Durability of inorganic foam in solution: The role of alkali elements in the geopolymer network

► Investigations of geopolymer stability is a key point to define their application. ► The addition of silica fume to a geopolymer mixture lead to foam. ► The final products and their microstructure depend on the alkaline cation. ► Durability tests revealed the composition of geopolymer foam network. ► Zeolite phase is responsible for the degradation of the potassium foam.