冻融循环下灌浆修复裂缝混凝土试件力学特性研究

doi:10.16552/j.cnki.issn1001-1625.2024.1253

摘要/Abstract

摘要： 寒区的混凝土工程经常会受到不同程度的冻融破坏,但目前对破坏修复后的混凝土在冻融环境中再次服役的研究较少。为研究冻融循环对不同材料灌浆修复裂缝混凝土试件力学特性的影响,本文制备裂缝混凝土试件,用普通硅酸盐水泥(OPC)和环氧树脂(ERP)进行灌浆修复,对灌浆修复试件开展冻融循环试验和单轴压缩试验。借助颗粒流程序(PFC)建立不同胶结模式的模型,基于水冰颗粒相变耦合膨胀方法实现混凝土冻融循环模拟,结合室内试验研究不同冻融循环次数下试件力学特性、裂纹扩展和破坏模式的变化规律。试验结果表明:随冻融循环次数增加,灌浆修复试件的表观冻融劣化状态逐渐加重,质量表现为先增大后减小;冻融损伤在冻融后期的发展呈加速状态,ERP修复试件的抗冻性优于OPC修复试件。模拟结果表明:灌浆材料与混凝土之间的胶结性能对浆液-混凝土胶结界面层的冻融劣化程度有较大影响,进而导致试件的抗冻性产生差异;随着冻融循环次数的增加,冻融损伤的累积会使试件的主裂纹扩展路径发生变化,导致试件的破坏模式改变。灌浆材料的强度和胶结性能可以改变试件的受力状态,影响试件的裂纹扩展规律。

关键词: 混凝土, 冻融循环, 灌浆, 修复, 颗粒流程序, 力学特性

Abstract: Concrete engineering in cold regions is often damaged by freeze-thaw in varying degrees, but currently, there is limited research on the re-service of concrete after damage repair in freeze-thaw environments. To study the effect of freeze-thaw cycles on the mechanical properties of cracked concrete specimens with grouting repair by different materials, cracked concrete specimens were prepared and repaired by grouting with ordinary Portland cement (OPC) and epoxy resin polymer (ERP), and freeze-thaw cycle tests and uniaxial compression tests were conducted on the grouting repair specimens. By using particle flow code (PFC) to establish models of different bonding modes, the freeze-thaw cycle simulation of concrete was realized based on the water ice particle phase transition coupled expansion method. By combining with indoor tests, the study explored the variations in mechanical properties, crack propagation, and failure modes of specimens across different freeze-thaw cycles. The test results show that with the increase in the freeze-thaw cycles, the apparent freeze-thaw deterioration state of the grouting repair specimens gradually increase, and the quality increases first and then decreases. The development of freeze-thaw damage accelerates in the later stages of freeze-thaw cycles, and the frost resistance of ERP repaired specimens is better than that of OPC repaired specimens. The simulation results show that the bonding performance between grouting materials and concrete has a significant impact on the degree of freeze-thaw deterioration of the slurry-concrete bonding interface layer, leading to differences in the frost resistance of the specimens. As the number of freeze-thaw cycles increases, the accumulation of freeze-thaw damage will change the main crack propagation path of the specimen, resulting in a change in the failure mode of the specimen. The strength and bonding performance of grouting materials can change the stress state of the specimen and affect its crack propagation law.

Key words: concrete, freeze-thaw cycle, grouting, repair, particle flow code, mechanical property

中图分类号:

TU528

任恩重, 张翔, 董珑慧. 冻融循环下灌浆修复裂缝混凝土试件力学特性研究[J]. 硅酸盐通报, 2025, 44(6): 2135-2148.

REN Enzhong, ZHANG Xiang, DONG Longhui. Mechanical Properties of Cracked Concrete Specimens with Grouting Repair under Freeze-Thaw Cycles[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(6): 2135-2148.

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