4.6 Article

Potential Applications of Phase Change Materials to Extend the Winter Construction Time of Earth-Rock Dam in Cold Regions

期刊

出版社

ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)MT.1943-5533.0003818

关键词

Earth-rock dam construction; Core-wall clay; Phase change material; Frost resistance; Working performance; Thermal energy storage

资金

  1. National Natural Science Foundation of China [51979189]
  2. National Key Research and Development Program of China [2018YFC0406903]

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This research developed PCM-clay to improve construction efficiency in cold regions, and verified its feasibility and protection effectiveness in a simulated environment, demonstrating its potential as a temperature control solution.
During earth-rock dam construction, temperature control to reduce the freeze-thaw impact on core-wall clay in cold regions is difficult. To address this challenge, this research developed a phase change material (PCM) incorporated into clay (PCM-clay) to improve the construction efficiency in a cold period. In the preparation of PCM-clay, considerable latent heat was stored by harvesting thermal energy from the environment, which was used for temperature control to extend the winter construction time. The feasibility of PCM-clay as core-wall clay was verified by an analysis of working performance. The results indicate that low-content PCM-clay (7%) is able to protect core-wall clay from freeze-thaw damage in a simulated environment (minimum temperature=-4.3 degrees C) in a 1-day cycle. The working performance (e.g., shear strength and impermeability) supports that PCM-clay is a promising solution for temperature control of core-wall clay during earth-rock dam construction in cold regions. (C) American Society of Civil Engineers.

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