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Effect of thermal treatment on physical and mechanical properties of sandstone for thermal energy storage: a comprehensive experimental study
https://orcid.org/http://orcid.org/0000-0002-0975-1201
Natural rock is considered a solution for thermal energy storage (TES). comprehensive understanding of the effect of high temperature on the physical and mechanical properties of rock has an important effect on the carbon footprint. The novelties of this paper are as follows. First, the influence of high temperature on the distribution characteristics of sandstone pores is studied by defining four kinds of pores. Next, the spatial evolution of cross-scale pores is revealed. Then the average pore radius that can quantitatively represent the overall pore distribution is proposed. Finally, the influence of thermal treatment on the characteristic stress of sandstone is analyzed. An abnormal change in compactness and mechanical parameters is observed at 450 °C, and a reasonable explanation is provided. The results show that the most of physical and mechanical parameters have significant critical temperatures. In the range of 150–450 °C, the trend in small-scale pores, porosity, and average pore radius initially increases and then decreases. The mechanical parameters reach a maximum at 300 °C, and the mineral composition changes dramatically from 600 to 900 °C. The large-scale pores, porosity, and average pore radius increase, and the mechanical properties are weakened. These results are of great importance for the stability of the surrounding rock under high-temperature environments (industrial waste heat, nuclear waste disposal, and tunnel fires).
Effect of thermal treatment on physical and mechanical properties of sandstone for thermal energy storage: a comprehensive experimental study
https://orcid.org/http://orcid.org/0000-0002-0975-1201
Natural rock is considered a solution for thermal energy storage (TES). comprehensive understanding of the effect of high temperature on the physical and mechanical properties of rock has an important effect on the carbon footprint. The novelties of this paper are as follows. First, the influence of high temperature on the distribution characteristics of sandstone pores is studied by defining four kinds of pores. Next, the spatial evolution of cross-scale pores is revealed. Then the average pore radius that can quantitatively represent the overall pore distribution is proposed. Finally, the influence of thermal treatment on the characteristic stress of sandstone is analyzed. An abnormal change in compactness and mechanical parameters is observed at 450 °C, and a reasonable explanation is provided. The results show that the most of physical and mechanical parameters have significant critical temperatures. In the range of 150–450 °C, the trend in small-scale pores, porosity, and average pore radius initially increases and then decreases. The mechanical parameters reach a maximum at 300 °C, and the mineral composition changes dramatically from 600 to 900 °C. The large-scale pores, porosity, and average pore radius increase, and the mechanical properties are weakened. These results are of great importance for the stability of the surrounding rock under high-temperature environments (industrial waste heat, nuclear waste disposal, and tunnel fires).
Effect of thermal treatment on physical and mechanical properties of sandstone for thermal energy storage: a comprehensive experimental study
https://orcid.org/http://orcid.org/0000-0002-0975-1201
Natural rock is considered a solution for thermal energy storage (TES). comprehensive understanding of the effect of high temperature on the physical and mechanical properties of rock has an important effect on the carbon footprint. The novelties of this paper are as follows. First, the influence of high temperature on the distribution characteristics of sandstone pores is studied by defining four kinds of pores. Next, the spatial evolution of cross-scale pores is revealed. Then the average pore radius that can quantitatively represent the overall pore distribution is proposed. Finally, the influence of thermal treatment on the characteristic stress of sandstone is analyzed. An abnormal change in compactness and mechanical parameters is observed at 450 °C, and a reasonable explanation is provided. The results show that the most of physical and mechanical parameters have significant critical temperatures. In the range of 150–450 °C, the trend in small-scale pores, porosity, and average pore radius initially increases and then decreases. The mechanical parameters reach a maximum at 300 °C, and the mineral composition changes dramatically from 600 to 900 °C. The large-scale pores, porosity, and average pore radius increase, and the mechanical properties are weakened. These results are of great importance for the stability of the surrounding rock under high-temperature environments (industrial waste heat, nuclear waste disposal, and tunnel fires).
Effect of thermal treatment on physical and mechanical properties of sandstone for thermal energy storage: a comprehensive experimental study
Acta Geotech.
Hao, Jiawang (author) / Qiao, Lan (author) / Liu, Zhiyi (author) / Li, Qingwen (author)
Acta Geotechnica ; 17 ; 3887-3908
2022-09-01
22 pages
Article (Journal)
Electronic Resource
English
Characteristics stress , High temperature rock mechanics , Mechanical behavior , Physical property , Pores distribution , Thermal energy storage Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
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