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Fly Ash/Paraffin Composite Phase Change Material Used to Treat Thermal and Mechanical Properties of Expansive Soil in Cold Regions

Yong Chen1, Yinghao Huang1,2,*, Min Wu1 and Shuo Wang1

1 Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing, 210024, China
2 State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Science, Nanjing, 210029, China

* Corresponding Author:Yinghao Huang. Email: email

Journal of Renewable Materials 2022, 10(4), 1153-1173. https://doi.org/10.32604/jrm.2022.018856

Abstract

Phase change materials (PCMs) can store large amounts of energy in latent heat and release it during phase changes, which could be used to improve the freeze-thaw performance of soil. The composite phase change material was prepared with paraffin as the PCM and 8% Class C fly ash (CFA) as the supporting material. Laboratory tests were conducted to reveal the influence of phase change paraffin composite Class C fly ash (CFA-PCM) on the thermal properties, volume changes and mechanical properties of expansive soil. The results show that PCM failed to establish a good improvement effect due to leakage. CFA can effectively adsorb phase change materials, and the two have good compatibility. CFA-PCM reduces the volume change and strength attenuation of the soil, and 8 wt.% PCM is the optimal content. CFA-PCM turns the phase change latent heat down of the soil and improves its thermal stability. CFA-PCM makes the impact small of freeze-thaw on soil pore structure damage and improves soil volume change and mechanical properties on a macroscopic scale. In addition, CFA-8 wt.% PCM treated expansive soil has apparent advantages in resisting repeated freeze-thaw cycles, providing a reference for actual engineering design.

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APA Style
Chen, Y., Huang, Y., Wang, M.W.A.S. (2022). Fly ash/paraffin composite phase change material used to treat thermal and mechanical properties of expansive soil in cold regions. Journal of Renewable Materials, 10(4), 1153-1173. https://doi.org/10.32604/jrm.2022.018856
Vancouver Style
Chen Y, Huang Y, Wang MWAS. Fly ash/paraffin composite phase change material used to treat thermal and mechanical properties of expansive soil in cold regions. J Renew Mater. 2022;10(4):1153-1173 https://doi.org/10.32604/jrm.2022.018856
IEEE Style
Y. Chen, Y. Huang, and M.W.A.S. Wang "Fly Ash/Paraffin Composite Phase Change Material Used to Treat Thermal and Mechanical Properties of Expansive Soil in Cold Regions," J. Renew. Mater., vol. 10, no. 4, pp. 1153-1173. 2022. https://doi.org/10.32604/jrm.2022.018856

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cc This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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