Electrical percolation phenomena in cement composites containing conductive fibres

Xie, Ping; Gu, Ping; Beaudoin, J.J.

doi:10.1007/bf00352673

Cited by 228 publications

(81 citation statements)

References 5 publications

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“…For the determination of DC conductivity, the calculated resistance value (R), cross sectional area of the electrode in contact with the composites (A), and the interval of the electrodes (L) were plugged into a following equation (Xie et al 1996;Vance et al 2014…”

Section: Measurement Methodsmentioning

confidence: 99%

“…In an effort to gain mechanical strength to prevent unexpected damages in the samples, they were submerged in water during 7 days. Li et al (2007) and Xie et al (1996) revealed that the CNT distribution in CNT-added composite materials can be assessed by examining the DC conductivity of the materials (Li et al 2007;Xie et al 1996). Once SEM or transmission electron microscopy (TEM) reveal that CNTs are homogeneously dispersed in the composite materials, DC conductivity evaluation can be used in an effort to identify the percolation network, which is a large cluster network spanning from one side to the opposite side without disconnection in the composite materials (Stauffer and Aharony 1994).…”

Section: Conductivity Of the Mwnt-embedded Cement Composites 321mentioning

confidence: 99%

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Image Analysis and DC Conductivity Measurement for the Evaluation of Carbon Nanotube Distribution in Cement Matrix

Nam

Lee

2015

International Journal of Concrete Structures and Materials

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The present work proposes a new image analysis method for the evaluation of the multi-walled carbon nanotube (MWNT) distribution in a cement matrix. In this method, white cement was used instead of ordinary Portland cement with MWNT in an effort to differentiate MWNT from the cement matrix. In addition, MWNT-embedded cement composites were fabricated under different flows of fresh composite mixtures, incorporating a constant MWNT content (0.6 wt%) to verify correlation between the MWNT distribution and flow. The image analysis demonstrated that the MWNT distribution was significantly enhanced in the composites fabricated under a low flow condition, and DC conductivity results revealed the dramatic increase in the conductivity of the composites fabricated under the same condition, which supported the image analysis results. The composites were also prepared under the low flow condition (114 mm \ flow \ 126 mm), incorporating various MWNT contents. The image analysis of the composites revealed an increase in the planar occupation ratio of MWNT, and DC conductivity results exhibited dramatic increase in the conductivity (percolation phenomena) as the MWNT content increased. The image analysis and DC conductivity results indicated that fabrication of the composites under the low flow condition was an effective way to enhance the MWNT distribution.

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Section: Measurement Methodsmentioning

confidence: 99%

Section: Conductivity Of the Mwnt-embedded Cement Composites 321mentioning

confidence: 99%

Image Analysis and DC Conductivity Measurement for the Evaluation of Carbon Nanotube Distribution in Cement Matrix

Nam

Lee

2015

International Journal of Concrete Structures and Materials

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“…In [30] it is shown that the percolation concentration depends on conductive fibre geometry instead of system composition: the longer the conductive elements, the lower the threshold. Thus, long CNTs are more prone to create a continuous conductive path and this affects also the piezoresistive response of the composite.…”

Section: Recommended Cnt Concentration and Dispersion In Cement Pastementioning

confidence: 99%

Towards the Standardized Fabrication of CNT-Cement Based Composites for Structural Health Monitoring: An Application-Oriented Literature Survey

RAINIERI¹,

GARGARO²,

SONG³

et al. 2013

JMC

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“…Literature shows a growing interest in such nanofillers [48][49][50][51][52]. Research has studied dispersion strategies in different types of matrices [53,5454] and fabrication processes [54][55][56], and conducted experimental investigations mainly focused on quasi-static loads [57][58][59][60][61][62]. The dispersion of CNTs is an intricate task due to the presence of Van der Waals forces among the single tubes which lead to the formation of bundles [63,64].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Static and Dynamic Strain Sensitivity of Smart Concrete Sensors Doped with Carbon Nanotubes for SHM of Large Structures

Meoni¹,

D’Alessandro²,

Downey³

et al. 2018

Preprint

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Abstract:The availability of new self-sensing cement-based strain sensors allows the development of dense sensor networks for Structural Health Monitoring (SHM) of reinforced concrete structures. These sensors are fabricated by doping cement-matrix materials with conductive fillers, such as Multi Walled Carbon Nanotubes (MWCNTs), and can be embedded into structural elements made of reinforced concrete prior to casting. The strain sensing principle is based on the multifunctional composites outputting a measurable change in their electrical properties when subjected to a deformation. Previous work by the authors was devoted to material fabrication, modeling and applications in SHM. In this paper, we investigate the behavior of several sensors fabricated with and without aggregates and with different MWCNTs content. The strain sensitivity of the sensors, in terms of fractional change in electrical resistivity for unit strain, as well as their linearity are investigated through experimental testing under both static and dynamically varying compressive loadings. Moreover, the responses of the sensors when subjected to destructive compressive tests are evaluated. Overall, the presented results contribute to improving the scientific knowledge on the behavior of smart concrete sensors and to furthering their understanding for SHM applications.

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Electrical percolation phenomena in cement composites containing conductive fibres

Cited by 228 publications

References 5 publications

Image Analysis and DC Conductivity Measurement for the Evaluation of Carbon Nanotube Distribution in Cement Matrix

Image Analysis and DC Conductivity Measurement for the Evaluation of Carbon Nanotube Distribution in Cement Matrix

Towards the Standardized Fabrication of CNT-Cement Based Composites for Structural Health Monitoring: An Application-Oriented Literature Survey

An Experimental Study on Static and Dynamic Strain Sensitivity of Smart Concrete Sensors Doped with Carbon Nanotubes for SHM of Large Structures

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