The current paper investigates the impact of gluconate, D-sorbitol, d-mannitol and D-galactitol on calcium speciation at high pH values by i) solubility measurements of portlandite (Ca(OH)₂) and ii) potentiometric titration measurements of calcium salt solutions. Thermodynamic modelling was used to fit the chemical activities of Ca²⁺ and OH⁻ ions and thus to determine the strength and kind of the different Ca-organic-hydroxide complexes. The strength of complex formation with Ca²⁺ decreases in the order gluconate ≫ sorbitol > mannitol > galactitol, which follows the same order as sorption on portlandite. Heteropolynuclear gluconate complexes with calcium and hydroxide dominate the Ca-speciation in the presence of portlandite, while for sorbitol ternary CaSorbOH⁺ complexes were dominant under alkaline conditions. We expect that these results will help in better understanding the influence of gluconate and hexitols on the hydration of alite and Portland cement.

本论文通过 i) 硅酸盐 (Ca(OH) ₂ ) 的溶解度测量和 ii) 钙盐的电位滴定测量，研究了葡萄糖酸、D-山梨糖醇、d-甘露醇和 D-半乳糖醇在高 pH 值下对钙形态形成的影响解决方案。热力学模型用于拟合 Ca ²⁺和 OH ^-离子的化学活性，从而确定不同 Ca-有机-氢氧化物配合物的强度和种类。与 Ca ²⁺形成络合物的强度葡萄糖酸 ≫ 山梨糖醇 > 甘露糖醇 > 半乳糖醇的顺序减少，这与在硅酸盐上的吸附顺序相同。在硅酸盐存在下，钙和氢氧化物的杂多核葡萄糖酸复合物在 Ca 形态形成中占主导地位，而山梨糖醇三元 CaSorbOH ⁺复合物在碱性条件下占主导地位。我们预计这些结果将有助于更好地了解葡萄糖酸盐和己糖醇对阿利特和波特兰水泥水化的影响。