Geopolymer is an inorganic alumino-silicate polymer, blended from mainly silicon and aluminum material, for example, fly ash. Alkaline solutions are utilized, to instigate the silicon and aluminum atoms; in the source materials (fly ash), to disintegrate to form a gel. The polymerization procedure might be helped by applied heat, followed by drying. The Geopolymer gel ties the free coarse and fine aggregates to shape geopolymer concrete. Geopolymer gel supplants the C–S–H gel in concrete cement. The concoction response period is generously quick, and the necessary relieving period might be inside 24 to 48 hours.
It is manufactured by the implementation of waste materials like fly ash and GGBS (Ground Granulated Blast furnace Slag). Fly ash and GGBS are processed before being used in the form of geopolymer concrete in concrete works.
The main constituents of geopolymer concrete include fly ash (GGBS), a combination of fine and coarse aggregates also an alkaline activator solution.
Geopolymer concrete has an outstanding compressive strength of 70 MPa (N/mm2)
It produces less drying shrinkage and low heat of hydration as compared to cement concrete. It is also more acid-resistant.