摘要
建筑结构混凝土随着时间的推移,普遍面临耐久性降低的问题,尤其是在沿海及高原等特殊环境中。本文以深圳典型滨海建筑为对象(海水Cl浓度达15000~20000mg/L),通过预埋传感器实时检测发现:氯离子渗透深度5年内达10cm,且腐蚀电流密度与裂缝长度呈指数正相关(5年从2μA/cm²增至18μA/cm²)。基于此,提出处治技术:①裂缝按宽度分级修复(封闭/注浆/加固密封);②针对氯盐侵蚀采用电化学除盐(ECE)与硅烷浸渍工艺——ECE优先迁移钢筋附近Cl-(20mm处浓度降59%),硅烷阻隔表层侵入(0mm浓度仅0.08%)。最终构建“实时检测-分级修复”的防控体系,为沿海混凝土结构耐久性提升提供闭环解决方案。
With the passage of time,building structural concrete is generally faced with the problem of reduced durability,especially in special environments such as coasts and plateaus.In this paper,a typical coastal build‐ing in Shenzhen was taken as the object(the concentration of Cl in seawater reached 15000~20000 mg/L).Through real-time monitoring of embedded sensors,it was found that the penetration depth of chloride ions reached 10cm within 5years,and the corrosion current density was exponentially positively correlated with the crack length(in‐creased from 2μA/cm2 to 18μA/cm2 in 5years).Based on this,the treatment technology was proposed:①The cracks are repaired according to the width(sealing/grouting/reinforcement sealing);①Electrochemical chloride extraction(ECE)and silane impregnation process were used to address chlorine salt erosion-ECE preferentially migrated Clnear the steel bar(the concentration decreased by 59%at 20mm),and silane blocked the surface intrusion(the con‐centration of 0mm was only 0.08%).Finally,a prevention and control system of real-time detection-graded repair is constructed to provide a closed-loop solution for improving the durability of coastal concrete structures.
作者
朱万平
ZHU Wanping(China Metallurgical Building Research Institute(Shenzhen)Co.,Ltd.)
出处
《广东建材》
2025年第9期89-92,共4页
Guangdong Building Materials
关键词
混凝土
耐久性检测
处治措施
Concrete
Durability test
Treatment measures
