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

Xiaoyan Zhang (), Ziyi Han, Lang Liu, Xiang Xia, Qingjiang Liu, Yiran Duan and Xuan Wang
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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
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

Energies, 2023, vol. 17, issue 1, 1-13

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.

Keywords: heat storage; paraffin microcapsules; backfill specimens; compressive strength; thermal properties (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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