This paper presents the influence of mineral additions in blended cement, or ‘green’ concrete, on the divalent ions of the cement paste pore solution. Because of the lack of data concerning the direct comparison between the pore solution of cement and mineral additions-based material, six types of hardened cement pastes were tested. For this purpose, Portland cement (CEM I or CEM V) and mineral additions (limestone filler, fly ash, blast-furnace slag and silica fume) were used. Results from chemical analyses by ionic chromatography show significant concentrations of divalent ions, such as sulfates and calcium, in the pore solution. In fact, the reference cement paste based on CEM I contains about 1.8 mmol/l of calcium and 1.6 mmol/l of sulfates. However, the use of mineral addition significantly modifies the pore solution. In particular, a substitution of cement by 10% of silica fume increases the calcium and sulfates concentrations to 12.2 mmol/l and 6.7 mmol/l, respectively. This change in the chemical composition, the pH and the ionic strength should be taken into account in multispecies transfer modelling and the thermodynamic equilibrium. The time evolution of the chemical composition, pH and ionic strength of the pore solutions was also investigated.

中文翻译：

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添加矿物的硬化水泥浆体孔隙溶液的化学性质

本文介绍了在混合水泥或“绿色”混凝土中添加矿物质对水泥浆孔隙溶液中二价离子的影响。由于缺乏有关水泥和矿物添加基材料之间直接比较的数据，因此测试了六种类型的硬化水泥浆。为此，使用了波特兰水泥（CEM I 或 CEM V）和矿物添加剂（石灰石填料、粉煤灰、高炉矿渣和硅粉）。离子色谱法的化学分析结果表明，孔溶液中二价离子（例如硫酸盐和钙）的浓度很高。事实上，基于 CEM I 的参考水泥浆含有约 1.8 mmol/l 的钙和 1.6 mmol/l 的硫酸盐。然而，矿物添加的使用显着改变了孔隙溶液。特别是，用 10% 的硅粉代替水泥，钙和硫酸盐的浓度分别增加到 12.2 mmol/l 和 6.7 mmol/l。在多物种转移模型和热力学平衡中，应考虑化学成分、pH 值和离子强度的这种变化。还研究了孔隙溶液的化学成分、pH 值和离子强度随时间的变化。