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This study focuses on the effect of varying microstructures on the thermal and mechanical behavior of porous concrete impregnated with a phase change material (PCM), referred to as PoroPCM. This study involved the preparation of a PCM-embedded cement paste, which included a 20% volume replacement of paraffin-based melamine–formaldehyde-coated microencapsulated PCM. The prepared PCM-embedded cement paste was mixed with approximately 20%, 40%, and 60% volume substitutions of aerated foam to prepare the PoroPCM specimens. Two series of specimens were prepared by using two distinct mixing methods. One involved gentle mixing at low energy, whereas the other used a high-speed mixer. X-ray computed tomography (CT) was used to visualize the 3D microstructures of the PoroPCM specimens. The datasets extracted from X-ray CT scans were reconstructed to quantify the spatial distribution of the pore network and analyze their effects on the thermal and mechanical behaviors, which were used to understand the governing parameters with different pore networks. The thermal behavior was measured in a temperature-controlled environmental chamber by placing a thermocouple at the center of the 100 mm cube specimens. The results indicated a significant enhancement in the thermal performance (delay in temperature increase) of the PoroPCM specimens owing to the phase transition and heat storage capacity of the PCM particles. In addition, the thermal behavior appeared to be influenced by the porosity, size distribution of air voids, and internal moisture content, which were due to changes in the microstructure of the PoroPCM. Compressive strength tests revealed that the failure behavior of PoroPCM under compressive load was ductile with large deformation, and the failure propagated by disaggregation of a local collapse of the pore walls. The compressive strength might be influenced by porosity but may be free of the influence of pore sizes.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: PoroPCM, heat strage capacity

Date published: 2024-07-15

Publisher: Tsinghua University Press

Journal:

• Journal of Intelligent Construction (ISSN: 29583861)

Funding:

• JST 18072056 (EIG-Concert-Japan)

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.26599/jic.2025.9180076

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Updated at: 2024-12-16 12:30:35 +0900

Published on MDR: 2025-02-17 18:32:24 +0900