Electrical characteristics and pressure-sensitive response measurements of carboxyl MWNT/cement composites

Han, Baoguo; Zhang, Kun; Yu, Xun; Kwon, Eil; Ou, Jinping

doi:10.1016/j.cemconcomp.2012.02.012

Cited by 155 publications

(81 citation statements)

References 9 publications

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“…As reported in [31], the percolation threshold of CNT/cement composites is likely lower than 1% of cement content, when the matrix is made by cement paste and MWCNTs are adopted. This is in agreement with the typical concentration of CNTs (in the range 0.1-0.5% weight of cement) adopted in the fabrication of cement based sensors [5,7,9,31,32,33]. It is worth noting that the percolation threshold is higher when the matrix is made by mortar instead of cement paste [31].…”

Section: Recommended Cnt Concentration and Dispersion In Cement Pastesupporting

confidence: 73%

“…However, these composites have both resistance and capacitance characteristics, and the capacitance is insensitive to compressive loading. The charging of the capacitor just causes a linear increase in the measured resistance during DC measurement [33]. This is an effect of electric polarization.…”

Section: Additional Remarks On the Prepara-tion Of Samplesmentioning

confidence: 99%

“…This effect is small at low frequencies, but it has to be taken into account at high frequencies, where the difference becomes more pronounced [34]. The piezoresistive sensitivity of carboxyl MWCNT/cement composites also increases with the decrease of AC voltage amplitude [33]. In fact, high voltage amplitude at both ends of the composite can more easily induce capacitor charging and discharging during the test.…”

Section: Additional Remarks On the Prepara-tion Of Samplesmentioning

confidence: 99%

See 2 more Smart Citations

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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Section: Recommended Cnt Concentration and Dispersion In Cement Pastesupporting

confidence: 73%

Section: Additional Remarks On the Prepara-tion Of Samplesmentioning

confidence: 99%

Section: Additional Remarks On the Prepara-tion Of Samplesmentioning

confidence: 99%

See 1 more Smart Citation

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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“…The use of any strain-sensing material requires the assumption of an electromechanical model to relate strain to a measurable electrical parameter. While various equivalent electromechanical models for cement-based materials doped with MWCNT have been introduced [27,28], these models typically conclude that only resistance is influenced by the mechanical deformation [28]. Under this assumption, the resistance-strain relationship can be presented as:…”

Section: Self-sensing Cementitious Materialsmentioning

confidence: 99%

Damage detection, localization and quantification in conductive smart concrete structures using a resistor mesh model

Downey

D’Alessandro

Baquera

et al. 2017

Engineering Structures

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Interest in self-sensing structural materials has grown in recent years due to their potential to enable continuous low-cost monitoring of next-generation smart-structures. The development of cement-based smart sensors appears particularly well suited for structural health monitoring due to their numerous possible field applications, ease of use, and long-term stability. Additionally, cement-based sensors offer a unique opportunity for monitoring of civil concrete structures because of their compatibility with new and existing infrastructure. In this paper, we propose the use of a computationally efficient resistor mesh model to detect, localize and quantify damage in structures constructed from conductive cement composites. The proposed approach is experimentally validated on non-reinforced and reinforced specimens made of nanocomposite cement paste doped with multi-walled carbon nanotubes under a variety of static loads and damage conditions. Results show that the proposed approach is capable of leveraging the strain-sensing and damagesensitive properties of conductive cement composites for real-time distributed structural health monitoring of smart concrete structures, using simple and inexpensive electrical hardware and with very limited computational effort. AbstractInterest in self-sensing structural materials has grown in recent years due to their potential to enable continuous low-cost monitoring of next-generation smart-structures. The development of cement-based smart sensors appears particularly well suited for structural health monitoring due to their numerous possible field applications, ease of use, and long-term stability. Additionally, cement-based sensors offer a unique opportunity for monitoring of civil concrete structures because of their compatibility with new and existing infrastructure. In this paper, we propose the use of a computationally efficient resistor mesh model to detect, localize and quantify damage in structures constructed from conductive cement composites. The proposed approach is experimentally validated on non-reinforced and reinforced specimens made of nanocomposite cement paste doped with multi-walled carbon nanotubes under a variety of static loads and damage conditions. Results show that the proposed approach is capable of leveraging the strain-sensing and damage-sensitive properties of conductive cement composites for real-time distributed structural health monitoring of smart concrete structures, using simple and inexpensive electrical hardware and with very limited computational effort.

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“…For example, some efforts have shown that carbon fibers and nanotubes could modify the electrical resistivity of cementitious materials due to piezoresistivity associated with the slight pull-out of the fibres passing through microcracks [23,28]. Other studies have proposed models to characterize physical behaviour, which includes lumped-circuit models of carbon fibre cement paste sensors based on series-parallel arrays of electrical resistors [29][30][31] and capacitors [32]. In these models, the resistance of cement paste sensors is associated with the intrinsic resistance of the material, the resistance of the electrodes, and the contact resistance between electrodes and cement paste.…”

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.

show abstract

Electrical characteristics and pressure-sensitive response measurements of carboxyl MWNT/cement composites

Cited by 155 publications

References 9 publications

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

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

Damage detection, localization and quantification in conductive smart concrete structures using a resistor mesh model

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

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