Investigation of Corrosion Damage and Repair System in a Concrete Jetty Structure
Investigation of Corrosion Damage and Repair System in a Concrete Jetty Structure
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DOI：
10.1061/(asce)cf.1943-5509.0000112
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发表时间：
2010-07-01
影响因子：
2.5
通讯作者：
Mobasher, Barzin
中科院分区：
文献类型：
--
作者：
Moradi-Marani, Farid;Shekarchi, Mohamad;Mobasher, Barzin
本文介绍了使用 15 年后的钢筋混凝土码头的诊断调查。恶化的主要原因是钢筋腐蚀，这种腐蚀是在码头结构完工后几年内开始的。该结构在使用 7 年后进行了重大腐蚀修复。尽管在码头结构的建造中使用了高强度混凝土，但钢筋混凝土构件的保护层厚度不足加剧了腐蚀速度，并导致早期腐蚀问题再次出现。其他影响因素包括由于气候因素（例如暴露于高相对湿度和空气温度）的同时作用而导致海水的高盐度。初步修复工作结束后，进行了新的调查程序，重新评估已修复和周围未修复的区域。结果表明，即使是在调查的第一步中未损坏的混凝土构件，也在恶化。修复区域未出现钢材腐蚀迹象；但修复区域周围的收缩开裂和初期腐蚀表明修复混凝土与基材之间的尺寸和电化学不相容。通过Andrade和Izquierdo提出的修复指数方法重新评估修复策略。结果表明，与其他技术相比，修补修复方法更加合适、可行。
This paper presents the diagnostic investigation of a reinforced concrete jetty after 15 years of service. The main cause of the deterioration was reinforcement corrosion, which initiated within few years after the completion of the jetty structure. The structure underwent major corrosion rehabilitation after 7 years of service. Despite the use of high-strength concrete in the construction of the jetty structure, inadequate cover thickness for reinforced concrete elements intensified corrosion rate and caused early age corrosion problems to reappear. Other contributing factors included high salinity of the seawater by simultaneous action of climatic factors such as exposure to high relative humidity and air temperature. After the initial repair work, a new investigative procedure was carried out to reevaluate the repaired and surrounding unrepaired areas. Results indicate that the deterioration progressed even in concrete elements that were undamaged during the first step of the investigation. No sign of steel corrosion appeared on repaired areas; but shrinkage cracking and incipient corrosion around repaired areas were indications of dimensional and electrochemical incompatibility between repair concrete and substrate. The repair strategy was reevaluated through the repair index method proposed by Andrade and Izquierdo. The results showed that the patching repair method was more suitable and feasible in comparison with other techniques.