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Degradation behavior and self-healing mechanism of force-Cl- triggered microcapsule/ cementitious composites
Cement and Concrete Composites ( IF 10.8 ) Pub Date : 2025-01-25 , DOI: 10.1016/j.cemconcomp.2025.105951
Yanxuan Ma, Shuaifei Wang, Meiyu Li, Gongbin Wang, Jiatong Liu, Yuhua Gao, Peng Wang, Zhipeng Zhang

The performance of microcapsules in terms of “chloride response” and their electrochemical remediation mechanism is investigated. Electrochemical testing methods are used, i.e., kinetic potential polarization and electrochemical impedance testing. The variation rules of corrosion behavior of self-healing cementitious composites with different contents of microcapsules, both intact and pre-damaged, were investigated in a chloride ion environment. Based on this, the equivalent circuit change model is established. By fitting the parameters of the circuit elements, the change rule of the fitted parameters of the circuit elements is derived. To analyze the internal changes of self-healing cementitious composites in the corrosion process, and to reveal the self-healing mechanism of self-healing cementitious composites on the protective effect of its internal steel reinforcement. It was shown that the corrosion current density could be reduced as low as 0.87 μA/cm2 for the intact samples immersed for 3 days and as low as 1.95 μA/cm2 for damaged samples. The self-healing cementitious composites remained protective of the internal reinforcement after 56 days of immersion; Studies on the electrochemical self-healing mechanism have shown that microcapsules improve corrosion protection based on increasing the electrical resistivity of cementitious composites. The addition of 9 wt% microcapsules provided up to 39.16 % restoration efficiency at 56 days of immersion, and the restoration efficiency increased to up to 55.62 % in response to the combination of cracks and chloride ions. The microcapsules act together through mechanical and chloride ion response to retard the corrosion rate of steel reinforcement inside the self-healing cementitious composite by protecting the reinforcement passivation film.

中文翻译:


力-Cl-触发的微胶囊/水泥基复合材料的降解行为及自修复机制



研究了微胶囊在“氯化物响应”方面的性能及其电化学修复机制。使用电化学测试方法,即动势极化和电化学阻抗测试。研究了在氯离子环境下,不同微胶囊含量(包括完整和预损伤)的自修复胶凝复合材料的腐蚀行为变化规律。在此基础上,建立了等效电路变化模型。通过对电路元件的参数进行拟合,推导出电路元件的拟合参数的变化规律。分析自修复水泥基复合材料在腐蚀过程中的内部变化,揭示自修复水泥基复合材料对其内部钢筋保护作用的自修复机制。结果表明,浸泡 3 天的完整样品的腐蚀电流密度可降低至 0.87 μA/cm2,而受损样品的腐蚀电流密度可降低至 1.95 μA/cm2。自修复水泥基复合材料在浸泡 56 天后仍对内部加固具有保护作用;对电化学自修复机制的研究表明,微胶囊在提高水泥基复合材料电阻率的基础上提高了防腐蚀性能。添加 9 wt% 的微胶囊在浸泡 56 天后提供了高达 39.16% 的修复效率,并且在响应裂纹和氯离子的组合时,修复效率提高到高达 55.62%。 微胶囊通过机械和氯离子响应共同作用,通过保护增强钝化膜来延缓自修复水泥基复合材料内部钢筋的腐蚀速率。
更新日期:2025-01-29
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