- Palash Badjatya Columbia University ,
- Abdullah Akca Columbia University & Yildiz Technical University ,
- Daniela Fraga Alvarez Columbia University ,
- Baoqi Chang Columbia University ,
- Siwei Ma Columbia University ,
- Xueqi Pang Columbia University ,
- Emily Wang Columbia University ,
- Quinten van Hinsberg Columbia University ,
- Daniel Esposito Columbia University ,
- Shiho Kawashima Columbia University
This study describes and demonstrates a carbon-negative process for manufacturing cement from widely abundant seawater-derived magnesium (Mg) feedstocks. In contrast to conventional Portland cement, which starts with carbon-containing limestone as the source material, the proposed process uses membrane-free electrolyzers to facilitate the conversion of carbon-free magnesium ions (Mg2+) in seawater into magnesium hydroxide (Mg(OH)2) precursors for the production of Mg-based cement. After a low-temperature carbonation curing step converts Mg(OH)2 into magnesium carbonates through reaction with carbon dioxide (CO2), the resulting Mg-based binders can exhibit compressive strength comparable to that achieved by Portland cement after curing for only two days. Although the proposed “cement-from-seawater” process requires similar energy use per ton of cement as existing processes, its potential to achieve a carbon-negative footprint makes it highly attractive to decarbonize one of the most carbon intensive industries.
-References 49-61 were accidentally left off of the bibliography of the original manuscript but are not included. -Minor formatting issues to ensure consistent font / font size were also made to both the main article and ESI.