In this study, barium slag (BS) was utilized as a supplementary cementitious material (SCM) to improve the chloride-binding ability of cement pastes. Hardened paste specimens with 0–30% BS content were prepared, and the chloride binding rate (CBR) was evaluated. The compressive strength was tested, and the hydration heat was assessed. The mechanism behind was investigated by XRD, TGA, NMR, EDS, and MIP analyses. The results showed that 10–30% BS greatly promoted the CBR of the cement-BS system. The reasons were demonstrated in three angles: a) the physical resistance of ion-migration was enhanced because of the optimized pore structures; b) the chemically combined chloride was significantly strengthened because the formation of Friedel’s salt in hardened pastes was facilitated; c) the physically adsorbed chloride was reduced because less amount of C–S–H gel was generated. These inferences provided one innovative way of utilizing BS in the Portland cement system and might provide useful experience in promoting the chloride-binding ability of cementitious materials.

中文翻译：

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利用钡渣提高水泥基材料的氯离子结合能力


在这项研究中，利用钡渣（BS）作为辅助胶凝材料（SCM）来提高水泥浆体的氯离子结合能力。制备 BS 含量为 0-30% 的硬化糊状样品，并评估氯离子结合率 (CBR)。测试了抗压强度，并评估了水合热。通过 XRD、TGA、NMR、EDS 和 MIP 分析研究了其背后的机制。结果表明，10%~30%的BS极大地促进了水泥-BS体系的CBR。从三个角度论证了原因：a）优化的孔隙结构增强了离子迁移的物理阻力； b) 由于促进了硬化糊中弗里德尔盐的形成，显着强化了化学结合的氯化物； c) 由于生成的 C-S-H 凝胶量减少，物理吸附的氯化物减少。这些推论提供了一种在波特兰水泥体系中使用BS的创新方法，并可能为提高胶凝材料的氯化物结合能力提供有用的经验。