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<p>The incorporation of microencapsulated phase change materials (MPCM) into cement-based materials has been a notable preference for passive storage of thermal energy in buildings. Existing researches show that the properties of cementitious materials will be dramatically affected due to the incorporation of microencapsulated PCM (MPCM). In this work, MPCM with n-octadecane as the core and SiO<sub>2</sub> as the shell in nano-scale (Nano-MPCM) and micro-scale (Micro-MPCM) was synthesized and their effect on hydration and volume deformation of cement-based materials was systematically evaluated. The results showed that MPCM acts as a heterogeneous nucleation site and reduces the apparent activation energy of hydration, thus it accelerates the hydration process of cement. The hydration heat and chemical shrinkage of Nano-MPCM dosed pastes are higher than that of Micro-MPCM. The drying shrinkage is positively correlated with the dosage of Nano-MPCM, but inversely correlated with the dosage of Micro-MPCM. At a volume fraction of 15%, Nano MPCM and Micro MPCM can reduce the thermal deformation of cement mortars by approximately 77% and 50%, respectively.</p>

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Comparative effects of micro- versus nano- silica phase change capsules on hydration and thermal deformation of cement composites

  • 期刊论文

  • 发表日期：

    2026年5月14日

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  • Wenjuan Miao,
  • Jun Chen,
  • Yipeng Zhou,
  • Jiazhen Gao,
  • Yingbin Wang,
  • Xiangguo Li

摘要

The incorporation of microencapsulated phase change materials (MPCM) into cement-based materials has been a notable preference for passive storage of thermal energy in buildings. Existing researches show that the properties of cementitious materials will be dramatically affected due to the incorporation of microencapsulated PCM (MPCM). In this work, MPCM with n-octadecane as the core and SiO2 as the shell in nano-scale (Nano-MPCM) and micro-scale (Micro-MPCM) was synthesized and their effect on hydration and volume deformation of cement-based materials was systematically evaluated. The results showed that MPCM acts as a heterogeneous nucleation site and reduces the apparent activation energy of hydration, thus it accelerates the hydration process of cement. The hydration heat and chemical shrinkage of Nano-MPCM dosed pastes are higher than that of Micro-MPCM. The drying shrinkage is positively correlated with the dosage of Nano-MPCM, but inversely correlated with the dosage of Micro-MPCM. At a volume fraction of 15%, Nano MPCM and Micro MPCM can reduce the thermal deformation of cement mortars by approximately 77% and 50%, respectively.