Effect of superplasticizer type and siliceous materials on the dispersion of carbon nanotube in cementitious composites

Kim, G. M.; Nam, I.W.; Yoon, H.N.; Lee, Haeng‐Ki

doi:10.1016/j.compstruct.2017.11.011

Cited by 55 publications

(26 citation statements)

References 38 publications

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“…Similar behavior has also been observed by other researcher [74]. Kim [33] reported that the addition of nano-silica did not contribute to the dispersion of MWCNTs (pristine) in water. The rationale behind that lies in the irregular shape of nano-silica particles, and diameter of each particle, which were insufficient in increasing the distance between CNT particles inside the matrix.…”

Section: Effect Of Silica Particles On Cnt Dispersion and Microstructuresupporting

confidence: 89%

“…Only few spots in the sample illustrated long individual CNTs with NS agglomerated around it. Similar morphology of NS CNT embedded specimens has also been reported [33]. Whereas the liquid dried (powder) sample presented a long individual CNT strand as a bridge between two NS agglomerate particles under the microscope.…”

Section: Figure 6: Suspension Of Nanotubes Using Nano-silicaafter Sonsupporting

confidence: 83%

“…On the other hand, researchers have also explored the effectiveness of using silica-based particles to improve the dispersion and bonding of nanotubes in aqueous solutions. Kim et alet al [23,33] studied the influence of siliceous materials and reported that micro-silica was also effective in dispersion of CNTs as compared to surfactants owing to the ball-bearing effect. Further, micro silica helped in reducing the resistivity of the samples when used at 10% weight of cement.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Effect Of Silica Particles On Cnt Dispersion and Microstructuresupporting

confidence: 89%

Section: Figure 6: Suspension Of Nanotubes Using Nano-silicaafter Sonsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

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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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“…According to the studies [13][14][15][16][17][18], steric hindrance plays a major role in the dispersing mechanism. As these negatively charged cement particles repel each other, the water, which is trapped in the agglomerated cement particles, is released, thus, creating the homogeneous dispersion of all the particles.…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Electrical Conductivity of Superplasticizers on the Fluidity and Early Hydration Parameters of Cement Paste

Leonavičius¹

2019

Ceramics - Silikaty

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It is important to select a certain type and amount of a superplasticizer (SP) for successful cement applications in concrete. The results show that the SPs ((lignosulphonates (LS), polyacrylates (PA) and polycarboxylates (PCE)) especially differ by their electrical conductivity (EC) values (from 2.5 to 4 times) and mostly influence the spreadability, viscosity, temperature and hydration course of the cement paste with an SP. Compared to the pure cement paste's viscosity, all the tested amounts of LS, PA and PCE lower the initial temperature of the cement paste, but only PCE and PA noticeably reduce the viscosity. It can be highlighted that LS, characterised with high EC values causes a rise in the cement paste temperature and a sharp growth in the viscosity. PCE and PA with much lower EC values, reduce the temperature and, correspondingly, the viscosity of the paste. EXO temperature tests revealed that the same amount of SP's (0.2 %) has a different effect on the course of the hydration, the EXO maximum time and the temperatures. Compared to the pure cement paste, LS reduced the EXO maximum time by 17 % and lowered the EXO maximum temperature by 6 °C, whereas PCE and PA extended the EXO maximum time by 11.3 % and 12.2 %, respectively.

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“…The preparing of CNT suspension requires to pay attention to the type and concentration of used CNT, type and concentration of plasticizer used to distribute nanotubes, parameters of homogenizer etc. [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Modification of cement systems by carbon nanotubes

Skripkiūnas¹

2019

CAN

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The nanoparticles and nanostructures such as nano silica, nano metakaolin, titanium dioxide and aluminium oxide nanoparticles, graphite nanomaterials, carbon nanotubes are used for modification of composite materials in construction industry. The considerable attention of researchers is focused on the investigation of cement systems modified by carbon nanotubes (CNT). The present research describes the generalized data about modification of cement systems by CNT suspension in fresh and hardened state. The influence of carbon nanotubes on setting time of cement paste, rheological and mechanical properties of nanomodified cement systems are demonstrated in the present research.

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Effect of superplasticizer type and siliceous materials on the dispersion of carbon nanotube in cementitious composites

Cited by 55 publications

References 38 publications

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

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

The Effect of the Electrical Conductivity of Superplasticizers on the Fluidity and Early Hydration Parameters of Cement Paste

Modification of cement systems by carbon nanotubes

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