Can a Stanford University professor take concrete from one of the world’s largest carbon dioxide emitters into an important tool for reducing power plant emissions?
Brent Constantz, also founder and CEO of Blue Planet, shared his vision in this video.
He spoke at the BuildWell conference
Constantz is focusing on a very different type of cement: a calcium carbonate cement. The calcium is derived either from seawater or — in more inland locations — from brine, and the carbonate comes from the carbon dioxide in power plant flue gases. He envisions a system in which the CO2 is extracted from flue gases to produce both a calcium carbonate cement and limestone aggregate.
Blue Planet, which has attracted some large investors, believes that concrete produced with their CarbonMix cement and limestone aggregate would be carbon-neutral or even carbon-negative, meaning that the more of it you use the more carbon is sequestered — or pulled out of the atmosphere and forever locked up.
Blue Planet is carrying out research at one of California’s largest power plants: a natural-gas-fired plant on the coast at Moss Landing (south of San Francisco). The Moss Landing power plant, now owned by Dynegy, produces four million tons of CO2 per year — CO2 that is contributing to global warming.