Abstract This study aimed to accelerate the reaction kinetics and improve the performance of Na2CO3-activated ground granulated blast-furnace slag (GGBS) via the use of reactive MgO and hydromagnesite seeds. The effect of 3–10% MgO and 0.5–1% seeds on the reaction mechanisms of Na2CO3-activated pastes was evaluated by pH, isothermal calorimetry and setting time measurements. Compressive strength results were used to assess the mechanical performance of the Na2CO3-activated GGBS concrete. A thorough investigation involving XRD, TG-DTG, and 29Si and 27Al solid-state NMR was performed to investigate the evolution of different phases. The inclusion of MgO and seeds promoted the removal of CO32−, increasing the pH and accelerating the dissolution of GGBS. The improved reaction kinetics via the use of MgO and seeds led to samples with shortened setting times, increased hydration and enhanced performance (43 vs. 14 MPa at 28 days) when compared to the control sample.

中文翻译：

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加速反应动力学并提高 Na2CO3 活化的 GGBS 混合物的性能

摘要 本研究旨在通过使用反应性 MgO 和水菱镁矿种子加速反应动力学并提高 Na2CO3 活化的地面颗粒状高炉矿渣 (GGBS) 的性能。3-10% MgO 和 0.5-1% 种子对 Na2CO3 活化糊剂的反应机制的影响通过 pH、等温量热法和凝固时间测量进行评估。抗压强度结果用于评估 Na2CO3 活化的 GGBS 混凝土的机械性能。进行了涉及 XRD、TG-DTG 以及 29Si 和 27Al 固态 NMR 的彻底研究，以研究不同相的演变。MgO 和种子的加入促进了 CO32− 的去除，提高了 pH 值并加速了 GGBS 的溶解。