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

Abstract

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

CLC Number:

TU528

ZHANG Chao, YANG Haitao, DUAN Pinjia, HUANG Huan, LIU Juanhong. Evolution Behavior of Tensile Properties and Microstructure of New Cementitious Materials at Cryogenic Temperatures[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(10): 3405-3413.

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