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迁移性阻锈剂在混凝土中的渗透性能研究
作者：刘喜旭1，张小平2，严涵2，马琳2，柯伟席2
（1.武汉三源特种建材有限责任公司，湖北 武汉 430070；2.武汉源锦建材科技有限公司，湖北 武汉 430070）
摘要：通过测试氨氮浓度表征阻锈剂在不同龄期混凝土中迁移规律。采用纳氏试剂分光光度法和凯氏定氮法对比测试不同养护条件对阻锈剂渗透性能及氯离子迁移系数的影响。结果表明，混凝土中（50±5） mm处氨氮浓度随着养护龄期延长呈先增大后平稳的趋势，干养条件更有利于阻锈剂在混凝土内部迁移；迁移性阻锈剂对混凝土强度无负面影响，掺阻锈剂混凝土的氯离子迁移系数均低于空白组，迁移性阻锈剂能显著提高混凝土的耐久性。
关键词：迁移阻锈剂；氨氮浓度；强度；氯离子迁移
中图分类号：TU528.042+.6 文献标识码：A 文章编号：1001-702X（2023）01-0056-03
Study on permeability of migrating rust inhibitor in concrete
LIU Xixu1，ZHANG Xiaoping2，YAN Han2，MA Lin2，KE Weixi2
（1.Wuhan Sanyuan Special Building Materials Co. Ltd.，Wuhan 430070，China；
2.Wuhan Yuanjin Building Materials Technology Co. Ltd.，Wuhan 430070，China）
Abstract：The migration law of rust inhibitor in concrete of different ages was characterized by measuring the concentration of ammonia nitrogen. Nessler reagent spectrophotometry and Kjeldahl method were used to compare the effects of different curing conditions on permeability and chloride ion migration coefficient. The results show that the concentration of ammonia nitrogen at（50±5） mm in concrete increases first and then becomes stable with the increase of curing age. Dry curing is more conducive to the migration of rust inhibitor in concrete. The migrating rust inhibitor has no negative effect on the strength of concrete，and the chloride ion migration coefficient is lower than that of the blank group. The migrating rust inhibitor significantly improves the durability of concrete.
Key words：migration rust inhibitor，ammonia nitrogen concentration，strength，chloride ion migration