Change of Dynamic Stiffness of Open and Closed Cell Resilient Materials after Compressibility Test

Abstract

Floating floors are one of the most effective constructions used for impact sound insulation assurance in dwellings. Resilient material between upper layer and the base of the floor are the main element reducing transmission of vibrations through the floor to the adjacent room. Dynamic stiffness and compressibility of resilient materials are the main descriptors characterizing its applicability for impact sound insulation. The change of dynamic stiffness of open and closed cell resilient materials after compressibility test was examined in this research. Stone and glass wool (open cell material) and elastic polystyrene (closed cell material) were tested. The research showed that dynamic stiffness after compressibility test decrease by about 40 % and about 30 % for mineral wool and elastic polystyrene accordingly in comparison with the values before test. Also the research showed that the difference between dynamic stiffness values of the wool and polystyrene after compressibility test decreased. The deference between dynamic stiffness values before compressibility test lied in the range of 20 % – 50 % and after compressibility test only 5 % – 10 % respectively.