The share of intellectual work has continously increased in the last decades. Whether in offices, in schools or communication rooms, the optimization of the boundary conditions in work and living rooms is a fundamental condition to preserve and increase performance and motivation. Thus, due to a shortage of space and area, optimized building products serving a multitude of aims are attractive innovations, one of which is the multi-functional concrete ceiling of the Fraunhofer IBP.
Thermally active concrete ceilings for example can regulate the indoor climate in summertime heat in a energy-efficient way. A suspended ceiling, however, used as room acoustical attenuation so far, can no longer be applied due to its insulation effect. Therefore, another solution for essential room acoustics must be found, i. e. thermally neutral and acoustically active solutions are required.
So-called gratings are well-known in physics for their specific effects. They can also be used to solve this acoustic problem by integrating periodic strips made of sound-absorbing material flush with the concrete ceiling. The porous recycling glass REAPOR®, was selected as appropriate material, where by means of sintering a pressure-resistant combination of the surface-porous glass beads is achieved. The strips are integrated in the ceiling by profiles already during lagging, which simultaneously serve to position reinforcement and piping. Finally, ceiling and absorber strips can be plastered resulting in good room acoustic due to sound absorption without any joints. Since the strips occupy only a small surface area, there is only a minor influence on the thermal effect of the ceiling. This integration of thermal and acoustic functionality in theory and practice is also offering scope to design to combine modern architecture and performance-enhancing room climatic conditions.