基于纳米TiO2改性环氧树脂混凝土涂层的“原位”制备及抗氯离子渗透机理研究

项目名称： 基于纳米TiO2改性环氧树脂混凝土涂层的“原位”制备及抗氯离子渗透机理研究

项目编号： No.51508293

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 建筑环境与结构工程学科

项目作者： 郭思瑶

作者单位： 青岛理工大学

项目金额： 20万元

中文摘要： 环氧树脂防腐涂层可有效的防止海洋环境下氯离子对混凝土结构中钢筋的锈蚀。本项目将纳米氧化物的制备方法—纯有机均相沉积法与环氧树脂的制备过程有机结合，开发出纳米材料在线生成的同时便可与周围树脂分子进行原位聚合的纳米改性环氧树脂新工艺—在线一步原位聚合法，拟制备出抗氯离子侵蚀能力强、耐候性能优异的纳米改性环氧树脂，并通过对这种纳米复合混凝土涂层材料的各项性能的评价，确定纳米改性的最佳工艺条件。另外，综合利用各种测试手段对树脂中纳米粒子的大小、形貌、晶体结构进行分析，探讨涂膜增强增韧机理。通过研究氯离子渗透前后纳米氧化物及混凝土中钢筋表面的电化学及化学价态测试，分析纳米TiO2表面钛醇基与环氧树脂中活性基团的化学作用、纳米材料的价态变化及可逆行为，探讨氯离子与纳米氧化物之间的氧化还原过程，揭示纳米改性环氧树脂的防腐机理，为开发海洋环境中具有优异耐久性的钢筋混凝土环氧涂层材料奠定理论基础。

中文关键词： 耐久性；混凝土损伤；化学性能；物理性能；纤维混凝土

英文摘要： Epoxy resin coating can effectively prevent the chlorine ion corrosion of rebar in concrete under the condition of marine environment. For the preparation of nano modified epoxy resin with enhanced chloride penetration resistance and excellent weather-resistance, this subject develops a novel method of nano-modified epoxy resin—one step in-situ polymerization, via combine the preparation method of nano oxide and epoxy resin, which can produce the nano material on line, and these nano material connect with epoxy resin polymerization simultaneously. The optimum conditions were obtained through the evalution of performance of this concrete coating. Moreover, we also uses various testing methods to analyze the nanoparticle size, morphology, crystal structure, as well as the mechanisms for strength and toughness of the coating. In order to reveal the mechanism of the nano modified epoxy resin, we will test the electrochemical and chemical valence state on the surface of nano oxide and rebar before and after the chloride-induced by electrochemical work station, and also analyze the chemical interaction between the titanium alkoxides groups of titania and the active groups of epoxy resin, as well as the variation of valence states and its reversible reaction, discuss the process of oxidation and reduction between chlorine ion and nano oxide. The work offers a reference and theory foundation for the reinforced concrete protective coating with excellent weather-resistance in marine environment.

英文关键词： Durability;Concrete Damage;Chemical Property;Physical Property;Fiber Concrete