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材料导报  2021, Vol. 35 Issue (z2): 183-187    
  无机非金属及其复合材料 |
超低温及低温循环对混凝土材料性能的影响
李凯雯1, 刘娟红1,2, 张超3, 段品佳3, 张博超3
1 北京科技大学土木与资源工程学院,北京 100083
2 北京科技大学城市地下空间工程北京市重点实验室,北京 100083
3 中海石油气电集团有限责任公司,北京 100028
Influence of Ultra-low Temperature and Low Temperature Cycles on Performance of Concrete Materials
LI Kaiwen1, LIU Juanhong1,2, ZHANG Chao3, DUAN Pinjia3, ZHANG Bochao3
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 China National Offshore Petroleum Gas and Electricity Group Co., Ltd., Beijing 100028, China
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摘要 针对普通预应力混凝土作为液化天然气(LNG)储罐材料在超低温(-165 ℃)环境中力学性能显著退化的问题,本文研究并评价了低温高性能混凝土(LHC)的低温性能,并对其孔结构特征和低温循环后的力学性能进行分析。结果表明:LHC基体内部105~104 nm的毛细孔数量相对较少,LHC内毛细孔和气孔的体积以及总孔隙率均低于C60混凝土。低温循环后,LHC基体和C60混凝土内部结构发生一定程度的损伤,各种力学参数均呈下降趋势。与C60混凝土相比,在超低温环境中,LHC具有优异的力学性能。
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李凯雯
刘娟红
张超
段品佳
张博超
关键词:  混凝土  超低温  低温循环  孔结构  力学性能    
Abstract: The mechanical performance of prestressed concrete (LHC) as a material for liquefied natural gas (LNG) storage tanks is significantly degraded in the ultra-low temperature (-165 ℃) environment. The perdormance of low-temperature concrete was studied and evaluated in this paper, and the pore structure characteristics and mechanical properties of LHC after low-emperature cycles are analyzed. The results showed that the number of pores at 105 nm—104 nm in LHC matrix is relatively small, and the volume of pores, pores and total porosity in LHC are lower than those in C60 concrete. After cryogenic cycling, the LHC matrix and the internal structure of C60 concrete were damaged to a certain extent, and all the mechanical parameters showed a downward trend. Compared with C60 concrete, LHC has excellent mechanical performance at ultra-low temperature environment.
Key words:  concrete    ultra-low temperature    low temperature cycles    pore structure    mechanical performance
                    发布日期:  2021-12-09
ZTFLH:  TU528  
基金资助: 中央高校基本科研业务费深地岩体工程材料及其服役安全(FRF-BD-20-01B)
通讯作者:  juanhong1966@ hotmail.com   
作者简介:  李凯雯,北京科技大学土木与资源工程学院硕士研究生,主要研究领域为生态环保型高性能土木工程结构材料。
刘娟红,北京科技大学,教授。主要研究领域包括生态环保型高性能土木工程结构材料、新型 混凝土材料及其环境行为与建筑物寿命分析和矿山充填用新型胶凝材料研究与应用。
引用本文:    
李凯雯, 刘娟红, 张超, 段品佳, 张博超. 超低温及低温循环对混凝土材料性能的影响[J]. 材料导报, 2021, 35(z2): 183-187.
LI Kaiwen, LIU Juanhong, ZHANG Chao, DUAN Pinjia, ZHANG Bochao. Influence of Ultra-low Temperature and Low Temperature Cycles on Performance of Concrete Materials. Materials Reports, 2021, 35(z2): 183-187.
链接本文:  
http://www.mater-rep.com/CN/  或          http://www.mater-rep.com/CN/Y2021/V35/Iz2/183
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