干湿交替-弯曲荷载耦合作用下混凝土的反渗防腐探究  

Research on anti corrosion of the concrete by reverse osmosis under interaction of the load and alternating dry and wet

作　　者：丁建昭 肖良 梅国雄[1,2,3] 何思宏 李子亨[2,3] DING Jianzhao;XIAO Liang;MEI Guoxiong;HE Sihong;LI Ziheng(China Institute of Port Coastal and Offshore Engineering,Zhejiang University,Hangzhou 310058,China;College of Civil Engineering and Architecture,Nanning 530004,China;Key Laboratory of Engineering Disaster Prevention and Structural Safety of Ministry Education,Nanning 530004,China)

机构地区：[1]浙江大学海洋结构物与船舶工程研究所,浙江杭州310058 [2]广西大学土木建筑工程学院,广西南宁530004 [3]工程防灾与结构安全教育部重点实验室,广西南宁530004

出　　处：《混凝土》2025年第1期7-14,共8页Concrete

基　　金：国家自然科学基金(52178321,51878185);广西区级创新培训项目(202010593167)。

摘　　要：海洋混凝土耐久性问题是海洋强国战略的重要课题,其中氯离子侵蚀内部钢筋是混凝土腐蚀的主要原因之一。氯离子通过扩散、对流、毛细等多种传输方式进入混凝土,当自由氯离子达到临界值后,将破坏内部钢筋钝化膜并产生腐蚀产物,从而损害混凝土结构。混凝土在海洋干湿交替区中受腐蚀最严重。在带弯曲荷载的混凝土试件中进行干湿交替试验,并采用反向水压提高混凝土的内部饱和度。结果显示,反向水压可以有效地抑制氯离子地运移和扩散,从而提高混凝土的防腐蚀性。The durability of marine concrete is a significant concern for marine infrastructure,with chloride ion attack on internal steel reinforcement being a primary cause of concrete corrosion.Chloride ions can penetrate concrete via diffusion,convection,and capillary transport,and when free chloride ions accumulate to a critical level,they can damage the passivation film on internal steel reinforcement and generate corrosion products,ultimately compromising the structural integrity of the concrete.Concrete corrosion is most severe in the wet-dry zone of marine environments.It subjected concrete specimens to a wet-dry cycle test with a bending load and utilized reverse osmosis technology to increase the internal saturation of the concrete.The results indicate that reverse water pressure can effectively suppress the migration and diffusion of chloride ions,thereby enhancing the corrosion resistance of the concrete.

关 键 词：混凝土 氯离子腐蚀 弯曲荷载 干湿交替 反向水压 

分 类 号：TU528.01[建筑科学—建筑技术科学]