Correlation analysis of heating performance and electrical energy of multi-walled carbon nanotubes cementitious composites at sub-zero temperatures

Lee, Heeyoung; Park, Seonghoon; Cho, Sanghyeon; Chung, Wonseok

doi:10.1016/j.compstruct.2020.111977

Cited by 14 publications

(4 citation statements)

References 34 publications

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“…The coarse aggregate ratio was set at 40, 60, and 80% of the total aggregate weight, within a 20% range from the general weight ratio [27]. The MWCNT concentration was 0.25, 0.5, and 1.0 wt.% relative to the weight of cement [5][6][7]. The W/C ratio was set at 50, 55, and 60% based on KCS 14 20 10 [28].…”

Section: Heat Generation Test Overviewmentioning

confidence: 99%

“…The test specimens were produced with 0.125 and 0.25 wt.% of MWCNTs relative to the weight of cement, with the applied voltage set to 50 and 100 V. The MWCNT coating on fine aggregate produced a better heating performance than that of MWCNTs dispersed in an aqueous solution. Furthermore, Lee et al [7] evaluated the heating performance of MWCNT-mixed cementitious composites at sub-zero temperatures by analyzing the mixing concentration of MWCNTs. The heating performances by the cementitious composites mixed with 1.0 wt.% MWCNTs increased by 51.4 times compared to those of specimens mixed with 0.1 wt.% MWCNTs.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Coarse Aggregate and Multi-Wall Carbon Nanotubes on Heat Generation of Concrete

Yun,

Kim,

Kang

et al. 2023

Buildings

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Many researchers are developing heating construction materials to remove black ice from roads, addressing the scientific challenges associated with this issue. The use of carbon-based nanomaterials in concrete is of great interest due to the excellent electrical and thermal conductivity of this material. In this study, the incorporation of multi-walled carbon nanotubes (MWCNTs) into concrete compositions results in the formation of MWCNT bridge networks. MWCNTs exhibit a low specific heat and possess the ability to promptly generate raised temperatures with minimal power input. This characteristic has the potential to induce temperature variations in concrete. The heat generation test parameters for MWCNT concrete included the mixing concentration of the MWCNTs, the mixing ratio of coarse aggregate, the water/cement (W/C) ratio, and the presence or absence of superplasticizers. The heating performance of concrete was found to improve as the mixing concentration of the MWCNTs increased, while a heating performance decrease was observed as the mixing ratio of coarse aggregate increased, owing to the reduced dispersibility of the MWCNTs. Conversely, the heating performance improved when the W/C ratio increased due to the enhanced dispersibility of the MWCNTs. Moreover, superplasticizers assist in dispersing MWCNTs, thereby improving the heating performance. Additionally, field emission scanning electron microscopy revealed that MWCNTs form a bridge network between the cement hydrates. As a result of this study, the maximum temperature variation of concrete mixed with MWCNTs was up to 73.6 °C. Therefore, by mixing MWCNT aqueous solutions with concrete and using an appropriate W/C ratio and superplasticizer, a new construction material capable of enhanced heating performance was developed.

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Section: Heat Generation Test Overviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Coarse Aggregate and Multi-Wall Carbon Nanotubes on Heat Generation of Concrete

Yun,

Kim,

Kang

et al. 2023

Buildings

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“…MWCNTs with a purity of 99%, a diameter of 0.5-1.0 nm, a length of 100 nm to 1 cm, and in a functionalized aqueous solution state were used [30][31][32]. The MWCNT solution was dispersed using 22 kHz ultrasonic waves in a polyacrylic acid copolymer for 2 h [13,33]. The properties of the MWCNTs used in this study are listed in Table 2.…”

Section: Experimental Programmentioning

confidence: 99%

“…In addition, a thermocouple was inserted at a depth of 1 cm to measure the temperature inside the composites (Figure 3f). After curing the composites for 1 d at room temperature, they were de-molded and dry cured in a dry oven at 45 • C [33]. For the specimens with damage, the Styrofoam was removed from the de-molded specimen before dry curing.…”

Section: Experimental Programmentioning

confidence: 99%

Damage Detection of Carbon Nanotube Cementitious Composites Using Thermal and Electrical Resistance Properties

Lee

Chung

2021

Applied Sciences

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This study aimed to detect damage based on thermal and electrical resistance properties by fabricating composites in which multi-walled carbon nanotubes (MWCNTs) and cement-based materials are mixed. The experimental parameters used were the cement-based material type, MWCNT concentration, curing period, and presence of damage. The experimental results showed that damage in cement paste can be detected using the heat property at every MWCNT concentration, and damage in mortar can be detected at MWCNT concentrations of ≤0.25 wt%. However, damage to concrete is difficult to detect using the heat property. Damage to cement paste, mortar, and concrete can be detected at every concentration using the electrical resistance property. Furthermore, field emission scanning electron microscopy (FE-SEM) results revealed uniformly dispersed MWCNTs inside the composites without agglomeration or the formation of carbon nanotube (CNT) networks.

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A review of electrically conductive concrete heated pavement system technology: From the laboratory to the full-scale implementation

Rahman

Malakooti

Ceylan

et al. 2022

Construction and Building Materials

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Correlation analysis of heating performance and electrical energy of multi-walled carbon nanotubes cementitious composites at sub-zero temperatures

Cited by 14 publications

References 34 publications

Effect of Coarse Aggregate and Multi-Wall Carbon Nanotubes on Heat Generation of Concrete

Effect of Coarse Aggregate and Multi-Wall Carbon Nanotubes on Heat Generation of Concrete

Damage Detection of Carbon Nanotube Cementitious Composites Using Thermal and Electrical Resistance Properties

A review of electrically conductive concrete heated pavement system technology: From the laboratory to the full-scale implementation

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