Influence of fly ash on the thermodynamic properties of graphite concrete

WANG Shuai; YUAN Chenghao; LÜ Ye

doi:10.20265/j.cnki.issn.1007-2993.2025-0150

Volume 40 Issue 4

Aug. 2026

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WANG Shuai, YUAN Chenghao, LÜ Ye. Influence of fly ash on the thermodynamic properties of graphite concrete[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2026, 40(4): 624-632. doi: 10.20265/j.cnki.issn.1007-2993.2025-0150

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WANG Shuai, YUAN Chenghao, LÜ Ye. Influence of fly ash on the thermodynamic properties of graphite concrete[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2026, 40(4): 624-632. doi: 10.20265/j.cnki.issn.1007-2993.2025-0150

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Influence of fly ash on the thermodynamic properties of graphite concrete

doi: 10.20265/j.cnki.issn.1007-2993.2025-0150

Engineering Management Branch of State Grid Jibei Electric Power Co., Ltd., Beijing 100071, China

Received Date: 2025-04-01
Accepted Date: 2025-08-25
Rev Recd Date: 2025-07-14
Publish Date: 2026-08-08

Abstract

Abstract

Energy piles integrate building pile foundations with ground-source heat pump technology, bearing building loads while also harnessing shallow geothermal energy. This study focuses on optimizing the strength and thermophysical parameters of graphite concrete through the incorporation of graphite and fly ash. Experimental results indicate that a graphite content of 5% yields the best performance, as the addition of graphite enhances heat transfer but its brittle structure adversely affects concrete strength and density. Meanwhile, a fly ash content ranging from 5%～10%, not only significantly boosts the compressive strength of the concrete but also improves its workability and water retention. However, as the fly ash content increases, the thermal conductivity of the graphite concrete gradually decreases, with a 10% fly ash content marking a turning point in this trend. Verification through the construction of a scale model of an energy pile confirms that graphite-fly ash heat transfer-enhanced energy piles can effectively facilitate heat exchange throughout the circulating fluid within the embedded pipes of the pile foundation. This study recommends a graphite content of 5% and a fly ash content of 10%.
- energy pile,
- graphite concrete,
- fly ash,
- heat transfer enhancement,
- scale model

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References

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Influence of fly ash on the thermodynamic properties of graphite concrete

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