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首页> 外文期刊>ACI Materials Journal >Ten-Year Field Evaluation of Corrosion-Inhibiting Systems in Concrete Bridge Barrier Walls
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Ten-Year Field Evaluation of Corrosion-Inhibiting Systems in Concrete Bridge Barrier Walls

机译：混凝土桥梁屏障墙的腐蚀抑制系统十年现场评估

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摘要

The performance of eight commercial corrosion-inhibiting systems was assessed in the field over 10 years on reinforced concrete barrier walls of a highway bridge that was subjected to severe environmental conditions. These systems were composed of one or more of the following components: anticorrosion concrete admixtures, reinforcement coatings, and concrete surface coatings/sealers. The field evaluation consisted of annual surveys of corrosion potential and corrosion rate, as well as visual inspections and testing of concrete cores. After 10 years, the main reinforcement of the barrier walls, at a depth of 75 mm (3 in.), was found in relatively good condition due to an initially high-quality concrete. Special bars embedded at a depth of 13 mm (1/2 in.) in the barrier walls showed signs of advanced corrosion for all systems; however, no visible signs of corrosion were found on 25 mm (1 in.) deep bars. Nondestructive corrosion evaluation over the 25 mm (1 in.) deep ladder reinforcing bars indicated that the system containing the inorganic anticorrosion admixture provided consistently lower risks of corrosion, followed by systems containing organic anticorrosion admixtures, in comparison to the control system and other systems. The low concrete permeability and different stability of the protective layer forming on the bars may explain the observed differences in the effectiveness of these systems.
机译：在遭受严酷环境条件的公路桥梁的钢筋混凝土阻隔墙上，在过去的十年中，对八个商用缓蚀系统的性能进行了评估。这些系统由以下一种或多种成分组成：防腐混凝土外加剂，增强涂料和混凝土表面涂料/密封剂。现场评估包括对腐蚀潜力和腐蚀速率的年度调查，以及混凝土芯的目视检查和测试。 10年后，由于最初使用的是优质混凝土，因此发现隔离墙的主要加固深度为75毫米（3英寸），处于相对良好的状态。嵌在隔离墙中13毫米（1/2英寸）深度的特殊钢筋显示出对所有系统的高级腐蚀迹象。但是，在25毫米（1英寸）深的钢筋上未发现明显的腐蚀迹象。在25毫米（1英寸）深的梯形钢筋上进行的无损腐蚀评估表明，与控制系统和其他系统相比，含有无机防腐混合物的系统始终提供较低的腐蚀风险，其次是含有有机防腐混合物的系统。混凝土渗透性低和在钢筋上形成的保护层的稳定性不同，可以解释所观察到的这些系统有效性的差异。

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