With the implementation of the new Danish building code from 2010, the acoustical requirements for deckshas increased dramatically. The result is a large increase in the mass of hollow-core slabs to 440 kg/m2. The consequences for the deck constructions will be very serious as the inevitable result is large extra costs for hollow-core slabs.
The SL-Deck has been designed according to the new acoustical requirements which means that a 289 kg/m2 SL-Deck lives up to the new requirements without any other insulation. Since sound is a logarithmic scale this corresponds to an acoustical insulation for the SL-Deck which is twice as good as that of hollow-core slabs.
The reason for the superior acoustical properties is the design of the SL-Deck. Hence, the strong concrete constitutes a series of vaults over the curved light-aggregate blocks. Since a vault is stiffer than a plane plate, the eigenfrequency of it is higher, which is beneficial because the most difficult frequencies to make sound insulation for are in the low end of the spectrum. Furthermore, the strong concrete and the light aggregate concrete have different eigenfrequencies resulting in an internal damping of energy from sound.
Click play on the video below to see the sound test of the SL-Deck. (Unfortunately only in Danish)