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Green cement a step closer to being a game-changer for construction emissions

Green Cement


Producing Portland cement alone accounts for 5-8% of all global greenhouse emissions. MOC (magnesium oxychloride cement) is a more environmentally friendly cement but its poor water resistance has limited its use – until now. Some innovations could remove these limitations.

Perspectives and insights

  • If the cement industry were a country, it would be the third-largest emitter of CO2 in the world.
  • Many countries, including China and Australia, have plenty of magnesite resources, as well as seawater, from which both MgO and MgCl2 could be obtained. Furthermore, MgO can absorb CO2 from the atmosphere. This makes MOC a truly green, carbon-neutral cement.
  • A Sydney University team has developed a water-resistant MOC.
  • Corrosion of steel in MOC is still a critical issue to be overcome.