Chemical Self-healing Microcapsule for Cementitious System
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摘要: 为了利用微胶囊技术初步实现钢筋混凝土的智能感知和自我修复能力, 延长结构的服役寿命, 从材料智能化着手, 结合微胶囊技术和钢筋缓释剂知识, 设计了一套针对水泥基复合材料的化学自修复微胶囊系统.此系统的核心内容是智能释放行为和可控阻锈机制, 同时建立了智能释放和可控阻锈的评估体系.在水分析化学方法中乙二胺四乙酸 (ethylene diamine tetraacetic acid, EDTA) 滴定法的基础上进行改进, 用来测试微胶囊在不同pH、不同时间和不同囊壁厚度条件下的释放行为, 探索智能释放规律;运用交流阻抗谱的方法来评估微胶囊阻锈效果, 同时以宏观钢筋锈蚀图像对比为佐证.此外, 在交流阻抗谱的基础上, 建立了一个全新的电化学模型, 解释化学自修复微胶囊的阻锈性能.Abstract: To fulfil initially the intellisense and self-healing of concrete for corrosion of reinforcement by means of microcapsule technology, a novel chemical self-healing system based microcapsule technology was designed for cementitious composites, which was accompanied by a chemical trigger mechanism. The fundamental issue of this system was the smart releasing performance in cementitious environment and controlled rebar protection effectiveness against corrosion. The measurements with ethylene diamine tetraacetic acid （EDTA) titration and electrochemical impedance spectroscopy （EIS) method were applied to achieve above targets.Resultsshow that properties of microcapsule are affected by the time, the shell thickness of microcapsule and the pH-values in cementitious environment. Besides, an electrochemical model is built up to explain the anti-corrosion pattern of this microcapsule based selfhealing system.
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[1] 邢锋.混凝土结构耐久性设计与应用[M].北京:中国建筑工业出版社, 2011:1-10. [2] CADY P D, WEYERS R E.Chloride penetration and the deterioration of concrete bridge decks[J].Cement Concrete and Aggregates, 1983, 5 (2) :81-87.
[3] MARSAVING L, AUDENAERT K, De SCHUTTER G, et al.Experimental and numerical determination of the chloride penetration in cracked concrete[J].Construction and Building Materials, 2009, 23 (1) :264-274.
[4] 许时婴, 张晓明.微胶囊技术——原理与应用[M].北京:化学工业出版社, 2006:200-221. [5] TITTELBOOM K V, GRUYAERT E, RAHIER H, et al.Influence of mix composition on the extent of autogenous crack healing by continued hydration or calcium carbonate formation[J].Construction and Building Materials, 2012, 37:349-359.
[6] SISOMPHON K, COPUROGLU O, KOENDERS E A B.Self-healing of surface cracks in mortars with expansive additive and crystalline additive[J].Cement&Concrete Composites, 2012, 34 (4) :566-574.
[7] La IGLESIA A, La IGLESIA V M, FAJARDO S, et al.Reaction between sodium monofluorophosphate and portlandite and impact on steel reinforcement corrosion inhibition[J].Construction and Building Materials, 2012, 37:46-50.
[8] RULE J D, SOTTOS N R, WHITE S R.Effect of microcapsule size on the performance of self-healing polymers[J].Polymer, 2007, 48 (12) :3520-3529.
[9] 史美伦.交流阻抗谱原理及应用[M].北京:国防工业出版社, 2001:22-60. [10] OSKUIE A A, SHAHRIARI T, SHAHRIARI A, et al.Electrochemical impedance spectroscopy analysis of X70pipeline steel stress corrosion cracking in high pH carbonate solution[J].Corrosion Science, 2012, 61:111-122.
[11] GU Kun-ming, LYU Le-yang, LU Zhao-long, et al.Electrochemical corrosion and impedance study of SAE1045 steel under gel-like environment[J].Corrosion Science, 2013, 74:408-413.
[12] DONG Bi-qin, WANG Yan-shuai, DING Wei-jian, et al.Electrochemical impedance study on steel corrosion in the simulated concrete system with a novel self-healing microcapsule[J].Construction and Building Materials, 2014, 56:1-6.
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