Mundra Shishir, Rossi Emanuele, Malenica Luka, Pundir Mohit, Angst Ueli M
Institute for Building Materials, ETH Zürich, Laura-Hezner-Weg 7, 8093 Zurich, Switzerland.
Mater Struct. 2025;58(3):90. doi: 10.1617/s11527-025-02614-z. Epub 2025 Mar 13.
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, in the majority of studies 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.
The online version contains supplementary material available at 10.1617/s11527-025-02614-z.
众所周知，钢筋混凝土中钢 - 混凝土界面处的宏观孔隙及其电解质水溶液的饱和度在钢筋腐蚀过程中起着重要作用。无论暴露条件和测试参数如何，在大多数研究中，据报道腐蚀产物始终以独特的模式在这些宏观孔隙内沉淀，优先沿着孔隙壁向内生长。宏观孔隙中腐蚀产物沉淀的潜在机制及其对长期耐久性的影响仍不清楚。在此，通过原位X射线计算机断层扫描观察、热力学和动力学考量以及宏观孔隙内水传输的数值模拟，我们提出了关于孔隙壁上腐蚀产物沉淀过程的合理假设。了解腐蚀产物沉淀机制有助于深入了解宏观界面孔隙及其周围的应力发展以及钢筋混凝土结构的耐久性。本论文还讨论了不同研究途径的机会，以阐明影响钢筋混凝土耐久性的几个多尺度过程。
在线版本包含可在10.1617/s11527 - 025 - 02614 - z获取的补充材料。
