The innovative material carbon concrete is used for the reconstruction of the Rheinsteg near Albbruck. The reinforced concrete slab of the 200 m long foot and cycle path bridge from the 1930s on the border between Germany and Switzerland showed severe corrosion damage and had to be demolished. As a replacement, a carbon concrete slab of similar thickness will be installed without any additional coating, so that the tare weight of the structure will not increase and the existing colummns and steel beams in the main load-bearing direction can continue to be used after a basic renovation. The Institute of Structural Concrete of the RWTH Aachen University carried out experimental and theoretical investigations on behalf of the company solidian GmbH and the client, the Rheinkraftwerk Albbruck-Dogern AG, to prove the load-bearing capacity of the slab. On the basis of the expert opinion, it was possible to obtain approval in advance in individual cases with project-related design authorisation for the use of carbon concrete. The focus here was on the effect of restrained stressed forces with simultaneous transverse force loading.
Last week, the first concreting was carried out under demanding conditions on site by the executing company Erne AG Bauunternehmung. The project demonstrates the potential of this innovative material for large-scale applications.
Involved in the partial performance of carbon concrete:
Bauherr: Rheinkraftwerk Albbruck-Dogern AG (Schluchseewerk AG)
Planer: Weiß Beratende Ingenieure GmbH
Gutachterliche Stellungnahme: Institut für Massivbau der RWTH Aachen
Zustimmungsbehörde: Landesstelle für Bautechnik im Regierungspräsidium Tübingen
Prüfstatik: RECK+GASS Ingenieurgesellschaft für Bauwesen mbH + Co. KG
Bewehrung: solidian GmbH
Beton: Transportbeton Hochrein GmbH
Ausführung: Erne AG Bauunternehmung
Contribution by J.Bielak