Study on the Mechanical Properties and Constitutive Relations of Concrete Under Cryogenic Circumstance
DUAN Pinjia1, BI Xiaoxing1, LI Yuhang1, LIU Juanhong2,3,4,*, ZHOU Dawei2, CHENG Linian2, LOU Baichuan2
1 CNOOC Gas & Power Group Ltd., Beijing 100028, China 2 School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China 3 Beijing Key Laboratory of Urban Underground Space Engineering, University of Science and Technology Beijing, Beijing 100083, China 4 Key Laboratory of the Ministry of Metal Mining and Safety Education, University of Science and Technology Beijing, Beijing 100083, China
Abstract: To solve the problem of cryogenic circumstance (-165 ℃) faced by all-concrete liquefied natural gas(LNG) storage tanks during service, a low-temperature resistant and high-strength concrete (LHC) was formulated. The compressive strength change laws of LHC and ordinary C60 concretes were obtained through the uniaxial and triaxial compression tests under different low temperature conditions. A two-parameter constitutive model was adopted to characterize the deformation characteristics of LHC and C60 concrete under the combined effect of stress and temperature. The test results show that the strength gradually increases as the temperature decreases in the uniaxial test, and the strength of LHC increases from 65.3 MPa (20 ℃) to 96.2 MPa (-165 ℃); the strength of ordinary C60 concrete increases first and then decreases, reaching the maximum value of 78.1 MPa at -140 ℃; the ductility values of LHC and C60 both fluctuate and decrease with the drop of temperature. Under triaxial stress, the strength and ductility of LHC and C60 increase with the drop of temperature. Under the two sets of test conditions, LHC has better cryogenic mechanical properties than ordinary C60 concrete. The research results of this study can provide reference for the application of LHC in all-concrete LNG storage tanks.
段品佳, 毕晓星, 李宇航, 刘娟红, 周大卫, 程立年, 娄百川. 混凝土超低温力学特性及本构关系研究[J]. 材料导报, 2022, 36(18): 21010199-5.
DUAN Pinjia, BI Xiaoxing, LI Yuhang, LIU Juanhong, ZHOU Dawei, CHENG Linian, LOU Baichuan. Study on the Mechanical Properties and Constitutive Relations of Concrete Under Cryogenic Circumstance. Materials Reports, 2022, 36(18): 21010199-5.
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2022, Vol. 36 
