Enhanced Detection Systems of Filling Rates Using Carbon Nanotube Cement Grout

Lee, Heeyoung; Park, Seonghoon; Park, Sang Gyu; Chung, Wonseok

doi:10.3390/nano10010010

Cited by 9 publications

(8 citation statements)

References 39 publications

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“…According to the literature, several attempts have been carried out over the years to develop thermally enhanced grouts by using carbon nanotubes as nano-scaled additives. Lee et al incorporated different concentrations of multi-walled carbon nanotubes (MWCNTs) into a grout consisting of cement, sand, and a surfactant, resulting in an improvement of the electrical resistance of 1.0% MWCNT-based grout with the filling rates of 100%, 75%, 50%, and 25% as 0.449, 0.575, 0.846, and 0.934 kΩ, respectively [5]. In another study, Zhang and Li produced a cement-based composite for a thermally conductive layer in a deicing road system by integrating 3 wt% MWCNT and obtained a thermal conductivity of 2.83 W/mK [6].…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effect of Expanded Graphite-Silane Functionalized Silica as a Hybrid Additive in Improving the Thermal Conductivity of Cementitious Grouts with Controllable Water Uptake

et al. 2020

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Recently, a growing demand for geothermal applications has led to the exploitation of energy efficiently by developing grouting materials in the borehole between pipes and the ground. Therefore, the current study developed newly formulated cementitious grouts by the integration of expanded graphite (EG)-based hybrid additives synthesized by building chemical bridges between silica particles and EG in the presence of amino functional silane coupling agents. These produced hybrid additives with controlled EG and silica ratios were utilized in grout mixtures used in borehole heat exchangers to enhance the thermal conductivity. According to the optimization study on the formulation development of grout mixtures with bentonite, silica sands, cement, and superplasticizer by adding neat EG and EG-based hybrids, the relationship between the carbon amount and water demand was found to have a significant impact on thermal conductivity. The highest thermal conductivity value of 2.656 W/mK was achieved by the incorporation of 5 wt% hybrid additive with the ratio silica/EG of 1:5 compared to the reference grout, which showed a thermal conductivity of 2.373 W/mK. Therefore, the enhancement in thermal conductivity was dependent on the increase in the EG content and also the additive loading ratio, resulting in a slight increase in the water demand.

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Section: Introductionmentioning

confidence: 99%

Synergistic Effect of Expanded Graphite-Silane Functionalized Silica as a Hybrid Additive in Improving the Thermal Conductivity of Cementitious Grouts with Controllable Water Uptake

et al. 2020

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“…Ordinary Portland cement of American Society for Testing Materials Type I was used for all the composites [28,29]. 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].…”

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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“…In subsequent laboratory studies related to heating cementitious composites, specimens were prepared in various sizes (instead of using simple cubic-type specimens) to analyze the effects of size [18][19][20][21][22][23][24][25][26]. To explain some of the studies, the thermal performance of heating cementitious composites mixed with CNTs were analyzed using specimens with a length of 100 mm, a width of 20 mm, and a height of 20 mm.…”

Section: Introductionmentioning

confidence: 99%

A Full-Scale Test on Enhancing the Thermal Performance of a Concrete Slab Embedded with a MWCNT Heating Module Exposed to an Outdoor Environment

Park,

Hwang,

Lee

et al. 2024

Buildings

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The aberrant winter temperatures resulting from climatic shifts give rise to the formation of imperceptible black ice on road surfaces, posing a risk of accidents. In this study, a carbon nanotube (CNT)-based heating module was fabricated, embedded in a concrete slab, and subjected to a full-scale test in an outdoor environment. Preliminary tests were conducted to scrutinize the thermal behavior of the CNT heating modules applied to the concrete slab, considering the inter-module distance and the concentration of multiwalled carbon nanotubes (MWCNTs) in the concrete perimeter. A full-scale concrete slab was fabricated on the basis of the preliminary test results. Thermal performance analyses of the concrete perimeter were performed according to the MWCNT concentration, the distance between the MWCNT heating modules, and the supply voltage based on a full-scale test conducted in an outdoor environment. The full-scale test results indicated that the maximum temperature variation of the MWCNT heating module embedded concrete slab was 46.8 °C, and its thermal performance varied by 1.9 times depending on the concentration of MWCNTs in the concrete perimeter.

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Enhanced Detection Systems of Filling Rates Using Carbon Nanotube Cement Grout

Cited by 9 publications

References 39 publications

Synergistic Effect of Expanded Graphite-Silane Functionalized Silica as a Hybrid Additive in Improving the Thermal Conductivity of Cementitious Grouts with Controllable Water Uptake

Synergistic Effect of Expanded Graphite-Silane Functionalized Silica as a Hybrid Additive in Improving the Thermal Conductivity of Cementitious Grouts with Controllable Water Uptake

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

A Full-Scale Test on Enhancing the Thermal Performance of a Concrete Slab Embedded with a MWCNT Heating Module Exposed to an Outdoor Environment

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