硅铝原料预处理对地聚合物早期水化反应行为的影响

发布时间：2018-07-16 15:46

【摘要】：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。
[Abstract]:Low activity high silicon tailings were used as raw material (matrix) and aluminum correction material (metakaolin) to prepare geopolymers under the excitation of alkaline silicate solution. The mechanism of early hydration of geopolymer mortar was characterized by ESEM and ATR-FTIR. The compressive strength and microstructure of the mortar were further analyzed. The results show that pretreatment of tailings by alkali melting and mechanical grinding can effectively promote the early hydration process of geopolymers and facilitate the formation of aluminosilicate gel phase. Then the microstructures and strength properties of geopolymers were improved. This study shows that it is possible to control the early hydration behavior of geopolymers by changing the properties of silica-aluminum raw materials, so as to adjust the later properties of geopolymers, such as strength properties. Construction performance, etc.) to meet the specific needs of engineering applications.
【作者单位】：江西理工大学江西省矿业工程重点实验室;江西理工大学工程研究院;江西理工大学资源与环境工程学院;
【基金】：国家自然科学基金(51304085) 江西理工大学校级自选课题(NSFJ2014-K01);江西理工大学博士启动基金项目(3401223152) 江西省教育厅科技项目(GJJ14426) 江西省自然科学基金资助项目(20142BAB216008) 江西省科技支撑计划项目(20151BBG70015)
【分类号】：TU52

【参考文献】