The property of Sound Absorbing Mortar by which sound energy (kinetic energy) is converted into another form of energy, generally heat energy (due to friction), and gets absorbed.
The degree to which this surface affects the absorption of sound is known as the absorption coefficient.
There is no royal road for making a particular room acoustically good. It mainly depends on the ideas of the engineer or the Architect. Each case is to be studied separately and after proper thinking and calculations, suitable materials may be specified.
Sound-absorbing mortar is the most powerful material today and the most cost-effective sound-absorbing and noise-reducing material. It is widely used in road tunnels, especially city subways, underground stations, train stations, underground garages, roof fenders, swimming pools, soundproof walls on both sides of railways and roads, machine rooms large rooms with dense personnel Fire-retardant soundproofing mortar surface can be sprayed with multi-colored water-based paints, which has a very good decorative effect. Fire-retardant soundproofing mortar can be sprayed on the surface of concrete slabs, slabs, or other panels, cleaning without varnish or putty, some special surfaces can be coated with galvanized wire mesh coated and then sprayed on the galvanized wire.
Flame retardant sound-absorbing mortar can be used in any harsh environment such as hot and cold. In cold rooms, a wire mesh made of galvanized iron and then sprayed on a galvanized wire mesh. The fire retardant sound-absorbing mortar has excellent fire retardant performance Product has been tested to achieve a non-flammable class A1 and has a fire-resistance limit of 2 hours. It can replace the refractory lining of the tunnel when using the tunnel. The fire-resistant soundproofing mortar is maintenance-free and the surface can be cleaned with high-pressure water and cleaning agents. Packaging material: thick cotton paper bag with moisture-proof packaging film, 15 kg per package. It is recommended that the construction company commissioned by the factory carry out the spray construction and that the construction technicians complete the technical training and the building permit. Material storage: Material packaging must not open, must be kept at a certain distance from the floor, and must be kept dry. Material storage time is 3 years. Features:
(1) Excellent sound absorption performance
(2) Excellent decorative effect
(3) Preventive fire protection (fire protection class A1, fire resistance 2 hours, alternative fire-retardant coating in the tunnel)
(4) does not contain mineral fibers, asbestos, glass fibers, or vegetable fibers
(5) non-toxic, not radioactive, not irritating(6) Strong weather resistance, can be used in any harsh environment
(7) Maintenance-free, the surface can be cleaned with high-pressure water and detergent
(8) Low total cost
(9) Concrete slab surfaces, panels, or other clean panels that can be applied to sheet steel, galvanized iron sheet, unpainted or sprayed putty
Requirements Of A Good Sound Absorbing Mortar
Efficient over wide range of frequencies,
Non- Hygroscopic and heat insulating,
Self- supporting and Easly fixable,
Pleasing in appearance,
High coefficient of absorption,
Sufficient structural strength.
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TYPES OF SOUND ABSORBING MATERIALS
POROUS MATERIALS:- The basic acoustic property of all porous materials is a cellular network of tiny interlocking pores that convert incident sound energy into thermal energy through frictional resistance and viscosity within these pores and through the vibration of their tiny fibers. Fiberboard, mineral wool, insulation mats, etc. are some examples of glass wool
NON PERFORATED PANELS & MEMBRANE ABSORBERS:- Any soundproof material installed on a solid surface but separated from it by an air gap will vibrate when hit by sound waves. Good for the low frequency range. Plaster, hard plastic panels, windows, glazing, doors, wooden floors and platforms, etc.
CAVITY OR HELMHOLTZ RESONATORS:- They consist of a closed body of air that is enclosed in rigid walls and connected to the surrounding space through a narrow opening (known as a neck), in which the sound waves propagate. Cavity resonators can be used as individual units as perforated plate resonators as slot resonator plates
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TYPES OF SOUND ABSORBING MATERIALS
- HAIR FELT,
- ACOUSTIC PLASTER,
- ACOUSTICAL TILES,
- PULP BOARDS,
- COMPRESSED FIBREBOARDS,
- COMPRESSED WOOD PARTICLE BOARDS,
- PERFORATED PLYWOOD,
- WOOD WOOL BOARD,
- QUILTS AND MATS
The material was used by Professor Sabin in his experimental work on wool and fur. The mean value of the absorption coefficient of the 25 mm thick heart is 0.60. It is used in rooms and hallways.
Also known as plaster of Paris, it contains granulated insulating material mixed with cement. The average absorption coefficient of 20 mm thickness and density of acoustic plaster 1 kN / m3 is 0.30 to 500 cps. For acoustic plasterboard – 0.15-0.30.
They are uniform sound absorbers, factory-made, easy to repair, but expensive. They are best suited for rooms where a small area is available for acoustic treatment.
It is made of pressed straw and covered with thick paper or hardboard. The average value of the absorption coefficient of 13 mm thickness and density of 12.4 kN / m3 is 0.3 to 500 cps. It is used in rooms and rooms of medium capacity.
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These are soft panels made from compressed cellulose. The average value of the absorption coefficient for 13 mm thickness is 0.17 to 500 cps. They are cheap and can be attached with ordinary panels.
Composed of compressed fiber, it can be perforated or imperforated. The mean value of the absorption coefficient of one drilled with a density of 3 kN / m3 is 0.30 and the other 0.52.
COMPRESSED WOOD PARTICLE BOARD
Made of pressed wood and provided with perforations and can also be painted. The average value of the absorption coefficient for 13 mm thickness is 0.40 to 500 cps.
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It can be used by forming composite panels with mineral wool and cement asbestos, or with mineral wool and hardboard. Generally hung on trusses. The average value of the absorption coefficient for the first is 0.95 and for the second it is about 0.20.
WOOD WOOL BOARD
Made from a mixture of portland cement and wood wool or wood shavings. Sometimes a small amount of plaster of Paris is added. The average value of the absorption coefficient of 25 mm thickness and density of 4 kN / m3 is 0.20 to 500 cps.
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QUILTS AND MATS
Made of mineral wool or glass wool and fixed in the form of acoustic ceilings. The absorption coefficients of such blankets and mats depend on the thickness, density, perforation, type of fastening, type of backrest and frequency of the sound.
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