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首页> 外文会议>NACE annual conference & exposition >REHABILITATION OF REINFORCED CONCRETE COOLING TOWER INPETROCHEMICAL PLANT
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REHABILITATION OF REINFORCED CONCRETE COOLING TOWER INPETROCHEMICAL PLANT

机译：石化厂钢筋混凝土冷却塔的修复

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Severe deterioration of a reinforced concrete cooling tower, which comprised pre-cast columns,beams, wall panels, and slab panels was noticed during the last few years. A diagnostic survey wasconducted to identify the cause and extent of deterioration. The concrete deterioration was veryadvanced in some areas, particularly on the external side of the end walls and posing a safety hazard toplant personal. Internally, the level of defects was very low with only minor patches of delamination andcracks. Both chloride and sulfate ions were present in the concrete cover at rebar depth well in excess oftheir threshold levels. About 12% of the half-cell potential results indicated high (90%) corrosion riskand 53% of the results exhibited medium (50%) corrosion risk in all tested areas of the structure.The investigations concluded that deterioration of concrete has occurred mainly due to chloride-induced corrosion of the steel reinforcement. Patch repair and cathodic protection (CP) repair methodwas recommended to arrest the ongoing corrosion of the steel reinforcement. The CP system design,installation, and initial commissioning results are also described and discussed.
机译：在过去的几年中，人们注意到钢筋混凝土冷却塔的严重退化，该冷却塔包括预制柱，梁，墙板和楼板。进行了诊断调查以查明变质的原因和程度。在某些地方，特别是在端壁的外侧，混凝土的恶化非常严重，对人身安全构成了危害。在内部，缺陷水平非常低，只有少量的分层和裂纹。混凝土盖层中钢筋深度中的氯离子和硫酸根离子都远远超过其阈值水平。半电池潜在结果中约有12％表示腐蚀风险较高（90％），而在该结构的所有测试区域中，有53％的结果显示中等（50％）腐蚀风险。研究得出的结论是，混凝土劣化的主要原因是对氯化物引起的钢筋腐蚀。建议使用修补程序修补和阴极保护（CP）修补方法来阻止钢筋的持续腐蚀。还介绍和讨论了CP系统的设计，安装和初始调试结果。

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