This study investigates the role of metakaolin-based internal conditioning (MIC) in mitigating alkali-silica reaction (ASR) by monitoring volume expansion, cracking, permeability, strength, and microstructure of mortar containing reactive aggregates. Comprehensive insights into the mitigation mechanisms were obtained by elucidating the silica dissolution of aggregate and property evaluations of ASR gels with varying compositions. Substantial decreases in ASR expansion and cracking density up to 80.2 % and 73.5 %, respectively, revealed the robust role of MIC in ASR suppression outperforming single uses of metakaolin or lithium. A synergistic effect in suppressing multiple prerequisites of ASR was observed from the co-existing MIC and lithium, which was explained by the complementary efficiency between lithium and aluminum in suppressing silica dissolution, 55.7 % lower water uptake and 87.3 % less swelling potential of ASR gel, as well as the conversion of expansive ASR (Q³) gel into non-expansive C-S-H (Q²) phase making it a promising approach in designing durable concrete.

本研究通过监测含有反应性骨料的砂浆的体积膨胀、开裂、渗透性、强度和微观结构，研究了偏高岭土基内部调节 (MIC) 在缓解碱-二氧化硅反应 (ASR) 中的作用。通过阐明聚集体的二氧化硅溶解和具有不同成分的 ASR 凝胶的性能评估，获得了对缓解机制的全面了解。ASR 膨胀和开裂密度的显着降低分别高达 80.2 % 和 73.5 %，这表明 MIC 在 ASR 抑制方面的强大作用优于偏高岭土或锂的单一用途。从共存的 MIC 和锂观察到抑制 ASR 的多个先决条件的协同效应，³ ) 凝胶成非膨胀 CSH (Q ² ) 相，使其成为设计耐用混凝土的有前途的方法。