钢-混凝土界面宏观空隙中腐蚀产物的沉淀--观察结果、机理和研究需求

Shishir Mundra, Emanuele Rossi, Luka Malenica, Mohit Pundir, Ueli M. Angst
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引用次数: 0

摘要

众所周知,钢筋混凝土界面上的宏观空隙及其与水性电解质的饱和度对钢筋混凝土中的钢筋锈蚀起着重要作用。据报道,无论暴露条件和测试参数如何,腐蚀产物都会以一种独特的模式在这些宏观空隙中持续析出,并优先沿着空隙壁向内生长。宏观空隙中析出腐蚀产物的基本机制及其对长期耐久性的影响仍不清楚。通过原位 X 射线计算机断层扫描观测、热力学和动力学考虑以及宏观空隙内水传输的数值模拟,我们在此对腐蚀产物沿空隙壁析出的过程提出了合理的假设。了解腐蚀产物析出的机理有助于深入了解宏观界面空隙内部和周围的应力发展以及钢筋混凝土结构的耐久性。本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多个多尺度过程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Precipitation of corrosion products in macroscopic voids at the steel-concrete interface -- observations, mechanisms and research needs
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.
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