混凝土在冻融循环和 CT 细观损伤下的动态特性研究

IF 1.2 4区工程技术 Q3 ACOUSTICS

Shock and Vibration Pub Date : 2023-12-28 DOI:10.1155/2023/6357286

Liangting Wang, Zhishan Zheng, Zheng Xiahou, Xijian Chao, Ming Xia

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引用次数: 0

摘要

为了研究冻融循环下混凝土的动态力学性能，使用直径为 50 mm 的分体式霍普金森压力棒（SHPB）试验装置，在 0.4 MPa 的冲击气压下，对不同冻融循环次数（0、25、50、75 和 100）的混凝土试件进行了单轴冲击压缩试验，并结合 CT 扫描系统分析了冻融循环前后混凝土试件的内部裂缝。结果显示如下。(1）混凝土试件在冻融循环下分为线弹性阶段、塑性阶段和损伤阶段，试件的宏观力学参数随冻融循环次数的增加而减弱。(2）冻融加剧了试件内部断裂的扩展和渗透，CT 扫描结果表明，混凝土试件内部断裂参数随冻融循环次数的增加而增加，内部断裂的结构特征逐渐呈现出复杂的扩展和演变特征。(3）从细观层面界定了破坏程度，破坏程度随冻融循环次数的增加而增加，建立了冻融循环下混凝土试件细观劣化与宏观参数损失之间的内在联系。该结果对进一步阐明冻融条件下混凝土材料损伤的内部结构特征，揭示损伤劣化机理具有重要意义。

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Study on the Dynamic Properties of Concrete under Freeze-Thaw Cycles and CT Fine View Damage

In order to study the dynamic mechanical properties of concrete under freeze-thaw cycles, uniaxial impact compression tests were conducted on concrete specimens with different number of freeze-thaw cycles (0, 25, 50, 75, and 100) using a 50 mm diameter split Hopkinson pressure bar (SHPB) test device at an impact air pressure of 0.4 MPa and combined with a CT scanning system to analyze the internal fissures of concrete specimens before and after freeze-thaw cycles. The results showed the following. (1) The concrete specimens were divided into linear elastic stage, plastic stage, and damage stage under the freeze-thaw cycle, and the macroscopic mechanical parameters of the specimens were weakened with the increase of the number of freeze-thaw cycles. (2) Freeze-thaw intensified the expansion and penetration of the internal fracture of the specimens, and the CT scan results showed that the internal fracture parameters of the concrete specimens were increased with the increase of the number of freeze-thaw cycles, and the structural characteristics of the internal fracture show gradually complex expansion and evolution characteristics. (3) The degree of damage was defined at the fine level, which increased with the number of freeze-thaw cycles, establishing an intrinsic link between the fine deterioration of concrete specimens and the loss of macroscopic parameters under freeze-thaw cycles. The results are of great significance to further elucidate the internal structural characteristics of concrete material damage under freeze-thaw conditions and to reveal the damage deterioration mechanism.

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来源期刊

Shock and Vibration 物理-工程：机械

CiteScore

3.40

自引率

6.20%

发文量

384

审稿时长

3 months

期刊介绍： Shock and Vibration publishes papers on all aspects of shock and vibration, especially in relation to civil, mechanical and aerospace engineering applications, as well as transport, materials and geoscience. Papers may be theoretical or experimental, and either fundamental or highly applied.