氯盐干湿环境下迁移型阻锈剂对混凝土内钢筋保护作用的宏微观分析  

Macro and micro analysis of the protective effect of migrating corrosion inhibitor on steel reinforcement in concrete under wet and dry environment of chloride salt

作　　者：陆春华[1] 徐奕帆 蔡启明 朱学武 LU Chunhua;XU Yifan;CAI Qiming;ZHU Xuewu(Faculty of Civil Engineering and Mechanics,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学土木工程与力学学院,镇江212013

出　　处：《江苏科技大学学报（自然科学版）》2024年第4期79-85,共7页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金资助项目(51878319)。

摘　　要：为了研究迁移型阻锈剂(MCI)对不同氯盐侵蚀程度下混凝土结构的长期保护作用,通过对钢筋混凝土试验梁在质量浓度为5%的NaCl溶液中进行不同周期的氯盐干湿循环试验,以钢筋表面元素及形貌、钢筋保护效率等参数表征MCI对混凝土梁内钢筋的保护效果.结果表明:①对氯盐侵蚀引起的钢筋锈蚀,当MCI用量为400 g/m^(2)时,能为不同阶段、不同锈蚀程度的钢筋提供有效的保护作用.②氯盐干湿环境下,随着初始氯离子含量由0上升到0.169%,MCI的阻锈效率也由98.39%下降至83.12%,故应当先除氯再使用MCI,以保证效率最大化;③阻锈剂可以有效修复钢筋表面钝化膜上的裂缝,并提高混凝土致密度,阻塞有害离子(如Cl^(-))的渗入从而抑制或延缓钢筋锈蚀的发生.上述研究工作可为MCI在沿海混凝土工程中的应用提供依据.In order to investigate the long-term protective effect of migrating corrosion inhibitor(MCI)on concrete structures suffering from different degrees of chloride salt corrosion,in this study,reinforced concrete beams were exposed to NaCl solution(5%by mass)wet and dry cycles for different periods,and the protective effect of MCI on reinforcements in concrete beams was characterized in terms of bar’s surface elements,morphology and protection efficiency.The results show that:①For the corrosion of steel reinforcement caused by chloride salt corrosion,when the dosage of MCI is 400 g/m^(2),it can provide effective protection for steel reinforcement at different stages and corrosion degrees.②Under the dry and wet environment of chloride salt,with the initial chlorine ion content increasing from 0 to 0.169%,the corrosion inhibition efficiency of MCI decreases from 98.39% to 83.12%,and thus chloride ions should be removed before using MCI to ensure the best possible efficiency.③The corrosion inhibitor can effectively repair the cracks on the passivation film of the reinforcement surface and improves the density of the concrete,blocking the infiltration of harmful ions(such as Cl^(-))to inhibit or delay the occurrence of reinforcement corrosion.Our research can provide a basis for the application of MCI in coastal concrete projects.

关 键 词：氯盐干湿循环 钢筋锈蚀 迁移型阻锈剂 保护效率 微观分析 

分 类 号：TU375.1[建筑科学—结构工程]