France: Lafarge France, part of Holcim, will deploy the technology of the Swiss start-up Neustark on its Gennevilliers site. This means that around 1000t/yr of CO2 could be sequestered into recycled concrete.
Neustark’s principle consists of injecting the liquefied CO2 into recycled gravel. The gas then reacts with the calcium present and forms calcium carbonate crystals. It is thus transformed and can be stored indefinitely. Neustark has already deployed its technology at 22 sites in Europe, mainly in Switzerland and Germany.
The Gennevilliers plant already receives demolition concrete and transforms it into recycled aggregates used in ready-mix concrete gravel and road sub-bases. The site, which produces 80,000t/yr of recycled materials, will be able to transform around 1000t/yr of CO2, as Neustark's technology can store 10kg of CO2 per tonne of recycled demolished concrete.
