Vinci Construction Terrassement is installing ultra-low-carbon acoustic screens on the A10 in Saint-Avertin (37)

A main link between Paris and Bordeaux, the A10 is the longest motorway in France with 557 km in length. The installation of ultra-low-carbon acoustic screens along the edge of the town of Saint-Avertin, south of Tours, completes the existing screens at the Sagerie. These screens meet the sound protection objectives for the residents of rue des Fontaines and rue de Grand Cour, as well as a strong objective of limiting the carbon footprint set by VINCI Autoroutes.

This common desire to reduce the carbon footprint of our works is illustrated in this synergy between VINCI Autoroutes and VINCI Construction to decarbonize the concrete material and move towards the 90% use of low-carbon concrete announced by the VINCI group as an ambition. for 2030.

During the preparation phase, VINCI Construction Terrassement thus mobilized a set of resources and suppliers meeting this requirement, not only for the concrete but also for all the project materials: the mobilization of local suppliers for the reinforcement, the posts and the stringers ; systematic use of recycled materials for temporary fittings; the use for the prefabrication of low-carbon concrete stringers; and the mix of wood/concrete materials for ultra-low carbon acoustic screens.

The work to fit out the absorbent screens over 280 linear meters began on March 23, 2022 for a period of 4 months and for an amount of 500 euros. In particular, they cover the manufacture and installation of 000 ultra-low carbon acoustic panels 60 meters wide and 5 meters high, in partnership with the company CAPREMIB, which has been working for several years to reduce the carbon footprint of its activity, by using new concrete compositions and by replacing traditional cements with alternative binders.

CAPREMIB has thus developed with Hoffmann Green Cement Technologies an innovative solution combining ultra low carbon structural concrete and absorbent wood concrete panels based on Hoffmann Green solution cements which makes it possible to divide by 3 the carbon footprint of the whole of the work, i.e. a saving of nearly 4 tons of CO2 on the wood concrete screens station.

The solution thus implemented by the Agence Lyonnaise de Travaux d'Écrans Acoustiques (ALTEA) of VINCI Construction Terrassement is fully integrated into VINCI Construction's EXEGY® approach, which consists of generalising low-carbon concretes based on a precaster like CAPREMIB and carbon-free binder suppliers like Hoffmann Green to optimize the technical and environmental performance of the concrete used with the aim of remaining competitively priced.

Clement BLANC, CAPREMIB: “The marriage of wood, H-UKR cement from Hoffman Green, and EXEGY® solutions is found through a product that protects residents from noise pollution. These alliances are relevant and make it possible to imagine all the solutions for a future in carbon-free concrete, while preserving the intrinsic and durability properties of the structures. »

David GUGLIELMETTI, Hoffmann Green: “The use of Hoffmann Green cements, 0% clinker, cold-manufactured from industrial co-products makes it possible to divide CO2 emissions by four compared to traditional cement. It is therefore a strong signal sent to the world of construction because it is now possible to do without cement. We share the same observation with VINCI Construction on the need to decarbonize concrete and we thank them for involving us in this project. »

Florian CHARTIER, Lyon Acoustic Screen Works Agency, VINCI Construction Terrassement: “We worked in the preparation phase with CAPREMIB and the EXEGY® teams to offer VINCI Autoroutes a solution that complied with the framework of the specifications, which combines acoustic performance and environmental performance. It is important for us to integrate this low-carbon performance into our projects, which drives us to reinvent ourselves. »

Bruno PAUL-DAUPHIN, EXEGY® Director: “After an initial experiment with EXEGY® ultra-low carbon jacking pipes with BESSAC, CAPREMIB has once again demonstrated its ability to innovate in order to reduce carbon. This 280 linear meter structure presents a range of low-carbon solutions available, one of which notably mixes concrete and wood. It is by working in this spirit of partnership at the service of our customers upstream of construction sites that we will be able to make concrete a material of the future. »