Scanning electron microscopy, X-ray diffraction, nuclear magnetic resonance, and inductively coupled plasma spectroscopies were used to investigate the dissolution, migration, and coordination state of Al of fly ash (FA) and ground granulated blast-furnace slag (GGBFS) slurry in three different alkaline environments. The results show that in FA–CH pastes, Al dissolved from FA is inclined to enter the structure of C–A–S–H, C₄AH₁₃, and monosulfoaluminate (a small amount); sulfates promote the formation of ettringite and hinder the incorporation of Al in C–S–H. In GGBFS–CH pastes, Al dissolved from GGBFS enters the structure of hydrotalcite (HT), third aluminate hydrate (TAH), and C–A–S–H (a small amount); sulfates promote the migration of Al from TAH (mainly) and C–A–S–H to monosulfoaluminate and ettringite but have little effect on Al in HT. Although the Al₂O₃ content in FA is significantly higher than that in GGBFS, the content of Al-containing products formed in FA pastes is lower than that in GGBFS pastes. In the formed Al-containing products, the content of Al(VI) is significantly higher than that of Al(IV). The ratio of Al(VI)/Al(IV) for GGBFS pastes is significantly higher than that of FA pastes and increases with the increase of sulfate concentration.

中文翻译：

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不同碱性环境下粉煤灰和矿渣浆的比较：铝的溶解、迁移和配位状态

使用扫描电子显微镜、X 射线衍射、核磁共振和电感耦合等离子体光谱来研究粉煤灰 (FA) 和磨碎的高炉矿渣 (GGBFS) 浆料中铝的溶解、迁移和配位状态。三种不同的碱性环境。结果表明，在 FA-CH 糊剂中，从 FA 中溶解的 Al 倾向于进入 C-A-S-H、C ₄ AH _{13 结构}，和单硫铝酸盐（少量）；硫酸盐促进钙矾石的形成并阻碍铝在 C-S-H 中的结合。在 GGBFS-CH 糊剂中，从 GGBFS 中溶解的铝进入水滑石（HT）、第三水合铝酸盐（TAH）和 C-A-S-H（少量）的结构；硫酸盐促进铝从 TAH（主要）和 C-A-S-H 迁移到单硫铝酸盐和钙矾石，但对 HT 中的铝几乎没有影响。虽然 Al ₂ O ₃FA 中的含量显着高于 GGBFS，FA 浆料中形成的含铝产物的含量低于 GGBFS 浆料中的含量。在成型的含铝产品中，Al(VI)的含量明显高于Al(IV)。GGBFS 浆料的 Al(VI)/Al(IV) 比值显着高于 FA 浆料，并且随着硫酸盐浓度的增加而增加。