Phosphogypsum noise barrier plate

Abstract

The utility model discloses an ardealite noise barrier plate, and relates to the technical field of road engineering. A plurality of first concave holes are formed in the surface of the side, close to the road, of the ardealite noise barrier plate at intervals, first micro holes and second micro holes are formed in the ardealite noise barrier plate, and the hole diameter of the first concave holes is larger than that of the first micro holes; and the aperture of the first micropores is larger than that of the second micropores. The first concave holes, the first micropores and the second micropores which are different in aperture are formed, and the aperture of the first micropores is larger than that of the second micropores, so that absorption of low-frequency sound waves can be improved through the first concave holes, absorption of medium-frequency sound waves can be improved through the first micropores, and absorption of high-frequency sound waves can be improved through the second micropores; furthermore, broadband sound absorption is achieved through the multi-stage pore structure, the noise reduction coefficient of the phosphogypsum noise barrier plate is increased, and the sound absorption effect of the phosphogypsum noise barrier plate is improved.

Description

Technical Field

[0001] This application relates to the field of road engineering technology, and in particular to a phosphogypsum noise barrier board. Background Technology

[0002] Phosphogypsum is a solid waste produced by the phosphorus chemical industry. It is a powdery solid waste with poor plasticity. Due to its lightweight properties, it is favored by the building materials industry. For example, phosphogypsum is prepared into phosphogypsum ceramsite or phosphogypsum building materials board.

[0003] However, due to its poor sound absorption, phosphogypsum often produces unsatisfactory sound absorption when used in noise barrier panels, affecting its usability. Summary of the Invention

[0004] This application provides a phosphogypsum noise barrier board to improve the sound absorption effect of the phosphogypsum noise barrier board.

[0005] In a first aspect, this application provides a phosphogypsum noise barrier board, wherein the surface of the phosphogypsum noise barrier board on the side closest to the road has a plurality of spaced-apart first recesses, and the interior of the phosphogypsum noise barrier board has first micropores and second micropores, wherein:

[0006] The diameter of the first concave hole is larger than the diameter of the first micropore;

[0007] The diameter of the first micropore is larger than the diameter of the second micropore.

[0008] This application utilizes a multi-level porous structure to achieve broadband sound absorption by setting first concave holes, first micropores, and second micropores with different apertures, wherein the aperture of the first micropore is larger than that of the second micropore. The first concave hole enhances the absorption of low-frequency sound waves, the first micropore enhances the absorption of mid-frequency sound waves, and the second micropore enhances the absorption of high-frequency sound waves. This multi-level porous structure improves the noise reduction coefficient and sound absorption effect of the phosphogypsum noise barrier board. Furthermore, the mutual support between the multi-level pores reduces the risk of cracking caused by temperature changes.

[0009] In some embodiments, 1cm≤D1≤2cm, the aperture of the first concave hole is within this range, which can improve the absorption of sound waves with frequencies between 250 and 1000Hz by the phosphogypsum noise barrier board.

[0010] In some embodiments, 0.1mm≤D2≤5mm, the pore size of the first micropore is within this range, which can improve the absorption of sound waves with frequencies between 800 and 2000Hz by the phosphogypsum noise barrier board.

[0011] In some embodiments, 1μm≤D3≤50μm, the pore size of the second micropore is within this range, which can improve the absorption of sound waves with frequencies above 1500Hz by the phosphogypsum noise barrier board.

[0012] In some embodiments, the spacing between adjacent first recesses is 3–5 cm. This spacing range allows for both sound absorption and reduced impact of the openings on the strength of the phosphogypsum noise barrier. It should be noted that the first recesses are typically centimeter-sized, formed by creating multiple protrusions on one side of a pre-set mold during concrete molding, resulting in multiple first recesses on the surface of the noise barrier after demolding.

[0013] In some embodiments, the area of ​​the first concave hole on the side surface of the phosphogypsum noise barrier board accounts for 20% to 30%. This area ratio of the first concave hole on the side surface of the phosphogypsum noise barrier board can further enhance sound absorption while reducing the impact of the opening on the strength of the phosphogypsum noise barrier board.

[0014] The materials of the phosphogypsum noise barrier panel include phosphogypsum, cement, slag powder, fly ash, water-reducing agent, fiber, and waterproofing agent. Phosphogypsum has poor water resistance; the addition of waterproofing agent and slag powder can increase the softening coefficient of the phosphogypsum ceramsite, improve the hydrophilicity of the pore surface, and result in high strength retention after long-term water immersion. It can also reduce the erosion of the internal structure by environmental humidity, extending its service life. Fiber and cement can compensate for the weakening effect of surface pores on the strength of the phosphogypsum noise barrier panel, thereby improving its overall strength.

[0015] The mass ratio of phosphogypsum, cement, slag powder, fly ash, water-reducing agent, fiber, and waterproofing agent is (50-70):(5-10):(5-10):(3-5):(0.3-0.8):(0.1-0.3):(20-30). Within this range, the mass ratio of phosphogypsum, cement, slag powder, fly ash, water-reducing agent, fiber, and waterproofing agent can balance the strength and service life of the phosphogypsum noise barrier board.

[0016] The water-reducing agent includes at least one of polycarboxylic acid, methyl polycarboxylic acid, ethyl acetate polycarboxylic acid, and chlorinated polycarboxylic acid. Using at least one of the above water-reducing agents can disperse phosphogypsum particles, improve their workability, reduce the unit water consumption of the mixture, and improve the fluidity of the mixture.

[0017] The fiber includes at least one of glass fiber, polypropylene fiber and metal fiber. Using at least one of the above fibers can improve the strength of the phosphogypsum noise barrier board and extend its service life.

[0018] The waterproofing agent includes at least one of sodium methylsiloxane, silicone resin, and emulsified silicone oil. Using at least one of the above waterproofing agents can increase the softening coefficient of phosphogypsum ceramsite, improve the hydrophilicity of the pore surface, maintain high strength retention after long-term water immersion, reduce the erosion of the internal structure by environmental humidity, and extend service life.

[0019] The phosphogypsum comprises modified phosphogypsum powder and phosphogypsum particles, wherein: the mass ratio of modified phosphogypsum powder to phosphogypsum particles is (1.7–3.5):1. Within this mass ratio, the board possesses both good sound absorption and structural load-bearing capacity. The phosphogypsum particles have a particle size of 1–5 mm. Within this particle size range, they can serve as aggregate for the board, improving its strength and reducing its weight. The modified phosphogypsum powder has a particle size of 5–50 μm. Within this particle size range, it can act as a cementing material, improving the board's durability and molding efficiency. The modified phosphogypsum powder includes β-type hemihydrate phosphogypsum, which can enhance the cementing activity of the board. The modified phosphogypsum powder has a moisture content of 20–25%. Within this moisture content range, it can improve its cementing effect and reduce environmental pollution.

[0020] Phosphogypsum granules can be prepared from building phosphogypsum powder using a disc granulator without firing. Their porosity and non-uniformity cause sound waves to scatter when they encounter the phosphogypsum particles, thus weakening the sound wave intensity and achieving a sound insulation effect. Irregular pores are formed inside the phosphogypsum particles due to moisture evaporation and particle accumulation. The pore size is 1-5mm, which is the source of the first micropores. This also reduces the density and weight of the phosphogypsum noise barrier board. Furthermore, this microporous structure of this size absorbs mid-frequency sound waves of 800-2000Hz through resonance.

[0021] Modified phosphogypsum powder is usually produced by calcining phosphogypsum at a high temperature of 400-600℃, and then partially removing gypsum dihydrate (CaSO₄). 4· 2H2O) dehydrates to form hemihydrate gypsum (CaSO4). 4· 0.5H2O) forms a porous structure with micropores typically ranging from 1 to 100 μm in size, which is the source of the second micropores. This can provide the specific surface area inside the phosphogypsum noise barrier board and enhance the bonding force of the cementitious material. The second micropore structure can also enhance the strength of the phosphogypsum noise barrier board through the "skeleton effect". At the same time, the second micropore structure has a good absorption effect on high-frequency sound waves (above 1500 Hz).

[0022] In some embodiments, since the first concave hole is formed on the surface of the phosphogypsum noise barrier plate, and the first micropore is located between different phosphogypsum particles inside the phosphogypsum noise barrier plate, some of the first micropores can communicate with some of the first concave holes to form a Helmholtz resonant cavity, further improving the absorption effect of low-frequency sound waves of 250-1000Hz.

[0023] Specifically, modified phosphogypsum powder, cement, slag powder, fly ash, waterproofing agent, and fiber can be dry-mixed for 3 minutes according to the specified ratio. Then, a water-reducing agent is added and wet-mixed with water for 5 minutes. Finally, phosphogypsum granules are added and stirred for 2 minutes. The slurry is extruded into a mold using a twin-screw extruder (pressure 10–15 MPa), simultaneously pressing an array of 2 cm diameter holes with a 5 cm spacing onto the surface of the plate. Curing at room temperature for 1 day, or steam curing (60℃, 24 hours) accelerates hardening.

[0024] In some embodiments, the volume ratio of the first micropore in the phosphogypsum noise barrier plate is 5-15%. Within this range, the phosphogypsum noise barrier plate can absorb sound waves with frequencies between 800 and 2000 Hz while reducing the density of the phosphogypsum noise barrier plate.

[0025] In some embodiments, the volume percentage of the second micropores in the phosphogypsum noise barrier is 25-35%. Within this range, the volume percentage of the second micropores in the phosphogypsum noise barrier can balance the absorption of sound waves above 1500Hz while reducing the density of the phosphogypsum noise barrier.

[0026] Meanwhile, when the volume ratio of the first micropore and the volume ratio of the second micropore are both satisfied within the above range, a framework micropore can be formed through micropores of multi-level pore size, which can reduce the density of the phosphogypsum noise barrier board while increasing its strength.

[0027] In some embodiments, the density of the phosphogypsum noise barrier board is 1000 kg / m³. 3 ~1200kg / m 3 The density of the phosphogypsum noise barrier board is within this range, which allows for sufficient porosity inside the board, improving noise absorption, and also facilitating transportation and installation. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a front structural schematic diagram of a phosphogypsum noise barrier panel according to an embodiment of this application.

[0030] Figure 2 This is a side view of a phosphogypsum noise barrier panel according to an embodiment of this application.

[0031] Explanation of icon numbers:

[0032] 100 phosphogypsum noise barrier board; 1 first concave hole. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] Phosphogypsum is a solid waste produced by the phosphorus chemical industry. It is a powdery solid waste with poor plasticity. Due to its lightweight properties, it is favored by the building materials industry. For example, phosphogypsum is prepared into phosphogypsum ceramsite or phosphogypsum building materials board.

[0035] However, due to its poor sound absorption, phosphogypsum often produces unsatisfactory sound absorption when used in noise barrier panels, affecting its usability.

[0036] In view of this, this application provides a phosphogypsum noise barrier board to improve the sound absorption effect of the phosphogypsum noise barrier board.

[0037] Firstly, such as Figure 1 and Figure 2 As shown, this application provides a phosphogypsum noise barrier board 100. The surface of the phosphogypsum noise barrier board 100 near the road has a plurality of spaced-apart first recesses 1. The interior of the phosphogypsum noise barrier board 100 has first micropores and second micropores, wherein:

[0038] The diameter of the first concave hole 1 is larger than the diameter of the first micropore;

[0039] The diameter of the first micropore is larger than the diameter of the second micropore.

[0040] This application, by setting a first concave hole 1, a first micropore, and a second micropore with different apertures, and wherein the aperture of the first micropore is larger than that of the second micropore, can improve the absorption of low-frequency sound waves through the first concave hole 1, improve the absorption of mid-frequency sound waves through the first micropore, and improve the absorption of high-frequency sound waves through the second micropore. This multi-level porous structure achieves broadband sound absorption, improves the noise reduction coefficient of the phosphogypsum noise barrier board 100, and enhances its sound absorption effect. Simultaneously, the mutual support of the multi-level pores can also reduce the risk of cracking caused by temperature changes.

[0041] In conjunction with the first aspect, in some embodiments provided in this application, 1cm≤D1≤2cm, the aperture of the first concave hole 1 is within this range, which can improve the absorption of sound waves with frequencies between 250 and 1000Hz by the phosphogypsum noise barrier board 100.

[0042] In conjunction with the first aspect, in some embodiments provided in this application, 0.1mm≤D2≤5mm, the pore size of the first micropore is within this range, which can improve the absorption of sound waves with frequencies between 800 and 2000Hz by the phosphogypsum noise barrier board 100.

[0043] In conjunction with the first aspect, in some embodiments provided in this application, 1μm≤D3≤50μm, the pore size of the second micropore is within this range, which can improve the absorption of sound waves with frequencies above 1500Hz by the phosphogypsum noise barrier board 100.

[0044] In conjunction with the first aspect, in some embodiments provided in this application, the spacing between adjacent first recesses 1 is 3-5 cm. This spacing range allows for both sound absorption and reduced impact of the openings on the strength of the phosphogypsum noise barrier board 100. It should be noted that the first recesses 1 are typically centimeter-sized recesses, formed by creating multiple protrusions on one side of a pre-set mold during concrete molding, resulting in multiple first recesses 1 on the surface of the noise barrier board after demolding.

[0045] In conjunction with the first aspect, in some embodiments provided in this application, the area ratio of the first concave hole 1 on the side surface of the phosphogypsum noise barrier plate 100 is 20% to 30%. With the area ratio of the first concave hole 1 on the side surface of the phosphogypsum noise barrier plate 100 within this range, the sound absorption effect can be further considered, while reducing the impact of the opening on the strength of the phosphogypsum noise barrier plate 100.

[0046] In conjunction with the first aspect, in some embodiments provided in this application, the material of the phosphogypsum noise barrier board 100 includes phosphogypsum, cement, slag powder, fly ash, water-reducing agent, fiber, and waterproofing agent. Phosphogypsum has poor water resistance; adding waterproofing agent and slag powder can increase the softening coefficient of the phosphogypsum ceramsite, improve the hydrophilicity of the pore surface, maintain high strength retention after long-term water immersion, and reduce the erosion of the internal structure by environmental humidity, thus extending its service life. Fiber and cement can compensate for the weakening effect of surface pores on the strength of the phosphogypsum noise barrier board 100, thereby improving its strength.

[0047] In conjunction with the first aspect, in some embodiments provided in this application, the mass ratio of phosphogypsum, cement, slag powder, fly ash, water-reducing agent, fiber, and waterproofing agent is (50-70):(5-10):(5-10):(3-5):(0.3-0.8):(0.1-0.3):(20-30). This mass ratio of phosphogypsum, cement, slag powder, fly ash, water-reducing agent, fiber, and waterproofing agent is within this range, which can balance the strength and service life of the phosphogypsum noise barrier panel 100.

[0048] In conjunction with the first aspect, in some embodiments provided in this application, the water-reducing agent includes at least one of polycarboxylic acid, methyl polycarboxylic acid, ethyl acetate polycarboxylic acid, and chlorinated polycarboxylic acid. Using at least one of the above water-reducing agents can disperse phosphogypsum particles, improve their workability, reduce the unit water consumption of the mixture, and improve the fluidity of the mixture.

[0049] In conjunction with the first aspect, in some embodiments provided in this application, the fiber includes at least one of glass fiber, polypropylene fiber and metal fiber. Using at least one of the above fibers can improve the strength of the phosphogypsum noise barrier board 100 and increase its service life.

[0050] In conjunction with the first aspect, in some embodiments provided in this application, the waterproofing agent includes at least one of sodium methylsiloxane, silicone resin, and emulsified silicone oil. Using at least one of the above waterproofing agents can increase the softening coefficient of phosphogypsum ceramsite, improve the hydrophilicity of the pore surface, maintain high strength retention after long-term water immersion, reduce the erosion of the internal structure by environmental humidity, and extend service life.

[0051] In conjunction with the first aspect, in some embodiments provided in this application, the phosphogypsum includes modified phosphogypsum powder and phosphogypsum particles, wherein the mass ratio of modified phosphogypsum powder to phosphogypsum particles is (1.7 to 3.5):1. Within this range, the mass ratio of modified phosphogypsum powder to phosphogypsum particles can enable the board to have both good sound absorption effect and structural load-bearing function.

[0052] In conjunction with the first aspect, in some embodiments provided in this application, the phosphogypsum includes modified phosphogypsum powder and phosphogypsum particles, wherein: the particle size of the phosphogypsum particles is 1-5 mm. The particle size of the phosphogypsum particles within this range can be used as aggregate for boards to improve the strength of the boards and reduce the self-weight of the boards.

[0053] In conjunction with the first aspect, in some embodiments provided in this application, the phosphogypsum includes modified phosphogypsum powder and phosphogypsum particles, wherein: the particle size of the modified phosphogypsum powder is 5-50 μm. The particle size of the modified phosphogypsum powder within this range can act as a cementing material, improving the durability and molding efficiency of the board.

[0054] In conjunction with the first aspect, in some embodiments provided in this application, the phosphogypsum includes modified phosphogypsum powder and phosphogypsum particles, wherein: the modified phosphogypsum powder includes β-type hemihydrate phosphogypsum, which can improve the gelling activity of the board.

[0055] In conjunction with the first aspect, in some embodiments provided in this application, the phosphogypsum includes modified phosphogypsum powder and phosphogypsum particles, wherein: the moisture content of the modified phosphogypsum powder is 20-25%. The moisture content of the modified phosphogypsum powder within this range can improve its gelling effect and reduce environmental pollution.

[0056] Phosphogypsum granules can be prepared from building phosphogypsum powder using a disc granulator without firing. Their porosity and non-uniformity cause sound waves to scatter when they encounter the phosphogypsum granules, thus weakening the sound wave intensity and achieving a sound insulation effect. Irregular pores are formed inside the phosphogypsum granules due to moisture evaporation and particle accumulation. The pore size is 1-5mm, which is the source of the first micropores. This also reduces the density of the phosphogypsum noise barrier board 100, reducing weight. Furthermore, this microporous structure of this size absorbs mid-frequency sound waves of 800-2000Hz through resonance.

[0057] Modified phosphogypsum powder is usually produced by calcining phosphogypsum at a high temperature of 400-600℃, and then partially removing gypsum dihydrate (CaSO₄). 4· 2H2O) dehydrates to form hemihydrate gypsum (CaSO4). 4· 0.5H2O) forms a porous structure with micropores typically ranging from 1 to 100 μm in size, which is the source of the second micropores. This can provide the specific surface area inside the phosphogypsum noise barrier board 100, enhance the bonding force of the cementitious material, and the second micropore structure can also enhance the strength of the phosphogypsum noise barrier board 100 through the "skeleton effect". At the same time, the second micropore structure has a good absorption effect on high-frequency sound waves (above 1500 Hz).

[0058] In some embodiments, since the first concave hole 1 is formed on the surface of the phosphogypsum noise barrier plate 100, and the first micropore is located between different phosphogypsum particles inside the phosphogypsum noise barrier plate 100, some of the first micropores can communicate with some of the first concave holes 1 to form a Helmholtz resonant cavity, thereby further improving the absorption effect of low-frequency sound waves of 250 to 1000 Hz.

[0059] Specifically, modified phosphogypsum powder, cement, slag powder, fly ash, waterproofing agent, and fiber can be dry-mixed for 3 minutes according to the specified ratio. Then, a water-reducing agent is added and wet-mixed with water for 5 minutes. Finally, phosphogypsum granules are added and stirred for 2 minutes. The slurry is then extruded into a mold using a twin-screw extruder (pressure 10–15 MPa), simultaneously pressing an array of 2 cm diameter holes with a 5 cm spacing onto the surface of the plate. Curing at room temperature for 1 day, or steam curing (60℃, 24 hours) accelerates hardening.

[0060] In conjunction with the first aspect, in some embodiments provided in this application, the volume ratio of the first micropores in the phosphogypsum noise barrier plate 100 is 5-15%. The volume ratio of the first micropores in the phosphogypsum noise barrier plate 100 within this range can take into account the absorption of sound waves with frequencies between 800 and 2000 Hz by the phosphogypsum noise barrier plate 100, while reducing the density of the phosphogypsum noise barrier plate 100.

[0061] In conjunction with the first aspect, in some embodiments provided in this application, the volume percentage of the second micropores in the phosphogypsum noise barrier plate 100 is 25% to 35%. Within this range, the volume percentage of the second micropores in the phosphogypsum noise barrier plate 100 can simultaneously absorb sound waves with frequencies above 1500Hz while reducing the density of the phosphogypsum noise barrier plate 100.

[0062] Meanwhile, when the volume ratio of the first micropore and the volume ratio of the second micropore are both satisfied within the above range, a skeleton micropore can be formed through micropores of multi-level pore size, which can reduce the density of the phosphogypsum noise barrier board 100 while improving its strength.

[0063] In conjunction with the first aspect, in some embodiments provided in this application, the density of the phosphogypsum noise barrier board 100 is 1000 kg / m³. 3 ~1200kg / m 3 The density of the phosphogypsum noise barrier board 100 is within this range, which allows the phosphogypsum noise barrier board 100 to have sufficient pores inside, improving noise absorption, and also facilitating transportation and installation.

[0064] The technical solutions provided in this application will be described in detail below with reference to the embodiments.

[0065] Example 1

[0066] Embodiment 1 of this application provides a phosphogypsum noise barrier board. The surface of the phosphogypsum noise barrier board on the side closest to the road has multiple spaced first recesses with a diameter of 1 cm. The interior of the phosphogypsum noise barrier board has first micropores with a diameter of 0.1–5 mm and second micropores with a diameter of 1–50 μm, wherein:

[0067] The area of ​​the first concave hole on the surface of the phosphogypsum noise barrier board accounts for 20% and the interval is 3cm.

[0068] The volume percentage of the first micropore in the phosphogypsum noise barrier board is 15%.

[0069] The volume ratio of the second micropore in the phosphogypsum noise barrier board is 20%.

[0070] Example 2

[0071] Embodiment 2 of this application provides a phosphogypsum noise barrier board. The surface of the phosphogypsum noise barrier board on the side closest to the road has multiple spaced first recesses with a diameter of 1.5 cm. The interior of the phosphogypsum noise barrier board has first micropores with a diameter of 0.1–5 mm and second micropores with a diameter of 1–50 μm.

[0072] The first concave hole accounts for 25% of the area of ​​the surface of the phosphogypsum noise barrier board, and the spacing is 4cm.

[0073] The volume ratio of the first micropore in the phosphogypsum noise barrier board is 10%.

[0074] The volume ratio of the second micropore in the phosphogypsum noise barrier plate is 25%.

[0075] Example 3

[0076] Embodiment 3 of this application provides a phosphogypsum noise barrier board. The surface of the phosphogypsum noise barrier board on the side closest to the road has multiple spaced first recesses with a diameter of 2 cm. The interior of the phosphogypsum noise barrier board has first micropores with a diameter of 0.1–5 mm and second micropores with a diameter of 1–50 μm.

[0077] The area of ​​the first concave hole on the surface of the phosphogypsum noise barrier board accounts for 30%, and the interval is 5cm.

[0078] The volume percentage of the first micropore in the phosphogypsum noise barrier board is 5%.

[0079] The volume ratio of the second micropore in the phosphogypsum noise barrier board is 35%.

[0080] Comparative Example 1

[0081] Comparative Example 1 of this application provides a phosphogypsum noise barrier board, which is similar to Example 1, except that it only contains a first concave hole.

[0082] Comparative Example 2

[0083] Comparative Example 2 of this application provides a phosphogypsum noise barrier board, similar to Example 1, except that it contains only the first micropores.

[0084] Comparative Example 3

[0085] Comparative Example 3 of this application provides a phosphogypsum noise barrier board, similar to Example 1, except that it contains only a second micropore.

[0086] Comparative Example 4

[0087] Comparative Example 4 of this application provides a noise barrier board, which is a common cement sound insulation board with the same length, width and thickness as the embodiment, but without the first concave hole, the first micropore and the second micropore.

[0088] Performance testing

[0089] The phosphogypsum noise barrier boards of Examples 1 to 3 and Comparative Examples 1 to 4 were tested for density, sound absorption coefficient, sound insulation, and compressive strength. The specific test methods are as follows:

[0090] Areal density test: conducted in accordance with GB / T 30100.

[0091] Sound insulation test: conducted in accordance with GB / T 19889.3.

[0092] Sound absorption coefficient test: conducted in accordance with GB / T 20247.

[0093] Compressive strength test: conducted in accordance with the provisions of GB / T 23451.

[0094] The specific test results are shown in Table 1.

[0095] Table 1. Performance test results of noise barrier panels in Examples 1 to 4 and Comparative Examples 1 to 4

[0096]

[0097]

[0098] As shown in Table 1, the phosphogypsum noise barrier boards of Examples 1 to 3 achieve sound absorption performance for broadband noise through a variety of pore structures, including modified gypsum micropores, lightweight aggregate macropores, and surface openings, and also give the boards good mechanical strength properties.

[0099] Comparative Example 1, lacking the first concave hole, failed to increase the specific surface area of ​​the board to enhance sound wave reflection and absorption, thus exhibiting certain shortcomings in noise reduction.

[0100] Comparative Example 2, lacking the first micropore, exhibits poor absorption of mid-frequency noise.

[0101] Comparative Example 3, lacking a second micropore, exhibits poor absorption of high-frequency noise.

[0102] Comparative Example 4 uses ordinary cement sound insulation board, which has poor overall sound absorption effect.

[0103] In summary, by setting first concave holes, first micropores, and second micropores with different pore sizes, and with the diameter of the first micropore being larger than that of the second micropore, the absorption of low-frequency sound waves can be improved through the first concave holes, the absorption of mid-frequency sound waves through the first micropores, and the absorption of high-frequency sound waves through the second micropores. This multi-level porous structure achieves broadband sound absorption, improves the noise reduction coefficient of the phosphogypsum noise barrier board, and enhances its sound absorption effect. Furthermore, the mutual support of the multi-level pores can reduce the risk of cracking caused by temperature changes.

[0104] In the description of this specification, the references to terms such as "one embodiment / mode," "some embodiments / modes," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment / mode or example is included in at least one embodiment / mode or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / mode or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments / modes or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments / modes or examples described in this specification, as well as the features of different embodiments / modes or examples.

[0105] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. In this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise expressly specified.

[0106] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A phosphogypsum noise barrier board, characterized in that, The phosphogypsum noise barrier board has multiple spaced-apart first recesses on the side facing the road, and the phosphogypsum noise barrier board has first micropores and second micropores inside, wherein: The diameter of the first concave hole is larger than the diameter of the first micropore; The diameter of the first micropore is larger than the diameter of the second micropore.

2. The phosphogypsum noise barrier board as described in claim 1, characterized in that: The diameter of the first concave hole is D1, where 1cm ≤ D1 ≤ 2cm.

3. The phosphogypsum noise barrier board as described in claim 1, characterized in that: The diameter of the first micropore is D2, where 0.1mm ≤ D2 ≤ 5mm.

4. The phosphogypsum noise barrier board as described in claim 1, characterized in that: The pore size of the second micropore is D3, where 1μm≤D3≤50μm.

5. The phosphogypsum noise barrier board as described in claim 1, characterized in that, The distance between adjacent first recesses is 3 to 5 cm.

6. The phosphogypsum noise barrier board as described in claim 1, characterized in that, The area of ​​the first concave hole on the side surface of the phosphogypsum noise barrier plate accounts for 20% to 30%.

7. The phosphogypsum noise barrier board as described in claim 1, characterized in that: The volume ratio of the first micropore in the phosphogypsum noise barrier board is 5-15%.

8. The phosphogypsum noise barrier board as described in claim 1, characterized in that: The volume ratio of the second micropore in the phosphogypsum noise barrier plate is 25-35%.

9. The phosphogypsum noise barrier board as described in claim 1, characterized in that, The density of the phosphogypsum noise barrier board is 1000 kg / m³. 3 ~1200kg / m 3 .

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