During the project funded by the German Research Foundation (DFG) for the development of sandwich elements with thin surface layers of carbon concrete, the first of four test specimens was successfully produced in the last few weeks.
Despite the current circumstances, the 8.2 m long specimen could be concreted and prestressed with strands of carbon fibre plastic (CFRP). The two concrete layers required for the sandwich element were not produced horizontal, instead they were standing upright on the long side. This enabled the simultaneous production of the two layers and reduced the amount of further work. After the concrete hardened and the prestressing force had been induced, the insulating material was set between the two concrete layers. In this case, a polyurethane insulation material was used, which was mixed out of two components. The mixture was filled into the now completely closed formwork via four holes, so that the foam could expand and harden between the two pretensioned carbon concrete shells.
This project shows that high-performance materials can be used to produce thin construction elements with a high surface quality.
During this time we were once again able to rely on our dedicated team, which makes the implementation of such demanding projects possible. At this point: Thanks for your support!
(Article: A. von der Heid)