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arXiv 2408.05028cond-mat.mtrl-sci
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钢-混凝土界面宏观孔隙中腐蚀产物的析出——观测、机制与研究需求

Precipitation of corrosion products in macroscopic voids at the steel-concrete interface -- observations, mechanisms and research needs

Shishir Mundra, Emanuele Rossi, Luka Malenica, Mohit Pundir, Ueli M. Angst

AI总结:

本研究结合原位X射线CT、热力学/动力学分析与水分输运数值模拟,解释钢-混凝土界面宏观孔隙中腐蚀产物沿孔壁析出并向内生长的机制及其耐久性意义。

摘要:

已知钢-混凝土界面处的宏观孔隙及其被含水电解质饱和的程度,在钢筋混凝土中钢材的腐蚀过程中发挥重要作用。无论暴露条件和测试参数如何,已有报道均指出,腐蚀产物在这些宏观孔隙内始终以一种独特模式析出:优先沿孔壁分布并向内部生长。控制宏观孔隙中腐蚀产物析出的潜在机制及其对长期耐久性的影响仍不清楚。本文通过原位X射线计算机断层扫描观测、热力学与动力学分析,以及对宏观孔隙内水分输运的数值模拟,提出了关于腐蚀产物沿孔壁析出过程的合理假设。理解腐蚀产物析出机制,有助于认识宏观界面孔隙内部及周围应力的发展,以及钢筋混凝土结构的耐久性。本文还讨论了阐明若干影响钢筋混凝土耐久性的多尺度过程的不同研究路径所带来的机遇。

英文摘要:

Macroscopic voids at the steel-concrete interface and their degree of saturation with an aqueous electrolyte are known to play an important role in the corrosion of steel in reinforced concrete. Irrespective of the exposure conditions and testing parameters, corrosion products have been reported to consistently precipitate in a unique pattern within these macroscopic voids, preferentially along the void walls and growing inward. The underlying mechanisms governing corrosion product precipitation in macroscopic voids and their effects on long-term durability remain unclear. Through in-situ X-ray computed tomography observations, thermodynamic and kinetic considerations, and numerical modelling of water transport within macroscopic voids, here, we provide plausible hypotheses of the processes responsible for the precipitation of corrosion products along the walls of the voids. Understanding the mechanisms of corrosion product precipitation can offer insights into the development of stresses in and around the macroscopic interfacial void and the durability of reinforced concrete structures. This contribution also discusses opportunities for different avenues for research to elucidate several multiscale processes that influence the durability of reinforced concrete.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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