The Effect of Artificial Lightweight Aggregate in Foamed Concrete of Floor Slabs on Impact Sound Insulation

The floor impact sound is one of the serious noises in residential building in Korea. Most of heating system applied to the typical Korean residential building is floor heating system which is called Ondol. The Ondol usually consists of finishing material, mortar with heating coil and lightweight aerated concrete on reinforced concrete floor slab. This study is focused on the performance of heavy-weight impact sound insulation by modifying cement mortar and lightweight aerated concrete of floor slab. In this study, artificial Lightweight Aggregate was added to lightweight aerated concrete with proper water-cement ratio, and the amount of cement mortar was revised. The Sound pressure level of heavy-weight impact was measured in real-sized test room by using both bang-machine and impact ball. Heavy-weight impact sound pressure level was decreased in the floor slab with artificial Lightweight Aggregate which was added to lightweight aerated concrete. In addition, the sound pressure level measured by bang-machine was shown to be higher than that by impact ball.