The effects of corrosion methods, galvanostatic (GS) vs. artificial climate environment (ACE), on the relationships between corrosion products and corrosion cracks of corroded reinforced concrete beams are investigated. The experimental results show that the GS method induces smaller corrosion crack width. A novel quantitative detection method of corrosion product thickness using X-ray and digital image processing techniques is proposed for investigating the continuous development of corrosion products. As the corrosion level increases, a smaller steel-to-rust volume expansion ratio caused by continuous leakage and a lower oxidation degree of corrosion products for the GS specimens are the major reasons for the smaller corrosion cracks. Regarding the effect of rebar arrangement on the development of corrosion-induced cracks, the expansion stress from corner-located rebars restrained the growth of corrosion products and further limited the propagation of corrosion-induced cracks of the center rebar. Estimated corrosion crack width via FE analysis using measured corrosion products as input show good agreement with experimental results.

中文翻译：

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使用通过 X 射线技术量化的腐蚀产物以及单根和多根钢筋梁的有限元分析来研究腐蚀引起的裂纹


研究了腐蚀方法（恒电流（GS）与人工气候环境（ACE））对腐蚀钢筋混凝土梁腐蚀产物和腐蚀裂纹之间关系的影响。实验结果表明，GS方法产生的腐蚀裂纹宽度更小。为了研究腐蚀产物的持续发展，提出了一种利用X射线和数字图像处理技术定量检测腐蚀产物厚度的新方法。随着腐蚀程度的增加，连续渗漏导致的钢锈体积膨胀比变小以及GS试件腐蚀产物氧化程度降低是腐蚀裂纹变小的主要原因。对于钢筋布置对腐蚀裂纹发展的影响，角部钢筋的膨胀应力抑制了腐蚀产物的生长，并进一步限制了中心钢筋腐蚀裂纹的扩展。使用测得的腐蚀产物作为输入，通过有限元分析估计的腐蚀裂纹宽度与实验结果吻合良好。