Geopolymer concrete based on fly ash, that does not need Portland cement as a binder - a 100% cementless concrete. It relies on minimally processed natural materials or industrial byproducts to significantly reduce its carbon footprint, while also being very resistant to many of the durability issues that can plague conventional concrete. Comparing to Portland cement, the production of geopolymers has a relative higher strength, excellent volume stability, better durability and promisingly green.