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Title |
The Material Characteristics of Ultra-high Performance Concrete for Thermal Energy Storage Media at High Temperature
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Authors |
박지훈(Jihun Park) ; 양인환(In-Hwan Yang) |
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DOI |
https://doi.org/10.4334/JKCI.2023.35.4.421 |
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Keywords |
열에너지 저장; 열사이클; 초고성능 콘크리트; 압축강도; 열전도도 thermal energy storage; thermal cycle; ultra-high performance concrete; compressive strength; thermal conductivity |
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Abstract |
This study aimed to explore the utilization of ultra-high performance concrete as a thermal energy storage medium. The ultra-high-performance concrete was fabricated to achieve target compressive strengths of 120 MPa and 180 MPa, with steel fiber contents of 1.0, 1.5, and 2.0 %. respectively. To simulate the day and night cycle and the heat transfer from the sun, a thermal cycle was set up to conduct experiments and evaluate the material properties under repetitive high-temperature exposure. The physical stability of the concrete was analyzed by measuring chasges in unit weight during the thermal cycle. Furthermore, the mechanical properties were assessed before and after the application of the thermal cycle to compare and analyze any performance changes. For ultra-high performance concrete (UHPC) with steel fiber contents of 1.0, 1.5, and 2.0 %, the compressive strength after applying the thermal cycle for the target compressive strength of 180 MPa was measured at 187.3, 188.6, and 193.3 MPa, respectively, indicating excellent results. Considering that thermal properties are very important for a thermal energy storage medium, experiments were conducted and analyzed based on the application of thermal cycles. For UHPC with steel fiber contents of 1.0, 1.5, and 2.0 %, the thermal conductivity of the concrete with a target compressive strength of 180 MPa was found to be 41.7, 39.4, and 43.3 % higher than that of concrete with a target compressive strength of 120 MPa after applying the thermal cycle.
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