Abstract: Concrete is an important material in civil engineering construction. Due to design, construction, service environment and material itself, some non-structural cracks exist in concrete when it is put into use. Engineering practice has found that under long-term dynamic load, concrete cracks will expand and evolve in the length, width and depth directions, and the combined action of dynamic load and environment will accelerate the expansion of cracks, accelerate the deterioration of concrete materials, and lead to concrete mechanics and durability. Lowering seriously affects structural safety. The long-term action of dynamic load will cause complex changes in the stress field and displacement field near the crack tip, which will cause stress concentration and strain energy release. When the crack tip stress intensity factor is greater than the material fracture toughness, the crack will grow instability. The dynamic load will generate dynamic hydraulic pressure on the water in the cracks. Under the action of dynamic hydraulic pressure, the water will repeatedly scour and dissolve the inner walls of the cracks, resulting in the loss of aggregates and hydration products on the inner walls of the cracks and accelerating the crack propagation. In the process of low-temperature freezing and thawing, water repeatedly freezes and dissolves on the inner wall of the crack, resulting in frost heave stress in the crack. The dynamic load causes the volume change of the crack to increase the frost heave stress. At the same time, the freeze-thaw affects the aggregate on the inner wall of the crack. And hydration products produced denudation and accelerated the expansion of concrete cracks. The combined effect of dynamic load-water-freeze-thaw on the propagation and evolution of concrete macroscopic cracks is more complicated, and there is no systematic study yet. This paper summarizes the latest developments in the research on the expansion and evolution of concrete macroscopic cracks under the combined action of dynamic load-water-freeze-thaw, combs the acceleration mechanism of water and freeze-thaw on the crack propagation evolution under dynamic load, and the calculation method of crack propagation and evolution and effective predictive models. The problems that need to be further solved in this research direction are proposed, in order to lay the foundation for further mastering the long-term service performance of concrete structures, perfecting concrete structure damage theory and maintenance technology.
马昆林, 王中志, 龙广成, 谢友均, 曾晓辉. 动荷载-水-冻融共同作用下混凝土宏观裂缝扩展与演变的研究进展[J]. 材料导报, 2021, 35(19): 19091-19098.
MA Kunlin, WANG Zhongzhi, LONG Guangcheng, XIE Youjun, ZENG Xiaohui. Propagation and Evolution of Macroscopic Crack of Concrete Under Dynamic Load-Water-Freeze-Thaw Action: a Review. Materials Reports, 2021, 35(19): 19091-19098.
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