KR100747619B1 - Sound absorption type sound proofing panels using lightweight aggregate of bottom ash - Google Patents

Abstract

The present invention relates to a sound-absorbing soundproof panel using low aggregate light weight aggregate to utilize as a soundproof wall to block traffic noise. By using low ash in a conventional lightweight aggregate soundproof panel, recycling lightweight waste and conserving the environment to replace lightweight aggregate The purpose is to secure large-scale demand for low-lying customers. To this end, the present invention uses a sound absorbing material composed of a light aggregate having a volume ratio of 45-55% and a binder having a volume ratio of 25-35%, mixing water at a volume ratio of 20-25%, and mixing a high performance water reducing agent at a volume ratio of 1% of the water. It consists of a sound insulation material consisting of a concrete (1) of 50-120mm thickness embedded in a single-sided or double-sided 80-120mm sound absorbing layer 3, the reinforcement or wire mesh wire mesh (2), Lightweight aggregate is a bottom ash selected with a particle size of 1.25-5mm among the bottom ash embedded, the binder is a main component of cement, the reducing agent is characterized in that the polycarboxylic acid-based, melamine-based or naphthalene-based.

Description

Sound absorption type sound proofing panels using lightweight aggregate of bottom ash}

1 is a block diagram of a method for manufacturing a lightweight aggregate soundproofing panel according to the present invention.

Figure 2 is a particle size curve of the bottom ash used in the manufacture of a lightweight aggregate soundproofing panel according to the present invention.

Figure 3a to 3c is a cross-sectional view of the samples 1, 2, 3 of the lightweight aggregate soundproofing panel according to the present invention.

Figure 4a and Figure 4b is a cross-sectional view of the first embodiment of the lightweight aggregate soundproofing panel according to the present invention.

Figure 5 is a cross-sectional view of a second embodiment of a lightweight aggregate soundproofing panel according to the present invention.

Explanation of symbols on the main parts of the drawings

1: concrete 2: rebar or wire mesh wire mesh

3, 13: sound absorption layer 11: galvanized steel sheet

12: air layer

The present invention relates to a sound-absorbing soundproof panel using low ash lightweight aggregate manufactured by using 1.25-5mm light weight aggregate from bottom ash, which is unrefined coal ash from domestic power plants. As a by-product of (non-coal) coal-fired power plant, unrefined coal ash, which is hardly recycled, is picked up to 1.25-5mm by sieving, and the panel sound-absorbing material is made using a binder such as cement, and combined with the sound insulation layer to make sound-absorbing soundproof walls. The present invention relates to a sound-absorbing soundproof panel using low-weight lightweight aggregates that can prevent the expansion of reprocessing plants by recycling the by-products of landfills, which are only landfilled.

The high noise around the roads and railways affects the neighboring areas. Sound insulation walls are widely used to block such traffic noise. The types and status of sound barriers are as follows.

Table 1. Types and Current Status of Soundproof Walls

characteristic material Application section Sound absorption type -Absorb sound from the flaw material in front of soundproof wall-Block the landscape Metal Wood FRP Lightweight Aggregate -City center-If there are buildings on both sides Reflective -Sound isolation and reflection-Opposite side becomes noisy concrete -If there is only one building Transparent -Sound blocking and reflection-Possible to secure view right PMMA polycarbonate -If you need viewing and sunshine-Mixed with sound-absorbing sound barrier Special type Interference -Interference effect due to interference for incident sound Metal FRP -Places restricted by the height of sound barriers-Installed on top of existing sound barriers Diffraction -The incident sound absorbs as much as possible in the upper diffraction of the sound barrier to reduce noise

In Korea, the population is dense and it is rare to use reflective sound barriers. Most of them are based on sound-absorbing sound barriers, and if a double view is required, transparent sound barriers will be installed in the middle. In addition, when there are high-rise buildings in the downtown area and the soundproof wall needs to be high, an interference type or diffractive soundproof wall is installed on the top of the soundproof soundproof wall.

All. For the same reason, most sound barriers are sound-absorbing sound barriers. Types and problems of existing sound-absorbing sound barriers are as follows.

Table 2. Types and Problems of Existing Sound Absorbing Sound Walls

division Metal Foamed Aluminum FRP wood Lightweight aggregate concrete Aluminum Color aluminum Tube type Material composition Front: Aluminum / Galvanized steel Sound absorption material: Glass cotton / Polyester Rear: Zinc steel sheet Front and sound-absorbing material: Foamed aluminum Rear: Zinc-plated steel Front: FRP color sound absorption material: Polyester rear: ABS resin / galvanized steel sheet Front: solid wood (preservative) Sound absorbing material: rock wool Rear: plate (preservative) Front and Sound Absorbing Material: Lightweight Aggregate Rear: Concrete Construction -Light weight, no height limit-Tunnel structure possible -Handled by large panels-Limited to height -Easy to install due to assembly type-Height limit to own weight weight 25kg / ㎡ 35kg / ㎡ 22-30kg / ㎡ 50kg / ㎡ 300kg / ㎡ durability -Corrosion of aluminum-Peeling of coating-Damage to shock-Damage of sound absorbing layer and scattering of sound absorbing material-7-10 years Aluminum corrosion-10 years -No corrosion-Resistant to air pollution-15 years -Decay in case of insufficient preservation-Wood warping and cracking-10 years -No discoloration and durable-Replaceable in case of damage-Excellent maintenance-30 years minimum Maintenance -Need to clean by discoloration and smoke-Damage to sound absorbing material when cleaning water-Difficult to maintain -Water cleaning available-Easy maintenance -Easy to clean due to strong discoloration-Easy maintenance -Difficult to clean water in case of contamination-Expensive when replacing-Difficult to maintain -No discoloration and strong against smoke-Excellent maintenance

Light aggregate concrete soundproof walls are mainly used in various countries in Europe such as Germany, Netherlands, Denmark and Switzerland. The reason is that only lightweight aggregate concrete soundproof walls are easy to maintain and can be combined with the surrounding landscape for a long life of more than 30 years.

In Korea, there is a growing interest in lightweight aggregate concrete soundproof walls, which can be harmonized with the surrounding landscape and provide a long service life. To this end, the lightweight aggregate concrete soundproof walls used in Europe have been introduced in 2002.

Table 3. Comparison of Lightweight Aggregate Concrete Soundproof Walls Tryed in Korea after 2002

division Volcanic Stone Lightweight Aggregate Concrete Soundproof Wall Natural processing lightweight aggregate concrete soundproof wall Light aggregate production method Crushing porous volcanic stone and sieving After shale collection, expand and fire at 1200 ℃ and sift Aggregate Producing Area Volcanoes in Europe and Asia Europe, China, etc. Thickness of sound absorbing layer Produce porous concrete to 80-120mm thickness by mixing lightweight aggregate with cement Backplane Usually made of concrete 80-120mm thick

The thickness of the back panel is determined by the width of the sound insulation board to withstand wind loads caused by wind. Therefore, the difference between the light weight aggregate soundproof wall is only the difference between the material used as lightweight aggregate.

The problems of the light weight aggregate concrete soundproof wall produced by the technology introduction are as follows.

First, we rely on imports of lightweight aggregate. Although porous volcanic stones are produced in Jeju Island, they cannot be taken out, so they are imported from nearby Philippines.

On the contrary, natural processed lightweight aggregates have been tried many times in Korea, but most failed because of problems in strength and particle shape. Chinese lightweight aggregate has no porosity on the surface, so there is a problem in sound absorption performance, and currently imported from Germany or Czech Republic. Therefore, there is a need for alternative methods of lightweight aggregates that are dependent on imports.

Second, lightweight aggregate concrete soundproof walls are concrete in the back, so there is no problem in use in Europe where most of the flat land. However, in Europe, sound absorbing metal barriers are used in bridge sections to reduce weight. Therefore, in Europe, there is no soundproof wall using lightweight aggregate in bridges or elevated sections.

In Korea, there are many mountainous terrains, so many bridges are used, and roads and railways are made at high prices in urban areas. Therefore, the demand for high prices and bridges is about 35% of all roads and railways.

However, lightweight aggregate concrete soundproof walls are more than 10 times heavier than metal soundproof walls and are difficult to use. Therefore, it is necessary to develop lightweight soundproof walls using lightweight aggregates.

On the other hand, coal ash occurs after burning coal in domestic coal-free coal-fired power plants. Fly ash is a fine size particle that is filtered by a filter as it passes through a combustion furnace together with combustion gas. Bottom ash is formed by solidification by sintering in the combustion furnace. It is ground to a particle size of 25mm or less through.

Among them, fly ash accounts for 70-90% of coal ash, but the majority of fly ash produced is used as cement admixture, and many applications are developed and supply is insufficient.

However, the low ash, which accounts for 10-30% of coal ash, has been used almost completely, and has been completely reclaimed by building breakwater around the power plant.

In addition, the shortage of landfill is increasing due to the low circuit of hundreds of thousands of tons every year, and there are problems such as damage to the environment with scattered dust around the landfill, and there are few products using low ash. Development is urgent.

Therefore, the present invention was developed in view of the above circumstances, by using low ash in the conventional lightweight aggregate soundproofing panel to recycle the waste to conserve the environment, and to replace the low weight aggregate to secure the low demand large demand place It is an object of the present invention to provide a sound-absorbing soundproof panel using a lightweight aggregate and a method of manufacturing the same.

In addition, the present invention is to provide a sound-absorbing soundproof panel using a low-weight light aggregate that can be reduced in price of the product by using low ash in place of the light aggregate, the material supply schedule and product production schedule and its manufacturing method There is this.

Method for producing a sound-absorbing soundproof panel using the low-weight lightweight aggregate of the present invention for achieving the above object is a mixture preparation step of mixing the light aggregate, binder, water and water-reducing agent embedded in the ashing plant as a by-product of the power plant, and prepared A sound absorbing material manufacturing step comprising a mold injection step of injecting the mixture into the mold, a curing step of curing the mixture injected into the mold, and a mold separation step of separating the indoor-cured mixture from the mold; and concrete or zinc in the sound absorbing material. It is made, including;

The lightweight aggregate is a bottom ash screened with a particle size of 1.25-5mm among the embedded bottom ash, the binder is based on cement, the reducing agent is characterized in that the polycarboxylic acid-based, melamine-based or naphthalene-based.

In addition, the mixture preparation step is a dry beam of the binder and the light weight aggregate for 30-180 seconds to mix, the water-absorbing type using the low-weight lightweight aggregate characterized in that the water and the high-performance water-absorbing agent is beamed for 30-180 seconds and then injected into the mold Provided is a method for manufacturing a soundproof panel.

And the mixture preparation step is characterized in that the mixture of the volume ratio 45-55% lightweight aggregate and the volume ratio 25-35% of the binder, the water 20 to 20% by volume ratio, and a high-performance water reducing agent to a volume ratio of 1% of water Provided is a method for manufacturing a sound absorbing soundproof panel using light weight aggregates.

In particular, the binder provides a method for producing a sound-absorbing soundproof panel using low ash lightweight aggregate, characterized in that by using a general Portland cement 85-95% by volume ratio and fly ash in a 5-15% volume ratio.

In addition, the sound-absorbing material connection step is a sound-absorbing soundproof panel using a low-weight lightweight aggregate, characterized in that the sound-absorbing material is composed of a sound absorbing layer of 80-120mm on one side or both sides, and composed of 50-120mm thick concrete embedded with a wire mesh as sound insulation It provides a method of manufacturing.

And the sound insulating material connection step is composed of a sound absorbing material to form a sound absorbing layer of 40-70mm thickness, the sound-absorbing material is formed by partially bending the 1.2-1.6mm thick galvanized steel sheet to form an air layer of 40-70mm thickness inside Provided is a method for producing a sound-absorbing soundproof panel using low ash lightweight aggregate.

On the other hand, the first embodiment of the sound-absorbing soundproof panel using the low-weight lightweight aggregate is a mixture of 45-55% light weight aggregate and 25-35% volume ratio binder, 20-25% water by volume ratio, and a high performance water reducing agent Sound absorption material composed by mixing at 1% by volume ratio constitutes the sound absorbing layer (3) of 80-120mm on one side or both sides, consisting of 50-120mm thick concrete (1) embedded with wire mesh (2) as sound insulation material, The lightweight aggregate is a bottom ash screened with a particle size of 1.25-5mm among the embedded bottom ash, the binder is based on cement, the reducing agent is characterized in that the polycarboxylic acid-based, melamine-based or naphthalene-based.

In addition, the second embodiment of the sound-absorbing soundproof panel using low ash lightweight aggregate is a mixture of 45-55% light weight aggregate and 25-35% volume ratio binder, 20-25% water by volume, and a high performance water-reducing agent 40-70mm thick sound absorbing layer 13 is composed of sound absorbing material composed by mixing at 1% by volume ratio, and 1.2-1.6mm thick galvanized steel sheet 11 is partially bent with sound insulating material to make air layer 40-70mm thick inside. (12), wherein the lightweight aggregate is a bottom ash screened with a particle size of 1.25-5mm among the bottom ash buried, the binder is mainly composed of cement, the sensitizer is polycarboxylic acid or melamine series or naphthalene It is characterized by being a series.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a method for manufacturing a lightweight aggregate soundproof panel according to the present invention, Figure 2 is a particle size curve of the bottom ash used in the production of a lightweight aggregate soundproof panel according to the present invention, Figures 3a to 3c is the present invention Figure 4 is a cross-sectional state diagram of the samples 1, 2, 3 of the lightweight aggregate soundproofing panel according to the present invention, Figures 4a and 4b is a cross-sectional state view of the first embodiment of the lightweight aggregate soundproofing panel according to the present invention, Figure 5 is the present invention according to the present invention Sectional view of the second embodiment of the lightweight aggregate soundproofing panel according to the present invention.

As shown in the drawings, the method of manufacturing a sound absorbing soundproof panel using low ash lightweight aggregate according to the present invention is divided into a sound absorbing material manufacturing step and a sound insulating material connection step, the first step of the sound absorbing material manufacturing step is a mixture preparation step, ash ash bottom ash 1.25-5mm light aggregate, binder, water and water reducing agent is the step of mixing.

In addition, in the mixture preparation step, the binder and the light aggregate are dry-beamed for 30-180 seconds, and the water and a high-performance sensitizer are added for 30-180 seconds, and then injected into the mold.

In addition, the mixture preparation step is a mixture of 45% to 55% by volume light aggregate and 25% to 35% by volume of binder, and 20-25% of water by volume, a high performance water reducing agent is mixed by 1% by volume of water, and the binder is general Portland. This is achieved by using 85-95% cement by volume and 5-15% fly ash.

Lightweight aggregate is a bottom ash selected by the particle size of 1.25-5mm among bottom ash embedded in the ash refinery as a by-product of power plant, and the binder is composed mainly of cement. The reducing agent is a product of the polycarboxylic acid series, melamine series, naphthalene series commonly used. The purpose of the water reducing agent is not to have a direct effect on the sound absorption rate performance of the product called soundproof walls, but to reduce the amount of water used to increase the strength of the product itself. Therefore, any product water reducing agent can be used.

The next step is a mold injection step of injecting the prepared mixture into the mold, and a curing step of curing the mixture injected into the mold, and the next step is a mold separation step of separating the indoor cured mixture from the mold.

On the other hand, the sound insulating material connection step is a step of connecting the concrete or galvanized steel plate to the sound absorbing material, the first embodiment of the sound insulating material connection step comprises a sound absorbing layer of 80-120mm in one or both sides as the sound absorbing material, the wire mesh is embedded as sound insulation Step is to construct 50-120mm thick concrete.

In addition, the second embodiment of the sound insulating material connection step is to form a sound absorbing layer of 40-70mm thickness as the sound absorbing material, and to form a 40-70mm thick air layer on the inside by partially bending the galvanized steel sheet of 1.2-1.6mm thickness as the sound insulating material Step.

The low ash used in the present invention is obtained by extracting 1.25-5mm aggregate from the by-product of the coal briquette thermal power plant, and the content having a particle size of 1.25-5mm as shown in the particle size curve of FIG. It can be seen that the volume ratio is about 35% of the refined coal ash. Figure 2 shows the particle size curve of the bottom ash collected from the Seocheon thermal power plant among domestic thermal power plants, it can be seen the possibility of extraction and utilization of aggregate.

The following is a description of the compound test using the lightweight aggregate extracted from the bottom ash.

In this formulation, fly ash was used as cement and cement substitute for cement, and aggregate was used as bottom ash, an unrefined coal ash from domestic power plants, and experiments were conducted for each particle size of aggregate to secure voids. In addition, small amount of high performance water reducing agent was added, and the amount of use was changed to secure the quality characteristics of the porous concrete. Experimental levels for porous concrete are shown in Table 4 below.

Table 4. Experimental Level of Porous Concrete

division Aggregate particle size (mm) W / B (% by volume) Porosity (% by volume) Fly Ash Replacement Rate (% Volume) Curing method Comparative Example 1 5 mm or more 2.5 to 5 mm 1.25 to 2.5 mm 5 mm or less 20 25 35 45 20 35 50 65 0 Underwater Curing (20 ± 3 ℃) A 5 B 10 C 15

In this experiment, the experimental goal was 20 ~ 65% of porosity, water binding material ratio was 20 ~ 25%, and aggregate particle size was 4 level or more. It was. In addition, high performance water reducing agent was used within 1% to secure the quality characteristics of the porous concrete. Herein, the water binder ratio refers to the ratio of water (W) to binder (B) in weight ratio.

Table 5. Example of Experimental Blend

division Aggregate particle size (mm) Water binding material ratio (% by volume) Porosity (% by volume) Unit quantity (㎏ / ㎥) Unit volume (ℓ / ㎥) Unit weight (㎏ / ㎥) Binder aggregate Binder aggregate A B C D 5 mm or more 2.5 to 5 mm 1.25 to 2.5 mm 5 mm or less 20 25 35 45 20 35 50 65 40-131 51-166 91-296 153-497 1469-1557

Cement and fly ash were used as binders in this experiment, and cement was used as ordinary Portland cement produced in Korea. Fly Ash used what is produced in Central Korea's power generation. Table 6 below shows the chemical properties of the binder and Table 7 shows the physical properties of the binder.

Table 6. Chemical Properties of Binders / Table 7. Physical Properties of Binders (Unit: wt%)

division SiO ₂ AL ₂ O ₃ Fe ₂ O ₃ CaO MgO Na ₂ O K ₂ O SO ₃ LOI Cl (ppm) cement 20.7 6.2 3.2 63.6 2.2 0.11 0.81 1.91 - - Fly ash 49.5 29.9 4.7 0.6 0.6 0.0 3.8 0.1 9.0

Test Items Condensation time (Gillmore test) Compressive strength (kgf / cm ² ) Stability Powder level (cm ² / g) importance First minute Termination (hour: minute) cement 259 6:39 28th 382 0.07 3304 3.15 Fly ash - - - - 1940 2.0

The aggregate used in the porous concrete was tested by separating the bottom ash, which is an unrefined coal ash produced in Korea, by the particle size of the aggregate. In terms of the particle size of the bottom ash aggregate, it accounts for 5 mm or more (6.24%), 2.5 to 5 mm (21.34%), 1.25 to 2.5 mm (25.87%), and 0.6 to 1.25 mm (13.48%). Table 8 shows the chemical properties of the aggregates.

Table 8. Chemical Properties of Aggregates

Sample Name SiO₂ Al₂O₃ Fe₂O₃ CaO MgO K₂O SO₃ TiO₂ Ig-loss Na₂O Bottom Ash (Unscreened) 47.7 25.1 5.7 0.6 0.7 3.3 0.1 1.4 15.3 0.0 Bottom ash (selected) 55.4 23.9 5.6 0.6 0.6 3.7 0.1 1.2 8.9 0.0

To explain this test method, the biblim of the porous concrete was used a forced pan-type mixer with a capacity of 100ℓ.In order to coat the cement evenly around the aggregate, the cement and aggregate were first put into the beam for 60 seconds, followed by water and a high performance water reducing agent. Was added and bibeamed.

In addition, considering the workability of the porous concrete, the high-performance water reducing agent was added to the volume ratio of 1% or less to complete the bibeam, and the bibeam time was set to be within 120 seconds.

And the preparation of the test agent was carried out 25 times after the filling of the required mold 1/2, repeated two times, and then finished by producing the top surface. After fabrication of specimens, the specimens were allowed to stand in a room of 20 ± 2 ° C., and after 24 hours of standing, the specimens were demolded and cured until a predetermined measurement age.

The specific gravity of the test results using light aggregates is 1.0 ~ 1.2, and the compressive strength is 50 ~ 300kgf / ㎠ level depending on the used materials such as the particle size, aggregate type, cement type, etc. have.

Tensile strength of 5kgf / ㎠ is shown in this test result. Tensile strength is 1/7 ~ 1/14 compared with compressive strength and is usually larger than the value of tensile / compressive strength of concrete.

The flexural strength is shown to be 10 ~ 50kgf / ㎠, and it is considered that there is a linear relationship with the porosity and the compressive strength regardless of the particle size of aggregate.

In addition, based on the results of the blending test made the sound absorbing material of the object of the present invention, the results of the acoustic performance on the sound absorption rate is as follows. The sound absorbing material was made into three types. Sample 1 was made with only 50 mm thick panels to see sound absorption performance at base thickness.

Sample 2 was designed to test the acoustic performance by giving 50mm of air layer behind the 50mm lightweight aggregate panel, focusing on the development of light weight products such as products installed on bridges.

Sample 3 was experimented by making a convex-shaped panel with a virtual product that is not restricted in weight, such as earthwork.

Table 9. Thickness of Sound Absorbing and Air Layers in Samples

Sound absorption layer thickness (mm) Air layer thickness (mm) Sample 1 50 (flatbed) 0 Sample 2 50 (flatbed) 50 Sample 3 70 (unevenness) +40 (flat plate) 0

In order to evaluate the sound absorption of the lightweight aggregates by making three panel objects manufactured as shown in FIGS. 3A to 3C, a test was performed according to KS F 2805 (absorption rate measurement method in the reverberation chamber) in the reverberation chamber.

Table 10. Octave band frequency and average sound absorption of samples

1/1 octave band frequency (Hz) Average Sound Absorption Rate (NRC) 125 250 500 1k 2k 4k Sample 1 0.14 0.28 0.55 0.7 0.65 0.59 0.55 Sample 2 0.16 0.37 0.82 0.88 0.71 0.59 0.70 Sample 3 0.19 0.45 0.94 0.99 0.85 0.60 0.81

In the soundproof wall specification of the road construction, the minimum standard of sound absorption is set to NRC 0.7 or higher, and the sound absorbing wall related industrial standards such as KSF set the minimum sound absorption rate to NRC 0.7 or higher, so that the samples 2 and 3 can be used as soundproof walls. Judging.

On the other hand, the first embodiment of the sound-absorbing soundproof panel using the low-weight lightweight aggregate manufactured by the method of manufacturing a sound-absorbing soundproof panel using the low-weight lightweight aggregate according to the present invention as described above is 45-55% light weight aggregate and volume ratio 25 A sound absorbing material composed of -35% binder and water at a volume ratio of 20-25%, and a high performance water-reducing agent mixed at a volume ratio of 1% of water to form a sound absorbing layer (3) of 80-120 mm on one or both sides. Furnace wire mesh (2) is made by constructing a concrete (1) of 50-120mm thickness embedded.

In more detail, in the earthwork section, the load of the soundproof wall itself does not have a problem of being heavy or light when the soundproof wall is installed. Therefore, it is economical design to maximize the size of the sound insulation board by widening the strut spacing. At this time, the sound insulation board should be able to withstand the horizontal load caused by the wind. Therefore, the thickness of the concrete (1) should be made according to the width of the soundproof wall.

In particular, in order to increase the bending strength is put between the reinforcement or wire mesh wire mesh (2) between the concrete to increase the tensile strength. Concrete will also play the role of sound insulation.

The minimum criterion for the sound insulation performance of soundproof walls requires more than 25dB at 500Hz in road construction or KS, but it is not a problem because sound insulation of 35dB or more is possible even if the minimum thickness of concrete (1) is only 50mm.

Therefore, by using the back panel as a concrete (1) in the light weight aggregate soundproof plate to play a role as a structural material and the sound insulation plate, to attach a sound absorbing layer (3) using a lightweight aggregate extracted from the bottom ash on the front to make a light weight aggregate soundproof soundproof plate Will be.

In addition, the sound absorption layer 3 can be attached to one or both when centering on concrete. If both sides are attached to both sides of the soundproof wall and there is only one side of the road, it can be used in various ways by attaching only one side in the direction of the road surface.

On the other hand, the second embodiment of the sound-absorbing soundproof panel using low-weight lightweight aggregate is a mixture of 45-55% light weight aggregate and 25-35% volume ratio binder, water is mixed at a volume ratio of 20-25%, and a high performance water reducing agent is used as 40-70mm thick sound absorbing layer 13 is composed of sound absorbing material composed by mixing by volume ratio, and 1.2-1.6mm thick galvanized steel sheet 11 is partially bent and the air layer 40-70mm thick inside ( 12) is made up.

In detail, the noise barrier specification of the road construction limits the distance between the soundproof wall struts in the bridge section to 2m because the wind load acts as a concentrated load on the bridge structure through the struts of the soundproof wall. Because.

In addition, it is impossible to use products with a heavy weight of soundproof panels. Therefore, instead of heavy concrete on the back side is to use a metal plate.

In the general metal-type sound-absorbing soundproof plate, the galvanized steel sheet plays a role of sound insulation material, so that the galvanized steel sheet 11 also serves to withstand wind loads at the same time as the sound insulation material.

Lightweight aggregate sound-absorbing layer (13) is sandwiched between the galvanized steel sheet so as not to fall off in the wind. The galvanized steel sheet partially bends to form the rear air layer 12 and at the same time serves as a support for the light weight aggregate sound absorbing layer 13.

As described above, the present invention can make a lightweight aggregate soundproofing panel replacing the conventionally imported lightweight aggregate by utilizing the light weight and porosity of the aggregate obtained through sieving at the bottom ash, and using the lightweight aggregate extracted from the bottom ash back panel It can provide the effect of making lightweight lightweight soundproof panels that can be used in bridge sections by combining with non-concrete metal plates.

Claims (2)

Lightweight aggregate of 45-55% by volume and 25-35% by volume of binder are mixed, water is mixed by 20-25% by volume, and the high-performance water absorber is mixed by 1% by volume of water. 80-120mm of sound-absorbing layer (3), comprising a sound-proof material consisting of a concrete (1) of 50-120mm thickness embedded with reinforcing bars or wire mesh wire mesh (2), The lightweight aggregate is a bottom ash selected by a particle size of 1.25-5mm among the bottom ash buried, the binder is composed of cement and fly ash, the reducing agent is characterized in that the polycarboxylic acid-based or melamine-based or naphthalene-based Sound-absorbing soundproof panel using light weight aggregate. 40-70mm thickness using sound absorber composed of 45 ~ 55% of volume aggregate and 25 ~ 35% of binder of volume, 20-25% of water, and 1% of water. A sound absorbing material comprising a sound absorbing layer 13, and partially bending a 1.2-1.6 mm thick galvanized steel sheet 11 to form an air layer 12 having a thickness of 40-70 mm. The lightweight aggregate is a bottom ash selected by a particle size of 1.25-5mm among the bottom ash buried, the binder is composed of cement and fly ash, the reducing agent is characterized in that the polycarboxylic acid-based or melamine-based or naphthalene-based Sound-absorbing soundproof panel using light weight aggregate.

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