Development of artificial geopolymer aggregates with thermal energy storage capacity

Yi Fang, Muhammad Riaz Ahmad, Jian Cong Lao, Lan Ping Qian, Jian Guo Dai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

22 Citations (Scopus)


Integrating phase change materials (PCMs) into building materials has been widely used to improve the energy efficiency of buildings, in which microencapsulation and shape stabilization of PCMs are considered as two most effective solutions. In this study, artificial geopolymer aggregate (GPA) was employed as a novel PCM carrier for energy storage purposes. Detailed investigations were conducted into the physical, mechanical, and thermal properties of GPA-PCM, which can be engineered through different raw material selections (e.g., slag content, water/binder ratio, and incineration bottom ash (IBA) content). It was demonstrated that increasing the IBA content is an efficient means to increase the porosity of GPA, an index of the capacity to accommodate PCM. Up to 16 wt% PCM could be absorbed into the GPA through vacuum suction, resulting in a significant melting enthalpy of 24.74 J/g. Besides, GPA-PCM could achieve an excellent mechanical strength greater than 53.2 MPa and thermal conductivity of 0.510–0.589 W/mK. The time-temperature history curves of GPA revealed that up to 10.5 °C of thermal regulation was achieved due to PCM impregnation. The developed GPA-PCM composites facilitate an innovative and low-carbon solution for utilizing PCMs in construction for temperature-regulating and energy-saving purposes.

Original languageEnglish
Article number104834
JournalCement and Concrete Composites
Publication statusPublished - Jan 2023


  • Artificial geopolymer aggregates
  • Energy storage
  • Mechanical properties
  • Phase change materials
  • Thermal performance

ASJC Scopus subject areas

  • Building and Construction
  • General Materials Science


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