Cl-作用下混凝土结构的破坏分析与耐久性设计

钢筋锈蚀是影响混凝土结构耐久性和安全性的重要因素,耐久性的好坏决定着结构的使用寿命。对近海及沿海地区的钢筋混凝土结构,导致结构性能劣化的最普遍、最严重的原因是氯离子侵蚀作用引起的钢筋锈蚀。本文介绍了氯离子的来源及其侵入混凝土中的方式,从氯离子引起钢筋锈蚀的机理、混凝土中钢筋锈蚀的过程及其对结构性能的影响等方面对混凝土结构的耐久性破坏进行分析。最后,基于氯离子侵蚀作用,探讨了耐久性设计的方法,以便于提高混凝土结构的使用寿命。

Failure Analyses and Durability Designs of Concrete Structures on the Effect of Chloride Ion

Reinforcement corrosion is the important effect on the durability and safety of reinforcement concrete(RC) structures.Service life of concrete structures depends on its durability.The most normal and most serious reason,which caused degraded performance of RC structures in costal area,is chloride-induced corrosion.In this paper,the origin of chloride ion and its entry way is introduced.Durable damage for concrete structures is studied from aspects of mechanism as well as process caused the corrosion of reinforcing steel,and effect of structure performance.Finally,for the sake of improving the service life of concrete structures,some durability designs of concrete structures that based on erosion effect of chloride ion are discussed.