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<p>This study introduces a novel approach by integrating microencapsulated phase change (MPC) materials into engineered geopolymer composites (EGCs), aiming to enhance thermal energy storage capabilities. This investigation highlights optimized MPC content for improved mechanical strength and reduced water absorption and shrinkage. Natural zeolite and quicklime served as binders, and the effects of MPC on mechanical, thermal, and physical properties were assessed using standardized tests alongside differential scanning calorimetry (DSC), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy with energy-dispersive X-ray analysis (SEM-EDX). Results showed that 20% MPC content yielded optimal improvements in compressive and flexural strength, being 80.27% and 57.14%, respectively, higher than the control mix without MPCs. Capillary water absorption (CWA) and drying shrinkage (DS) were significantly reduced, with the sorptivity coefficient (k) decreasing by 13.65% and DS dropping from 5187&#xa0;µm/m to 3976&#xa0;µm/m, depicting a 23.35% reduction. These enhancements were attributed to gel formation (C/N-A-S-H), pore filling, and the micro-filling effect of MPC, further supported by thermal curing. The microstructural analysis confirmed uniform MPC dispersion and gel formation. The EGC mix with 30% MPC demonstrated effective thermal storage, with melting/freezing points at 26.51°C and 23.33°C and latent heats of 16.79&#xa0;J/g and 16.37&#xa0;J/g, respectively, underscoring its potential for sustainable, energy-efficient construction.</p>

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Influence of Phase Change Material on Material Characterization and Thermal Behavior of Engineered Geopolymer Composite

  • 期刊论文

  • 发表日期：

    2025年8月25日

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  • Nabil Ben Kahla,
  • Nejib Ghazouani,
  • Ali Raza

摘要

This study introduces a novel approach by integrating microencapsulated phase change (MPC) materials into engineered geopolymer composites (EGCs), aiming to enhance thermal energy storage capabilities. This investigation highlights optimized MPC content for improved mechanical strength and reduced water absorption and shrinkage. Natural zeolite and quicklime served as binders, and the effects of MPC on mechanical, thermal, and physical properties were assessed using standardized tests alongside differential scanning calorimetry (DSC), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy with energy-dispersive X-ray analysis (SEM-EDX). Results showed that 20% MPC content yielded optimal improvements in compressive and flexural strength, being 80.27% and 57.14%, respectively, higher than the control mix without MPCs. Capillary water absorption (CWA) and drying shrinkage (DS) were significantly reduced, with the sorptivity coefficient (k) decreasing by 13.65% and DS dropping from 5187 µm/m to 3976 µm/m, depicting a 23.35% reduction. These enhancements were attributed to gel formation (C/N-A-S-H), pore filling, and the micro-filling effect of MPC, further supported by thermal curing. The microstructural analysis confirmed uniform MPC dispersion and gel formation. The EGC mix with 30% MPC demonstrated effective thermal storage, with melting/freezing points at 26.51°C and 23.33°C and latent heats of 16.79 J/g and 16.37 J/g, respectively, underscoring its potential for sustainable, energy-efficient construction.