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Laboratory Assessment on the Thermal Conductivity Behavior of Biopolymer Hydrogel, Graphite, and Fly Ash Mixture
  • Lee, Hwijae ;
  • Kim, Gi Yun ;
  • Lee, Haejin ;
  • Lee, Sojeong ;
  • Chang, Ilhan
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Publication Year
2024-01-01
Journal
Geotechnical Special Publication
Publisher
American Society of Civil Engineers (ASCE)
Citation
Geotechnical Special Publication, Vol.2024-February No.GSP 348, pp.369-375
Mesh Keyword
Additive contentsAdmixtureCable tunnelsFly ash mixturesHigh thermal conductivityLaboratory assessmentMeasurement systemSoil thermal conductivityThermal conductivity measurementsThermal dissipation
All Science Classification Codes (ASJC)
Civil and Structural EngineeringArchitectureBuilding and ConstructionGeotechnical Engineering and Engineering Geology
Abstract
This study aims to assess feasibility of microbial biopolymer application to enhance thermal dissipation efficiency of backfill soils surrounding underground electricity cable tunnels. In detail, microbial biopolymer, graphite, and fly ash were suggested as additional additives, and different combinations of additives were assessed through a laboratory thermal conductivity measurement system. The effects of additive content on soil-additive admixture and water content were evaluated. The soil-biopolymer mixture has 15.2% higher thermal conductivity at 20% water content than untreated soil, but is 11.3% lower at 10% water content, so the biopolymer itself does not significantly contribute to the improvement of soil thermal conductivity. However, in the case of the soil-biopolymer-graphite mixture, the thermal conductivity increased by up to 46.4% compared to the untreated soil at a water content of 20%, which was 16.9% higher than that of the soil-graphite mixture. This is due to the pore-clogging behavior of the microbial biopolymer.
ISSN
0895-0563
Language
eng
URI
https://aurora.ajou.ac.kr/handle/2018.oak/37114
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85186737603&origin=inward
DOI
https://doi.org/10.1061/9780784485309.038
Journal URL
http://ascelibrary.org/
Type
Conference
Funding
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2022R1A2C2091517).
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Chang, Il Han장일한
Department of Civil Systems Engineering
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