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Experimental and modeling studies on installation of arc sprayed Zn anodes for protection of reinforced concrete structures

机译：安装电弧喷涂锌阳极以保护钢筋混凝土结构的实验和建模研究

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摘要

Arc sprayed zinc (Zn) anode on concrete surfaces has been an emerging technology for protecting reinforced concrete structures from rebar corrosion in coastal environments. Many cathodic protection (CP) systems with arc sprayed Zn anodes will reach or exceed their design life in the near future and thus may function improperly or insufficiently, making it necessary to replace the aged anodes. However, prior to this study, little was known about the most effective profile for the concrete surface, for either new concrete or old concrete with existing Zn anodes removed. This work develops criteria to properly prepare the concrete surface before the application of new Zn anode. Experimental studies were conducted both in the laboratory and for a field structure in Oregon. Artificial neural network was used to achieve better understanding of the complex cause-and-effect relationships inherent in the Zn-mortar or Zn-concrete systems and was successful in finding meaningful, logical results from the bond strength data. The goal is to achieve strong initial bond strength of new Zn to concrete, which is essential for long-term performance of the CP system. The results from this case study suggest that it is necessary to adjust the anode removal and surface sandblasting based on the electrochemical age of the existing concrete. In all cases of sandblasting, minimize the exposure of large aggregates (e.g., those bigger than 19 mm in diameter).
机译：混凝土表面的电弧喷涂锌（Zn）阳极已经成为保护沿海地区钢筋混凝土结构免受钢筋腐蚀的新兴技术。许多带有电弧喷涂锌阳极的阴极保护（CP）系统将在不久的将来达到或超过其设计寿命，因此可能会出现功能不当或不足的情况，因此有必要更换老化的阳极。但是，在进行这项研究之前，对于去除了现有锌阳极的新混凝土或旧混凝土，对于混凝土表面最有效的轮廓知之甚少。这项工作提出了在应用新的锌阳极之前正确准备混凝土表面的标准。在俄勒冈州的实验室和野外结构中均进行了实验研究。人工神经网络用于更好地理解Zn砂浆或Zn混凝土系统中固有的复杂因果关系，并成功地从粘结强度数据中找到了有意义的逻辑结果。目标是获得新的Zn与混凝土的强初始粘结强度，这对于CP系统的长期性能至关重要。该案例研究的结果表明，有必要根据现有混凝土的电化学年龄来调整阳极去除量和表面喷砂处理。在喷砂的所有情况下，应尽量减少大聚集体（例如直径大于19毫米的聚集体）的暴露。

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