Electrical conductivity and piezo-resistive characteristics of CNT and CNF incorporated cementitious nanocomposites under static and dynamic loading

Sasmal, Saptarshi; Ravivarman, N.; Sindu, B.S.; Vignesh, K.

doi:10.1016/j.compositesa.2017.05.018

Cited by 120 publications

(35 citation statements)

References 60 publications

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“…A comparison of the results, in terms of GF, obtained in this work with some papers dealing with strain-sensing cementitious materials are reported in Figure 14. However, a direct comparison is difficult because the strain sensing ability is affected by several parameters: testing mode (compression and tension) [80], load rate [81], conductive filler (CNF, CNT etc) [82], cementitious material (paste, mortar or concrete) [25], etc. Nevertheless, it is evident that the GF for PP/CNT-5 and PP/CNT-7 at 0.20% of strain is higher than the GF of most of the previous published works here used as comparison ( Figure 14) [19,25,80,[82][83][84][85][86][87][88][89][90][91].…”

Section: Strain-sensing Testsmentioning

confidence: 99%

“…However, a direct comparison is difficult because the strain sensing ability is affected by several parameters: testing mode (compression and tension) [80], load rate [81], conductive filler (CNF, CNT etc) [82], cementitious material (paste, mortar or concrete) [25], etc. Nevertheless, it is evident that the GF for PP/CNT-5 and PP/CNT-7 at 0.20% of strain is higher than the GF of most of the previous published works here used as comparison ( Figure 14) [19,25,80,[82][83][84][85][86][87][88][89][90][91]. Moreover, PP/CNT-5 nanocomposites at 0.40% of strain have the highest GF among the compared works ( Figure 14) [19,25,80,[82][83][84][85][86][87][88][89][90][91][92][93][94].…”

Section: Strain-sensing Testsmentioning

confidence: 99%

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Preparation and Characterization of Polypropylene/Carbon Nanotubes (PP/CNTs) Nanocomposites as Potential Strain Gauges for Structural Health Monitoring

et al. 2020

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Polypropylene/carbon nanotubes (PP/CNTs) nanocomposites with different CNTs concentrations (i.e., 1, 2, 3, 5 and 7 wt%) were prepared and tested as strain gauges for structures monitoring. Such sensors were embedded in cementitious mortar prisms and tested in 3-point bending mode recording impedance variation at increasing load. First, thermal (differential scanning calorimetry (DSC), thermo-gravimetric analysis (TGA)), mechanical (tensile tests) and morphological (FE-SEM) properties of nanocomposites blends were assessed. Then, strain-sensing tests were carried out on PP/CNTs strips embedded in cementitious mortars. PP/CNTs nanocomposites blends with CNTs content of 1, 2 and 3 wt% did not show significant results because these concentrations are below the electrical percolation threshold (EPT). On the contrary, PP/CNTs nanocomposites with 5 and 7 wt% of CNTs showed interesting sensing properties. In particular, the best result was highlighted for the PP/CNT nanocomposite with 5 wt% CNTs for which an average gauge factor (GF) of approx. 1400 was measured. Moreover, load-unload cycles reported a good recovery of the initial impedance. Finally, a comparison with some literature results, in terms of GF, was done demonstrating the benefits deriving from the use of PP/CNTs strips as strain-gauges instead of using conductive fillers in the bulk matrix.

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Section: Strain-sensing Testsmentioning

confidence: 99%

Section: Strain-sensing Testsmentioning

confidence: 99%

Preparation and Characterization of Polypropylene/Carbon Nanotubes (PP/CNTs) Nanocomposites as Potential Strain Gauges for Structural Health Monitoring

et al. 2020

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“…On the other hand, progress in the field of nanomaterials is an inestimable opportunity to develop new materials, existing among others, nanofibers (CNFs), carbon nanotubes (CNTs) and graphene oxide (GO), which offer a further dimension for interacting with cement and with concrete. The effect of incorporating low dosages of nanomaterials delivers improvements in the hydration, microstructure and mechanical properties of cement-based materials, due to their electrical and chemical properties [18,19]. The main disadvantages of the nanoscale use of these new materials are the lack of binding between the nanoparticles and the cement mixture and the high cost of producing them, although there are more economical options, such as carbon nanoplatelets, which improve watertightness and prevent chloride intrusion [20].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Behavior of Mass Concrete with the Addition of Carbon Nanofibers (CNFs) When Exposed to Fire

Somolinos¹,

Barrio²,

González³

et al. 2019

Applied Sciences

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Due to the importance of concrete as a structural material and the pathologies that can be achieved by reinforced concrete structures when they are subjected to the action of fire both at the level of resistance and deformation, in this research we study the mechanical behavior of mass concrete with the addition of carbon nanofibers (CNFs) when exposed to the action of fire, in order to determine the improvements that this type of addition produces in concrete. To achieve this objective, compression break tests have been carried out on cylindrical concrete specimens incorporating CNFs. From the analysis of results, it can be concluded that the residual resistant capacity of concrete with the addition of 1% of CNFs by weight of cement subjected to the direct action of fire, is greater than that of concrete without additions, not obtaining better results, if the addition of CNFs increases to 2%. The addition of 1% of CNFs has not influenced the temperatures reached in the concrete, but produces a more homogeneous cooling and that the paste-aggregate bond is maintained despite thermal aggression, which decreases the spalling effect.

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“…In general, the piezoresistive response of polymer/CNT composites was investigated under different cyclic loading [23][24][25][26]. However, the time-dependent electrical behavior of polymer/CNT composites was barely investigated.…”

mentioning

confidence: 99%

On The Strain Sensing of EVA/MWCNT Composite

Rosculet¹,

Stan²,

Fetecău³

2018

Mat.Plast.

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In this paper, the potential of using ethylene-vinyl acetate (EVA) filled with multi-wall carbon nanotubes (MWCNT) composites for strain sensing was investigated. Stress relaxation experiments were conducted on injection-molded samples, and the stress and electrical resistance were measured in situ during the relaxation process. Based on the experimental results, it was found that the electrical resistance of the EVA/MWCNT composite increases with increasing strain, and exponentially decreases with relaxation time, indicating the capacitive behavior of MWCNTs. The maximum electrical conductivity of 7.35�10-4 S/cm was obtained for the EVA/MWCNT composite with 5 wt.% at 180�C, whereas higher piezo-resistive sensitivity was obtained for the composite with 3 wt.%. The electrical percolation threshold was found to increase from 0.223 wt.% at 140�C to 0.994 wt.% at 180�C.

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Electrical conductivity and piezo-resistive characteristics of CNT and CNF incorporated cementitious nanocomposites under static and dynamic loading

Cited by 120 publications

References 60 publications

Preparation and Characterization of Polypropylene/Carbon Nanotubes (PP/CNTs) Nanocomposites as Potential Strain Gauges for Structural Health Monitoring

Preparation and Characterization of Polypropylene/Carbon Nanotubes (PP/CNTs) Nanocomposites as Potential Strain Gauges for Structural Health Monitoring

Analysis of the Behavior of Mass Concrete with the Addition of Carbon Nanofibers (CNFs) When Exposed to Fire

On The Strain Sensing of EVA/MWCNT Composite

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