（1 重庆交通大学土木工程学院， 重庆 400074； 2 浙江大学宁波理工学院， 宁波 315100; 3 浙江大学结构工程研究所， 杭州 310058)

［摘要］海岛钢筋混凝土建筑处于典型海洋腐蚀环境中，混凝土结构耐久性问题非常突出。对宁波市某海岛建筑群进行了混凝土耐久性现场检测，并对关键构件进行了破坏性试验，研究和评估了该海岛建筑的服役性能。结果表明，既有海岛混凝土结构存在严重的氯离子浓度超阈值、钢筋锈蚀、构件延性降低等现象；通过对比新旧结构设计规范，从材料层面和构件层面分析了既有海岛建筑存在的问题。最后，采用双向电渗技术对海岛建筑进行了混凝土耐久性提升。

［关键词］海岛建筑； 钢筋混凝土； 钢筋锈蚀； 耐久性； 双向电渗

中图分类号：TU398+.5文献标识码：A文章编号：1002-848X(2018)02-0014-05

Situation and improving method of concrete structure durability for an island building group in Ningbo

Zhu Yaofeng1,2, Mao Jianghong2, Jin Weiliang2,3, Wang Jianxin2, Xu Chen3, Shen Jiansheng2, Xu Yidong2

(1 University of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China; 2 Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China; 3 Institute of Structural Engineering, Zhejiang University， Hangzhou 310058, China)

Abstract:The island reinforced concrete building is located at typical marine corrosion environment, concrete structure durability is very prominent. The concrete durability spot inspection to island construction group in Ningbo and the key component of the destructive test were carried out, the service performance of the island building was studied and evaluated. The results show that the existing island concrete structure had the phenomenon of serious chloride ion concentration, steel bar corrosion, component ductility reduction and so on. Through contrasting the new and old structural design specifications, existing problems of island building from the material level and the component level were analyzed. Finally, the method of bi-directional electro-migration rehabilitation(BIEM) to improve the durability of island building concrete was proposed.

Keywords:island building; reinforced concrete; steel bar corrosion; durability; bi-directional electro-migration rehabilitation

*国家自然科学基金项目(51638013,51578490)，浙江省自然科学基金（LY18E080003,LY15E080025），宁波市自然科学基金（2016A610215, 2017A610313），宁波市科技惠民项目(2016C51024)，国家科技支撑计划项目（2015BAL02B03）。

通讯作者：毛江鸿，博士，副教授，Email：jhmao@nit.zju.edu.cn。