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Title |
Laboratory Experiment to Investigate Heat Capacity of Nanoconcrete Using Graphene Oxide
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Authors |
안성권(Sung Kwon Ahn) ; 방춘석(Chun Seok Bang) ; 강윤석(Yoon Seok Kang) ; 신윤지(Yun-ji Shin) ; 설유강(Yoo-Kang Seol) |
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DOI |
https://doi.org/10.4334/JKCI.2024.36.3.187 |
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Keywords |
도시열섬현상; 열전도도; 열확산도; 평판열류계; 시차주사열량계 urban heat island effect; thermal conductivity; thermal diffusivity; hot disk transient plane source; differential scanning calorimetry |
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Abstract |
The Earth’s temperature has risen more than 1 °C since the pre-industrial era, with an even more significant increase in urban areas during the summer due to the urban heat island effect, making air conditioning a common practice. However, there is a significant problem with the huge power consumption and subsequent greenhouse gas emissions associated with air conditioning. Therefore, to achieve carbon neutrality and mitigate the urban heat island effect, it is essential to use materials with good insulation properties to reduce energy consumption. This paper describes the process and results of experiments conducted to evaluate the feasibility of improving the thermal performance of concrete using moisture-absorbing nanomaterials. The thermal performance of nanoconcrete specimens with 0.08~0.24 % graphene oxide admixture was assessed using the hot disk transient plane source method. The thermal conductivity was calculated according to relevant international standards and verified using the thermal diffusivity equation. The thermal conductivity of nanoconcrete was found to be 1.5~1.9 W/m°C, while that of conventional concrete was 2.4~2.5 W/m°C, suggesting a 20~40 % reduction in thermal conductivity for nanoconcrete compared to conventional concrete. Additionally, differential scanning calorimetry was used to measure heat exchange during heating. While conventional concrete absorbed heat only up to about 75 °C, nanoconcrete absorbed heat up to approximately 100 °C, indicating a higher heat absorption capacity compared to conventional concrete. This work demonstrates that the thermal conductivity decreased, and the heat absorption increased with increasing graphene oxide content. The work also proposes further research, including numerical analysis using molecular dynamic simulations and experimental analysis using improved hydrophilic surface functional groups
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