In situ-grown carbon nanotubes enhanced cement-based materials with multifunctionality

Zhan, Mimi; Pan, Ganghua; Zhou, Feifei; Mi, Renjie; Shah, Surendra P.

doi:10.1016/j.cemconcomp.2020.103518

Cited by 87 publications

(34 citation statements)

References 75 publications

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“…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%

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%

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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“…Guan et al [29] reported that the maximum improvement in the compressive strength of CNTs incorporated in cement paste was identified at 0.1 wt% of CNTs by weight of cement, while at 0.5 wt% CNTs loading the maximum improvement were noticed for the flexural strength of cement paste. Zhan et al [52] evaluated the performance of cementitious mortar under different loadings of CNTs and reported that the maximum flexural strength and compressive strength were achieved at 0.8 wt% and 1.2 wt% CNT loadings (Figure 12). Similarly, Vesmawala et al [37] investigated the influences of the concentration of CNTs on the mechanical properties of concrete.…”

Section: Mechanical Properties Of Cementitious Composites Incorporatimentioning

confidence: 99%

“…Relation between compressive and flexural strength of cement mortar with different concentrations of CNTs[52].…”

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confidence: 99%

The Effect of Carbon Nanotubes on the Flowability, Mechanical, Microstructural and Durability Properties of Cementitious Composite: An Overview

2020

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Excellent mechanical properties and chemical stability make carbon nanotubes (CNTs) some of the most promising nanomaterials that can be used in cementitious composites to improve their performance. However, the difficulty of CNTs’ dispersion within the cementitious structure still exists and thus prevents the homogeneous distribution of CNTs. The homogeneous distribution of CNTs within a composite structure plays an essential role that can have a positive effect on the mechanical performance of CNT-cement composites. This paper introduces the methods for the production of CNTs and provides useful information about the influence of CNTs on the flowability, mechanical performance, microstructural changes and hydration of cement composites. The influences of water-cement ratio, used surfactants and various doses of CNTs on the properties of cementitious composites were also studied.

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“…However, their studies reported that an improved dispersion mechanism for CNT particles in cementitious matrix would demonstrate superior sensing capabilities in smart concrete material. It has also been reported that adding CNTs to cementitious mixture not only improves mechanical performance but also enables the sensing capabilities [57][58][59] Based on related recent studies, the authors identified a gap within the research scope of cement based sensors, i.e. how different fiber types would interact with f-CNTs, which consist of different aspect ratios and properties, at lower volume fraction, when used with suitable admixtures.…”

Section: Introductionmentioning

confidence: 99%

Use of silica particles to improve dispersion of -COOH CNTs/carbon fibers to produce HyFRCC

Garg

Das

Gupta

2020

Construction and Building Materials

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The development of hybrid fiber reinforced cement composite that has high strength, scope to be used as cement-based sensors has been investigated in this study by using a combination of carbon fibers and carbon nanotubes (CNT) at low volume fraction. The dispersion of CNTs was enhanced by using polycarboxylate based superplasticizer that resulted in a homogeneous aqueous stable solution, and profoundly improved dispersion when integrated with the cementitious matrix. Different siliceous additives were also incorporated into the mixes to improve the dispersion of CNTs in the matrix, where micro-silica outperformed as compared to nano-silica, confirmed morphologically. On the other hand, nano-silica enhanced dispersion of milled carbon fibers in the aqueous state. The sensing behavior was determined by the measurement of bulk resistance of mixes and the samples were subjected to compressive loading to study the strength improvement with the incorporation of fibers. The experimental results reveal that hybrid combination of chopped carbon fibers, micro silica, and low volume fraction of CNTs in a cementitious matrix results in a stronger and durable concrete that holds the potential for sensing applications. Thus, laying a strong foundation for the future of low cost smart cement based materials.

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In situ-grown carbon nanotubes enhanced cement-based materials with multifunctionality

Cited by 87 publications

References 75 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

The Effect of Carbon Nanotubes on the Flowability, Mechanical, Microstructural and Durability Properties of Cementitious Composite: An Overview

Use of silica particles to improve dispersion of -COOH CNTs/carbon fibers to produce HyFRCC

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