Abstract In this work we studied two samples of triclinic C3S. Namely pure triclinic C3S with no addition of foreign ions and triclinic C3S doped with 0.5 wt.-% Al2O3 to investigate the influence of aluminium on the hydration of C3S in the first 24 h and additionally the effect of KOH solution. During hydration Al-doped C3S shows lower reaction rates in the acceleration period compared to pure C3S. Al ions lead to precipitation of C-A-S-H phase and reduces the overall reactive surface area of C-S-H. Furthermore, Al ions in solution decrease the supersaturation of C-S-H during hydration and therefore the precipitation rates are lower for the Al-doped C3S. The addition of KOH solution leads to a general acceleration of reaction for both C3S samples, but at a concentration of 0.3 mol/L KOH both samples show comparable reaction rates during the main hydration event and the effect of Al is reversed.

中文翻译：

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铝对加入KOH溶液的三斜C3S水合反应的影响

摘要 在这项工作中，我们研究了两个三斜 C3S 样品。即未添加外来离子的纯三斜 C3S 和掺杂 0.5 wt.-% Al2O3 的三斜 C3S，以研究铝在前 24 小时内对 C3S 水合的影响以及 KOH 溶液的影响。在水合过程中，与纯 C3S 相比，Al 掺杂的 C3S 在加速期间显示出较低的反应速率。Al 离子导致 CASH 相沉淀并降低 CSH 的整体反应表面积。此外，溶液中的铝离子降低了水化过程中 CSH 的过饱和度，因此掺杂铝的 C3S 的沉淀速率较低。加入 KOH 溶液会导致两种 C3S 样品的反应普遍加速，但浓度为 0。