迁移型阻锈剂对碳化混凝土耐久性的维护作用

Durability Maintenance Effect of Migrating Corrosion Inhibitor on Carbonized Concrete

基于迁移型阻锈剂的已有研究成果,包括其基本原理、物理性能、渗透机理、渗透性能、阻锈机理、阻锈性能及其对混凝土特性的影响等,设计完成了碳化混凝土中迁移型阻锈剂对钢筋的保护性能试验;通过对试验结果的研究,讨论了混凝土碳化条件下以及碳化且氯离子侵蚀同时发生条件下,迁移型阻锈剂对混凝土构件耐久性的维护作用及对混凝土碳化速率和混凝土孔隙溶液液相碱度的影响;分析了混凝土碳化条件下迁移型阻锈剂维护钢筋钝化状态的作用机理,并总结了不同施用方法对迁移型阻锈剂作用效果的影响。试验结果表明:迁移型阻锈剂通过在钢筋表面形成保护层保护钢筋,其作用效果与碳化层深度、氯离子含量及施用方法有关;碳化层尚浅时施用迁移型阻锈剂,可以成功保护钢筋不受腐蚀;迁移型阻锈剂与混凝土的碳化速度并无直接关系。

Based on the known properties of surface applied migrating corrosion inhibitor （MCI）, including basic concept, physical performance, penetration mechanism and effectiveness, protection mechanism and effectiveness, and the influence on concrete material, the test of protection effectiveness of MCI on steel in carbonized concrete was designed and performed. Based on the test data, durability maintenance effects of MCI in the situation of carbonization and carbonization as well as chloride intrusion were discussed, influences of MCI on carbonization speed and alkalinity of concrete pore solution were also discussed, protection mechanism of MCI on steel in the situation of carbonization was analyzed, and effectiveness comparisons of different application methods of MCI were made. The test results show that MCI effects by forming protection layer around steel, the effectiveness concerns depth of carbonization, chloride content and application method. MCI applied at early stage of carbonization can effectively protect steel in long-term. MCI has nothing to do with carbonization rate of concrete.