Residual piezoresistive properties of mortars containing carbon nanomaterials exposed to high temperatures

Nalon, Gustavo Henrique; Ribeiro, José Carlos Lopes; Pedroti, Leonardo Gonçalves; Araújo, Eduardo Nery Duarte de; Carvalho, José Maria Franco de; Lima, Gustavo Emílio Soares de; Guimarães, Luciano de Moura

doi:10.1016/j.cemconcomp.2021.104104

Cited by 24 publications

(12 citation statements)

References 35 publications

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“…83 Relatively, NCB dosage of 3% in SSCM does not perform piezoresistivity behavior due to reduction in percolation threshold. 103 Whereas, MLG in cement composites with 2% of filler dosage possess percolation threshold 82 which is lower than the inclusion of nickel particle. 161 However, when MLG content is lower than 2%, separation between fillers is notified 82 and the role of the filler is diminished.…”

Section: Filler Concentrationmentioning

confidence: 98%

“…At the same time, NCB dosage beyond 7.5% governs the electrical conductivity by reducing the electrical resistivity 83 . Relatively, NCB dosage of 3% in SSCM does not perform piezoresistivity behavior due to reduction in percolation threshold 103 . Whereas, MLG in cement composites with 2% of filler dosage possess percolation threshold 82 which is lower than the inclusion of nickel particle 161 .…”

Section: Filler Concentrationmentioning

confidence: 99%

“…109 On the one hand, cement composites containing 0.8% and 1.2% of MWCNT exposed to a temperature of 400 C demonstrated adequate sensing ability for monitoring fire damages in concrete structures. 103 On the other hand, temperature affects the sensing ability and electrical behavior of the cement composite containing lower MWCNT content (≤0.4%). 132 Geopolymer concrete incorporated with CNT exhibited better response in terms of electrical resistivity at different loading levels.…”

Section: Sequel Of Cntmentioning

confidence: 99%

“…So, incorporation of small amount of CNT in liquid form helps to alleviate the dispersing issue and revamps the self‐sensing capabilities in cement composites used to detect stress and monitor micro cracks in concrete structures 109 . On the one hand, cement composites containing 0.8% and 1.2% of MWCNT exposed to a temperature of 400°C demonstrated adequate sensing ability for monitoring fire damages in concrete structures 103 . On the other hand, temperature affects the sensing ability and electrical behavior of the cement composite containing lower MWCNT content (≤0.4%) 132 .…”

Section: Typical Functional Fillers For Sscmmentioning

confidence: 99%

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Smart cement‐sensor composite: The evolution of nanomaterial in developing sensor for structural integrity

Kanagasundaram

Elavenil

2023

Structural Concrete

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The integration of self‐sensing ability and different functional properties of nanomaterials into construction materials leads to smart and multifunctional cementitious sensor composites. Significant evolution of the Structural Health Monitoring (SHM) has helped to elevate the life span and mitigate damages of the structure. Developing smart cementitious sensor composite with electrical properties as a parent element and embedding it in the structural components have proved to be advantageous in terms of evaluating the damages, monitoring the periodic health and life assessment of the structures. In this review, the copious development processes and various methods of designing smart‐sensing cementitious composites have been scrutinized. This work recapitulates the principle of self‐sensing technique, typical functional fillers, trends of percolation threshold, dispersing material, dispersion technology, and also describes the required sensing ability of the sensors using the conduction theory. Subsequently application of smart cement‐sensors in structural components for SHM is discussed. In addition, this review article provides comprehensive information on the effects of nano materials and their dispersion in the development for smart and multifaceted cementitious sensor composites with enhanced sensitivity parameters and economic benefits that are suitable for future prospects.

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Section: Filler Concentrationmentioning

confidence: 98%

Section: Filler Concentrationmentioning

confidence: 99%

Section: Sequel Of Cntmentioning

confidence: 99%

Section: Typical Functional Fillers For Sscmmentioning

confidence: 99%

See 2 more Smart Citations

Smart cement‐sensor composite: The evolution of nanomaterial in developing sensor for structural integrity

Kanagasundaram

Elavenil

2023

Structural Concrete

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“…Extreme climate conditions such as freeze and thaw cycles might cause phase transformation of water, between solid and liquid state, causing micro-cracks into the matrix and irreversible increase of resistivity combined with low repeatability [66]. Nevertheless, investigations about the sensing ability of CSCs at very high temperature (larger than 200 • C, representative of the temperatures in fire-damaged structures) are in progress and the first results have been recently published in the literature [67]. These studies might have significant impact on the applications of CSCs to civil SHM but further studies are needed to reach well-established results and firm conclusions.…”

Section: Environmental Effects and Durabilitymentioning

confidence: 99%

Applications of Cement-Based Smart Composites to Civil Structural Health Monitoring: A Review

2021

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In recent years, cement-based smart composites (CSCs) doped with conductive filler have attracted increasing research interest because of their high potentiality as self-sensing materials for civil Structural Health Monitoring (SHM) applications. Nevertheless, several issues are still open and need further studies. This paper presents an extensive state-of-the-art in which investigations on CSCs are summarized and critically revised, with the primary aim of outlining the main limits and development points. The literature review first addresses in detail several specific issues related to fabrication and operation as sensing elements of CSC samples. State-of-the-art applications of CSCs to SHM of reduced-, medium- and full-scale structural prototypes are extensively reviewed afterwards, resulting in a database useful to critically revise the main trends and open issues of the research in this field.

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Effect of Fine Aggregates and Test Settings on the Self-sensing Response of Cement-Based Composites with Carbon Nanotubes as Conductive Filler

Santos¹,

Carisio²,

Martins³

et al. 2023

Lecture Notes in Civil Engineering

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Cement-based self-sensing composites with carbon nanotubes (CNT) have attracted attention due to their multifunctional properties and great potential for their application in the smart monitoring of concrete structures. In this study, the self-sensing properties of one paste and three mortars containing 0.50 and 0.75 wt% of CNT, and 1.5 and 1.0 sand/cement ratio were investigated, aiming to evaluate their impact on the piezoresistive response of the composites. The inclusion of sand in the cement paste with CNT led to a reduced gauge factor and a higher electrical noise response. The inert aggregates modified the compressive loading mechanical response of the composites and possibly acted as barriers to electronic mobility, by increasing the CNT conductive paths’ tortuosity or even interrupting them. The mortar containing 0.50% of CNT showed a higher electrical resistivity and, at the same time, greater sensitivity and a more linear self-sensing response than the one with 0.75% CNT, which can be explained by the CNT content being closer to its percolation threshold in the first. In this way, a lower CNT concentration generated a conductive network with a higher capacity to be rearranged under loading, generating significant changes in resistivity, but a higher CNT concentration presented a more stable and conductive network. The results suggested that both the conductive and non-conductive phases affect the detection performance of the composites and, therefore, must be dosed appropriately. Additionally, the test setup modifications positively affected the self-sensing response signal, which is particularly useful to reduce the deleterious effects of the sand additions in the matrix. This overall approach can make the use of self-sensing mortars in structural monitoring a viable option.

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Residual piezoresistive properties of mortars containing carbon nanomaterials exposed to high temperatures

Cited by 24 publications

References 35 publications

Smart cement‐sensor composite: The evolution of nanomaterial in developing sensor for structural integrity

Smart cement‐sensor composite: The evolution of nanomaterial in developing sensor for structural integrity

Applications of Cement-Based Smart Composites to Civil Structural Health Monitoring: A Review

Effect of Fine Aggregates and Test Settings on the Self-sensing Response of Cement-Based Composites with Carbon Nanotubes as Conductive Filler

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