Seawater and CO2 may unlock a game-changing new concrete technology
Summary
A new material made of seawater, carbon dioxide, and electricity could give the construction industry a much-needed climate upgrade. Developed by researchers at Northwestern University, the paste-like substance offers a dual solution: a substitute for mined sand and a way to produce carbon-capturing concrete. Making it releases huge amounts of carbon dioxide and relies heavily on sand dredged from coasts and riverbeds, a practice that can cause serious environmental damage. Cement plants near coastlines could draw seawater directly into on-site reactors, transforming waste CO₂ into useful, solid building materials. However, carbon-capturing concrete made from abundant and inexpensive ingredients could offer a rare combination of feasibility and climate benefits.