On Tuesday 23 April, at the request of VINCI Autoroutes, the first Exegy® low-carbon reinforced concrete barrier was poured at the Labenne site in south-west France.
The Exegy® formula was developed by teams from the Research Centre in Mérignac, in collaboration with teams from the VINCI Construction concrete laboratory in Marolles and with the help of the laboratory of the South-west Road France Technical Sub-Division in Toulouse.
This Exegy® concrete is based on an LC3 solution, which consists of substituting 50% of the cement with limestone filler and a locally produced calcined clay (metakaolin).
During this experimental phase, two formulas were implemented by the teams from EJL’s Toulouse office: a “traditional” concrete and the Exegy® formula.
The test run went perfectly. There was no impact on the pace or implementation, and no geometrical defects were found. The carbon footprint assessment shows a CO2 reduction of more than 30% compared with the traditional concrete.
The Centre de Recherche des métiers de la Route (road professions research centre) is currently following up on the project, with the aim of rolling out the solution in other regions. This achievement is the product of genuine group synergy between teams at VINCI Autoroutes and VINCI Construction (France Road Division) and lays the groundwork for future development of similar solutions.
