In this work, lithium slag based geopolymer (LSG) mortar with excellent properties was successfully produced by a strategy of pre-calcination at room temperature curing. Which eliminated the limits of application scenarios of geopolymer acquired elevating curing temperature. Meanwhile, the setting controlling of LSG was investigated by adjusting activator and addition of sodium tetraborate as a retarder. Lowering modulus and dosage of activator could prolong the setting time. However, solubility of sodium silicate limited the minimum modulus of activator although lower modulus favored the early strength development and lowered drying shrinkage. Decreasing alkali dosage was detrimental to strength development and exacerbated efflorescence. The pre-addition of sodium tetraborate to activator led the formation of ^[4]B–O–Si bonding which later modified by [AlO₄]^- tetrahedral and translated to ^[3]B–O–Al–O–Si bonding, as a consequence, retarding the condensation reaction and prolonging setting time. Although addition of sodium tetraborate comprised a little mechanical strength, it improved the rheological characters of LSG and was meaningful in some cases which strength not strictly acquired. Additionally, water retaining of borate also lowered drying shrinkage of LSG mortar. At controlling dosage (≤5%), sodium tetraborate not only could be used as retarders but also a useful water-retainer.

在这项工作中，通过室温固化的预煅烧策略成功生产了具有优异性能的锂渣基地质聚合物（LSG）砂浆。消除了提高固化温度的地聚合物的应用场景的限制。同时，通过调节活化剂并加入四硼酸钠作为缓凝剂来研究LSG的凝结控制。降低模量和活化剂用量可延长凝固时间。然而，硅酸钠的溶解度限制了活化剂的最小模量，尽管较低的模量有利于早期强度的发展并降低了干燥收缩率。减少碱用量对强度发展和加剧风化是有害的。将四硼酸钠预先添加到活化剂中导致^[4]的形成B-O-Si键后来被[AlO ₄ ] ^-四面体修饰，并转化为^[3] B-O-Al-O-Si键，因此，阻碍了缩合反应并延长了固化时间。尽管加入四硼酸钠的机械强度很小，但它改善了LSG的流变特性，在某些强度没有严格获得的情况下是有意义的。此外，硼酸盐的保水还降低了LSG砂浆的干燥收缩率。在控制剂量（≤5％）下，四硼酸钠不仅可用作缓凝剂，而且可用作有用的保水剂。