LAUSR

Abstract As with all industrial processes, concrete production comes with environmental costs that are proportionate to its use. As such, approximately 8% of all, global carbon dioxide (CO2) emissions are related to cement and concrete. Combining new technology with the mass production of concrete offers one of the few feasible pathways to improve global air quality by reducing concentrations of CO2 and other airborne pollutants. Carbonation of concrete waste and concrete blocks not only improves the performance of these products, the transformation of calcium or magnesium-rich minerals into thermochemically stable carbonates also offers a path to sequestering CO2 on a large scale, creating products with commercial value. Carbonation seems to have the largest potential to reduce concrete-related emissions of CO2 of any current technology and offers the potential of carbon negative concretes, thereby harnessing the potential of the cement industry and turning it into the world's greatest carbon sink rather than its largest CO2 emitter.