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采用低活性高硅尾矿预处理后作为硅铝原料(基质)与铝校正料偏高岭土复合,在碱硅酸盐溶液激发作用下制备地聚合物。通过ESEM和ATR-FTIR表征地聚合物净浆的早期水化反应机理,并对地聚合物砂浆试样后期的抗压强度及微观形貌进一步分析。结果表明:通过碱熔融与机械研磨复合的方式对尾矿进行预处理,可以有效促进地聚合物体系的早期水化反应进程,有利于铝硅酸盐凝胶相的形成,进而改善地聚合物后期的微结构及强度性能。本研究说明有可能通过改变硅铝原料性质的方式对地聚合物早期水化反应行为进行控制,从而调整地聚合物的后期性能(如强度性能、施工性能等),使其满足特定的工程应用需求。
Using low active high silicon tailings pretreatment as silicon and aluminum raw materials (matrix) and the aluminum correction material metakaolin compound, alkaline silicate solution prepared under the excitation of the polymer. The early hydration reaction mechanism of polymer paste was characterized by ESEM and ATR-FTIR. The compressive strength and microstructure of polymer mortar were further analyzed. The results show that pretreatment of the tailings by means of alkali fusion and mechanical grinding can effectively promote the early hydration reaction of the geopolymer system, which is in favor of the formation of the aluminosilicate gel phase and further improve the mechanical properties of the geopolymer Late microstructure and strength properties. This study shows that it is possible to control the early hydration reaction behavior of geopolymer by changing the properties of silica-alumina raw materials, so as to adjust the late properties of geopolymer (such as strength properties, construction performance, etc.) to meet specific engineering applications demand.