In this paper, multi-ion transference numbers were determined throughout the chloride migration testing of low clinker cement-based materials. For this purpose, five cement pastes were studied: pure Portland paste (as a reference) and four other pastes, based on limestone filler, fly ash, slag or silica fume. The transference numbers were calculated from the concentration evolution in the three zones of the migration cell (catholyte, anolyte and sample), considering that: (i) ions moved in the catholyte and anolyte; (ii) ions leached from the sample; (iii) ions were generated from the electrode processes, and (iv) the pore solution of the sample evolved during the test. The chloride transference numbers of pastes with pure Portland cement, limestone filler, fly ash, slag or silica fume are almost zero at the beginning of the migration test but 0.23; 0.18; 0.06; 0.05 and 0.20 at the end of the test, respectively. The ion transference numbers obtained were used for the calculation of diffusion coefficients of chlorides, sodium and potassium using the Nernst-Einstein equation.

中文翻译：

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低熟料胶凝材料中添加剂对多离子转移数和扩散系数影响的实验研究


在本文中，在低熟料水泥基材料的整个氯化物迁移测试过程中测定了多离子转移数。为此，研究了五种水泥浆：纯波特兰浆（作为参考）和其他四种基于石灰石填料、粉煤灰、矿渣或硅灰的浆料。迁移数是根据迁移池的三个区域（阴极液、阳极液和样品）的浓度演变计算得出的，考虑到：（i） 离子在阴极液和阳极液中移动;（ii） 从样品中浸出的离子;（iii） 离子是由电极过程产生的，以及 （iv） 样品的孔隙溶液在测试过程中发生。在迁移试验开始时，含有纯波特兰水泥、石灰石填料、粉煤灰、矿渣或硅灰的浆料的氯化物转移数几乎为零，但为 0.23;0.18;0.06;测试结束时分别为 0.05 和 0.20。获得的离子转移数用于使用 Nernst-Einstein 方程计算氯化物、钠和钾的扩散系数。