CORROSION INSPECTION AND ANALYSIS OF COASTAL BRIDGE CONCRETE STRUCTURES IN MARINE ENVIRONMENT
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摘要: 针对日照沿海桥梁的耐久性现状进行调研,通过对桥梁墩身、边梁和栏杆混凝土的保护层厚度、碳化深度以及桥梁不同部位的游离氯离子浓度的检测表明:桥梁混凝土结构保护层厚度偏小、车辆超载、结构设计不合理、施工管理不当、缺乏维护管理是导致沿海桥梁混凝土结构损伤劣化的主要原因。此外,海洋环境中的氯离子和空气中的二氧化碳将导致桥梁混凝土中钢筋腐蚀,海水中的盐在混凝土中结晶将导致桥梁墩身腐蚀破坏。Abstract: The durability inspection of bridge concrete structures in Rizhao coastal area was carried out. And theinvestigation on cover thickness, carbonation depth and free chloride concentration of bridge concrete was executed.The inspection resulted showed that the concrete cover thickness of bridge structures was less than the designed valueand results in durability problem; the unreasonable structure design, unsuitable construction management, shortagemaintenance and excess load were the main reasons of damage to coastal bridges. Moreover, the ingressive chlorideand carbonation would lead to corrosion of steel bar in bridge structures. And the crystalline salt would result inphysical deterioration of bridge concrete.
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Key words:
- coastal bridge /
- concrete /
- steel corrosion /
- cover thickness /
- structure design
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