Accelerated Testing for Concrete Reinforcing Bar Corrosion Protection Systems

当前研究的目标是为广泛的防腐系统开发加速实验室测试与现场性能之间的详细相关性。这项研究是与堪萨斯州交通部和防腐系统制造商合作进行的，利用了堪萨斯州东北部正在进行的评估桥面性能的州和大学调查。该研究包括对实验室测试程序的评估和修改，以确定那些与钢筋混凝土桥面在正常和加速暴露下的腐蚀行为最匹配的测试程序。腐蚀评估技术涉及环氧涂层钢筋、修正抑制外加剂、耐腐蚀钢、不同除冰剂的影响以及混凝土配合比的修改。现场测试平台要经受与桥梁腐蚀环境相匹配的腐蚀环境和与实验室腐蚀环境相匹配的腐蚀环境。腐蚀性能的直接关联将允许建立更有效和合理的评估技术。最终结果将是更有效的选择程序，更快地将腐蚀技术应用于实践，延长结构使用寿命，并全面降低与钢筋混凝土结构中氯化物腐蚀相关的维修和修复成本。

The goal of the current study is to develope a detailed correlation between accelerated laboratory test and field performance for a broad range of corrosion protection systems. The study, carried out in partnership wiith the Kansas Department of Transportation and the manufactures of corrosion protection systems, takes advantage of ongoing state and university surveys in northeast Kansas evaluating the performance of bridge decks. The study includes the evaluation and modification of laboratory test procedures to establish those that provide the best match with the corrosion behavior of reinforced concrete bridge decks subjected to normal and accelerated exposure. The corrosion evaluation techniques address the protection provided by epoxy-coated bars, correction inhibiting admixtures, corrosion-resistant steel, the effects of different deicers, and modifications in concrete mix proportions. The field test platforms are subjected to corrosion environments matching those of the bridge and to aggressive corrosion environments matching those obtained in the labortory. Direct correlation of corrosion performance will allow more effective and rational evaluation techniques to be instituted. The final result will be more efficient selection procedures, more rapid movement of corrosion technology into practice, the extension of structure service life, and the overall reduction in the repair and rehabilitation cost associated with chloride induced corrosion in reinforced concrete structures.