滨海混凝土氯离子固化与阻锈剂缓释协同锈蚀抑制机制

The problem of coastal concrete corrosion caused by penetration of chloride ion restricts the development of economy seriously and bring the potential risk. In this project, aiming at the problems of low ion-exchange efficiency of layered double hydroxide (LDH), low mass loading and single loading type of interlaminar corrosion inhibitor, the diatomite@layered double hydroxides was prepared by self-assembly nano-technology. Combined the chloride ion curing and corrosion inhibitor slow-release of diatomite porous structure, the efficient corrosion inhibition for concrete is achieved synergistically. The controllable preparation mechanism of diatomite@layered double hydroxides was explored while guided by theoretical calculation and combined with self-assembly nanotechnology under the control of multiple factors. The law of chloride ion curing and the mechanism of corrosion inhibitors slow-release of diatomite@layered double hydroxides were determined by theoretical calculation and adsorption/desorption experiments. The mechanism and effect of corrosion inhibition and self-repair of diatomite@layered double hydroxides in concrete were studied by nondestructive Nano-CT technology, atomic Force microscope, X-ray electron spectroscopy, high resolution transmission electron microscope and other characterization methods. The implementation of this project can not only provide new ideas and new methods for the coastal concrete anti-corrosion field, but also advanced solutions to the corrosion problem of engineering concrete in extremely harsh environment.

由氯离子侵蚀引起的滨海混凝土锈蚀问题严重制约着经济的发展并带来了安全隐患。本项目针对层状双氢氧化物离子交换效能低、阻锈剂载量少、种类单一等问题，借助自组装纳米技术，设计了硅藻土@层状双氢氧化物复合材料，结合层状双氢氧化物的氯离子固化作用和硅藻土多孔结构的阻锈剂缓释作用，协同实现混凝土的高效锈蚀抑制。本项目以理论计算和表界面物理化学理论为指导，探究硅藻土@层状双氢氧化物的可控制备机理；以理论计算结合吸脱附实验，明确硅藻土@层状双氢氧化物材料的氯离子固化规律及阻锈剂缓释机制；以无损的Nano-CT技术结合原子力显微镜、X光电子能谱、高分辨透射电子显微镜等表征测试手段实现硅藻土@层状双氢氧化物在混凝土内部的腐蚀抑制机理及效果研究。本项目的开展，不仅可以为滨海混凝土防腐领域提供新思路和新方法，也可以为极端恶劣环境下工程用混凝土的锈蚀问题提供先进的解决方案。

2020-2021完成基础实验方案C-S-H合成方法；在硅藻土负载LDH；2021-2022年度完成配比优化，并硅藻土直接碱激发制备泡沫混凝土；2022-2023年主要完成数据处理和成果总结。总之，从选题到项目实施，到总结，系统的开展了研究内容的相关工作。截止目前，已发表高水平学术论文17篇，其中SCI论文16篇，EI综述1篇，申请发明专利1项，硅藻译著1部。围绕本项目成果获得省部级奖励3项，其中包括重庆市自然科学奖一等奖、非金属矿科学技术奖一等奖和二等奖各一项（基础研究类），牵头申报非金属矿学科技术奖技术发明类一项（2022年12月26日答辩，结果未公示）。申请人组织并参与多项国内外重要学术会议，与国内外同行汇报了课题进展，受到普遍的好评和认可。本项目与重庆大学开展联合攻关，联合培养博士研究生2名，硕士生4名（包括重庆工商大学1名）。