ash, carbon fibre, graphite powder. Persona de contacto/Corresponding author: pedro.garces@ua.es INTRODUCCIÓNLos materiales cementantes tienen una gran importancia en el campo de la ingeniería estructural debido a sus propiedades mecánicas, buena durabilidad y bajo coste. Sin embargo, durante los últimos años, se está haciendo un esfuerzo para aumentar la funcionalidad de este material estructural y obtener un mayor rendimiento del mismo (1). Esta investigación se ha enfocado en la mejora del apantallamiento de interferencia electromagnética (EMI) ofrecida po...

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“…However, the CCP-9 sample with higher carbon fiber content (80 wt%) had lower electrical conductivity than the CCP-8 sample because the carbon powder (10 wt%) filled the gap between adjacent carbon fibers and formed a more electrically conductive path. Powders and fibers used in combination have greater influence on the electrical conductivity of composites compared to fibers alone (Wen & Chung, 2007). for Gas Diffusion Layer Figure 1 Electrical conductivity of CCP with various carbon fiber contents…”

Section: Characterization Of Carbon Papermentioning

confidence: 99%

Preparation and Characterization of Carbon Composite Paper from Coconut Coir for Gas Diffusion Layer

Destyorini

Subhan

Indayaningsih

et al. 2016

IJTech

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The gas diffusion layer (GDL) is one of the critical components of a proton exchange membrane fuel cell (PEMFC). It is generally made of a fossil-fuel-based carbon material. In this study, carbon composite paper (CCP) for GDL was prepared by using carbon material obtained from coconut coir. To obtain the CCP, 80 wt% carbon material from the coconut coir and 20 wt% polymer binder (ethylene vinyl acetate and polyethylene glycol) were mixed in xylene solvent at 100°C, cast on molded glass, and then rolled. The carbon material consists of a mixture of carbon fibers (length: 2 mm) and powders (size: 74 µm). Subsequently, the CCP was treated with polytetrafluoroethylene solution (10 wt%). The physical properties of the CCPs, such as through-plane electrical conductivity, porosity, density, and hydrophobic properties, were investigated. Scanning electron microscopy and energy-dispersive spectroscopy mapping were used to analyze the morphology and polytetrafluoroethylene (PTFE) distribution in the CCP. The through-plane conductivity test showed that CCP with 70 wt% carbon fiber, 10 wt% carbon powder, and 20 wt% polymer was the optimum sample, and it showed the highest electrical conductivity of 2.22 S cm -1 . The physical properties of PTFEtreated CCP, such as porosity, density, and contact angle, were almost similar to that of commercial carbon paper used as a GDL. Therefore, the CCP prepared from coconut coir can be applied as a GDL in a PEMFC.

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Partial replacement of carbon fiber by carbon black in multifunctional cement–matrix composites

Cited by 172 publications

References 35 publications

Electromechanical modelling of a new class of nanocomposite cement-based sensors for structural health monitoring

Electromechanical modelling of a new class of nanocomposite cement-based sensors for structural health monitoring

Función de apantallamiento de interferencia electromagnética de pastas de cemento con materiales carbonosos y cenizas volantes procesadas

Preparation and Characterization of Carbon Composite Paper from Coconut Coir for Gas Diffusion Layer

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