Enhanced performance of high temperature aluminate cementitious materials incorporated with Cu powders for thermal energy storage |
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| Affiliation: | 1. Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, YunNan, KunMing 650504, PR China;2. Faculty of Metallurgical and Energy, Kunming University of Science and Technology, YunNan, KunMing 650093, PR China;3. Institute of Chemical Physics, Beijing Institute of Technology, Beijing 100081, PR China;1. Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, PR China;2. Key Laboratory of Luminescence and Optical Information of Ministry of Education, Institute of Optoelectronics Technology, Beijing Jiaotong University, Beijing 100044, PR China |
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| Abstract: | Cementitious materials have been extensively developed in thermal energy storage system of solar thermal power. This paper deals with the volume heat capacity, thermal conductivity, thermal expansion coefficient, and compressive strength of aluminate cementitious thermal energy storage materials with the addition of metal Cu powders. The specimens were subjected to heat-treatment at 105, 350, and 900 °C, respectively. In the heating process, Cu powders gradually oxidized to Cu2O and CuO, providing a so-called mass compensation mechanism for the composite paste. Meanwhile, it indicates that volume heat capacity and thermal conductivity both increase with increasing Cu powders content and decrease with the rising temperature. The optimum thermal properties were obtained at 15 wt% Cu powders loading. In addition, Calorimetric Test, XRD, TG–DSC, and MIP are performed for characterizing the hydration rates, the phases, the mass/heat evolution, and the pore distribution, respectively. |
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| Keywords: | Cementitious material Thermal energy storage Cu powders Properties |
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