两种土壤聚合物碱激发剂的激发效果对比

采用大液固比的方法对比研究了氢氧化钠和硅酸钠溶液对偏高岭石的激发作用,将反应到一定时间的浆体进行分离,对分离后的溶液和粉体分别进行分析.研究结果表明:(1)随反应时间的延长,偏高岭土与硅酸钠溶液反应分离后溶液中Si的聚合度增加,溶解的Al单体与溶液中的硅酸根离子聚合,分离后的粉体既有被碱侵蚀后的硅氧的碎片,也有铝单体与硅酸根离子聚合的胶团;(2)随反应时间的延长,偏高岭土与氢氧化钠溶液反应分离后溶液中的Si和Al含量不断增多,但硅和铝没有发生聚合,分离后粉体仅是偏高岭石在碱侵蚀下生成的碎片;(3)硅酸钠溶液中的硅酸根离子对土聚反应起到了重要的作用.

Contrastive Investigation into Activated Effects of Two Alkali-Activators on Geopolymers

The activated effects of two kinds of alkali-activators,namely,sodium hydroxide solution and sodium sili-cate solution,on metakaolinite were investigated using the large solid-liquid ratio method.In the investigation,the slurry was separated after a period of activation,and the separated solutions and powders were then analyzed,respectively.It is found that(1) in the separated solution after the reaction between sodium silicate solution and metakaolin,the polymerization degree of Si increases with the reaction time,the soluble Al polymerizes with the siliceous ion,and the separated powder contains both the fragment of metakaolinite and the gel of silicate-aluminium;(2) in the separated solution after the reaction between sodium hydroxide solution and metakaolin,the contents of Si and Al increase with the reaction time,the soluble Al does not polymerize with the siliceous ion,and the separated powder only contains the fragment of metakaolinite;and(3) the siliceous ion in sodium silicate solution plays a significant role in the geopolymeric reaction.