Researchers propose a novel method to produce cement using basalt instead of limestone, which could eliminate the direct CO2 emissions from traditional cement production. The process involves using acid to extract calcium from basalt and then processing it into cement, though it's currently only proven at lab scale. This approach could significantly reduce the 8% of global CO2 emissions currently attributed to cement production.
Background
Traditional Portland cement production involves heating limestone, which releases CO2 as a byproduct and accounts for about 8% of global CO2 emissions. The process is inherently carbon-intensive due to the chemical reaction that occurs when limestone is converted to lime.
- Source
- Ars Technica
- Published
- May 16, 2026 at 01:06 AM
- Score
- 7.0 / 10