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Experimental Study on Mechanical and Thermal Properties of Backfill Body with Paraffin Added

Author

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  • Xiaoyan Zhang

    (College of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Ziyi Han

    (College of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Lang Liu

    (College of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mines and Hazards Prevention, Ministry of Education of China, Xi’an 710054, China)

  • Xiang Xia

    (Shenzhen University Architectural Design Research Co., Ltd Xi’an Branch, Xi’an 710077, China)

  • Qingjiang Liu

    (College of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Yiran Duan

    (College of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Xuan Wang

    (College of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China)

Abstract

Based on phase-change heat storage backfill, paraffin microcapsules were selected as the phase change material and were directly mixed with backfill materials for preparing backfill specimens. The mechanical and thermal properties of specimens with different paraffin percentages and slurry concentrations were tested and analyzed. The results show that compressive strength gradually decreases with an increasing paraffin percentage while it significantly increases with increasing slurry concentration, thermal conductivity decreases with increasing paraffin percentage and specific heat capacity increases with an increasing paraffin percentage and slurry concentration. For a paraffin percentage from 0% to 10%, compressive strength decreases by an average of 22.5%, thermal conductivity decreases by an average of 43.8% and specific heat capacity increases by an average of 8.7% at a phase-change temperature of 30 °C. For a slurry concentration from 68% to 72%, compressive strength increases by an average of 4.12 times, and specific heat capacity increases by an average of 3.5% at a phase-change temperature of 30 °C. The weakening effect of phase-change materials on compressive strength can be effectively improved by the increase of slurry concentration, and the increases of paraffin percentage and slurry concentration can both improve the sensible heat storage capacity of backfill materials.

Suggested Citation

  • Xiaoyan Zhang & Ziyi Han & Lang Liu & Xiang Xia & Qingjiang Liu & Yiran Duan & Xuan Wang, 2023. "Experimental Study on Mechanical and Thermal Properties of Backfill Body with Paraffin Added," Energies, MDPI, vol. 17(1), pages 1-13, December.
    • Handle: RePEc:gam:jeners:v:17:y:2023:i:1:p:217-:d:1311118
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    References listed on IDEAS

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    1. Yu, Kunyang & Liu, Yushi & Yang, Yingzi, 2021. "Review on form-stable inorganic hydrated salt phase change materials: Preparation, characterization and effect on the thermophysical properties," Applied Energy, Elsevier, vol. 292(C).
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