混凝土中阻锈剂的损耗机制及长效性预测

Inhibitor was the most frequently-adopted technique for corrosion inhibition, of which long-term efficiency was the crucial parameter for promotion of structure's durability. Exchange of water and gas inside and outside concrete will lead to dissipation of inhibitor and degradation of its long-term efficiency. In this program, the three key decisive points for long-term efficiency will be studied. Firstly，correlation between inhibition efficiency and concentration of inhibitor and chloride ion will be proposed. So that the efficitive concentration of inhibitor could be calculated. Secondly， by numerical calculation and finit element modelling, dissipation mechanism of inhibitor will be analysed and predication model on dissipation in different enviroment will be developed. Lastly，chloride ion transportation modle will be compared and modified to predict concentration of chloride ion in concrete and the long-term effect of organic inhibitor could be estimated thereby. Based on this study, the necessary mixing amount of inhibitor might be back calculated if the designed life of structure, inhibition property of inhibitor and the service condition could be determined.Therefore, it will be instructive for the scientific application of organic inhibitor in concrete structures.

阻锈剂是钢筋混凝土结构防腐应用最为广泛的技术措施，"长效性"是决定阻锈剂对结构耐久性提升效果的根本。结构中的阻锈剂会因混凝土内外水分、气相的交换而损耗，导致其"长效性"劣化。本项目紧扣决定阻锈剂"长效性"的三个关键问题进行研究，通过腐蚀试验建立阻锈剂阻锈效率与其自身浓度及氯离子浓度的动态关系，实现阻锈剂有效浓度的判定；通过数值计算与有限元模拟，对混凝土不同深度处阻锈剂的损耗机制进行解析，建立不同环境条件下阻锈剂的耗散模型；优选混凝土中氯离子传输模型，基于本研究中混凝土结构参数对模型进行修正；最终实现钢筋混凝土中阻锈剂长效性的预测。基于本研究，还可依据结构设计寿命、阻锈剂性能特点以及服役环境特点反推建构建造初期所需阻锈剂的掺量，对于指导有机阻锈剂的科学应用具有重要意义。

长效性”是决定阻锈剂对结构耐久性提升效果的根本，结构中阻锈剂因混凝土内外水分、气相的交换而损耗，导致其“长效性”劣化。本课题进行了系统的有机阻锈剂构效关系研究，明确了阻锈剂及氯离子浓度与钢筋腐蚀行为关系；通过电位滴定、化学分析以及有机N含量分析等手段，系统研究了不同结构有机阻锈分子在混凝土中的耗散行为，并建立相应模型；结合阻锈剂提升钢筋腐蚀临界氯离子值及阻锈剂耗散模型，在现有寿命预测模型基础上提出了更加科学的阻锈剂应用模型，对于指导有机阻锈剂的科学应用具有重要意义。