The LaVallée eco-district, demonstrator of sustainable living in Chatenay Malabry (France) located on the former site of the Central School, offers the opportunity to Eiffage to experiment an innovation with a large-scale: the recarbonation of concrete.
 
The deconstruction of all buildings on the site makes it possible to benefit from a stock of recycled aggregates in order to deploy this first in France. 100% of the aggregates will be reintroduced on the site intended for the roads but also largely for the building concretes. Some of the aggregates will be used to experiment, thanks to IFSTTAR researchers, the re-carbonation.
 
This technique involves introducing CO2 under pressure in the aggregates from the deconstruction. Thus, for 1 ton of recycled concrete we capture between 75 and 150 kg of CO2 and save the extraction of 650 kg of aggregates from quarry.
 

This experiment resonates with the ambition of the Eiffage group to develop its low carbon offer.