TY - JOUR
T1 - Development of artificial geopolymer aggregates with thermal energy storage capacity
AU - Fang, Yi
AU - Ahmad, Muhammad Riaz
AU - Lao, Jian Cong
AU - Qian, Lan Ping
AU - Dai, Jian Guo
N1 - Funding Information:
The authors would like to acknowledge the financial support received from NSFC/RGC Joint Research Scheme ( N_PolyU542/20 ), Hong Kong RGC General Research Fund (No. 15223120 ), and The Hong Kong Polytechnic University, Research Center for Resources Engineering towards Carbon Neutrality (No. BBC7 ).
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2023/1
Y1 - 2023/1
N2 - 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.
AB - 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.
KW - Artificial geopolymer aggregates
KW - Energy storage
KW - Mechanical properties
KW - Phase change materials
KW - Thermal performance
UR - http://www.scopus.com/inward/record.url?scp=85141238029&partnerID=8YFLogxK
U2 - 10.1016/j.cemconcomp.2022.104834
DO - 10.1016/j.cemconcomp.2022.104834
M3 - Journal article
AN - SCOPUS:85141238029
SN - 0958-9465
VL - 135
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
M1 - 104834
ER -