Geopolymer concrete can cut CO2 emissions by up to 80 percent compared with Ordinary Portland Cement, according to a review of international research. The binder uses alkaline activation of aluminosilicate materials like fly ash, blast furnace slag, metakaolin, and agricultural ash instead of high-temperature limestone calcination. Heat-cured mixes can pass 60 MPa compressive strength, and the material shows strong resistance to acids, sulfates, and marine chlorides. The actual carbon savings depend on precursor sourcing, activator type, and transport distances, since sodium silicate production is energy-intensive. Researchers also flag challenges around variable fly ash and slag quality, declining fly ash supply in some regions, and missing standardized testing and design codes. The paper points to one-part dry mixes and machine-learning mix optimization as ways to move geopolymer concrete into mainstream construction.
