Thermal Properties of High-strength Concrete with Laser Flash Analysis at Cryogenic Temperatures
YANG Haitao1,2,3, DUAN Pinjia4, WU Ruidong1,2,3, LIU Juanhong1,2,3, LOU Baichuan1,2,3, LUO Kun1,2,3
1 College of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2 Beijing Key Laboratory of Urban Underground Space Engineering, University of Science and Technology Beijing, Beijing 100083, China; 3 State Key Laboratory of High-efficient Mining and Safety of Metal Mines, Ministry of Education, University of Science and Technology Beijing, Beijing 100083, China; 4 China National Offshore Oil and Gas Group Co., Ltd., Beijing 100028, China
Abstract: The thermal properties are key factors affecting the safety and operating efficiency of all-concrete LNG storage tank. However, the thermal properties of concrete at cryogenic temperatures are still unclear. The performance of a new type of cryogenic temperature resistant high-performance concrete (CHC) was evaluated in this paper. The pore structure, heat flow behavior, mechanical and thermal properties of CHC at cryo-genic temperatures were investigated. The results showed that the volume of capillary pores and air pores and the total porosity of CHC matrix were less than that of C60 concrete. At cryogenic temperatures, the heat flow curve of CHC matrix reached its peak at -36 ℃. The height of heat flow peak, specific heat capacity, thermal diffusivity, and thermal conductivity of CHC matrix were less than that of C60 concrete. When the temperature decreased from 25 ℃ to -90 ℃, the peak stress value, elastic modulus, and thermal diffusion coefficient of CHC matrix and C60 concrete increased; while the specific heat capacity and thermal conductivity decreased. The mechanical properties of CHC and the thermal properties of CHC matrix are superior to C60 concrete at cryogenic temperature.
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2020, Vol. 34 
