Researchers from the University of California propose replacing limestone with basalt in cement manufacturing. The Portland cement industry generates 4.4% of global CO2 emissions, similar to all the world's cars. Basalt, a calcium-rich rock that is easier to refine, could reduce the energy needed by up to 60% and CO2 emissions by 80%, according to a study in Nature.
How basalt improves cement production 🌍
The traditional process with limestone emits about 600 kg of CO2 per metric ton. With basalt silicates, the figure drops to about 50 kg per ton. The key is that basalt requires a lower firing temperature and releases less carbon during the chemical reaction. This not only reduces the environmental impact but also decreases energy consumption, a significant advancement for a material essential in global construction.
The cement that won't make you feel guilty about building 🏗️
Finally, a construction material that won't make you look askance at your own house. While traditional cement pollutes as if it had a diesel engine inside the kiln, basalt cement is almost a model student. Now we just need construction companies not to raise objections and for the price not to skyrocket like a hot air balloon. Because, let's be honest, cheap always ends up being expensive... or polluting.