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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Microstructural changes in a cementitious membrane due to the application of a DC electric field
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Microstructural changes in a cementitious membrane due to the application of a DC electric field

机译：直流电场的作用导致胶结膜的微结构变化

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The use of electromigration techniques to accelerate chloride ions motion is commonly employed to characterise the permeability of cementitious samples to chlorides, a relevant parameter in reinforced concrete corrosion. This paper is devoted to the study of microstructure's changes occurring in mortar samples when submitted to natural diffusion and migration experiments. The application of an electric field reduces testing time in about one order of magnitude with respect to natural diffusion experiments. Nevertheless, the final sample's microstructure differs in both tests. Impedance Spectroscopy is employed for real time monitoring of microstructural changes. During migration experiments the global impedance undergoes important increase in shorter period of time compared to natural diffusion tests. So, the forced motion of ions through the concrete membrane induces significant variations in the porous structure, as confirmed by Mercury Intrusion Porosimetry. After migration experiments, an important increase in the capillary pore size (10-100 nm) was detected. Conversely, no relevant variations are found after natural diffusion tests. Results presented in this work cast doubt on the significance of diffusion coefficient values obtained under accelerated conditions.
机译：通常使用电迁移技术来加速氯离子的运动来表征水泥样品对氯化物的渗透性，这是钢筋混凝土腐蚀的一个相关参数。本文致力于研究砂浆样品在进行自然扩散和迁移实验时发生的微观结构变化。相对于自然扩散实验，电场的施加将测试时间减少了大约一个数量级。然而，两种测试中最终样品的微观结构均不同。阻抗谱用于实时监测微结构变化。与自然扩散测试相比，在迁移实验中，整体阻抗在较短的时间内会显着增加。因此，离子通过混凝土膜的强行运动会引起多孔结构的明显变化，如水银压入孔率法所证实的那样。经过迁移实验后，检测到毛细管孔径（10-100 nm）有重要增加。相反，自然扩散测试后未发现相关变化。这项工作提出的结果令人怀疑在加速条件下获得的扩散系数值的重要性。

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