Determining sound transmission class stc for concrete masonry.
Absorption coefficient concrete floor.
Can be calculated as.
Table 2 summarizes the details of the sound absorption coefficient and fig.
40 m 2 fiberboard walls with absorption coefficient 0 3.
If a generated sound level of 80 db is observed in one room and 30 db is measured in an adjacent.
Floor materials 125 hz 250 hz 500 hz 1 khz 2 khz 4 khz.
Linoleum vinyl tile on concrete.
Absorption coefficients of common building materials and finishes floor materials 125 hz 250 hz 500 hz 1 khz 2 khz 4 khz carpet 0 01 0 02 0 06 0 15 0 25 0 45 concrete unpainted rough finish 0 01 0 02 0 04 0 06 0 08 0 1 concrete sealed or painted 0 01 0 01 0 02 0 02 0 02.
4000 hz concrete or tile.
Concrete sealed or painted 0 01.
Floor materials 125 hz 250 hz 500 hz.
Wood parquet on concrete.
The total sound absorption in a room with.
Marble or glazed tile.
Tables of random incidence absorption coefficients α.
The effectiveness of wall construction as a means of sound absorption is tested in a similar manner as that of stc.
Energy μ ρ μ en ρ mev cm 2 g cm 2 g 1 00000e 03 3 466e 03 3 456e 03 1 03542e 03 3 164e 03 3 156e 03 1 07210e 03 2 889e 03 2 880e 03 11 k 1 07210e 03 2 978e 03 2 968e 03 1 18283e 03 2 302e 03 2 295e 03 1 30500e 03 1 775e 03 1 769e 03.
Vinyl tile or linoleum on concrete.
Concrete floor 0 01 0 03 0 05 0 02 0 02 0 02 0 02 marble floor 0 01 0 01 0 01 0 02 0 02 0 02 0 02 lightweight constructions and linings material octave band frequency in hz 125 250 500 1k 2k 4k 8k 2 13 mm plasterboard on steel frame.
13 presents the comparison of nrc computed based on the sound absorption coefficients for the concrete or cement based materials of various densities.
It can be summarized that the cement based products which possess good absorption coefficient have relatively low.
A surface absorbing 35 of the sound would have a coefficient of 0 35.
Sound transmission class stc provides an estimate of the acoustic performance of a wall in certain common airborne sound insulation applications the stc of a wall is determined by comparing sound transmission loss stl values at various frequencies to a standard contour stl is the decrease or attenuation in sound energy in db.
100 of the sound would have a sound absorption coefficient of 1 0.
10 m 2 concrete floor with absorption coefficient 0 02.
10 m 2 concrete roof with absorption coefficient 0 02.
Concrete unpainted rough finish 0 01.