Influence of the applied voltage on the Rapid Chloride Migration (RCM) test
Influence of the applied voltage on the Rapid Chloride Migration (RCM) test
复制标题
DOI：
10.1016/j.cemconres.2012.04.007
复制
发表时间：
2012-08-01
影响因子：
11.4
通讯作者：
Brouwers, H. J. H.
中科院分区：
文献类型：
--
作者：
Spiesz, P.;Brouwers, H. J. H.
本研究探讨了所施加的电压（电场）对通过快速氯化物迁移 (RCM) 测试确定的氯化物迁移系数值以及对水泥基砂浆其他性能的影响。结果表明，在所研究的施加电压范围内，根据两种不同的氯离子传输模型计算出的氯离子迁移系数相对恒定。然而，由于电场的应用，砂浆的其他性能正在发生变化。结果表明，在迁移测试过程中测试样品的电阻增加（因此测试期间的直流电流减小）。此外，样品的质量增加，并且发现这种增加与氯化物渗透深度成正比。在迁移测试过程中，阴极电解液（10% NaCl水溶液）的pH值显着升高，因此测试条件随着OH-与Cl-比例的变化而变化。此外，电极极化的测量值证实了 RCM 测试指南中假设的 2 V 值。此外，在测试后、在喷洒比色氯化物指示剂之前，在分离的样品上观察到深色。这种着色归因于样品仅在着色区域中的液体饱和，而不是在样品的整个体积中，正如在迁移测试之前进行真空饱和之后所假设的那样。 (C) 2012 Elsevier Ltd. 保留所有权利。
This study addresses the influence of the applied voltage (electrical field) on the value of the chloride migration coefficient, as determined with the Rapid Chloride Migration (RCM) test, and on other properties of cement based mortars. It is shown that in the investigated ranges of applied voltages, the chloride migration coefficients, computed from two different chloride transport models, are relatively constant. However, other properties of mortars are changing due to the application of the electrical field. It is shown that the resistance of the test samples increases during the migration test (therefore the DC current during the test decreases). Moreover, the mass of the samples increases and this increase is found to be proportional to the chloride penetration depth. The pH of the catholyte solution (10% NaCl water solution) increases significantly during the migration test, thus the test conditions change as the OH- to Cl- proportion changes. Furthermore, the measured values of the polarization of the electrodes confirm the value of 2 V. assumed in the guidelines for the RCM test. Also, a dark coloration is observed on samples split after the test, prior to spraying with the colorimetric chlorides indicator. This coloration is attributed to a liquid-saturation of the samples only in the colored region and not in the entire volume of the sample, as is assumed after performing the vacuum-saturation prior to the migration tests. (C) 2012 Elsevier Ltd. All rights reserved.