Geopolymer is an alumina-silicate cementitious material, which can be synthesized by mixing source material (fly ash, metakaolin, slag, etc.) with a strong alkaline solution (combination of NaOH and Na₂SiO₃). Geopolymers have attracted recent attention as they possesses excellent acid resistant characteristics, show higher mechanical strength and durability, demonstrate lower permeability, experience little shrinkage, have lower production cost, and possess higher pumpability compared to ordinary Portland cement. In this research seminar, based on presenter's expertise, application of geopolymers in the following three areas will be presented: (i) Blended fly ash - rice husk ash geopolymers, (ii) Flow and mechanical behaviour of geopolymer based well cementing for carbon capture and storage wells and (iii) Geopolymers as soil stabilizers.