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The high energy consumption in buildings has become a global concern. Phase Change Materials (PCM) offer a potential solution for enhancing building energy efficiency, as they help stabilize indoor temperatures, thereby reducing the need for artificial heating, ventilation, and air conditioning systems. In this study, a bio-based PCM was impregnated into Rice Husk (RH) to produce bio-aggregates, which were then incorporated into lime-cement earth mortar. Due to its porous structure, RH is capable of absorbing and retaining PCM, acting as a carrier, resulting in the formation of shape-stabilized RH-PCM. The physical properties (including density and water absorption) of the bio-aggregate were assessed. RH-PCM was incorporated into the mortars at contents of 4% and 8% to assess its influence on the mechanical behaviour. Mixtures containing only RH (without PCM) were also evaluated for comparison. The study analysed both flexural and compressive strength. The results indicated that the incorporation of PCM into the RH reduced the water absorption of the bio-aggregate. Also, the bio-aggregates (both RH and RH-PCM) led to a reduction in compressive strength compared to the control mortar (without bio-aggregates). However, the inclusion of PCM into RH did not significantly impair the mechanical performance of the mixtures when compared to mortars containing only RH.

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Development and Characterization of Rice Husk Shape-Stabilized Phase Change Material and Its Impacts on the Mechanical Performance of Earth Mortars

  • 会议论文

  • 发表日期：

    2025年

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  • Lucas Caon Menegatti,
  • Romildo Dias Toledo Filho

摘要

The high energy consumption in buildings has become a global concern. Phase Change Materials (PCM) offer a potential solution for enhancing building energy efficiency, as they help stabilize indoor temperatures, thereby reducing the need for artificial heating, ventilation, and air conditioning systems. In this study, a bio-based PCM was impregnated into Rice Husk (RH) to produce bio-aggregates, which were then incorporated into lime-cement earth mortar. Due to its porous structure, RH is capable of absorbing and retaining PCM, acting as a carrier, resulting in the formation of shape-stabilized RH-PCM. The physical properties (including density and water absorption) of the bio-aggregate were assessed. RH-PCM was incorporated into the mortars at contents of 4% and 8% to assess its influence on the mechanical behaviour. Mixtures containing only RH (without PCM) were also evaluated for comparison. The study analysed both flexural and compressive strength. The results indicated that the incorporation of PCM into the RH reduced the water absorption of the bio-aggregate. Also, the bio-aggregates (both RH and RH-PCM) led to a reduction in compressive strength compared to the control mortar (without bio-aggregates). However, the inclusion of PCM into RH did not significantly impair the mechanical performance of the mixtures when compared to mortars containing only RH.