Alkali-silica reaction (ASR) is a significant cause of the degradation of concrete structures. ASR results from the dissolution of reactive silicate aggregates and the subsequent formation of damaging, expansive ASR gels. Despite the prevalence of ASR, so far only lithium-based chemical admixtures have been shown to be successful in mitigating its deleterious effects. Herein, dissolved calcium nitrate (Ca(NO₃)₂: CN) is demonstrated to reduce ASR-induced expansion caused by the use of sodium borosilicate (NBS) glass as a model reactive aggregate. The significance of reductions of NBS-glass dissolution and mortar-bar expansion rates is discussed, with special focus on highlighting the mechanism by which calcium nitrate mitigates ASR, i.e., by the inhibition of aggregate dissolution. This study reveals a new and cost-effective pathway to suppress aggregate dissolution and ASR in concrete based on the dosage of soluble alkaline-earth additives.

碱硅石反应（ASR）是混凝土结构退化的重要原因。ASR是由于反应性硅酸盐聚集体的溶解以及随后形成破坏性的膨胀ASR凝胶而产生的。尽管ASR盛行，但到目前为止，仅锂基化学外加剂已显示出成功减轻其有害作用的能力。在此，溶解的硝酸钙（Ca（NO ₃）₂：CN）被证明可以减少ASR诱导的膨胀，该膨胀是由于使用硼硅酸钠（NBS）玻璃作为模型反应性聚集体而引起的。讨论了降低NBS玻璃溶解和砂浆棒膨胀速率的重要性，并特别着重于强调硝酸钙缓解ASR的机制，即通过抑制骨料溶解。这项研究揭示了一种基于可溶性碱土添加剂的用量而抑制混凝土中骨料溶解和ASR的经济有效途径。