Abstract The effects of varying Li2CO3 additions on the hydration kinetics of a ternary CSA-OPC-anhydrite system were investigated. The presence of Li led to increased ye'elimite and C3S dissolution as well as accelerated ettringite precipitation. Excessive additions however resulted in heavily decreased ye'elimite dissolution and hydration kinetics after the initial period as evidenced by heat-flow-calorimetry and in-situ XRD. Pore solution analysis showed that the decreased ye'elimite dissolution can be linked to remarkably high Ca/Al-ratios which correspond to the induction period in CSA based systems combined with retarding agents. The early precipitated silicon incorporating hydrate phase in these systems is either straetlingite or a zeolitic phase. The high Li-addition led to a dissolution of these phases in favor of C-S-H precipitation. Consequently, the formed hydrate phase assemblage was changed from ettringite, AH3 and straetlingite or Ca-zeolite in the reference and low Li2CO3 system to ettringite and C-S-H precipitation in the highly dosed Li system.

中文翻译：

---

不同 Li2CO3 添加量对三元 CSA-OPC-硬石膏混合物水合的影响

摘要 研究了不同的 Li2CO3 添加量对三元 CSA-OPC-硬石膏系统水合动力学的影响。Li 的存在导致 ye'elimite 和 C3S 溶解增加以及钙矾石沉淀加速。然而，如热流量热法和原位 XRD 所证明的那样，过量添加会导致初始阶段后 ye'elimite 的溶解和水合动力学严重下降。孔溶液分析表明，降低的 ye'elimite 溶解可能与非常高的 Ca/Al 比值有关，这对应于基于 CSA 的系统中与缓凝剂结合的诱导期。在这些系统中，早期沉淀的硅水合物相要么是菱镁矿相，要么是沸石相。高锂添加导致这些相溶解，有利于 CSH 沉淀。因此，所形成的水合物相组合从参比和低 Li2CO3 体系中的钙矾石、AH3 和菱钙石或钙沸石转变为高剂量锂体系中的钙矾石和 CSH 沉淀。