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用于修复斜裂缝的复合改性环氧树脂灌封胶性能研究

Study on the Performance of Composite-Modified Epoxy Resin Potting Adhesive for Repairing Oblique Cracks.

作者信息

Chen Zimin, Li Zhengyi, Ran Zhihong, Zhang Yan, Lin Fan, Zhou Yu

机构信息

School of Architecture and Planning, Yunnan University, Kunming 650500, China.

出版信息

Materials (Basel). 2025 Jul 7;18(13):3197. doi: 10.3390/ma18133197.

DOI:10.3390/ma18133197
PMID:40649685
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12250912/
Abstract

Reinforced concrete structures are prone to the development of microcracks during service. In this study, a composite-modified epoxy potting adhesive was formulated using nano-TiO, carboxyl-terminated butadiene nitrile liquid rubber (CTBN), and the reactive diluent D-669. The mechanical properties and effectiveness of this composite adhesive in repairing oblique cracks were systematically evaluated and compared with those of single-component-modified epoxy adhesives. Key material parameters influencing the performance of oblique crack repair were identified, and the underlying repair mechanisms were analyzed. Based on these findings, a theoretical formula for calculating the shear-bearing capacity of beams with repaired web reinforcement was proposed. Experimental results demonstrated that compared to single-component-modified epoxy resin, the optimally formulated composite adhesive improved the tensile strength, elongation at break, and bond strength by 4.07-21.16 MPa, 13.28-20.4%, and 1.05-3.79 MPa, respectively, while reducing the viscosity by 48-872 mPa·s. The viscosity of the adhesive was found to play a critical role in determining the repair effectiveness, with toughness enhancing the crack resistance and bond strength contributing to the structural stiffness recovery. The adhesive effectively penetrated the steel-concrete interface, forming a continuous bonding layer that improved energy dissipation and significantly enhanced the load-bearing capacity of the repaired beams.

摘要

钢筋混凝土结构在使用过程中容易产生微裂缝。在本研究中，使用纳米TiO、羧基封端丁腈液体橡胶（CTBN）和活性稀释剂D - 669配制了一种复合改性环氧灌封胶。系统评估了这种复合胶粘剂修复斜裂缝的力学性能和有效性，并与单组分改性环氧胶粘剂进行了比较。确定了影响斜裂缝修复性能的关键材料参数，并分析了其潜在的修复机理。基于这些发现，提出了计算修复腹板配筋梁抗剪承载力的理论公式。实验结果表明，与单组分改性环氧树脂相比，优化配方的复合胶粘剂的拉伸强度、断裂伸长率和粘结强度分别提高了4.07 - 21.16MPa、13.28 - 20.4%和1.05 - 3.79MPa，同时粘度降低了48 - 872mPa·s。发现胶粘剂的粘度在决定修复效果方面起着关键作用，韧性增强了抗裂性，粘结强度有助于结构刚度恢复。该胶粘剂有效地渗透到钢 - 混凝土界面，形成连续的粘结层，改善了能量耗散，显著提高了修复梁的承载能力。

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考虑时间变化的环氧树脂化学灌浆材料流变行为及表面性质研究
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