Enhanced thermo-mechanical properties of cementitious composites via red mud-based microencapsulated phase change material: Towards energy conservation in building

Kunyang Yu, Minjie Jia, Weichen Tian, Yingzi Yang and Yushi Liu

Energy, 2024, vol. 290, issue C

Abstract: Integrating microencapsulated phase change materials (PCMs) into cement-based materials can endow building with huge heat storage capacity. Nevertheless, cement-based materials containing microencapsulated PCMs universally behave deteriorated mechanical and heat transfer properties. In this study, a capric acid and paraffin eutectic PCM (CA-PA) was prepared, and it had a large latent heat (143.4 J/g) with the suitable melting point (27.1 °C) used for building applications. Then, a novel microencapsulated PCM was proposed by the three-step method including the construction of red mud-based geopolymer hollow microsphere (RMHM), the impregnation of CA-PA and the surface grafting of nano-SiO2. A comparative study was performed to unveil the influence mechanism of different surface properties of the synthetic red mud-based microencapsulated PCMs (namely CA-PA/RMHM and CA-PA/RMHM@SiO2) on the microstructure, mechanical and thermal properties of cement mortar. It turned out that the 28d compressive strength and thermal conductivity of the cement mortar with replacing 20 % sand by CA-PA/RMHM were 26.7 MPa and 0.7165 W/m·K, which were increased by 41.6 % and 14.7 % due to introducing nano-SiO2 coating. Besides, energy and environmental assessment indicated that using mortar with CA-PA/RMHM@SiO2 in building had good energy saving performance and great potentials for emission reduction.

Keywords: Phase change materials; Heat storage capacity; Cement-based materials; Energy conservation; Emission reduction (search for similar items in EconPapers)
Date: 2024
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:290:y:2024:i:c:s0360544224000720

DOI: 10.1016/j.energy.2024.130301

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