The uptake of chloride (Cl) and isosaccharinic acid (ISA, main degradation product of cellulose) by cement paste with high slag content (CEM III/C) was investigated with batch sorption experiments with Cl and inactive ISA. A weak uptake of chloride was quantified (0.43 ≤ R [L∙kg] ≤ 5.8), consistently with previous observations for Portland cement. C-S-H, AFm and hydrotalcite are suggested as primary sinks for Cl. XRD confirmed the formation of Friedel's salt at [NaCl] ≥ 1 M, consistent with thermodynamic calculations. ISA exhibited moderate sorption (9 ≤ R [L∙kg] ≤ 900), successfully modeled with a one-site Langmuir isotherm. Sorption data supports that (surface) precipitation occurs at higher ISA concentrations. The formation of stable Ca-ISA aqueous complexes promotes the incongruent dissolution of cement phases, altering of the overall Ca:Si ratio. The interplay between sorption and solubility phenomena must be considered for a correct interpretation of cement-ISA systems.

中文翻译：

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高矿渣含量水泥浆对氯化物和异糖精酸的吸收（CEM III/C）

通过 Cl 和非活性 ISA 的批量吸附实验，研究了高矿渣含量水泥浆 (CEM III/C) 对氯化物 (Cl) 和异糖精酸（ISA，纤维素的主要降解产物）的吸收。对氯化物的微弱吸收进行了量化（0.43 ≤ R [L∙kg] ≤ 5.8），与之前对波特兰水泥的观察结果一致。建议 CSH、AFm 和水滑石作为 Cl 的主要汇。 XRD 证实在 [NaCl] ≥ 1 M 时形成弗里德尔盐，与热力学计算一致。 ISA 表现出中等吸附（9 ≤ R [L∙kg] ≤ 900），成功地用单点 Langmuir 等温线建模。吸附数据支持在较高的 ISA 浓度下会发生（表面）沉淀。稳定的 Ca-ISA 水性复合物的形成促进了水泥相的不一致溶解，改变了总体 Ca:Si 比率。为了正确解释水泥-ISA 系统，必须考虑吸附和溶解现象之间的相互作用。