Portland cement can be replaced or supplemented with finely divided materials known as “alternative cementitious materials.” Concrete’s technical properties and/or cost are improved and decreased due to their utilization. Fly ash, ground granulated blast furnace slag, condensed silica fume, limestone dust, cement kiln dust, and natural or manufactured pozzolans are a few examples of these materials. The cement industry is boosting the manufacturing of blended portland cement using industrial by-products, including blast-furnace slags and coal combustion fly ashes, to reduce CO2 emissions. Even though burning fossil fuels is responsible for most CO2 emissions, this only accounts for 50% of the cement industry. The other 50% cannot be eliminated by improving efficiency or switching to alternative energy sources because it is inherent in the chemical reaction that yields calcium carbonate (CaCO3), the main ingredient in cement. Because of this, no cement can be made without releasing carbon dioxide into the atmosphere. As a result, efforts to decarbonize cement manufacturing focus on capturing CO2 rather than reducing the quantity of CO2 in concrete mixtures. However, the high-quality byproducts are few, which calls for an alternative.