Taulhac viaduct: steel–concrete composite solution
The impressive Taulhac Viaduct is scheduled to open to traffic in January 2012. After erection of the steel deck structure, it has now entered its closing phase of concreting.
The Taulhac viaduct project on which construction work started in January 2010 is managed by a consortium made up of DV Construction (Bouygues) and Campenon Bernard Régions TP (Vinci Group) together with contractor Gagne. This new link in the RN88 highway will be the key component of the Puy en Velay bypass.
A steel–concrete composite solution was chosen for the 422-m-long, 20-m-wide structure. Vicat’s Béton Granulats du Centre batching plant in Le Monteil was chosen by the ready-mixed concrete consortium to supply the 7000 m3 of concrete necessary. Crushed aggregate produced from hard rock and Vicat cement from the Saint Égrève plant were used for the single design mix for the pile caps, hollow piers, and superstructure. The use of this particular cement which helps reduce exothermic reaction (temperature rise) meant the project owner’s and the engineer’s technical requirements were met.