Abstract: The working conditions of concrete dams in cold area are extremely harsh, especially for the water level change area, the concrete is prone to freeze-thaw erosion. The author analyzes the causes of concrete freeze-thaw erosion, and puts forward the repair methods of concrete freeze-thaw erosion and the measures of concrete surface durability protection. In addition, three examples of concrete freeze-thaw erosion repair and surface protection in the water level change area are introduced to provide reference for the treatment of similar defects.

Key words: freeze-thaw erosion, repair, durability protection, SK hand scraped polyurea

摘要： 寒冷地区的混凝土坝工作条件极其苛刻，尤其是水位变化区，混凝土容易发生冻融剥蚀破坏。笔者分析了混凝土冻融剥蚀的原因，提出了寒冷地区混凝土冻融剥蚀的修复方法，以及在混凝土表面进行耐久性防护的措施，介绍了3座大坝水位变化区混凝土冻融剥蚀修复及表面防护实例，为类似工程的缺陷处理提供了借鉴。

关键词: 冻融剥蚀, 修复, 耐久性防护, SK手刮聚脲