Noise barrier plate

Abstract

The invention discloses a noise barrier plate, and relates to the technical field of road engineering. The noise barrier plate comprises a face plate and a back plate which are sequentially arranged, and the face plate is provided with materials of the back plate. The material of the back plate is arranged in the panel, a contact surface is formed through permeation of the material of the back plate and the material of the panel to integrate the panel and the back plate into a whole, and the slurry material of the back plate can permeate into pores of the panel, so that the bonding force is stronger, and layering and falling are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of road engineering, and in particular to a noise barrier board. Background Art

[0002] There are many types of sound barriers, among which precast concrete sound barriers are widely used in engineering. Compared with traditional metal sound barriers, precast concrete sound barriers have the advantages of reliable structure, good noise reduction performance, durability, and beautiful appearance. However, there are still some shortcomings in concrete sound barriers: traditional concrete sound barriers are made of natural stone materials, which ensures structural strength but is not economical and environmentally friendly.

[0003] Noise barrier panels made of environmentally friendly materials have problems such as complicated processes and delamination, which affects their service life. Summary of the invention

[0004] The present application provides a noise barrier plate to solve the problem of delamination and shedding of the existing noise barrier plates.

[0005] In a first aspect, the present application provides a noise barrier plate, comprising a front panel and a back panel arranged in sequence, wherein:

[0006] The panel contains the material of the back panel.

[0007] The present application combines the panel and the back panel into one by having the back panel material in the panel and forming a contact surface through the penetration of the back panel material and the panel material. The slurry material of the back panel can penetrate into the pores of the panel to make the bonding stronger and reduce delamination and falling off.

[0008] It should be noted that noise usually propagates laterally along the road and has a greater impact on residents. Therefore, the face plate of the noise barrier board of the present application is close to the road side and the back plate is close to the residents side, which can improve the effect of absorbing high-frequency noise.

[0009] In some embodiments, the porosity of the panel is 10% to 40%. Since the panel contains the material of the back panel, in order to provide space for the penetration of the back panel material, a certain amount of pores needs to be retained in the panel material. At the same time, the porosity of the surface layer can also improve the absorption of noise and improve the noise reduction effect. The porosity of the panel within this range is conducive to the penetration of the back panel material and can improve the noise reduction performance of the noise barrier board.

[0010] In some embodiments, the thickness of the panel is 70 to 100 mm. When the thickness of the panel is within this range, the noise absorption effect can be improved, while the strength of the noise barrier plate can be improved, and the service life of the noise barrier plate can be increased; and / or,

[0011] The thickness of the back plate is 50 to 80 mm. When the thickness of the back plate is within this range, the mechanical properties and durability of the back plate can be significantly improved.

[0012] In some embodiments, the panel material includes solid waste recycled aggregate, solid waste cementitious material, cement and water reducing agent. Using solid waste recycled aggregate as the panel material saves natural stone, utilizes waste, is green and low-carbon and environmentally friendly, has better sound absorption effect, and can withstand wind and rain erosion. Traditional sound-absorbing cotton will fall off and age after a long time of use, affecting the sound absorption effect. Compared with sound-absorbing cotton, solid waste recycled aggregate has a longer service life. The panel material is formed by wrapping the aggregate with cement slurry and hydrating the cement, so that it can form suitable pores after solidification for the penetration of the backboard material.

[0013] The material of the backboard includes solid waste recycled aggregate, sand and gravel, solid waste cementitious material, cement, water reducing agent and fiber. The backboard material is adjusted by proportioning to obtain high-strength and high-fluidity fiber concrete, which can make the slurry formed by it more easily penetrate into the panel material. Adding fiber to the backboard concrete can significantly improve the mechanical properties and durability of the backboard concrete. Different fiber types are suitable for different engineering requirements. Selecting the appropriate fiber type can greatly improve the performance of the backboard concrete.

[0014] In some embodiments, the mass ratio of solid waste recycled aggregate, solid waste cementitious material, cement and water reducing agent in the panel material is (70-80): (7-12): (15-20): (1-5). When the mass ratio of solid waste recycled aggregate, solid waste cementitious material, cement and water reducing agent in the panel is within this range, friction energy can be consumed in the holes formed between the aggregates of the panel, which has a better sound absorption effect than the traditional sound absorption screen.

[0015] It should be noted that, in the actual preparation process, water needs to be added to the panel material for slurrying. Usually, the mass fraction of water in the whole slurry is 4% to 5%.

[0016] In some embodiments, the mass ratio of solid waste recycled aggregate, sand and gravel, solid waste cementitious material, cement, water reducing agent and fiber in the backboard material is (35-40): (30-35): (9-12): (11-14): (0.1-0.5): (0.05-0.5). When the mass ratio of solid waste recycled aggregate, sand and gravel, solid waste cementitious material, cement, water reducing agent and fiber in the backboard is within this range, the bending bearing capacity of the board body can be increased, the deadweight of the board body can be reduced, and the manufacturing cost of the sound barrier can be reduced.

[0017] It should be noted that in the actual preparation process, water needs to be added to the backplane material for slurrying. Usually, the mass fraction of water in the entire slurry is 6% to 7%.

[0018] In some embodiments, the particle size of the solid waste recycled aggregate is 2 mm to 10 mm. The particle size of the solid waste recycled aggregate within this range can provide the required pore size for the panel for the backboard material to penetrate, and at the same time can improve the absorption of noise and improve the noise reduction performance.

[0019] It should be noted that the solid waste recycled aggregate is a granular material that plays a role as a skeleton and filler in concrete and mortar. It is usually obtained by crushing, screening and other processes of waste concrete such as construction waste. It is a material of different particle sizes that plays a role as a skeleton and filler for preparing new concrete. The use of solid waste recycled aggregate can make the utilization rate of solid waste aggregate reach a higher level.

[0020] The solid waste gelling material includes at least one of fly ash, mineral powder and silica fume. The use of at least one of the above gelling materials can make the aggregates have better bonding strength; and / or,

[0021] The water reducing agent includes at least one of polyethylene glycol monomethyl ether and acrylic acid. The water reducing agent has the functions of lubrication, wetting, water reduction, plasticization, etc. in concrete coagulation, can reduce water consumption, improve the fluidity of concrete mixture, reduce cement consumption, save cement, and can also improve the strength and durability of concrete, reduce the shrinkage rate of concrete solidification, reduce the generation of cracks in concrete components, and improve antifreeze performance; and / or,

[0022] The fibers include at least one of steel fibers, glass fibers, PP fibers and asbestos fibers. Using at least one of the above fibers can improve the strength of the backboard and increase the bending bearing performance of the noise barrier board. On the basis of achieving the same wind pressure resistance, it can replace the steel frame, reduce the dead weight of the noise barrier board, and reduce the manufacturing cost of the sound barrier.

[0023] In some embodiments, the slurry formed by the material of the backboard has a slump of 180 mm to 220 mm at 25° C.; and / or,

[0024] The expansion of the slurry formed by the material of the backplane at 25° C. is 500 mm to 600 mm.

[0025] The viscosity of the slurry formed by the backboard material affects its fluidity and permeability. The backboard material must ensure a certain fluidity to facilitate penetration into the panel material, and it needs to be quickly cured at room temperature. The slump and expansion of the slurry formed by the backboard material at 25°C are within this range, which can improve the fluidity and permeability of the backboard material slurry and improve its curing efficiency. Slump refers to the degree of deformation of concrete from the mixing state to the pouring state under certain conditions. The fluidity of concrete is evaluated by measuring the slump height of concrete in the cone mold, and the cohesion and water retention are evaluated by intuitive experience. The slump test can be used for measurement. The slump test is determined by measuring the slump height of concrete under the action of its own weight. It is one of the important indicators of concrete workability. Expansion refers to the degree of diffusion of concrete around the bottom of the cone mold in the slump test. It can be measured by the expansion test. The expansion test is to evaluate the working performance of concrete by measuring the diffusion diameter of concrete around the bottom of the cone mold.

[0026] In some embodiments, the density of the backboard is 2500 kg / m 3 ~2550kg / m 3 The density of the backboard affects its strength and sound insulation performance. The density of the backboard within this range can improve the strength and sound absorption performance of the noise barrier board.

[0027] When preparing the noise barrier board, the panel is poured first, and then the backboard slurry is poured directly on the surface of the panel. The panel and the backboard are bonded by the backboard slurry material to form a bond. The backboard fiber concrete and the panel porous concrete are formed in one piece by the reverse beating process. The two phases are firmly attached and the construction efficiency is high. The panel is a porous structure, and the slurry material of the backboard can penetrate into the pores of the panel to make the bonding stronger. No other means are needed. Only the backboard slurry and the penetration of the backboard slurry can make the panel and the backboard firmly bonded. This is simpler and more reliable than the connection form of the conventional sound barrier surface layer and the back layer composite structure. The panel and the backboard are formed in one piece during production. They only need to be poured and vibrated to form, without extrusion, which reduces the manufacturing difficulty and reduces the production cost.

[0028] The backboard fiber concrete is poured after the top porous concrete is poured, which mainly utilizes the principle of synergistic cement hydration of the two concretes. The high-flow backboard fiber concrete poured on the top porous concrete can penetrate into its interior, with a penetration depth of about 10mm to 20mm. At this time, the top porous concrete has not yet completed the initial setting. The cement slurry at the interface of the two phases of concrete will be hydrated synchronously after contact to generate strength, thereby achieving the effect of improving the bonding strength.

[0029] The noise barrier board can be connected by convex and concave joints during assembly. A convex tenon is provided on the top surface and a groove is provided on the bottom surface. The convex tenon and the groove cooperate with each other. The shape of the groove and the convex tenon can be trapezoidal or arc-shaped. The height of the convex tenon is 5 to 10 mm less than the depth of the groove. The convex and concave tenon structure on the top and bottom surfaces can realize the connection between the head and tail of the noise barrier board body and play a fixing role during installation and use. The convex and concave tenon structure of the noise barrier board can also prevent sound leakage and improve the sound insulation effect. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0031] There are many types of sound barriers, among which precast concrete sound barriers are widely used in engineering. Compared with traditional metal sound barriers, precast concrete sound barriers have the advantages of reliable structure, good noise reduction performance, durability, and beautiful appearance. However, there are still some shortcomings in concrete sound barriers: traditional concrete sound barriers are made of natural stone materials, which ensures structural strength but is not economical and environmentally friendly.

[0032] Noise barrier panels made of environmentally friendly materials have the problems of complicated processes and delamination, which affect their service life. For example, a perlite ceramsite composite sound-absorbing board, the sound barrier uses a perlite sound-absorbing material as the panel, ceramsite concrete as the back panel, the sound barrier panel and the back panel are roughened to increase the bonding strength, and the production requires extrusion molding. Although this solution effectively enhances the bonding strength between the panel and the back panel, it requires extrusion molding, which is a complicated process. In addition, the panel material in this solution uses perlite, which invisibly increases the material cost, and the selected materials do not meet the purpose of green and low-carbon. For this reason, it is necessary to develop a composite concrete sound barrier with a simpler production process, a more reliable bonding effect, and a more environmentally friendly material.

[0033] In view of this, the present application provides a noise barrier plate to solve the problem of delamination and detachment of existing noise barrier plates.

[0034] In a first aspect, the present application provides a noise barrier plate, comprising a front panel and a back panel arranged in sequence, wherein:

[0035] The panel contains the material of the back panel.

[0036] In the present application, the side of the panel that contacts the back panel is infiltrated with the material of the back panel, and a contact surface is formed by the infiltration of the back panel material and the panel material to combine the panel and the back panel into one. The slurry material of the back panel can penetrate into the pores of the panel to make the bonding stronger and reduce delamination and falling off.

[0037] It should be noted that noise usually propagates laterally along the road and has a greater impact on residents. Therefore, the face plate of the noise barrier board of the present application is close to the road side and the back plate is close to the residents side, which can improve the effect of absorbing high-frequency noise.

[0038] In combination with the first aspect, in some embodiments provided in the present application, the porosity of the panel is 10% to 40%. Since the material of the backplane is infiltrated on the side of the panel that contacts the backplane, in order to provide space for the penetration of the backplane material, a certain amount of pores needs to be retained in the panel material. At the same time, the porosity of the surface layer can also increase the absorption of noise and improve the noise reduction effect. The porosity of the panel within this range is conducive to the penetration of the backplane material and can improve the noise reduction performance of the noise barrier board.

[0039] In combination with the first aspect, in some embodiments provided in the present application, the thickness of the panel is 70 to 100 mm. The thickness of the panel within this range can improve the noise absorption effect, while improving the strength of the noise barrier board and increasing the service life of the noise barrier board.

[0040] In combination with the first aspect, in some embodiments provided in the present application, the thickness of the backboard is 50 to 80 mm. When the thickness of the backboard is within this range, the mechanical properties and durability of the backboard can be significantly improved.

[0041] In combination with the first aspect, in some embodiments provided in the present application, the panel material includes solid waste recycled aggregate, solid waste cementitious material, cement and water reducing agent. The solid waste recycled aggregate is used as the panel material, which saves natural stone, utilizes waste, is green, low-carbon and environmentally friendly, and has better sound absorption effect and is resistant to wind and rain erosion. Traditional sound-absorbing cotton will fall off and age after a long time of use, affecting the sound absorption effect. Compared with sound-absorbing cotton, solid waste recycled aggregate has a longer service life. The panel material is formed by hydration of cement slurry including aggregate and cement, so that it can form suitable pores after solidification for the penetration of the backboard material.

[0042] The material of the backboard includes solid waste recycled aggregate, sand and gravel, solid waste cementitious material, cement, water reducing agent and fiber. The backboard material is adjusted by proportioning to obtain high-strength and high-fluidity fiber concrete, which can make the slurry formed by it more easily penetrate into the panel material. Adding fiber to the backboard concrete can significantly improve the mechanical properties and durability of the backboard concrete. Different fiber types are suitable for different engineering requirements. Selecting the appropriate fiber type can greatly improve the performance of the backboard concrete.

[0043] In combination with the first aspect, in some embodiments provided in the present application, in the material of the panel, the mass ratio of solid waste recycled aggregate, solid waste cementitious material, cement and water reducing agent is (70-80): (7-12): (15-20): (1-5). When the mass ratio of solid waste recycled aggregate, solid waste cementitious material, cement and water reducing agent in the panel is within this range, friction energy can be consumed in the holes formed between the aggregates of the panel, which has a better sound absorption effect than the traditional sound absorption screen.

[0044] It should be noted that, in the actual preparation process, water needs to be added to the panel material for slurrying. Usually, the mass fraction of water in the whole slurry is 4% to 5%.

[0045] In combination with the first aspect, in some embodiments provided in the present application, in the material of the backboard, the mass ratio of solid waste recycled aggregate, sand and gravel, solid waste cementitious material, cement, water reducing agent and fiber is (35-40):(30-35):(9-12):(11-14):(0.1-0.5):(0.05-0.5). When the mass ratio of solid waste recycled aggregate, sand and gravel, solid waste cementitious material, cement, water reducing agent and fiber in the backboard is within this range, the bending bearing capacity of the board body can be increased, the deadweight of the board body can be reduced, and the manufacturing cost of the sound barrier can be reduced.

[0046] It should be noted that in the actual preparation process, water needs to be added to the backplane material for slurrying. Usually, the mass fraction of water in the entire slurry is 6% to 7%.

[0047] In combination with the first aspect, in some embodiments provided in the present application, the particle size of the solid waste recycled aggregate is 2 mm to 10 mm. The particle size of the solid waste recycled aggregate within this range can provide the required pore size for the panel for the backboard material to penetrate, and at the same time can improve the absorption of noise and improve the noise reduction performance.

[0048] It should be noted that the solid waste recycled aggregate is a granular material that plays a role as a skeleton and filler in concrete and mortar. It is usually obtained by crushing, screening and other processes of waste concrete such as construction waste. It is a material of different particle sizes that plays a role as a skeleton and filler for preparing new concrete. The use of solid waste recycled aggregate can make the utilization rate of solid waste aggregate reach a higher level.

[0049] In combination with the first aspect, in some embodiments provided in the present application, the solid waste gelling material includes at least one of fly ash, mineral powder and silica ash. Using at least one of the above gelling materials can achieve a better bonding effect between aggregates.

[0050] In combination with the first aspect, in some embodiments provided in the present application, the water reducer includes at least one of polyethylene glycol monomethyl ether and acrylic acid. The water reducer has lubricating, wetting, water reducing, plasticizing and other functions in concrete coagulation, which can reduce water consumption, improve the fluidity of concrete mixture, reduce cement consumption, and save cement. The water reducer can also improve the strength and durability of concrete, reduce the shrinkage rate of concrete solidification, reduce the generation of cracks in concrete components, and improve frost resistance.

[0051] In combination with the first aspect, in some embodiments provided in the present application, the fibers include at least one of steel fibers, glass fibers, PP fibers and asbestos fibers. The use of at least one of the above fibers can improve the strength of the backboard and increase the bending bearing capacity of the noise barrier board. On the basis of achieving the same wind pressure resistance, it can replace the steel frame, reduce the dead weight of the noise barrier board, and reduce the manufacturing cost of the sound barrier.

[0052] In combination with the first aspect, in some embodiments provided in the present application, the slump of the slurry formed by the material of the backboard at 25° C. is 180 mm to 220 mm.

[0053] In combination with the first aspect, in some embodiments provided in the present application, the slurry formed by the material of the backplane has an expansion degree of 500 mm to 600 mm.

[0054] The viscosity of the slurry formed by the backboard material affects its fluidity and permeability. The backboard material must ensure a certain fluidity to facilitate penetration into the panel material, and it needs to be quickly cured at room temperature. The slump and expansion of the slurry formed by the backboard material at 25°C are within this range, which can improve the fluidity and permeability of the backboard material slurry and improve its curing efficiency. Slump refers to the degree of deformation of concrete from the mixing state to the pouring state under certain conditions. The fluidity of concrete is evaluated by measuring the slump height of concrete in the cone mold, and the cohesion and water retention are evaluated by intuitive experience. The slump test can be used for measurement. The slump test is determined by measuring the slump height of concrete under the action of its own weight. It is one of the important indicators of concrete workability. Expansion refers to the degree of diffusion of concrete around the bottom of the cone mold in the slump test. It can be measured by the expansion test. The expansion test is to evaluate the working performance of concrete by measuring the diffusion diameter of concrete around the bottom of the cone mold.

[0055] In combination with the first aspect, in some embodiments provided in the present application, the density of the backboard is 2500 kg / m3 ~2550kg / m 3 The density of the backboard affects its strength and sound insulation performance. The density of the backboard within this range can improve the strength and sound absorption performance of the noise barrier board.

[0056] When preparing the noise barrier board, the panel is poured first, and then the backboard slurry is poured directly on the surface of the panel. The panel and the backboard are bonded by the backboard slurry material to form a bond. The backboard fiber concrete and the panel porous concrete are formed in one piece by the reverse beating process. The two phases are firmly attached and the construction efficiency is high. The panel is a porous structure, and the slurry material of the backboard can penetrate into the pores of the panel to make the bonding stronger. No other means are needed. Only the backboard slurry and the penetration of the backboard slurry can make the panel and the backboard firmly bonded. This is simpler and more reliable than the connection form of the conventional sound barrier surface layer and the back layer composite structure. The panel and the backboard are formed in one piece during production. They only need to be poured and vibrated to form, without extrusion, which reduces the manufacturing difficulty and reduces the production cost.

[0057] The backboard fiber concrete is poured after the top porous concrete is poured, which mainly utilizes the principle of synergistic cement hydration of the two concretes. The high-flow backboard fiber concrete poured on the top porous concrete can penetrate into its interior, with a penetration depth of about 10mm to 20mm. At this time, the top porous concrete has not yet completed the initial setting. The cement slurry at the interface of the two phases of concrete will be hydrated synchronously after contact to generate strength, thereby achieving the effect of improving the bonding strength.

[0058] The noise barrier board can be connected by convex and concave joints during assembly. A convex tenon is provided on the top surface and a groove is provided on the bottom surface. The convex tenon and the groove cooperate with each other. The shape of the groove and the convex tenon can be trapezoidal or arc-shaped. The height of the convex tenon is 5 to 10 mm less than the depth of the groove. The convex and concave tenon structure on the top and bottom surfaces can realize the connection between the head and tail of the noise barrier board body and play a fixing role during installation and use. The convex and concave tenon structure of the noise barrier board body can also prevent sound leakage and improve the sound insulation effect.

[0059] The technical solution provided in the present application is described in detail below in conjunction with the embodiments. The solid waste recycled aggregate is the coarse aggregate (particle size 5-10mm) and fine aggregate (particle size 2-5mm) obtained by crushing and screening the construction waste concrete, the solid waste cementitious material is fly ash, the cement is silicate cement, the main components are silicon dioxide, calcium oxide, etc., the water reducer is ethylene glycol monomethyl ether, and the fiber is steel fiber. For example, it is described. In Examples 1 to 4, the panel is cast first, and then the backboard slurry is directly cast on the surface of the panel. The panel and the backboard are bonded to form a bonding force through the backboard slurry material, and the back-beating process is adopted. The panel is a porous structure, and the slurry material of the backboard can penetrate into the pores of the panel.

[0060] Example 1

[0061] Embodiment 1 of the present application provides a noise barrier plate, including a front plate and a back plate, wherein:

[0062] The thickness of the panel is 80 mm, the mass ratio of solid waste recycled aggregate, solid waste cementitious material, cement and water reducing agent in the panel material is 70:7:15:1, the particle size of the solid waste recycled aggregate is 8 mm to 10 mm, and the porosity of the panel is 10%;

[0063] The thickness of the backboard is 70 mm. The mass ratio of solid waste recycled aggregate, sand and gravel, solid waste cementitious material, cement, water reducing agent and fiber in the backboard material is 35:35:9:14:0.5:0.5. The density of the backboard is 2500 kg / m 3 .

[0064] Example 2

[0065] Embodiment 2 of the present application provides a noise barrier plate, comprising a front panel and a back panel, wherein:

[0066] The thickness of the panel is 70 mm, the mass ratio of solid waste recycled aggregate, solid waste cementitious material, cement and water reducing agent in the panel material is 75:8:18:3, the particle size of the solid waste recycled aggregate is 6 mm to 8 mm, and the porosity of the panel is 40%;

[0067] The thickness of the backboard is 80 mm. The mass ratio of solid waste recycled aggregate, sand and gravel, solid waste cementitious material, cement, water reducing agent and fiber in the backboard material is 38:32:11:13:0.3:0.3. The density of the backboard is 2520 kg / m 3 .

[0068] Example 3

[0069] Embodiment 3 of the present application provides a noise barrier plate, comprising a front plate and a back plate, wherein:

[0070] The thickness of the panel is 100 mm, the mass ratio of solid waste recycled aggregate, solid waste cementitious material, cement and water reducing agent in the panel material is 80:12:20:5, the particle size of the solid waste recycled aggregate is 4 mm to 6 mm, and the porosity of the panel is 30%;

[0071] The thickness of the backboard is 50 mm. The mass ratio of solid waste recycled aggregate, sand and gravel, solid waste cementitious material, cement, water reducing agent and fiber in the backboard material is 40:30:12:11:0.1:0.05. The density of the backboard is 2530 kg / m 3 .

[0072] Example 4

[0073] Embodiment 4 of the present application provides a noise barrier plate, including a front panel and a back panel, wherein:

[0074] The thickness of the panel is 90 mm, the mass ratio of solid waste recycled aggregate, solid waste cementitious material, cement and water reducing agent in the panel material is 80:12:15:5, the particle size of the solid waste recycled aggregate is 2 mm to 4 mm, and the porosity of the panel is 20%;

[0075] The thickness of the backboard is 60 mm. The mass ratio of solid waste recycled aggregate, sand and gravel, solid waste cementitious material, cement, water reducing agent and fiber in the backboard material is 40:30:9:14:0.1:0.05. The density of the backboard is 2550 kg / m 3 .

[0076] Comparative Example 1

[0077] Comparative Example 1 of the present application provides a noise barrier board, which is similar to Example 1, except that the front panel and back panel of Comparative Example 1 are bonded with glue, and the material of the back panel does not penetrate into the material of the front panel.

[0078] Performance Testing

[0079] The noise barrier panels of Examples 1 to 4 and Comparative Example 1 were subjected to sound insulation test, sound absorption coefficient test, compression / flexural strength test, tensile strength test and combustion fire resistance test. The specific test methods are as follows:

[0080] Sound insulation test: carried out in accordance with the provisions of GB / T 19889.3.

[0081] Sound absorption coefficient test: carried out in accordance with the provisions of GB / T 20247.

[0082] Compression / flexural strength test: carried out in accordance with the provisions of GB / T 23451.

[0083] Bending and tensile strength test: carried out in accordance with the provisions of GB / T 50081.

[0084] Fire resistance test: carried out in accordance with the provisions of GB / T 8626.

[0085] The specific test results are shown in Table 1.

[0086] Table 1 Performance test results of noise barrier panels of Examples 1 to 4 and Comparative Example 1

[0087] Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Weighted sound insulation 40dB 36dB 33dB 31dB 30dB Sound absorption coefficient 0.7 0.7 0.65 0.6 0.6 Compressive strength 85MPa 85MPa 80MPa 80MPa 40MPa tensile strength 7MPa 7MPa 5MPa 5MPa 4MPa Fire resistance Class A non-flammable Class A non-flammable Class A non-flammable Class A non-flammable Class A non-flammable

[0088] As can be seen from Table 1, in Comparative Example 1, since the front panel and the back panel are bonded with glue, the material of the back panel does not penetrate into the material of the front panel, so the bonding strength, that is, the tensile and compressive strengths, are lower than those of Examples 1 to 4.

[0089] In summary, the panel and the back panel are combined into one by forming a contact surface through the penetration of the back panel material and the panel material. The slurry material of the back panel can penetrate into the pores of the panel to make the bonding stronger and reduce delamination and falling off.

[0090] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments / methods or examples. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0091] It should be noted that, in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the sentence "comprise one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. In the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically stipulated.

[0092] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied for herein.

Claims

1. A noise barrier plate, characterized in that: It includes a front panel and a back panel arranged in sequence, wherein: The panel contains the material of the back panel.

2. The noise barrier plate according to claim 1, characterized in that: The porosity of the panel is 10% to 40%.

3. The noise barrier plate according to claim 1, characterized in that: The thickness of the panel is 70 to 100 mm; and / or, The thickness of the back plate is 50-80 mm.

4. The noise barrier plate according to claim 1, characterized in that: The materials of the panel include solid waste recycled aggregate, solid waste cementitious material, cement and water reducing agent; The materials of the backboard include solid waste recycled aggregate, sand and stone, solid waste cementitious material, cement, water reducing agent and fiber.

5. The noise barrier plate according to claim 4, characterized in that: Among the materials of the panel, the mass ratio of solid waste recycled aggregate, solid waste cementitious material, cement and water reducing agent is (70-80):(7-12):(15-20):(1-5).

6. The noise barrier panel according to claim 4, characterized in that: Among the materials of the backboard, the mass ratios of solid waste recycled aggregate, sand and gravel, solid waste cementitious material, cement, water reducing agent and fiber are (35-40):(30-35):(9-12):(11-14):(0.1-0.5):(0.05-0.5).

7. The noise barrier plate according to claim 4, characterized in that: The particle size of the solid waste recycled aggregate is 2mm to 10mm.

8. The noise barrier plate according to claim 4, characterized in that: The solid waste cementitious material includes at least one of fly ash, mineral powder and silica fume; and / or, The water reducing agent comprises at least one of polyethylene glycol monomethyl ether and acrylic acid; and / or, The fiber includes at least one of steel fiber, glass fiber, PP fiber and asbestos fiber.

9. The noise barrier panel according to claim 4, characterized in that: The slurry formed by the material of the backboard has a slump of 180 mm to 220 mm at 25° C.; and / or, The expansion of the slurry formed by the material of the backplane at 25° C. is 500 m to 600 mm.

10. The noise barrier panel according to claim 1, characterized in that: The density of the backboard is 2500kg / m 3 ~2550kg / m 3 .