Research Development on Mechanism of Fly Ash-based Geopolymer and Effect of Each Component

Geopolymer is a kind of inorganic polymer cementitious materials,which has a 3D network of silico-aluminate structures.Geopolymer can be synthesized from calcined clays,industrial waste or other alumino-silicate containing source materials under strongly alkaline conditions.Compared with organic polymers,cements,ceramics and metals,geopolymer has superior performances.Recently,geopolymer has become a research focus in the green cementitious materials field.Current status of the researches on the reaction mechanism of fly ash-based geopolymer are reviewed.The Glukhovsky model,the descriptive model,the nanostructural model and the volumetric model are introduced,and emphasis is placed on the effect of alkali,aluminum,silica,calcium and water on geopolymerization.