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Thermophysical and Microstructural Behavior of Microencapsulated Phase Change Material-Incorporated Fly Ash Bricks for Thermal Energy Storage in Building Applications
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DOI：10.1002/est2.70424.png)
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Abstract
En 中文
The incorporation of microencapsulated phase change material (MPCM) into fly ash bricks gives a practical strategy to balance structural performance and improve thermal energy storage in building materials. This study evaluates the impact of MPCM incorporation at 0%, 5%, 10%, and 15% by weight after 28 days of curing, followed by analysis of mechanical properties including thermogravimetric analysis, x-ray diffraction, and field emission scanning electron microscopy. This revealed that 10% incorporation of MPCM in fly ash brick leads to a rise in the strength to approximately 5 MPa at 7 days and peaks at 14.6 MPa by 28 days, with further increase in the dosages showing deterioration of the sample. The MPCM incorporation increases the pore volume and overall water absorption from 15% in control to nearly 31% at 15% of MPCM. This also results in reduced density and elevated moisture content. Thermal analyses show a decrease in thermal conductivity, which is explained by greater porosity and PCM's intrinsically low conductivity. At 15% MPCM, specific heat capacity increases dramatically from ~0.9 J/kg °C in control bricks to ~1.85 J/kg °C, indicating improved thermal buffering. Microstructural analysis confirms that an increase in the MPCM content disrupts the compactness, further affecting the mechanical integrity. The involvement of MPCM enhances the thermal properties of building applications, yet its application within the fly ash system remains insufficiently researched. Utilizing fly ash as a primary raw material further promotes sustainability through effective industrial waste valorization. Consequently, MPCM-based fly ash bricks (10%) emerge as a promising, eco-efficient solution for next-generation smart building materials.
Keywords:
brick
fly ash
microencapsulation
microstructure analysis
PCM
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