碱激发碳酸盐矿-矿渣复合作用及机理的研究

采用无活性的锆英石分别等体积替代碱激发碳酸盐矿-矿渣胶凝材料（AACSCM）中的碳酸盐矿和矿渣，通过胶砂强度试验考察了在AACSCM材料中碳酸盐矿与矿渣的复合作用，进而通过净浆硬化体的孔溶液成分分析研究了其复合作用机理。结果表明：在硅酸钠溶液碳酸盐矿-矿渣体系反应的后期，矿渣、碳酸盐矿与硅酸钠溶液之间具有显著的协同效应。其机理是：在反应后期，由矿渣自身解体提供的Ca^2＋、Mg^2＋等的数量已不足，而Al^3＋则有较多剩余，此时，碳酸盐矿的溶解提供了所需的Ca^2＋和Mg^2＋，促进了矿渣进一步解体，而矿渣解体需要更多的（Ca^2＋和Mg^2＋，反过来又加速了碳酸盐矿的溶解，如此反复，使得整个体系的反应程度有较大提高，材料的强度和抗渗性能等得到显著改善。

Synergistic Effect and Mechanism of Ground Carbonatite and Slag in Alkali-activated Carbonatite-slag Cementitious Material

Mortar specimens of alkali-activated carbonatite-slag cementitious materials(AACSCM) were prepared,in which finely ground zirconite,being inactive under the reaction condition of this experiment,was also used to replace ground carbonatite or ground granulated blast-furnace slag(GGBFS) by iso-volume,so as to investigate the contribution of each material to the strength of AACSCM.According to the test results of mortar strength and the composition of pore solution of pastes,the effect of GGBFS on the strength improvement of alkali-activated cementitious material(AACCM) was discussed.The results indicated that,at the late stage of reaction,there did exist a synergistic effect between GGBFS and ground carbonatite under the activation of alkaline.The mechanism lied in: during the late period of reaction,the amount of Ca2 ,Mg2 provided by GGBFS to the reaction system was much decreased,while much more Al3 were retained.The shortage of Ca2 ,Mg2 in the system was compensated by the dissolution of ground carbonated,leading the reaction be continued,and Al3 were consumed simultaneously in the reaction,which promoted the dissolution of GGBFS in return.With the repeat of this process the reaction degree of AACSCM was much improved.