Why different buildings sound a lot worse?
Because of the different buildings of the building extension and the internal structure of the different, resulting in different sound effects.
Masonry wall of the board is usually the thickness of 60 ~ 120mm, surface density is generally less than 80kg / m2, with light, easy construction and so on.
The slabs can be subdivided into two categories: one is solid or porous slabs made of inorganic cementitious material and aggregates, such as (reinforced) lightweight aggregate concrete slabs, autoclaved aerated concrete slabs , Steel wire mesh ceramic concrete slab, gypsum board, etc., this type of single-layer lightweight slab wall insulation volume is usually between 32 ~ 40dB; the other is by the dense layer of material and light core material in the production Prefabricated synthetic prefabricated sandwich panels, such as concrete rock wool or polystyrene sandwich panels, fiber cement board light sandwich panels and so on. The volume of the prefabricated sandwich panel is usually between 35 and 44 dB.
Block varieties are more, according to the functional division of load-bearing and non-load-bearing block. Commonly used blocks are mainly ceramic, fly ash, slag, sand and other concrete hollow and solid blocks; gypsum, calcium silicate and other blocks.
The volume of the block wall varies with the weight of the wall. Surface density and clay brick wall similar to the load-bearing block wall, the sound insulation performance and clay brick wall is also close. Cement mortar Plastering Lightweight blocks filled with wall insulation performance, largely depends on the thickness of the wall surface plaster layer. Both sides of the wiping 15 ~ 20mm thick cement mortar after the volume is about 43 ~ 48dB, the surface density of less than 80kg / m2 light block wall insulation is usually below 40dB.
200mm above the thickness of the solid reinforced concrete wall insulation volume and 240mm clay brick wall insulation volume close to 150 ~ 180mm thick concrete wall of the volume of about 47 ~ 48dB, but the surface density of 200kg / m2 reinforced concrete perforated plate, The volume is below 45dB.
