Metakaolin-based geopolymer beads: Production methods and characterization

The production of porous metakaolin-based geopolymer beads was investigated using three different dripping based techniques. The processes were based on the formulation of geopolymer slurries produced using metakaolin and a potassium-disilicate activating solution, and exploiting injection and solidification method in polyethylene glycol (PEG) or liquid nitrogen and ionotropic gelation of alginate in calcium chloride. Geopolymer slurries and...