DE102008060102A1 - Noise control installation comprises a carrier layer formed from reinforced or unreinforced concrete, and an absorber layer provided on the carrier layer and formed from a mineral binder and a mineral aggregate - Google Patents

Abstract

The noise control installation comprises a carrier layer formed from reinforced or unreinforced concrete, and an absorber layer provided on the carrier layer and formed from a mineral binder, mineral aggregate and an aggregate (1) from high polymeric, elastic, surface mineralized materials. The aggregate is partially formed from rubber granulates (2) on which an elastic protective layer (3) covering the rubber granulate, and a mineral coating equipped on the elastic protective coating are equipped. The rubber granulate is formed from recycled old tire. The noise control installation comprises a carrier layer formed from reinforced or unreinforced concrete, and an absorber layer provided on the carrier layer and formed from a mineral binder, mineral aggregate and an aggregate (1) from high polymeric, elastic, surface mineralized materials. The aggregate is partially formed from rubber granulates (2) on which an elastic protective layer (3) covering the rubber granulate, and a mineral coating equipped on the elastic protective coating are equipped. The rubber granulate is formed from recycled old tire. The rubber granulate has an average grain size of 2-7 mm. The elastic protective layer is formed from polymeric binder and has a layer thickness of 50-200 mu m. The mineral coating is a rock flour with a grain size in mu m range. The mineral aggregate comprises grit and/or sand in grain size of 4 mm and/or light weight aggregate. The mineral binder is cement. Textile fibers are provided in the absorber layer. The absorber layers are provided on both sides of the carrier layer. The absorber layer has a profiled surface, which has a trapezoidal or wave-like profile. An independent claim is included for an aggregate for forming an absorber layer of a noise control installation.

Description

The The present invention relates to a noise control device with a base layer consisting essentially of reinforced or unreinforced concrete, wherein provided on the support layer at least one absorber layer is, and wherein the absorber layer of at least one mineral Binders, mineral aggregates and an aggregate made of a high polymer, elastic, surface mineralized Material is formed. The invention further relates to an additive for the formation of an absorber layer of a noise protection device, wherein the aggregate of a high polymer, elastic, surface mineralized Material is formed.

A noise protection device and an aggregate of the above type are from the document DE 198 04 770 A1 known. The document describes a noise barrier, which is composed of two layers or shells, one layer is a heavy concrete tray, which meets the static requirements of the noise barrier, while the other layer is an absorption layer of a sound-absorbing and sound-absorbing concrete. The absorption layer has the function of a facing the sound source attachment shell and is essentially formed of a mixed with a high polymer additive concrete.

On the one hand, the publication refers to the document for the production of the high polymer additives WO 93/16009 according to which shredded unsorted materials and scraps of material of the plastics, textile, leather and artificial leather industries are subjected to a shock-like thermal radiation to intertranspress and activate them before they are mixed with crystal-forming aqueous solutions of mineral binders in a photochemical treatment. For this purpose, it is pointed out that the colorful appearance and the economically complicated process for producing such high polymer additives are disadvantageous.

As an alternative to the preparation of high polymer additives that in the document DE 1 96 32 446.7 described method specified. Here are coarsely pre-shredded high-polymer recyclables, especially textile and plastic waste industry, households and trade, thermally treated in an agglomerator, inertized and shocked in the agglomerator with a crystal-forming aqueous mineralization solution at least once, with the amount of mineralization solution supplied dosed must meet the requirements of shock and mineralization. It may be necessary to add mineralization solution within or outside of the agglomerator several times if necessary in order to achieve sufficient mineralization of the agglomerate. Thus, even if this process is to have a sufficient amount of mineralized crystals with the required adhesion to the surface of the agglomerate, it is relatively expensive.

In the in the publication DE 198 04 770 A1 recommended high polymer aggregates, it is essential that they are surrounded by a well-adhering mineral material. Only then can an advantageous incorporation of these additives into the concrete of the absorption layer take place, since experience shows that untreated high polymer additives dissolve over time from a composite material containing concrete, so that such composites do not have the corresponding lifetime and bond strength.

It Therefore, the object of the present invention is a noise protection device and an additive for the formation of an absorber layer a noise protection device with very good sound absorption and to provide sound insulation properties, which can be produced inexpensively by simple means is, as well as having a long life and bond strength.

The Task is on the one hand by a noise protection device with an absorber layer of the abovementioned type, wherein the aggregate is at least partially made of a rubber granulate is formed, on which a rubber granulate enveloping, elastic protective layer and one on the elastic protective layer provided mineral coating is provided.

The Task is further characterized by an aggregate of the above Species solved, the aggregate of a rubber granules is formed, on which a rubber granulate enveloping, elastic protective layer and one on the elastic protective layer provided mineral coating is provided.

The inventively provided, the rubber granulate enveloping, elastic protective layer on the one hand provides a good connection to the rubber granulate and on the other hand provides an optimal basis for the applied mineral coating available. Thus, the elastic protective layer can be well mixed with the rubber granules in initially liquid form, wherein the rubber granules can be wetted on all sides by the material of the elastic protective layer. Then, when a hardening reaction of the material of the elastic protective layer takes place, a material for the intended mineral coating are applied to the rubber granulate encased in the material of the elastic protective layer, whereby the mineral coating adheres particularly well to the elastic protective layer underneath.

in the The result may be an aggregate of a high polymer, elastic Material with a highly adherent surface mineralization be made available due to the high quality Mineralized surface very good in that at least a mineral binder and the mineral additives containing composite material of the absorber layer inserts. In particular, the invention is with the elastic protective layer and the mineral material coated Rubber granules make a good connection with concrete, which makes the trained Absorber layer a very low tendency to cracking, a high Durability and very good bond strength has. Further shows the with the additive of the invention staggered absorber layer has high resistance to freeze-thaw stress, a high impact protection by the elasticity of the introduced Rubbers, high shock absorption and stone chip resistance, a very good sound insulation and a good sound absorption. In addition, by the with the inventive Aggregate provided absorber layer temperature-related stresses balanced in the concrete by the elasticity of the aggregate become.

Corresponding may be a noise reduction device, such as a Noise barrier system, with a very good sound-absorbing and at the same time-insulating absorber layer provided become.

According to one advantageous embodiment of the present invention the rubber granulate is made from recycled scrap tires. On This way, used tires can be reused in shredded form in an environmentally sound way are made of recycled rubber tires produced from recycled mature having particularly good elastic properties in the context of the invention.

in this connection It is particularly favorable if the old tires used truck tires are. Truck tires are made of a higher quality material as the tires are formed by passenger cars, causing the rubber granules provided in higher quality can be.

Corresponding an advantageous embodiment of the present invention the rubber granulate has an average grain size of about 2 mm to about 7 mm. This grain size guarantees on the one hand a good integration into the mineral binder the absorber layer, wherein the grain size sufficient great is the elastic properties of rubber granules advantageous to be effective in the binder.

Preferably is the elastic protective layer of a polymeric binder formed from the group of acrylate resins, a polyurethane or epoxy-containing binder or a mixture thereof is. These materials are particularly well suited to provide an elastic coating over To produce the rubber granulate, wherein the specified materials combine well with the rubber granules, so a good Durability of the elastic protective layer on the rubber granulate is guaranteed.

It has proved to be particularly advantageous when the elastic Protective layer has a layer thickness of about 50 microns to about 200 microns has. This layer thickness guaranteed on the one hand a good envelope of rubber granulate through the elastic protective layer and on the other hand a good connection of the mineral coating to the elastic protective layer during the crosslinking reaction of the material of the elastic protective layer.

Preferably the mineral coating is a rock flour with a grain size in the μm range. The micro-coating with rock flour allowed a good adhesion of the rock flour to the elastic protective layer and thus a good cladding of rubber granules the rock flour.

According to one favorable example of the invention include the mineral Additions of gravel and / or sand in grain sizes to about 4 mm and / or lightweight aggregates. By selection and amount of mineral supplements provided the properties of the absorber layer, such as their bond strength and durability, be favorably influenced.

Preferably is the mineral binder cement used. So that's it Base material of the absorber layer concrete, giving a good connection the absorber layer to the support layer and their preparation in wet-in-wet technology.

According to one advantageous development of the invention are in the absorber layer textile fibers provided. The textile fibers can as Short, long or continuous fibers or in the form of a fabric or Knitted fabric to be incorporated into the absorber layer. The intended textile fibers lead to an increase in bending tensile strength the absorber layer.

In a further advantageous embodiment of the invention Absorber layers are provided on both sides of the base layer. Consequently can be a noise protection element with a three-layer construction be made available, with which each side of the Noise protection element sound-absorbing and immediately insulating Features.

In a further advantageous embodiment of the Invention, the absorber layer has a profiled surface on. The surface may be, for example, a trapezoidal or wavy profile. Because of the engagement Such profiled surfaces, the sound absorption and Schalldämmeigenschaften the absorber layer and thus the Noise protection device can be further increased.

advantageous Embodiments of the present invention, the function, Construction and properties are described below with reference to the figures the drawing explained in more detail, wherein

1 schematically shows in cross section a basic structure of a particle of an inventively provided, multi-layer coated aggregate;

2 schematically shows a possible embodiment of the noise protection device according to the invention in a sectional side view;

3 schematically the absorber layer of the noise protection device according to the invention 2 in a perspective view; and

4 schematically shows a further possible embodiment of a noise protection device according to the invention with absorber layers provided on both sides in a perspective view.

1 shows schematically in cross-section a particle of an inventively provided, multi-layer coated aggregate 1 , The particle of aggregate shown 1 has inside a grain of a high polymer elastic material. In the in 1 As shown, the high polymer elastic material is a rubber elastic granulate 2 , which is made from recycled scrap tires, preferably used truck tires. Such a rubber granulate can be produced, for example, by comminution of waste tires in a warm-milling extruder. The rubber granulate 2 has an average grain size d of about 2 mm to about 7 mm.

Around the grain of the rubber granules 2 is an envelope made of an elastic protective layer 3 intended. In the in 1 the embodiment shown is the elastic protective layer 3 made of polyurethane. In other, not shown embodiments of the invention, the elastic protective layer 3 also be selected from another polymeric binder, such as a binder from the group of acrylate resins, a polyurethane or epoxy-containing binder or a mixture thereof. The elastic protective layer 3 has in the example shown a layer thickness of about 50 microns to about 200 microns. In other, not shown embodiments of the present invention, the elastic protective layer 3 also have a different thickness. The elastic protective layer 3 is firmly on the surface 21 the grain of rubber granulate 2 tethered.

To the elastic protective layer 3 indicates the aggregate 1 a mineral coating 4 on, which is formed in the example shown from a rock flour with a grain size in the micron range. The mineral coating 4 is firmly attached to the elastic protective layer 3 bound.

The aggregate 1 can be particularly well integrated by its mineral coating in a mineral binder, such as concrete, whereby the elastic properties of egg in the aggregate 1 located rubber granulate 2 advantageous in a mineral binder or concrete-containing layer can be integrated. Thus, the additive is suitable 1 in particular for integration into an absorber layer 5 . 7 , as described for example in the following 2 . 3 and 4 is shown.

2 schematically shows a sectional side view of a possible construction of a noise protection device 10 , The noise protection device 10 from 2 is as a noise barrier system with a base layer 6 and an absorber layer provided thereon 5 educated.

The base course 6 is in the in 2 Example shown a concrete layer with spacers and a reinforcement 8th , In other, not shown embodiments of the present invention, the support layer 6 also be an unreinforced concrete layer depending on the static-constructive requirements.

On the absorber layer 5 is the base layer 6 preferably applied in a wet-on-wet technology. The absorber layer 5 is made of at least one mineral binder, such as concrete 9 forming cement, mineral aggregates 12 and in the 1 schematically shown additive 1 made of a high polymer, with an elastic protective layer 3 and a surface mineralization 4 provided material designed.

The mineral supplements 12 may include normal aggregates, such as gravel and / or sand, in grain sizes from 0 to about 4 mm and / or light aggregates.

When mineral binder is mainly used cement, it However, other mineral binders can also be used for Use come.

Additionally, in the absorber layer 5 also textile fibers as short, long or continuous fibers or in the form of a woven or knitted fabric to increase the bending tensile strength of the absorber layer 5 to be involved. Furthermore, further additives to improve the concrete technological properties in both the support layer 6 as well as in the absorber layer 5 possible.

As in 2 shown schematically, distribute the mineral supplements 12 as well as the rubber granulate 2 containing additive 1 evenly in the material of the absorber layer 5 , where both materials due to their mineralized or mineral surfaces, a good integration into the mineral material 9 the absorber layer 5 allow. Due to the core of the aggregate 1 rubber granulate 2 become the concrete technical properties of the absorber layer 5 clearly improved. In particular, the absorber layer shows 5 a significantly reduced cracking compared to other known Schallabsorptions- or Schalldämmvorsatzschalen on concrete support layers. Furthermore, results from the use of mineral-coated rubber granules 2 an increase in durability, a huge increase in the resistance to frost-thawing of the noise reduction device 10 , an improvement of the elasticity, an improved impact protection by the elasticity of the rubber granules 2 , an increase in shock absorption, a very good stone dust resistance, a very good bond strength, good sound absorption and a very good sound insulation. In addition, temperature-induced stresses in the concrete due to the elasticity of the rubber granulate used 2 be compensated.

The structure out 2 can be prepared as follows: First, the rubber granules 2 For example, from old tires, preferably from old truck tires, produced in particle sizes of about 2 mm to about 7 mm. The rubber granulate 2 is then introduced into a mixer, for example a concrete mixer. There is the rubber granules 2 a polymeric binder, such as polyurethane, added in liquid form. The polymeric binder runs evenly in the mixer around the rubber particles of the rubber granules 2 , The rubber particles are mixed with the introduced polymeric binder in the mixer until all the rubber particles of the rubber granulate 2 wetted with the polymeric binder. Thereafter, water is added to accelerate the crosslinking reaction of the polymeric binder. The amount of water is chosen depending on the existing humidity. When the crosslinking reaction, ie the curing reaction of the polymeric binder or polyurethane, is started, rock flour is added to the mixer. The crosslinking reaction must have started, but by no means should it be completed.

The amount of added rock flour is to be selected so that a complete enclosure of the rubber granules 2 is ensured, but no loose rock flour mix remains in the mixer. The rock flour is preferably introduced batchwise into the mixer in order to allow accurate dosing and a working environment with low dust formation.

The mixture of rubber granulate 2 , the polymer binder bound thereto and the added rock flour is mixed until a free-flowing, mineral-coated rubber granulate or the in 1 schematically shown additive 1 arises.

For the production of the absorber layer 5 become the surface mineralized rubber granulate or aggregate 1 , mineral supplements 12 and cement mixed with water. Mixing is similar to a concrete mixing operation, but more intense and longer. This avoids that the additive according to the invention 1 unmixed. The result is a homogeneous distribution of the aggregate 1 and the mineral supplements 12 in the concrete 9 the absorber layer 5 reached.

The material mixture is introduced into a mold or formwork. The shape may have a profiling, so that the absorber layer 5 For example, with a trapezoidal or wavy surface, depending on the required sound absorption, can be provided.

following a compression of the material mixture by vibration and Pressure, for example by using a vibrating plate.

Then, in a wet-on-wet technology, the supporting concrete layer becomes 6 on the absorber layer 5 applied. For this purpose, first spacers and the reinforcement 8th placed in the mold. Then the concrete for the supporting concrete layer 6 loosely filled in the mold. Finally, the support concrete layer 6 compacted.

3 shows schematically the absorber layer 5 the noise protection device 10 out 2 in a perspective sectional side view. Here again is clearly the trapezoidal profile of the surface 51 the absorber layer 5 recognizable, whereby a particularly good sound absorption and sound insulation can be achieved.

4 schematically shows a further possible embodiment of a noise protection device according to the invention 11 , The noise protection device 11 is just like the noise protection device 10 out 2 a noise barrier system, which, however, here one between two absorber layers 5 . 7 embedded base course 6 is trained. The base course 6 out 4 has the same properties as the base layer 6 out 2 on, why here on the comments made above on the base course 6 is referenced. Likewise, each of the absorber layers 5 . 7 similar to the absorber layer 5 the noise protection device 10 out 2 formed, which is why reference is made here to the above statements.

Just like the in 2 illustrated noise protection device 10 becomes the noise protection device 11 out 4 preferably produced in a wet-on-wet technology. This is done in a similar way as above 2 described, proceeded. The further absorber layer 7 finally gets wet-on-wet on the supporting concrete layer 6 applied. Also the noise protection device 11 shows over conventional noise protection devices significantly improved properties by the inclusion of the mineralized elastic rubber granules 2 and its optimal integration into the concrete 9 the absorber layers 5 and 7 , The layered structure of the noise protection device 11 also allows a particularly simple production of the noise protection device 11 , wherein numerous modifications with regard to the layer sequence, the surface profiling, the layer thickness, etc. of the noise protection device 11 , depending on the required sound absorption, are possible.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 19804770 A1 [0002, 0005]
• - WO 93/16009 [0003]
• - DE 19632446 [0004]

Claims (14)

Noise protection device ( 10 . 11 ) with a base layer formed essentially of reinforced or unreinforced concrete ( 6 ), wherein on the support layer ( 6 ) at least one absorber layer ( 5 . 6 ), and wherein the absorber layer ( 5 . 6 ) of at least one mineral binder, mineral aggregates ( 12 ) and an aggregate ( 1 ) is formed of a high polymer, elastic, surface mineralized material, characterized in that the aggregate ( 1 ) at least partially from a rubber granules ( 2 ) is formed, on which a rubber granules ( 2 ) enveloping, elastic protective layer ( 2 ) and one on the elastic protective layer ( 2 ) provided mineral coating ( 4 ) is provided. Aggregate ( 1 ) for the formation of an absorber layer ( 5 . 7 ) of a noise protection device ( 10 . 11 ), the aggregate ( 1 ) is formed of a high polymer, elastic, surface mineralized material, characterized in that the aggregate ( 1 ) from a rubber granule ( 2 ) is formed, on which a rubber granules ( 2 ) enveloping, elastic protective layer ( 3 ) and one on the elastic protective layer ( 3 ) provided mineral coating ( 4 ) is provided. Apparatus according to claim 1 or 2, characterized in that the rubber granulate ( 2 ) is made of recycled scrap tires. Device according to claim 3, characterized in that that the used tires are truck tires. Device according to one of the preceding claims, characterized in that the rubber granules ( 2 ) has an average grain size of about 2 mm to about 7 mm. Device according to one of the preceding claims, characterized in that the elastic protective layer ( 3 ) is formed from a polymeric binder which is selected from the group of acrylate resins, a polyurethane- or epoxy-containing binder or a mixture thereof. Device according to one of the preceding claims, characterized in that the elastic protective layer ( 3 ) has a layer thickness (s) of about 50 microns to about 200 microns. Device according to one of the preceding claims, characterized in that the mineral coating ( 4 ) is a rock flour with a particle size in the micron range. Device according to claim 1, characterized in that the mineral aggregates ( 12 ) Gravel and / or sand in grain sizes up to about 4 mm and / or lightweight aggregates include. Device according to claim 1 or 9, characterized that the mineral binder is cement. Device according to one of the preceding claims, characterized in that in the absorber layer ( 5 . 7 ) textile fibers are provided. Device according to one of claims 1, 9 or 10, characterized in that on both sides of the support layer ( 6 ) Absorber layers ( 5 . 7 ) are provided. Device according to one of the preceding claims, characterized in that the absorber layer ( 5 . 7 ) a profiled surface ( 51 . 71 ) having. Device according to claim 13, characterized in that the surface ( 51 . 71 ) has a trapezoidal or undulating profile.