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极端温度环境对混凝土服役性能与结构安全具有负面影响，其劣化过程涉及诸多复杂物理化学作用。本文概述了混凝土在超低温环境下的宏观力学性能及微结构特征演变，阐释了超低温作用下混凝土的性能增强机制，归纳了低温冻融循环后混凝土性能劣化机制，探讨了目前极端低温环境下混凝土研究存在的关键问题，并对未来相关研究进行了展望。
Abstract：As one of the frontier domains of modern materials research, extreme cryogenic environments often expose materials with intrinsic properties that are completely different from those at ambient temperature. The existing concrete engineering in extreme cryogenic environments is ubiquitous, such as railway in northern or plateau cold regions of China(–40 ℃), cryogenic refrigeration warehouses(–80 ℃), the construction of the North and South Poles(–94.5 ℃), liquefied natural gas storage tanks(–161.5 ℃), liquid nitrogen storage tank(–196 ℃), liquefied hydrogen storage tank(–253 ℃), liquid helium storage tank(–268.9 ℃), etc.. In addition, the construction of future lunar bases has attracted recent attention and been put on the agenda by major aerospace countries, and the lunar concrete used for its construction will be subjected to long-term cryogenic temperatures as low as –183 ℃. Concrete is widely applied in structural engineering at ambient temperature due to its superior performance. Therefore, conducting a research on the synergistic mechanism between the macroscopic mechanical behavior and microstructure evolution of concrete under extreme temperature environments has a practical engineering application value for developing new concrete materials that can meet the requirements of extreme temperature service. Extreme cryogenic environments have a negative impact on the service performance and structural safety of concrete, and their deterioration process involves many complex physical and chemical reactions. In this review, the cryogenic concrete application and various methods to improve their cryogenic temperature resistance were systematically introduced. The macroscopic mechanical properties of concrete in cryogenic environments, such as compressive strength, tensile strength, flexural strength, bonding strength, and elastic modulus evolution, were elaborated in detail. The evolution of microstructure characteristics of concrete under cryogenic freeze-thaw cycles was summarized, i.e., pore water phase transition, interface transition zone destruction, and C-S-H gel degradation. From the point of view of the strength increase of C-S-H gel at cryogenic temperature and the enhancement of pore water icing, the enhancing mechanism of concrete performance at cryogenic temperature was summarized. Based on the hydrostatic pressure theory, osmotic pressure theory, crystallization pressure theory, micro-ice lens theory, glue spall theory, and unsaturated poroelasticity theory, the mechanism of concrete performance degradation after cryogenic freeze-thaw cycles was discussed. Finally, some key issues on concrete performance in extreme cryogenic environments were analyzed, and the research prospects in the future were proposed. Summary and prospects As one of the most extreme environments, the cryogenic temperature can make materials expose extremely complex and unpredictable potential intrinsic properties. Conducting the relevant research is to reveal the unknown attributes of materials in extreme environments, and to explore their potential applications in the future. This becomes a frontier topic and breakthrough point of scientific barriers in materials science research. The main conclusions are as follows: 1) In cryogenic environments, the mechanical properties of ordinary concrete can deteriorate. Therefore, the cryogenic temperature resistance of concrete structures can be greatly improved via increasing the ratio of stirrups, using prestressed steel bars, adding fibers, and filling high-strength steel pipes with UHPC. 2) The concrete strength is mainly related to its strength grade, temperature, water content, and porosity. As the temperature decreases, the compressive strength, flexural strength, and tensile strength of concrete firstly increase and then decrease, while the bonding strength shows a linear increasing trend. The critical temperature corresponding to the mechanical failure limit of concrete is different. 3) After cryogenic freeze-thaw cycles, the freezing, freeze-thaw and migration of pore water in concrete can destroy the pore structure. The uncoordinated thermal deformation, loose aggregate structure and high water absorption induce cracking in concrete interface transition zone. The C-S-H gel can undergo depolymerization fracture or interlayer ion bonding recombination, leading to interlayer pore collapse and shrinkage cracking. 4) At cryogenic temperature, the strength increase of C-S-H gel and the phase transition of pore water are the internal factors that enhance the concrete performance. During the cold freeze-thaw cycle, based on the volume expansion caused by pore water freezing and its thermodynamic process, the theories of hydrostatic pressure, osmotic pressure, crystallization pressure, micro-ice lens, glue spall and unsaturated poroelasticity are proposed. Although the relevant theories can explain a freeze-thaw failure at low temperatures, they are not fully applicable to explain the failure mechanism of concrete in cryogenic environments. The existing research are conducted in the related fields, but the preliminary conclusions are only drawn on the macroscopic properties, microstructure, and failure mechanism of concrete. However, the research and application of concrete materials in extreme environments involve multiple levels of physical and chemical reactions, coupled with a superposition effect of multiple external factors, which presents complex and variable characteristics. This has certain technical limitations for human-being to utilize the existing cognition to adapt or modify nature. There are still some key issues that need to be solved in this field, i.e., 1) For ordinary concrete, its extreme temperature-variation resistance is inferior due to the limitation of material properties, and the optimization technology and improvement effect are not effective. Therefore, there is an urgent need to develop new concrete materials with an excellent resistance to cryogenic temperatures and long-term service, and deeply analyze their performance evolution and enhancement mechanism in extreme environments. 2) The existing research on cryogenic concrete mainly focuses on macroscopic mechanical and thermal properties, while there is little research on the in-situ evolution of concrete microstructure characteristics at cryogenic temperatures. Meanwhile, the relevant failure theory is only proposed for ordinary freeze-thaw cycles in a small temperature range, and is not applicable to the deterioration mechanism of concrete in complex and extreme cryogenic environments. 3) From the perspective of technical methods, the temperature-variation effect in cryogenic environments has great challenges to the performance testing of concrete and how to coordinate its thermal coupling effect. Simultaneously, it is particularly momentous to achieve in-situ monitoring of concrete performance in extreme environments. That is because many conventional testing equipment, techniques, and methods for macroscopic or microscopic properties of concrete will no longer be applicable. 4) In cryogenic environments, the macroscopic properties and microstructure of concrete exhibit enhancement and degradation effects, and these effects show different dominant trends in different temperature ranges. It is thus necessary for further research to make clear the dominant effects of the reinforcement or deterioration behavior of cryogenic concrete in different temperature ranges and the internal causes of temperature-performance transition.
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基本信息:
DOI：10.14062/j.issn.0454-5648.20230659
中图分类号:TU528
引用信息:
[1]何倍,杨振东,扬帆等.极端低温环境下混凝土力学性能及其演变机制研究进展[J].硅酸盐学报,2024,52(05):1698-1709.DOI:10.14062/j.issn.0454-5648.20230659.
基金信息:
国家自然科学基金资助项目(U22B2076,51878480,52078369,52108241); 2021年产业技术基础公共服务平台(2021-H029-1-1); 上海市优秀学术带头人计划资助(22XD1403300); 中央高校基本科研业务费专项资金资助