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硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (10): 3405-3413.

• 水泥混凝土 • 上一篇    下一篇

低温环境中新型水泥基材料抗拉性能和微结构的演化行为

张超1, 杨海涛2, 段品佳1, 黄欢1, 刘娟红3   

  1. 1.中海石油气电集团有限责任公司,北京 100028;
    2.石家庄铁道大学土木工程学院,石家庄 050043;
    3.北京科技大学土木与资源工程学院,北京 100083
  • 收稿日期:2021-04-08 修回日期:2021-04-22 出版日期:2021-10-15 发布日期:2021-11-11
  • 通讯作者: 杨海涛,博士,讲师。E-mail:b15313203281@163.com
  • 作者简介:张 超(1985—),男,博士,工程师。主要从事液化天然气存储转运技术与应用研究。E-mail:zhangchao5@cnooc.com.cn
  • 基金资助:
    国家自然科学基金(51834001,51678049)

Evolution Behavior of Tensile Properties and Microstructure of New Cementitious Materials at Cryogenic Temperatures

ZHANG Chao1, YANG Haitao2, DUAN Pinjia1, HUANG Huan1, LIU Juanhong3   

  1. 1. China National Offshore Oil and Gas Group Co., Ltd., Beijing 100028, China;
    2. School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;
    3. College of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2021-04-08 Revised:2021-04-22 Online:2021-10-15 Published:2021-11-11

摘要: 低温环境中混凝土的抗拉性能是影响“全混凝土”液化天然气储罐长期安全服役的重要因素。本文研发了一种新型耐低温高性能水泥基材料(CHC),利用拉伸试验机研究了低温循环(20~-165 ℃)前后CHC的抗拉性能,借助压汞孔隙率测试和核磁共振测试分析了CHC的孔结构特征。结果表明,相比于C60混凝土,CHC的总孔隙率较低,抗拉强度较大,峰后变形能力较强。低温循环后,微裂缝的出现和总孔隙率的增加导致CHC和C60混凝土的峰值应力下降。相比于C60混凝土,CHC中裂缝的宽度较小,总孔隙率的增加量较少,故CHC峰值应力的下降幅度较低。本研究证实低温循环前后CHC的抗拉性能均优于C60混凝土,这源于CHC优异的孔结构和钢纤维的掺入。

关键词: 混凝土, 水泥基材料, 低温, 孔结构, 抗拉性能, 钢纤维

Abstract: The tensile property of concrete at cryogenic temperatures is an important factor affecting the long-term safe service of "all-concrete" liquified natural gas storage tanks. A new type of cryogenic temperature resistant high-performance cementitious materials (CHC) was developed in this paper. The tensile properties of CHC before and after cryogenic temperature cycles (20 ℃ to -165 ℃) were studied using tensile testing machine. The pore structure characteristics of CHC were analyzed with mercury intrusion porosimetry test and nuclear magnetic resonance test. The results show that the total porosity of CHC is lower than that of C60 concrete, while the tensile strength and post-peak deformation ability of CHC are stronger than that of C60 concrete. After cryogenic temperature cycles, the appearance of microcracks and the increase of the total porosity lead to the decrease of the peak stress of CHC and C60 concrete. Moreover, the crack widths and the increase ratio of the total porosity of CHC are both smaller than that of C60 concrete. Thus the decrease of the peak stress of CHC is lower than that of C60 concrete. This study confirms that the tensile properties of CHC before and after cryogenic temperature cycles are both stronger than that of C60 concrete, which is due to the excellent pore structure and the incorporation of steel fibers in CHC.

Key words: concrete, cementitious material, cryogenic temperature, pore structure, tensile property, steel fiber

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