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针对水泥-高掺量矿渣胶凝材料早期强度发展缓慢的现象,自行设计开发了一种用于激发矿渣早期水化活性的复合活化剂,对比研究了复合活化剂与纯硫酸盐对水泥-矿渣胶凝材料性能以及水化机理的影响。结果表明:复合活化剂与纯硫酸盐均能在水化1 d内提高水泥熟料和矿渣的反应程度,促进矿渣产物形态提前由外部水化产物向内部水化产物过渡,提升胶凝材料早期宏观性能;然而使用纯硫酸盐激发的胶凝材料后期性能下降,可能是由于生成过量钙矾石所造成;复合活化剂则通过促进水泥熟料水化、加速矿渣溶解、反应以及改善微观结构性能等提高胶凝材料早期强度提升,对后期性能无副作用。
Aiming at the slow development of early strength of cement - high volume slag cementitious material, a kind of composite activator for activating early hydration activity of slag was designed and developed. The effect of composite activator and pure sulfate on cement - slag Effect of Cementitious Materials and Hydration Mechanism. The results show that both the composite activator and the pure sulfate can increase the reaction degree of cement clinker and slag within 1 d of hydration and promote the transition of the slag product form from the external hydration product to the internal hydration product and the early gelation of the cementitious material However, the performance degradation of pure sulfate-activated cementitious composites may be attributed to the excessive formation of ettringite, and the composite activators accelerate the hydration of cement clinker, accelerate the slag dissolution and reaction, and improve the microstructural properties Improve the early strength of cementitious materials to enhance the performance of the late side effects.