shows SEM micrographs of typical fracture surfaces of geopolymer pellets samples without added polymers (panel a) as well as samples of the same geopolymer composition with polymers incorporated (panels b–f). The geopolymer sol–gel reaction allows pellets of any size and shape to be synthesized. When mixing the pre-heated kaolinite in the alkaline waterglass, the kaolinite is dissolved, forming reactive Si- and Al-species that