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RESEARCH ON PREVENTING REINFORCING BAR CORROSION IN CONCRETE STRUCTURES CAUSED BY CHLORIDES IN SEA SAND

防止海砂氯化物引起混凝土结构钢筋腐蚀的研究

基本信息

批准号：
02555124
负责人：
TOMOSAWA Fuminori
金额：
$ 10.88万
依托单位：
THE UNIVERSITY OF TOKYO
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1992
项目状态：
已结题

项目摘要

1. Nitrite Ion/Chloride Ion Molar Ratio above which Corrosion is Prevented(1) The threshold value of molar ratio increases as the chloride content in concrete increases.(2) Corrosion of reinforcing bar can be prevented with the molar ratio of 1 or more independent of the chloride content.2. Effect of Nonuniform Distribution of Nitrite on Corrosion Prevention(1) Acceleration of corrosion on the anodic sites due to macrocell corrosion is observed when a small zone without nitrite ions exists in the concrete.(2) No corrosion acceleration due to differential nitrite ion concentrations is observed when nitrite ions are distributed throughout the concrete with the molar ratio of 0.5 or more. Corrosion of reinforcing bar is sufficiently inhibited when nitrite ions are distributed throughout the concrete at the concentration of molar ratio of 1 or more, even if the concentrations are not uniform.3. Permeation of Nitrite IonsThe low-pressure injection method of corrosion inhibitor enables nitrite ions to permeate concrete fast and in a wide range. However, corrosion inhibitor cannot permeate much in wet condition.4. Repair Method for Corrosion of Reinforcing BarsThe low-pressure injection method using nitrite corrosion inhibitor can be very effective and practical for corrosion prevention of reinforcing bars in a state of corrosion in which minute cracks are occurring on the surface of concrete.

1.防止腐蚀的亚硝酸根/氯离子摩尔比(1)摩尔比门槛值随混凝土中氯离子含量的增加而增加。(2)摩尔比为1或更多时，钢筋的锈蚀与氯离子含量无关。亚硝酸盐分布不均匀对防腐的影响(1)当混凝土中存在一个没有亚硝酸根离子的小区域时，由于宏电池腐蚀而加速了阳极位置的腐蚀。(2)当亚硝酸根离子分布在混凝土中的摩尔比为0.5或更高时，没有观察到由于亚硝酸根离子浓度不同而导致的腐蚀加速。当亚硝酸根离子以摩尔比1或更大的浓度分布在混凝土中时，即使浓度不均匀，也能充分抑制钢筋的锈蚀。亚硝酸盐离子的渗透缓蚀剂的低压注入方法使亚硝酸盐离子能够快速、广泛地渗透到混凝土中。但在潮湿条件下，缓蚀剂不能很好地渗透。钢筋锈蚀修复方法亚硝酸盐缓蚀剂低压注入法对于混凝土表面出现微小裂缝的锈蚀状态下的钢筋防腐，是一种非常有效和实用的方法。