Heating Experiment of CNT Cementitious Composites with Single-Walled and Multiwalled Carbon Nanotubes

Lee, Heeyoung; Kang, Dong Hoon; Song, Young Min; Chung, Wonseok

doi:10.1155/2017/3691509

Cited by 20 publications

(11 citation statements)

References 24 publications

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“…The potential for utilizing the excellent mechanical properties, electrical conductivity, and heat conductivity of CNTs to modify and functionalize various materials has been studied [2][3][4][8][9][10][11][12][13][14][15][16][17][18]. While CNTs can be readily incorporated in polymer-based nanocomposites, it becomes considerably more challenging to incorporate them in cementbased materials.…”

Section: Introductionmentioning

confidence: 99%

Thermal response characterization and comparison of carbon nanotube-enhanced cementitious composites

Lee

Song

Loh

et al. 2018

Composite Structures

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Carbon nanotubes (CNT) can be integrated with cement-based composites to modify their electrical and thermal characteristics. In this study, the objective is to characterize the thermal characteristics of CNT-based cement mortars cast using two unique CNT mixing methods. The mixing method, CNT content, curing age, and applied electrical excitation were systematically varied during experiments. The results of the temperature tests with the CNT cement mortars indicated that mixing CNTs in sand more effectively dispersed the CNTs throughout the mortar, and thus more effectively modified the thermal characteristics of CNT cement mortar. Furthermore, cross-sectional image analysis using field emission scanning electron microscopy supports increased coherence inside the cement due to strong covalent bonds with C-S-H, a hydrate from the temperature tests.

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Section: Introductionmentioning

confidence: 99%

Thermal response characterization and comparison of carbon nanotube-enhanced cementitious composites

Lee

Song

Loh

et al. 2018

Composite Structures

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“…Their electrical characteristics result from the unique electrical structure and linear one-dimensional structure of graphite; CNTs have low electrical resistance. Table 1 shows the physical properties of individual MWCNTs [21,22]. The average diameter of the MWCNTs was 9.5 nm and the average length was 1.5 µm.…”

Section: Characteristics Of Multi-walled Carbon Nanotubesmentioning

confidence: 99%

“…Researchers have investigated the excellent electrical and thermal conductivity afforded by CNTs to realize various functions based on heating characteristics [11][12][13][14][15][16][17][18][19][20]. Lee et al [21] fabricated cement mortar incorporating single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs); the authors experimentally studied the heating characteristics of different CNT types, concentrations, and mixing methods. The SWCNT cement mortar showed better heating characteristics than the MWCNT mix; however, as the CNT concentration increased, agglomeration occurred, and the heating characteristics degraded.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Detection Systems of Filling Rates Using Carbon Nanotube Cement Grout

Lee

Park

et al. 2019

Nanomaterials

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The addition of small amounts of carbon nanotubes (CNTs) to cement-based materials modifies their thermal and electrical characteristics. This study investigated the void detection and filling rates of cement grout with multi-walled carbon nanotubes (MWCNTs). MWCNT grouts of 40 mm × 40 mm × 160 mm were fabricated. Specimens were tested by thermal imaging, electrical resistance analyses, and magnetic field tests. The experimental parameters were the concentration of MWCNT and the grout filling rate. The filling rate was investigated by measuring resistance and magnetic field changes with respect to cross-sectional area, taking the voids into consideration. The results of the thermal image tests indicate that 1.0 wt % MWCNT cement grout is optimal for void detection.

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“…To overcome this problem, research was conducted to enhance the thermal conductivity of the materials themselves. Representative cases include the application of Carbon Nanofibers (CNFs) and Carbon Nanotubes (CNTs) [ 8 , 9 , 10 , 11 , 12 , 13 ]. Although CNFs/CNTs have a superior thermal conductivity of 3000 to 6000 W/mK [ 11 ], there were critical limits to improve the thermal conductivity of the cement composites.…”

Section: Introductionmentioning

confidence: 99%

“…Representative cases include the application of Carbon Nanofibers (CNFs) and Carbon Nanotubes (CNTs) [ 8 , 9 , 10 , 11 , 12 , 13 ]. Although CNFs/CNTs have a superior thermal conductivity of 3000 to 6000 W/mK [ 11 ], there were critical limits to improve the thermal conductivity of the cement composites. Because CNFs/CNTs are a kind of fiber, therefore the CNFs/CNTs could not apply up to 2% of the volume fraction [ 8 , 9 , 10 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Thermal Conductive Materials on the Freeze-Thaw Resistance of Concrete

et al. 2021

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To solve the problem of black ice, many studies are being carried out. The key in recent days is enhancing the thermal conductivity of concrete. In this study, to improve the thermal conductivity, silicon carbide was used to substitute 50% and 100% of the fine aggregate. In addition, steel fiber is not only for enhancing the mechanical properties but could enhance thermal conductive material. Hence, the arched-type steel fiber was used up to a 1% volume fraction in this study. Furthermore, graphite was used for 5% of the volume fraction for enhancing the thermal conductivity. However, thermal damage would occur due to the difference in thermal conductivity between materials. Therefore, the thermal durability must be verified first. The target application of the concrete in this study was its use as road paving material. To evaluate the thermal durability, freeze–thaw and rapid cyclic thermal attacks were performed. The thermal conductivity of the specimens was increased with the increase in thermal conductive materials. Graphite has already been reported to have a negative effect on mechanical properties, and the results showed that this was the case. However, the steel fiber compensated for the negative effect of graphite, and the silicon carbide provided a filler effect. Graphite also had a negative effect on the freeze–thaw and rapid cyclic thermal attack, but the steel fiber compensated for the reduction in thermal durability. The silicon carbide also helped to improve the thermal durability in the same way as steel fiber. Comprehensively, the steel fiber enhanced all of the properties of the tests. Using 100% silicon carbide was considered the acceptable range, but 50% of silicon carbide was the best. Graphite decreased all the properties except for the thermal conductivity. Therefore, the content of graphite or using other conductive materials used should be carefully considered in further studies.

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Heating Experiment of CNT Cementitious Composites with Single-Walled and Multiwalled Carbon Nanotubes

Cited by 20 publications

References 24 publications

Thermal response characterization and comparison of carbon nanotube-enhanced cementitious composites

Thermal response characterization and comparison of carbon nanotube-enhanced cementitious composites

Enhanced Detection Systems of Filling Rates Using Carbon Nanotube Cement Grout

Effects of Thermal Conductive Materials on the Freeze-Thaw Resistance of Concrete

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