LDHs调控水泥混凝土水化硬化过程及抗氯离子-硫酸盐侵蚀的机理研究

项目名称： LDHs调控水泥混凝土水化硬化过程及抗氯离子-硫酸盐侵蚀的机理研究

项目编号： No.51502272

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 一般工业技术

项目作者： 段平

作者单位： 中国地质大学（武汉）

项目金额： 21万元

中文摘要： 海洋工程混凝土材料一般服役于各种离子侵蚀的多因素环境下，其耐久性问题十分突出。因此，探索抑制混凝土氯离子、硫酸盐侵蚀的多功能改性材料至关重要。本项目旨在开发混凝土改性新材料并揭示其改性机制，为此，拟开展LDHs材料调控水泥水化过程和混凝土抗离子化学侵蚀性能的微观机制研究，探明LDHs 材料固化阴离子的热力学稳定性及其结构重建与热分解机制，利用实验结合计算机模拟技术的手段揭示LDHs材料调控水泥水化硬化过程的微观机理，阐释LDHs材料调控混凝土抗氯离子和硫酸盐化学侵蚀的作用规律与抑制机制。本项目将创新性地从热力学稳定性角度对LDHs材料固化阴离子的可行性进行论证，构建LDHs材料热演变与结构重建机制，从微结构演变与热动力学角度揭示LDHs材料调控水泥水化硬化与混凝土离子侵蚀的微观本质。研究成果将从阴离子交换与吸附的角度解决混凝土抗化学侵蚀的技术瓶颈，为混凝土性能高效调节材料的设计提供新途径。

中文关键词： 混凝土；耐久性；氯离子；渗透性；硫酸盐侵蚀

英文摘要： Served in the marine environment with multiple factors including erosive ions, concrete materials face to more threatens in terms of durability aspects. It is vital to explore multifunctional modified materials for the inhibition of chloride ion corrosion and sulfate attack. This project aims to develop new modified material and reveal its modification mechanism, therefore, mechanism research on controlling cement hydration process and resistance to chloride ion corrosion and sulfate attack by layered double hydroxides (LDHs) is proposed. It is to explore thermodynamic stability of anion immobilization by LDHs and the relationship between structure regeneration and thermal decomposition mechanism, to reveal the mechanism of controlling cement hydration process by LDHs using combination of experiments and computer simulation technology, and to interpretation the influence law and controlling mechanism of resistance to chloride ion corrosion and sulfate attack by LDHs. This project will innovatively demonstrate the feasibility of anion immobilization by LDHs from the perspective of thermodynamics stability, and establish the relationship between thermal evolution and structural regeneration, and uncover the essence on controlling cement hydration process and resistance to chloride ion corrosion and sulfate attack by LDHs from the perspective of microstructure evolution and the thermodynamic. Research results are expected to solve technology bottleneck of chemical erosion resistance of concrete from the perspective of of exchange and adsorption of anion, and to provide new approach for the design of efficient performance modification materials for concrete.

英文关键词： concrete;durability;chloride ion;permeability;sulfate attack