Sound insulation aggregate and preparation method thereof, sound insulation concrete and application thereof

Abstract

The present invention provides a sound-insulating aggregate and a preparation method thereof, sound-insulating concrete and its application, and belongs to the field of building material technology. The sound-insulating aggregate provided by the present invention includes a sound-absorbing porous core, an elastic damping layer coated on the surface of the sound-absorbing porous core, and a tough pressure-resistant layer coated on the surface of the elastic damping layer; the raw materials for preparing the sound-absorbing porous core include waste aerated concrete particles; the raw materials for preparing the elastic damping layer include waste elastic plastic powder, waste rubber powder and sawdust; the raw materials for preparing the tough pressure-resistant layer include dehydrated tailings, mineral powder, fly ash and fiber. The sound-insulating aggregate provided by the present invention utilizes a combination of a sound-absorbing porous core, an elastic damping layer and a tough pressure-resistant layer to achieve a step-by-step and continuous consumption of sound wave energy, ultimately achieving the purpose of reducing vibration and noise, and has a good noise reduction effect.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and particularly relates to a sound insulation aggregate and a preparation method thereof, sound insulation concrete and applications thereof. Background Art

[0002] Currently, most traditional building materials are rigid, which has little effect on sound insulation against impact noise. For example, while concrete floors offer good airborne sound insulation, they are not ideal for impact noise. This is because the thickness of the floor slab effectively reflects sound waves transmitted through the air, significantly reducing the energy of the sound waves reaching the lower floors or compartments. Impact sound waves travel faster through rigid structures than through air and over longer distances. Therefore, residents living on lower floors generally cannot hear the voices of those above them. However, the sounds of upper-floor residents mopping tables, children running, and their heels tapping the floor can significantly affect those below. To improve the sound insulation of floor slabs without encroaching on the building's usable height, homeowners typically install a layer of soundproofing material within the floor slab. Two common types of soundproofing materials are soundproofing mortar, which is generally composed of cement, sand, rubber particles (or other vibration-reducing and noise-reducing components), and additives; and flexible carpet. Existing data suggests that laying flexible carpet has the disadvantages of being difficult to clean, prone to mold, and requiring frequent replacement. Ordinary thin-layer sound insulation mortar has very limited sound insulation effect, and also has defects such as poor mechanical properties and easy cracking. Therefore, the mortar paving thickness is generally increased to improve the sound insulation effect. However, this practice significantly increases construction costs and also results in excessively thick floor slabs, which reduces the effective height inside the house and squeezes the usable space inside the house. Summary of the Invention

[0003] The present invention aims to provide a sound-insulating aggregate, a method for preparing the same, and sound-insulating concrete and its application. The sound-insulating aggregate provided by the present invention has excellent sound insulation performance. A sound-insulating concrete layer prepared with the sound-insulating aggregate as the primary component exhibits good sound insulation performance even at a relatively low thickness. Furthermore, the concrete overcomes the technical drawbacks of conventional sound-insulating mortars, such as their tendency to crack and poor mechanical properties.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] The present invention provides a sound insulation aggregate, comprising a sound-absorbing porous core, an elastic damping layer coated on the surface of the sound-absorbing porous core, and a toughness pressure-resistant layer coated on the surface of the elastic damping layer;

[0006] The raw materials for preparing the noise-absorbing porous core include waste aerated concrete particles;

[0007] The raw materials for preparing the elastic damping layer include waste elastic plastic powder, waste rubber powder and sawdust; the mass ratio of the waste elastic plastic powder, waste rubber powder and sawdust is 15-35:45-65:15-35;

[0008] The raw materials for preparing the toughness and compression-resistant layer include dewatered tailings, mineral powder, fly ash and fiber; the mass ratio of the dewatered tailings, mineral powder, fly ash and fiber is 30-50:40-60:10-20:0.1-0.2

[0009] Preferably, the particle size of the sound-absorbing porous core is 5 to 7.5 mm; the thickness of the elastic damping layer is 2 to 3.5 mm; and the thickness of the toughness pressure-resistant layer is 2.5 to 4.5 mm.

[0010] Preferably, the fibers include at least one of polypropylene fibers and glass fibers; and the length of the fibers is 1 to 2 mm.

[0011] Preferably, the particle size of the waste aerated concrete particles is 5 to 7.5 mm; the particle sizes of the waste elastic plastic powder, waste rubber powder and wood chips are independently 0.075 to 0.15 mm; the waste elastic plastic powder includes low-melting-point thermoplastic plastic powder; the low-melting-point thermoplastic plastic powder includes at least one of polyvinyl chloride plastic powder and polypropylene plastic powder; the mass proportion of the low-melting-point thermoplastic plastic powder in the waste elastic plastic powder is 30 to 50%.

[0012] Preferably, the dewatered tailings are obtained by dehydrating one or more of municipal sludge, silt and engineering mud through filter pressing.

[0013] The present invention provides a method for preparing the sound insulation aggregate described in the above technical solution, comprising the following steps:

[0014] The waste aerated concrete particles are mixed with a sodium silicate aqueous solution and subjected to surface hardening treatment in a carbon dioxide-containing atmosphere to obtain a sound-absorbing porous core;

[0015] The sound-absorbing porous core, waste elastic plastic powder, waste rubber powder, sawdust, adhesive and a first coupling agent aqueous solution are mixed, and first granulation and drying are performed in sequence to form an elastic damping layer on the surface of the sound-absorbing porous core to obtain a sound insulation aggregate precursor;

[0016] The sound insulation aggregate precursor, dehydrated tailings, mineral powder, fly ash, fiber, a second coupling agent aqueous solution and an activator are mixed and subjected to a second granulation to form a toughness and compression-resistant layer on the surface of the elastic damping layer to obtain the sound insulation aggregate.

[0017] Preferably, the Baume degree of the sodium silicate aqueous solution is 25-45°Bé; the conditions of the surface hardening treatment include: a volume fraction of carbon dioxide of 11-22%, a relative humidity of 60-75%, and a temperature of 18.5-21.5°C; the drying includes a first drying and a second drying performed sequentially; the temperature of the first drying is 20-25°C, and the holding time is 24 hours; the temperature of the second drying is 120-180°C, and the holding time is 10-30 minutes.

[0018] The present invention provides a sound-insulating concrete comprising the following raw materials, calculated by weight:

[0019] 220-300 parts of cement, 30-70 parts of mineral powder, 500-850 parts of sound insulation aggregate, 1-3 parts of rubber powder, 1-3 parts of magnesium aluminum silicate, 1-3 parts of diatomaceous earth, 2-4.5 parts of emulsion, 180-300 parts of pure concrete recycled fine aggregate, 180-250 parts of recycled micro powder, 200-240 parts of recycled concrete stone powder, 80-130 parts of hollow floating beads, 5-10 parts of spherical polystyrene particles, 6-15 parts of water reducer and 145-195 parts of water;

[0020] The sound insulation aggregate is the sound insulation aggregate described in the above technical solution or the sound insulation aggregate prepared by the preparation method described in the above technical solution.

[0021] The invention provides application of the sound-insulating concrete in sound-insulating building materials.

[0022] Preferably, the application includes: preparing a sound insulation concrete layer on the upper surface of the floor slab; the thickness of the sound insulation concrete layer is 2.5 to 5 cm;

[0023] The sound insulation concrete layer comprises a hollow fiber grid composed of hollow fiber filaments and sound insulation concrete poured in the hollow fiber grid.

[0024] The present invention provides a sound-insulating aggregate. The sound-insulating aggregate provided by the present invention comprises, from top to bottom, a sound-absorbing porous core, an elastic damping layer, and a tough pressure-resistant layer; the sound-absorbing porous core comprises waste aerated concrete particles; the elastic damping layer comprises waste elastic plastic, waste rubber powder, and wood chips; the mass ratio of the elastic plastic, waste rubber, and wood chips is 15-35:45-65:10-15; the tough pressure-resistant layer comprises dehydrated tailings, mineral powder, fly ash, and fiber; the mass ratio of the dehydrated tailings, mineral powder, fly ash, and fiber is 30-50:40-60:10-20:1-2. The sound-insulating aggregate provided by the present invention utilizes a combination of a sound-absorbing porous core, an elastic damping layer, and a tough pressure-resistant layer to achieve a step-by-step and continuous consumption of sound wave energy, ultimately achieving the purpose of reducing vibration and noise, and having a good noise reduction effect. The sound insulation concrete layer prepared with the sound insulation aggregate provided by the present invention as the main component has a good sound insulation effect when the thickness is small, and overcomes the technical defects of traditional sound insulation mortar such as easy cracking and poor mechanical properties, which is conducive to its application in sound insulation building materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A cross-sectional view of the sound insulation aggregate provided by the present invention;

[0027] Figure 2 A physical picture of the raw materials for preparing the sound-absorbing porous core provided by the present invention;

[0028] Figure 3 A front cross-sectional view of the sound insulation concrete layer provided by the present invention;

[0029] Figure 4 A schematic diagram of the wire-bundling steel nails in the sound-insulating concrete layer provided by the present invention;

[0030] Figure 5 A detailed diagram of the bundling of the hollow fiber grid provided by the present invention;

[0031] Figure 6 This is a structural layout diagram of the hollow fiber grid provided by the present invention. DETAILED DESCRIPTION

[0032] The present invention provides a sound insulation aggregate, comprising a sound-absorbing porous core, an elastic damping layer coated on the surface of the sound-absorbing porous core, and a tough pressure-resistant layer coated on the surface of the elastic damping layer; the raw materials for preparing the sound-absorbing porous core include waste aerated concrete particles; the raw materials for preparing the elastic damping layer include waste elastic plastic powder, waste rubber powder and wood chips; the mass ratio of the waste elastic plastic powder, waste rubber powder and wood chips is 15-35:45-65:15-35; the raw materials for preparing the tough pressure-resistant layer include dehydrated tailings, mineral powder, fly ash and fiber; the mass ratio of the dehydrated tailings, mineral powder, fly ash and fiber is 30-50:40-60:10-20:0.1-0.2.

[0033] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known to those skilled in the art.

[0034] like Figure 1 As shown, the sound-insulating aggregate provided by the present invention includes a sound-absorbing porous core, an elastic damping layer coated on the surface of the sound-absorbing porous core, and a tough pressure-resistant layer coated on the surface of the elastic damping layer. In the present invention, the particle size of the sound-absorbing porous core is preferably 5 to 7.5 mm, more preferably 5.5 to 7 mm; the thickness of the elastic damping layer is 2 to 3.5 mm, more preferably 2.5 to 3 mm; the thickness of the tough pressure-resistant layer is 2.5 to 4.5 mm, more preferably 3 to 4 mm. The sound-insulating aggregate of the present invention utilizes a combination of a tough pressure-resistant layer, an elastic damping layer and a sound-absorbing porous core to achieve a step-by-step and continuous consumption of sound wave energy, ultimately achieving the purpose of reducing vibration and noise.

[0035] The raw materials for preparing the sound-absorbing porous core of the present invention include waste aerated concrete particles. Figure 2 As shown by Figure 2 It can be seen that the surface and interior of the raw materials for preparing the sound-absorbing porous core have a porous structure. In the present invention, the particle size of the waste aerated concrete particles is preferably 5 to 7.5 mm, more preferably 5.5 to 7 mm. The present invention preferably crushes and screens large pieces of waste aerated concrete blocks in sequence to obtain waste aerated concrete particles. The present invention does not specifically limit the crushing method, and a crushing method well known to those skilled in the art can be used. The present invention does not specifically limit the screening method, and a screening method well known to those skilled in the art can be used to obtain waste aerated concrete particles of the desired particle size. In the present invention, a large number of closed or semi-closed pores of uniform size are distributed on the surface and inside of the waste aerated concrete particles. Using waste aerated concrete particles as the sound-absorbing porous core of the sound-insulating aggregate can repeatedly refract and offset sound waves in closed or semi-closed holes, and finally consume them in the form of heat, thereby ultimately achieving noise reduction and blocking.

[0036] The raw materials for preparing the elastic damping layer of the present invention include waste elastic plastic powder, waste rubber powder and wood chips. In the present invention, the mass ratio of the waste elastic plastic powder, waste rubber powder and wood chips is 15-35:45-65:15-35, preferably 20-30:50-60:20-30. In the present invention, the particle size of the waste elastic plastic powder, waste rubber powder and wood chips is independently preferably 0.075-0.15 mm, more preferably 0.08-0.1 mm. In the present invention, the waste elastic plastic, waste rubber and wood blocks are preferably crushed and sieved in sequence to obtain waste elastic plastic powder, waste rubber powder and wood chips. The present invention does not specifically limit the crushing method, and a crushing method well known to those skilled in the art can be used. In the present invention, the waste elastic plastic powder preferably includes low-melting-point thermoplastic plastic powder; the low-melting-point thermoplastic plastic powder preferably includes at least one of polyvinyl chloride plastic powder and polypropylene plastic powder; the mass proportion of the low-melting-point thermoplastic plastic powder in the waste elastic plastic powder is preferably 30-50%, more preferably 35-45%. In an embodiment of the present invention, the waste elastic plastic powder, waste rubber powder and sawdust are obtained by low-temperature freezing and crushing. The present invention does not specifically limit the screening method, and the screening method well known to those skilled in the art can be used to obtain waste elastic plastic powder, waste rubber powder and sawdust of the desired particle size. In the present invention, the elastic damping layer has both the elastic damping properties of waste elastic plastic powder and waste rubber powder and the porous sound absorption properties of sawdust, which can weaken low-frequency noise vibrations, absorb part of high-frequency noise, and block most of the sound wave energy.

[0037] The raw materials used to prepare the tough, compressive-resistant layer described in the present invention include dewatered tailings, mineral powder, fly ash, and fiber; the mass ratio of dewatered tailings, mineral powder, fly ash, and fiber is 30-50:40-60:10-20:0.1-0.2, preferably 35-45:42-54:13-17:0.1-0.15. In the present invention, the dewatered tailings are preferably obtained by filter pressing and dewatering one or more of municipal sludge, silt, and engineering mud. The moisture content of the municipal sludge, silt, and engineering mud is preferably 30-40%, more preferably 35%. The filter pressing dewatering method is not particularly limited in the present invention; methods well known to those skilled in the art can be used. The moisture content of the dewatered tailings is preferably less than 5%. The fly ash described in the present invention is preferably secondary fly ash. The fibers described in the present invention include at least one of polypropylene fiber and glass fiber; the fiber length is preferably 1-2 mm, more preferably 1.5-1.8 mm.

[0038] The present invention also provides a method for preparing the sound-insulating aggregate described in the above technical solution, comprising the following steps: mixing waste aerated concrete particles and a sodium silicate aqueous solution, performing a surface hardening treatment in a carbon dioxide-containing atmosphere to obtain a sound-absorbing porous core; mixing the sound-absorbing porous core, waste elastic plastic powder, waste rubber powder, wood chips, an adhesive and a first coupling agent aqueous solution, and sequentially performing a first granulation and drying to form an elastic damping layer on the surface of the sound-absorbing porous core to obtain a sound-absorbing aggregate precursor; mixing the sound-absorbing aggregate precursor, dehydrated tailings, mineral powder, fly ash, fiber, a second coupling agent aqueous solution and an activator, and performing a second granulation to form a toughness and pressure-resistant layer on the surface of the elastic damping layer to obtain the sound-absorbing aggregate.

[0039] The present invention mixes waste aerated concrete particles with a sodium silicate aqueous solution and performs a surface hardening treatment in a carbon dioxide-containing atmosphere to obtain a sound-absorbing porous core. In the present invention, the sodium silicate aqueous solution preferably has a Baume degree of 25 to 45°Bé, more preferably 30 to 40°Bé; the modulus of the sodium silicate aqueous solution is preferably 1.0 to 3.2, more preferably 1.5 to 3; and the surface hardening treatment conditions include: a carbon dioxide volume fraction of preferably 11 to 22%, more preferably 16 to 20%; a relative humidity of preferably 60 to 75%, more preferably 65 to 72%; a temperature of preferably 18.5 to 21.5°C, more preferably 19 to 21°C; and a uniformity of preferably -1 to 1°C, more preferably 1°C. In the present invention, the waste aerated concrete particles have a cavity skeleton structure, and the surface of the waste aerated concrete particles is moistened by an aqueous sodium silicate solution, that is, the surface hardening of the waste aerated concrete particles is completed without involving the filling of the internal cavity structure, so that the sound-absorbing porous core maintains good anti-destruction ability during the preparation process, that is, maintains the integrity of a large number of internal cavity structures, thereby improving the efficiency of each cavity structure in dividing, reflecting, and consuming noise, and ultimately achieving the weakening and blocking of noise.

[0040] After obtaining the sound-absorbing porous core, the present invention combines the sound-absorbing porous core with waste elastic plastic powder, waste rubber powder, sawdust, a binder, and a first coupling agent aqueous solution, and sequentially performs a first granulation and drying process to form an elastic damping layer on the surface of the sound-absorbing porous core, thereby obtaining a sound-absorbing aggregate precursor. In the present invention, the binder preferably comprises EVA emulsion and water, with the mass ratio of EVA emulsion to water in the binder preferably being 1:3-5, more preferably 1:3-4. The coupling agent in the first coupling agent aqueous solution of the present invention is preferably a silane coupling agent, with the mass fraction of the silane coupling agent in the first coupling agent aqueous solution preferably being 1-3%, specifically 1%, 2%, or 3%. The present invention does not specifically limit the type of silane coupling agent; conventional silane coupling agents can be used. In the embodiments of the present invention, KH550 silane coupling agent is specifically used. The present invention does not specifically limit the method and conditions for the first granulation process; granulation methods familiar to those skilled in the art can be used. In an embodiment of the present invention, the first granulation is performed in a rotary granulator, and the rotation speed of the rotary granulator is preferably 30-40 rpm, more preferably 35 rpm. The drying process of the present invention preferably includes a first drying process and a second drying process, performed sequentially. The temperature of the first drying process is preferably 20-25°C, and the holding time is preferably 24 hours. The temperature of the second drying process is preferably 120-180°C, and the rate of increase to the second drying temperature is preferably 10°C / min, and the holding time is preferably 10-30 minutes. In the present invention, the drying process preferably includes cooling. The method and conditions of cooling are not particularly limited in the present invention; any cooling method familiar to those skilled in the art can be used. In the present invention, the binder facilitates the formation of the sound-insulating aggregate precursor. The first drying process removes excess moisture from the elastic damping layer while providing the binder with sufficient drying and hardening time to form a bond, thereby maintaining the integrity of the elastic damping layer and creating conditions for the second drying process. The second drying process partially melts the raw materials for the elastic damping layer, thereby bonding the raw materials together, forming an elastic damping layer on the surface of the sound-absorbing porous core, and producing the sound-insulating aggregate precursor.

[0041] After obtaining the sound insulation aggregate precursor, the present invention mixes the sound insulation aggregate precursor, dewatered tailings, mineral powder, fly ash, fiber, a second coupling agent aqueous solution, and an activator, and performs a second granulation process to form a tough, compressive-resistant layer on the surface of the elastic damping layer, thereby obtaining the sound insulation aggregate. The coupling agent in the second coupling agent aqueous solution of the present invention is preferably a silane coupling agent, and the mass fraction of the silane coupling agent in the second coupling agent aqueous solution is preferably 1-3%, specifically 1%, 2%, or 3%. The present invention does not specifically limit the type of silane coupling agent; conventional silane coupling agents can be used. In an embodiment of the present invention, KH550 silane coupling agent is specifically used. The activator of the present invention preferably comprises a sodium silicate aqueous solution, sodium hydroxide, and water; the mass ratio of the sodium silicate aqueous solution, sodium hydroxide, and water is preferably 25-50:20-30:60-100, and more preferably 35-47:23-27:70-90. The modulus of the sodium silicate aqueous solution of the present invention is preferably 1.0 to 3.2, more preferably 1.5 to 3. The present invention does not specifically limit the method and conditions for the second granulation, and any granulation method familiar to those skilled in the art may be used. In an embodiment of the present invention, the second granulation is performed on a rotary granulator having a rotational speed of 30 to 40 r / min, more preferably 35 r / min. The particle size of the sound insulation aggregate of the present invention is preferably 15 to 20 mm.

[0042] The present invention also provides a sound-insulating concrete, which includes the following raw materials, measured by mass: 220-300 parts of cement, 30-70 parts of mineral powder, 500-850 parts of sound-insulating aggregate, 1-3 parts of glue powder, 1-3 parts of magnesium aluminum silicate, 1-3 parts of diatomaceous earth, 2-4.5 parts of emulsion, 180-300 parts of pure concrete recycled fine aggregate, 180-250 parts of recycled micropowder, 200-240 parts of recycled concrete stone powder, 80-130 parts of hollow floating beads, 5-10 parts of spherical polystyrene particles, 6-15 parts of water reducer and 145-195 parts of water; the sound-insulating aggregate is the sound-insulating aggregate described in the above technical scheme or the sound-insulating aggregate prepared by the preparation method described in the above technical scheme.

[0043] The raw materials for preparing the sound-insulating concrete of the present invention include 220 to 300 parts by mass, preferably 230 to 270 parts by mass of cement. In the present invention, the cement is preferably Portland cement; the strength grade of the Portland cement is preferably 32.5 and / or 42.5.

[0044] The raw materials for preparing the sound-insulating concrete of the present invention include 30 to 70 parts by mass of the cement, preferably 45 to 60 parts by mass of the mineral powder. In the present invention, the mineral powder is preferably S95 grade blast furnace slag powder; the activity index of the S95 grade blast furnace slag powder is preferably ≥95%.

[0045] Based on the mass fraction of the cement, the raw materials for preparing the sound-insulating concrete of the present invention include 500-850 parts of sound-insulating aggregate, preferably 550-750 parts. In the present invention, the sound-insulating aggregate is the sound-insulating aggregate described in the above technical solution or the sound-insulating aggregate prepared by the preparation method described in the above technical solution.

[0046] The raw materials for preparing the sound-insulating concrete of the present invention include 1 to 3 parts, preferably 1 to 2 parts, of rubber powder, based on the mass fraction of the cement. In the present invention, the rubber powder is preferably a water-soluble redispersible latex powder; the particle size of the water-soluble redispersible latex powder is preferably ≥300 mesh, more preferably 300 to 800 mesh.

[0047] Based on the mass fraction of the cement, the raw materials for preparing the sound insulation concrete of the present invention include 1 to 3 parts of magnesium aluminum silicate, preferably 1 to 2 parts. In the present invention, the particle size of the magnesium aluminum silicate is preferably ≥300 mesh, more preferably 300 to 800 mesh.

[0048] The raw materials for preparing the sound-insulating concrete of the present invention include 1 to 3 parts, preferably 1 to 2 parts, of diatomaceous earth, based on the mass fraction of the cement. In the present invention, the mass fraction of silicon dioxide in the diatomaceous earth is preferably 70% to 80%, more preferably 75%; the particle size of the diatomaceous earth is preferably ≥300 mesh, more preferably 300 to 800 mesh.

[0049] Based on the mass fraction of the cement, the raw materials for preparing the sound-insulating concrete of the present invention include 2 to 4.5 parts of emulsion, preferably 3 to 4 parts. In the present invention, the emulsion preferably includes EVA emulsion and chloroprene emulsion, and the volume ratio of EVA emulsion to chloroprene emulsion in the emulsion is preferably 3:1.

[0050] The raw materials for preparing the sound-insulating concrete of the present invention include 180 to 300 parts, preferably 180 to 280 parts, of pure coagulated recycled fine aggregate, based on the mass fraction of the cement. In the present invention, the pure coagulated recycled fine aggregate is preferably obtained by sequentially crushing and screening pure concrete blocks; the particle size of the pure coagulated recycled fine aggregate is preferably 0.315 to 0.63 mm.

[0051] The raw materials for preparing the sound-insulating concrete of the present invention include 180-250 parts by mass of the cement, preferably 200-230 parts by mass. In the present invention, the recycled fine powder is preferably obtained by crushing and screening discarded aerated concrete blocks; the particle size of the recycled fine powder is preferably ≤0.045 mm, more preferably 0.001-0.045 mm.

[0052] The raw materials for preparing the sound-insulating concrete of the present invention include 200-240 parts by mass of the cement, preferably 210-230 parts by mass of recycled concrete stone powder. In the present invention, the recycled concrete stone powder is preferably obtained by sequentially crushing and screening waste concrete blocks; the particle size of the recycled concrete stone is preferably ≤0.045 mm, more preferably 0.001-0.045 mm.

[0053] The raw materials for preparing the sound-insulating concrete of the present invention include 80-130 parts, preferably 100-120 parts, of hollow floating beads, based on the mass fraction of the cement. In the present invention, the hollow floating beads are preferably hollow fly ash spheres; the particle size of the hollow fly ash spheres is preferably ≥100 mesh, more preferably 100-150 mesh.

[0054] Based on the mass fraction of the cement, the raw materials for preparing the sound-insulating concrete of the present invention include 5 to 10 parts of spherical polystyrene particles, preferably 5 to 8 parts. In the present invention, the particle size of the spherical polystyrene particles is preferably 2.5 to 5 mm.

[0055] The raw materials for preparing the sound-insulating concrete of the present invention include 6 to 15 parts, preferably 7 to 10 parts, of a water reducer, based on the mass fraction of the cement. In the present invention, the water reducer is preferably a polycarboxylic acid water reducer; the water reduction rate of the carboxylic acid water reducer is preferably ≥ 25%, more preferably 30 to 40%.

[0056] Based on the mass fraction of the cement, the raw materials for preparing the sound insulation concrete of the present invention further include 145 to 195 parts of water, preferably 160 parts.

[0057] The present invention preferably mixes the raw materials for preparing the sound insulation concrete to obtain the sound insulation concrete. The present invention has no particular limitation on the mixing method of the raw materials for preparing the sound insulation concrete, and any mixing method well known to those skilled in the art can be used.

[0058] In the present invention, since the sound-insulating porous core and the elastic damping layer with sound insulation ability are wrapped by the tough compressive layer, direct contact between the sound insulation components in the sound insulation aggregate and other components of the concrete is avoided, the technical defects of poor mechanical properties and easy cracking caused by the adhesion between the sound insulation components in the sound insulation aggregate and other components of the sound insulation concrete are eliminated, and the compressive strength of the sound insulation concrete is improved.

[0059] The invention also provides application of the sound-insulating concrete in sound-insulating building materials.

[0060] In the present invention, the application preferably includes: preparing a sound insulation concrete layer on the upper surface of the floor slab; the sound insulation concrete layer preferably comprises a hollow fiber grid composed of hollow fiber filaments and sound insulation concrete poured in the hollow fiber grid. In the present invention, the thickness of the sound insulation concrete layer is preferably 2.5 to 5 cm, more preferably 3.5 cm. The hollow fiber filaments described in the present invention are preferably natural hollow fiber filaments and / or artificially synthesized hollow fiber filaments. In the present invention, the application method more preferably includes: preparing a sound insulation concrete layer on the upper surface of the floor slab, preparing a mortar leveling layer on the upper surface of the sound insulation concrete layer, and preparing a surface decoration layer on the upper surface of the mortar leveling layer. The present invention does not specifically limit the preparation method of the floor slab, the mortar leveling layer and the surface decoration layer, and the conventional preparation method in the field can be used. The front cross-sectional view of the sound insulation concrete layer provided by the present invention is shown in FIG. Figure 3 As shown. The angle between the sound-insulating concrete layer and the wall of the present invention is preferably 90°. In the present invention, the preparation method of the sound-insulating concrete layer preferably includes the following steps: drilling holes on the surface of the floor slab, and laying wire-bundling steel nails with at least two grooves at the holes; winding hollow fiber filaments on the grooves of the wire-bundling steel nails to form at least two layers of hollow fiber grids on the surface of the floor slab and the wall; pouring sound-insulating concrete into the hollow fiber grid to form a sound-insulating concrete layer. In the present invention, the spacing between adjacent wire-bundling steel nails is preferably 5 to 15 cm; the spacing between adjacent grooves on the wire-bundling steel nails is preferably 1.5 to 2 cm, the depth of the hole is preferably 2 to 3 cm; and the diameter of the hole is preferably 2.5 mm. The schematic diagram of the wire-bundling steel nails in the sound-insulating concrete layer provided by the present invention is shown as follows. Figure 4 As shown; the bundle details of the hollow fiber grid are shown in Figure 5 As shown; the structural layout of the hollow fiber grid is shown in Figure 6 After the sound insulation concrete is poured into the hollow fiber grid, the sound insulation concrete is preferably subjected to a curing treatment; the curing temperature is preferably room temperature; and the curing time is preferably 3 to 7 days, more preferably 4 to 5 days.

[0061] The sound-insulating concrete layer provided by the present invention is inlaid with a double-layer hollow fiber grid, and a large amount of sound-insulating concrete containing sound-insulating aggregate is added in the gaps between the hollow fiber grids. When high-frequency sound waves are transmitted into the sound-insulating concrete layer, the hollow structure of the hollow fiber grid, the porous core structure in the sound-insulating aggregate, and the hollow floating beads embedded in the mortar can effectively absorb the energy of medium and high-frequency sound waves. That is, these structures provide a large number of air barriers to repeatedly reflect and consume the medium and high-frequency sound waves entering the sound-insulating concrete layer, causing the medium and high-frequency sound waves to weaken rapidly until they are completely consumed. At the same time, the sound insulation concrete layer provided by the present invention is provided with three damping structures, namely, the flexible fibers of the double-layer hollow fiber grid, the composite elastic damping layer in the sound insulation aggregate, and the elastic polystyrene particles embedded in the sound insulation concrete layer. Among them, the double-layer hollow fiber grid is arranged in two layers in the form of a fixed spacing and is fastened with special steel nails. On the one hand, it avoids the phenomenon of cracking of the sound insulation concrete due to uneven force caused by the random distribution of the hollow fiber yarns. On the other hand, the uniform distribution of the flexible hollow fiber yarns greatly reduces the overall stiffness of the sound insulation concrete layer, that is, it gives the sound insulation concrete layer a certain toughness. When low-frequency sound waves (impact) are generated, the vibration energy is first received by the surface of the sound-insulating concrete layer. Since the mortar layer is equipped with a hollow fiber grid, the elastic properties imparted by it weaken the vibration energy in the first wave. The remaining vibration energy is weakened for a second time in the composite elastic damping layer of a large amount of sound-insulating aggregate. The escaped vibration energy continues to enter the elastic polystyrene particles embedded in the mortar for a third weakening. Finally, the vibration generated by the impact is greatly buffered and consumed. The remaining low-frequency sound waves are repeatedly reflected and consumed in the holes of the hollow fiber grid, the closed pores in the sound-absorbing porous core of the sound-insulating aggregate, and the air barrier in the hollow floating beads in the sound-insulating concrete. Finally, the low-frequency noise is isolated or greatly weakened.

[0062] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0063] In the embodiments of the present invention, the specifications of the specific reagents are as follows:

[0064] Waste aerated concrete particles (particle size 5-7.5 mm, source: obtained by crushing and screening large pieces of waste aerated concrete blocks in construction waste);

[0065] Waste elastic plastic powder (particle size 0.075-0.15 mm, source: waste elastic plastic in renovation waste, obtained by low-temperature freezing, crushing and screening; polypropylene plastic powder accounts for 40% of the waste elastic plastic powder);

[0066] Waste rubber powder (particle size 0.075-0.15 mm, source: waste rubber from renovation waste obtained by low-temperature freezing, crushing and screening);

[0067] Sawdust (particle size 0.075-0.15 mm, source: wood blocks from renovation waste, cryogenically frozen, crushed, and sieved);

[0068] Dewatered tailings (source: municipal sludge dewatered by filter pressing);

[0069] Fiber (polypropylene fiber, purchased from Shandong Jinhongyao Materials Co., Ltd., national standard 3mm, cut into 1-2mm);

[0070] Fly ash (secondary fly ash, purchased from Shenzhen Luqun Trading Co., Ltd., second level F);

[0071] Cement (Portland cement, strength grade 42.5, purchased from Foshan Conch Cement Co., Ltd.);

[0072] Mineral powder (S95 grade blast furnace slag powder, activity index ≥95%, purchased from Henan Hengyuan New Materials Co., Ltd.);

[0073] Rubber powder (water-soluble redispersible latex powder, particle size ≥ 300 mesh, purchased from Shanxi Sanwei Group Co., Ltd., model SWF-05);

[0074] Magnesium aluminum silicate (particle size 300 mesh, purchased from Guangzhou Shengxin Chemical Technology Co., Ltd.);

[0075] Diatomaceous earth (SiO2 mass fraction of 70%, particle size of 300 mesh, purchased from Henan Boxu Environmental Protection Technology Co., Ltd.);

[0076] Emulsion (a mixture of EVA emulsion and chloroprene emulsion, the volume ratio of EVA emulsion to chloroprene emulsion is 3:1; EVA emulsion was purchased from Dalian Chemical, Taiwan, China, model 102, solid content ≥54.5%; chloroprene emulsion was purchased from Shandong Jingtian New Building Materials Co., Ltd., product number JT-019);

[0077] Pure concrete recycled fine aggregate (particle size of 0.315-0.63 mm, sourced from pure concrete blocks in construction waste);

[0078] Recycled micro powder (particle size 0.001-0.045 mm, sourced from discarded aerated concrete blocks in construction waste);

[0079] Recycled concrete stone powder (particle size 0.001-0.045mm, sourced from discarded concrete blocks in construction waste);

[0080] Polystyrene particles (polystyrene spherical particles, particle size 2.5-5 mm, purchased from Shengfeng Foam Factory, Hengli, Dongguan City);

[0081] Hollow floating beads (hollow fly ash balls, particle size 100 mesh, purchased from Lingshou County Tusheng Mineral Products Co., Ltd.);

[0082] Water reducer (polycarboxylate water reducer, water reduction rate 30%, purchased from Shandong Ruihongde Chemical Technology Co., Ltd.);

[0083] Other reagents used in the examples are commercially available.

[0084] Example 1

[0085] 30 kg of waste aerated concrete particles were mixed with a sodium silicate aqueous solution (30° Baume, modulus 1.5), and surface hardened in a carbon dioxide atmosphere (hardening conditions: carbon dioxide volume fraction 18%, relative humidity 70%, temperature 20°C, temperature uniformity 1°C) to obtain a sound-absorbing porous core;

[0086] The sound-absorbing porous core obtained by the above treatment is poured into a rotary granulator, and the first coupling agent aqueous solution (1% by mass of KH550 silane coupling agent) is sprayed to wet the surface of the sound-absorbing porous core. Then, 20 kg of waste elastic plastic powder, 65 kg of waste rubber powder, 15 kg of sawdust and an adhesive (EVA emulsion and water are mixed in a mass ratio of 1:3) are poured into the rotary granulator, and granulation is performed on the rotary granulator at a speed of 35 r / min. After granulation, it is first dried at 22 ° C for 24 hours and then dried at 165 ° C for 25 minutes. After cooling, an elastic damping layer is formed on the surface of the sound-absorbing porous core to obtain a sound insulation aggregate precursor;

[0087] The sound insulation aggregate precursor obtained by the above treatment is poured into a rotary granulator, and the second coupling agent aqueous solution (KH550 silane coupling agent with a mass fraction of 1%) is sprayed to wet the surface of the sound-absorbing porous core. Then, 50 kg of dehydrated tailings, 40 kg of mineral powder, 10 kg of fly ash, 0.1 kg of fiber and an activator (sodium silicate aqueous solution, sodium hydroxide and water are mixed in a mass ratio of 40:25:80, and the modulus of the sodium silicate aqueous solution is 1.5) are poured into the rotary granulator, and granulation is carried out on the rotary granulator at a speed of 35 r / min to form a tough compressive layer on the surface of the elastic damping layer to obtain the sound insulation aggregate.

[0088] Example 2

[0089] The modulus of the sodium silicate aqueous solution in the raw material for preparing the sound-absorbing porous core was adjusted to 2, and other conditions were the same as in Example 1 to prepare the sound-insulating aggregate.

[0090] Example 3

[0091] The modulus of the sodium silicate aqueous solution in the raw material for preparing the sound-absorbing porous core was adjusted to 3, and other conditions were the same as in Example 1 to prepare the sound-insulating aggregate.

[0092] Example 4

[0093] The mass of the waste elastic plastic powder was adjusted to 30 kg, the mass of the waste rubber powder was adjusted to 50 kg, and the mass of the wood chips was adjusted to 25 kg. Other conditions were the same as those in Example 1 to prepare sound insulation aggregate.

[0094] Example 5

[0095] The modulus of the sodium silicate aqueous solution in the raw material for preparing the sound-absorbing porous core was adjusted to 2, the mass of the waste elastic plastic powder was adjusted to 30 kg, the mass of the waste rubber powder was adjusted to 50 kg, and the mass of the sawdust was adjusted to 25 kg. Other conditions were the same as in Example 1 to prepare a sound insulation aggregate.

[0096] Example 6

[0097] The modulus of the sodium silicate aqueous solution in the raw material for preparing the sound-absorbing porous core was adjusted to 3, the mass of the waste elastic plastic powder was adjusted to 30 kg, the mass of the waste rubber powder was adjusted to 50 kg, and the mass of the sawdust was adjusted to 25 kg. Other conditions were the same as in Example 1 to prepare a sound insulation aggregate.

[0098] Example 7

[0099] The mass of the waste elastic plastic powder was adjusted to 25 kg, the mass of the waste rubber powder was adjusted to 45 kg, and the mass of the wood chips was adjusted to 30 kg. Other conditions were the same as those in Example 1 to prepare sound insulation aggregate.

[0100] Example 8

[0101] The modulus of the sodium silicate aqueous solution in the raw material for preparing the sound-absorbing porous core was adjusted to 2, the mass of the waste elastic plastic powder was adjusted to 25 kg, the mass of the waste rubber powder was adjusted to 45 kg, and the mass of the sawdust was adjusted to 30 kg. Other conditions were the same as in Example 1 to prepare a sound insulation aggregate.

[0102] Example 9

[0103] The modulus of the sodium silicate aqueous solution in the raw material for preparing the sound-absorbing porous core was adjusted to 3, the mass of the waste elastic plastic powder was adjusted to 25 kg, the mass of the waste rubber powder was adjusted to 45 kg, and the mass of the sawdust was adjusted to 30 kg. Other conditions were the same as in Example 1 to prepare a sound insulation aggregate.

[0104] The sound insulation aggregates obtained in Examples 1 to 9 were subjected to cylinder compression strength tests in accordance with BG / T 1743.1-2010 Lightweight Aggregates and Their Test Methods, Part 2, "Test Methods for Lightweight Aggregates." The compositions, preparation conditions, and cylinder compression strength test results of the sound insulation aggregates obtained in Examples 1 to 9 are shown in Table 1.

[0105] Table 1 Composition / preparation conditions and cylinder pressure strength test results of the sound insulation aggregates obtained in Examples 1 to 9

[0106]

[0107]

[0108] The data in Table 1 shows that the increased modulus and carbonization of the sodium silicate aqueous solution also improve the cylindrical compressive strength of the sound insulation aggregate to a certain extent, but the magnitude is small. This means that the sound-absorbing porous core has a small impact on the cylindrical compressive strength of the sound insulation aggregate; while the compressive damping layer makes almost no contribution to the cylindrical compressive strength of the sound insulation aggregate. Clearly, the cylindrical compressive strength of the sound insulation aggregate depends primarily on the strength of the tough compressive layer. Because the tough compressive layer of the sound insulation aggregate is essentially a hard shell, when the sound insulation aggregate is damaged by external forces, the tough compressive layer can maintain the integrity of the internal sound insulation components (i.e., the sound-absorbing porous core and the elastic damping layer) to a certain extent, ensuring that the sound insulation aggregate still has good sound insulation and vibration reduction performance.

[0109] Example 10

[0110] 30 kg of waste aerated concrete particles were mixed with a sodium silicate aqueous solution (30 degrees Baume, modulus 2), and surface hardened in a carbon dioxide atmosphere (hardening conditions: carbon dioxide volume fraction 18%, relative humidity 70%, temperature 20°C, temperature uniformity 1°C) to obtain a sound-absorbing porous core;

[0111] The sound-absorbing porous core obtained by the above treatment is poured into a rotary granulator, and the first coupling agent aqueous solution (1% by mass of KH550 silane coupling agent) is sprayed to moisten the surface of the sound-absorbing porous core. Then, 30 kg of waste elastic plastic powder, 50 kg of waste rubber powder, 25 kg of sawdust and an adhesive (EVA emulsion and water are mixed in a mass ratio of 1:3) are poured into the rotary granulator, and granulation is performed on the rotary granulator at a speed of 35 r / min. After granulation, it is first dried at 22 ° C for 24 hours and then dried at 165 ° C for 25 minutes. After cooling, an elastic damping layer is formed on the surface of the sound-absorbing porous core to obtain a sound insulation aggregate precursor;

[0112] The sound insulation aggregate precursor obtained by the above treatment is poured into a rotary granulator, and the second coupling agent aqueous solution (KH550 silane coupling agent with a mass fraction of 1%) is sprayed to wet the surface of the sound-absorbing porous core. Then, 50 kg of dehydrated tailings, 40 kg of mineral powder, 10 kg of fly ash, 0.1 kg of fiber and an activator (sodium silicate aqueous solution, sodium hydroxide and water are mixed in a mass ratio of 40:25:80, and the modulus of the sodium silicate aqueous solution is 1.5) are poured into the rotary granulator, and granulation is carried out on the rotary granulator at a speed of 35 r / min to form a tough compressive layer on the surface of the elastic damping layer to obtain the sound insulation aggregate.

[0113] 550 kg of the sound insulation aggregate is mixed with 230 kg of cement, 50 kg of mineral powder, 1 kg of glue powder, 1 kg of magnesium aluminum silicate, 1 kg of diatomaceous earth, 3 kg of emulsion, 280 kg of pure concrete recycled fine aggregate, 210 kg of recycled micropowder, 220 kg of recycled concrete stone powder, 100 kg of hollow floating beads, 5 kg of spherical polystyrene particles, 8 kg of water reducer and 160 kg of water to obtain sound insulation concrete.

[0114] Example 11

[0115] Sound insulation aggregate was prepared according to the method and conditions of Example 10.

[0116] The mass of the sound insulation aggregate was adjusted to 650 kg, and other conditions were the same as in Example 10 to prepare sound insulation concrete.

[0117] Example 12

[0118] Sound insulation aggregate was prepared according to the method and conditions of Example 10.

[0119] The mass of the sound insulation aggregate was adjusted to 750 kg, and other conditions were the same as in Example 10 to prepare sound insulation concrete.

[0120] Example 13

[0121] The mass of the dehydrated tailings was adjusted to 40 kg, the mass of the mineral powder was adjusted to 50 kg, and other conditions were the same as in Example 10 to prepare sound insulation aggregate.

[0122] The mass of the pure concrete recycled fine aggregate was adjusted to 230 kg, and other conditions were the same as in Example 10 to prepare sound insulation concrete.

[0123] Example 14

[0124] The mass of the dehydrated tailings was adjusted to 40 kg, the mass of the mineral powder was adjusted to 50 kg, and other conditions were the same as in Example 10 to prepare sound insulation aggregate.

[0125] The mass of the sound insulation aggregate was adjusted to 650 kg, the mass of the pure concrete recycled fine aggregate was adjusted to 230 kg, and other conditions were the same as in Example 10 to prepare sound insulation concrete.

[0126] Example 15

[0127] The mass of the dehydrated tailings was adjusted to 40 kg, the mass of the mineral powder was adjusted to 50 kg, and other conditions were the same as in Example 10 to prepare sound insulation aggregate.

[0128] The mass of the sound insulation aggregate was adjusted to 750 kg, the mass of the pure concrete recycled fine aggregate was adjusted to 230 kg, and other conditions were the same as in Example 10 to prepare sound insulation concrete.

[0129] Example 16

[0130] The mass of the dehydrated tailings was adjusted to 30 kg, the mass of the mineral powder was adjusted to 60 kg, and other conditions were the same as in Example 10 to prepare sound insulation aggregate.

[0131] The mass of the pure concrete recycled fine aggregate was adjusted to 180 kg, and other conditions were the same as in Example 10 to prepare sound insulation concrete.

[0132] Example 17

[0133] The mass of the dehydrated tailings was adjusted to 30 kg, the mass of the mineral powder was adjusted to 60 kg, and other conditions were the same as in Example 10 to prepare sound insulation aggregate.

[0134] The mass of the sound insulation aggregate was adjusted to 650 kg, the mass of the pure concrete recycled fine aggregate was adjusted to 180 kg, and other conditions were the same as in Example 10 to prepare sound insulation concrete.

[0135] Example 18

[0136] The mass of the dehydrated tailings was adjusted to 30 kg, the mass of the mineral powder was adjusted to 60 kg, and other conditions were the same as in Example 10 to prepare sound insulation aggregate.

[0137] The mass of the sound insulation aggregate was adjusted to 750 kg, the mass of the pure concrete recycled fine aggregate was adjusted to 180 kg, and other conditions were the same as in Example 10 to prepare sound insulation concrete.

[0138] The compressive strength of the soundproof concrete obtained in Examples 10 to 18 was tested in accordance with GB / T50081-2019, "Test Methods for Physical and Mechanical Properties of Concrete." The slump flow rate of the soundproof concrete obtained in Examples 10 to 18 was tested in accordance with BG / T50050-2016, "Test Methods for Properties of Ordinary Concrete Mixtures." The composition / preparation conditions, compressive strength, and slump flow rate test results of the soundproof concrete obtained in Examples 10 to 18 are shown in Table 2.

[0139] Table 2 Composition / preparation conditions and compressive strength and slump expansion test results of the sound insulation concrete obtained in Examples 10 to 18

[0140]

[0141]

[0142]

[0143] The data in Table 2 shows that when adding sound-insulating aggregate to prepare soundproof concrete, the compressive strength of the resulting concrete shows a negative correlation with the amount of aggregate used. Specifically, as the amount of aggregate increases, the compressive strength of the concrete decreases. However, in addition to the amount of aggregate used, the compressive strength of the aggregate itself is also determined by its cylindrical compressive strength. As the proportion of mineral powder added to the tough compressive layer of the aggregate increases, the strength of the aggregate itself also increases, leading to a gradual increase in the compressive strength of the concrete. Furthermore, the presence of the aggregate has little effect on the expansion and expansion time of the concrete. This is because the aggregate's mostly rounded particles enhance the concrete's fluidity.

[0144] Example 19

[0145] 30 kg of waste aerated concrete particles were mixed with a sodium silicate aqueous solution (30 degrees Baume, modulus 1.5), and surface hardened in a carbon dioxide atmosphere (hardening conditions: carbon dioxide volume fraction 18%, relative humidity 70%, temperature 20°C, temperature uniformity 1°C) to obtain a sound-absorbing porous core;

[0146] The sound-absorbing porous core obtained by the above treatment is poured into a rotary granulator, and the first coupling agent aqueous solution (1% by mass of KH550 silane coupling agent) is sprayed to wet the surface of the sound-absorbing porous core. Then, 20 kg of waste elastic plastic powder, 65 kg of waste rubber powder, 15 kg of sawdust and an adhesive (EVA emulsion and water are mixed in a mass ratio of 1:3) are poured into the rotary granulator, and granulation is performed on the rotary granulator at a speed of 35 r / min. After granulation, it is first dried at 22 ° C for 24 hours and then dried at 165 ° C for 25 minutes. After cooling, an elastic damping layer is formed on the surface of the sound-absorbing porous core to obtain a sound insulation aggregate precursor;

[0147] The sound insulation aggregate precursor obtained by the above treatment is poured into a rotary granulator, and the second coupling agent aqueous solution (KH550 silane coupling agent with a mass fraction of 1%) is sprayed to wet the surface of the sound-absorbing porous core. Then, 50 kg of dehydrated tailings, 40 kg of mineral powder, 10 kg of fly ash, 0.1 kg of fiber and an activator (sodium silicate aqueous solution, sodium hydroxide and water are mixed in a mass ratio of 40:25:80, and the modulus of the sodium silicate aqueous solution is 1.5) are poured into the rotary granulator, and granulation is carried out on the rotary granulator at a speed of 35 r / min to form a tough compressive layer on the surface of the elastic damping layer to obtain the sound insulation aggregate.

[0148] 550 kg of the sound insulation aggregate is mixed with 230 kg of cement, 50 kg of mineral powder, 1 kg of glue powder, 1 kg of magnesium aluminum silicate, 1 kg of diatomaceous earth, 3 kg of emulsion, 280 kg of pure concrete recycled fine aggregate, 210 kg of recycled micropowder, 220 kg of recycled concrete stone powder, 100 kg of hollow floating beads, 5 kg of spherical polystyrene particles, 8 kg of water reducer and 160 kg of water to obtain sound insulation concrete.

[0149] Holes with a spacing of 5 cm were drilled on the surface of the floor slab, and wire-binding steel nails with two grooves were laid in the holes. Hollow fiber filaments were wrapped around the grooves of the wire-binding steel nails to form two layers of hollow fiber grids with a spacing of 1.5 cm on the surface of the floor slab and the wall. The sound-insulating concrete was poured into the hollow fiber grids and cured at room temperature for 7 days to form a sound-insulating concrete layer.

[0150] Example 20

[0151] The mass of the waste rubber powder was adjusted to 50 kg, the mass of the wood chips was adjusted to 30 kg, and other conditions were the same as in Example 19 to prepare sound insulation aggregate.

[0152] Sound-insulating concrete and a sound-insulating concrete layer were prepared according to the conditions of Example 19.

[0153] Example 21

[0154] The mass of the waste elastic plastic powder was adjusted to 25 kg, the mass of the rubber powder was adjusted to 40 kg, and the mass of the wood chips was adjusted to 35 kg. Other conditions were the same as in Example 19 to prepare sound insulation aggregate.

[0155] Sound-insulating concrete and a sound-insulating concrete layer were prepared according to the conditions of Example 19.

[0156] Example 22

[0157] Sound insulation aggregate was prepared according to the conditions of Example 19.

[0158] The mass of the pure concrete recycled fine aggregate was adjusted to 230 kg, and other conditions were the same as in Example 19 to prepare sound insulation concrete and a sound insulation concrete layer.

[0159] Example 23

[0160] Sound insulation aggregate was prepared according to the conditions of Example 19.

[0161] The mass of the sound insulation aggregate was adjusted to 650 kg, the mass of the pure concrete recycled fine aggregate was adjusted to 230 kg, and other conditions were the same as in Example 19 to prepare sound insulation concrete and a sound insulation concrete layer.

[0162] Example 24

[0163] Sound insulation aggregate was prepared according to the conditions of Example 19.

[0164] The mass of the sound insulation aggregate was adjusted to 750 kg, the mass of the pure concrete recycled fine aggregate was adjusted to 230 kg, and other conditions were the same as in Example 19 to prepare sound insulation concrete and a sound insulation concrete layer.

[0165] Example 25

[0166] The mass of waste rubber powder was adjusted to 50 kg, and the mass of sawdust was adjusted to 30 kg to prepare sound insulation aggregate.

[0167] The mass of the sound insulation aggregate was adjusted to 750 kg, the mass of the pure concrete recycled fine aggregate was adjusted to 180 kg, and the other conditions were the same as in Example 19 to prepare sound insulation concrete.

[0168] The spacing between the steel nails was adjusted to 2 cm, the spacing between the hollow fiber grid layers was adjusted to 6 cm, and other conditions were the same as in Example 19 to prepare a sound insulation concrete layer.

[0169] Example 26

[0170] The mass of waste rubber powder was adjusted to 50 kg, and the mass of sawdust was adjusted to 30 kg to prepare sound insulation aggregate.

[0171] The mass of the sound insulation aggregate was adjusted to 750 kg, the mass of the pure concrete recycled fine aggregate was adjusted to 180 kg, and the other conditions were the same as in Example 19 to prepare sound insulation concrete.

[0172] The spacing between the steel nails was adjusted to 2 cm, the spacing between the hollow fiber grid layers was adjusted to 10 cm, and other conditions were the same as in Example 19 to prepare a sound insulation concrete layer.

[0173] Example 27

[0174] The mass of waste rubber powder was adjusted to 50 kg, and the mass of sawdust was adjusted to 30 kg to prepare sound insulation aggregate.

[0175] The mass of the sound insulation aggregate was adjusted to 750 kg, the mass of the pure concrete recycled fine aggregate was adjusted to 180 kg, and the other conditions were the same as in Example 19 to prepare sound insulation concrete.

[0176] The spacing between the steel nails was adjusted to 2 cm, the spacing between the hollow fiber grid layers was adjusted to 15 cm, and other conditions were the same as in Example 19 to prepare a sound insulation concrete layer.

[0177] The sound insulation concrete layers obtained in Examples 19 to 27 were tested for impact sound improvement in accordance with GB / T 19889.8. The compositions / preparation conditions and impact sound improvement test results of the sound insulation concrete layers obtained in Examples 19 to 27 are shown in Table 3.

[0178] Table 3 Composition / preparation conditions and impact sound improvement test results of the sound insulation concrete layers obtained in Examples 19 to 27

[0179]

[0180]

[0181]

[0182] It can be seen from the data in Table 3 that, specifically, the results of Examples 19 to 21 show that when the sound-absorbing porous core and the tough compressive layer of the sound-insulating aggregate are prepared under the same conditions and the amount of sound-absorbing aggregate added in the sound-insulating concrete layer remains unchanged, as the amount of waste rubber powder in the elastic damping layer of the sound-insulating aggregate decreases, the impact sound improvement of the sound-insulating concrete layer also decreases; the results of Examples 22 to 24 show that when the sound-absorbing porous core, the elastic damping layer and the tough compressive layer of the sound-insulating aggregate are prepared under the same conditions, as the amount of sound-absorbing aggregate added in the sound-insulating concrete layer increases, the impact sound improvement of the sound-insulating concrete layer also increases; the results of Examples 25 to 27 show that when other conditions are the same, the networking method of the hollow fiber grid will also affect the impact sound improvement of the sound-insulating concrete layer. In summary, different proportions of the elastic damping layer in the sound insulation aggregate and the networking method of the hollow fiber grid will affect the impact sound improvement of the sound insulation concrete layer. The present invention can prepare various sound insulation requirements for low-frequency, medium-frequency, and high-frequency between floors according to different sound insulation requirements and meet the requirements of level two and above in GBJ118-88 "Code for Sound Insulation Design of Civil Buildings" and GB50352-2005 "General Principles for Design of Civil Buildings".

[0183] Although the above embodiment provides a detailed description of the present invention, it is only a part of the embodiments of the present invention, not all of the embodiments. People can also obtain other embodiments based on this embodiment without creativity, and these embodiments all fall within the scope of protection of the present invention.

Claims

1. A sound-insulating aggregate comprising a sound-absorbing porous core, an elastic damping layer coated on the surface of the sound-absorbing porous core, and a tough compressive layer coated on the surface of the elastic damping layer; The raw materials for preparing the noise-absorbing porous core include waste aerated concrete particles; The raw materials for preparing the elastic damping layer include waste elastic plastic powder, waste rubber powder and sawdust; the mass ratio of the waste elastic plastic powder, waste rubber powder and sawdust is 15-35:45-65:15-35; The raw materials for preparing the toughness and pressure-resistant layer include dewatered tailings, mineral powder, fly ash and fiber; the mass ratio of the dewatered tailings, mineral powder, fly ash and fiber is 30-50:40-60:10-20:0.1-0.2; The dewatered tailings are obtained by dehydrating one or more of municipal sludge, silt and engineering mud through filter pressing; The water content of the municipal sludge, silt and engineering mud is 30-40%; The moisture content of the dehydrated tailings is less than 5%.

2. The sound insulation aggregate according to claim 1, characterized in that The particle size of the sound-absorbing porous core is 5 to 7.5 mm; the thickness of the elastic damping layer is 2 to 3.5 mm; and the thickness of the toughness pressure-resistant layer is 2.5 to 4.5 mm.

3. The sound insulation aggregate according to claim 1, characterized in that The fibers include at least one of polypropylene fibers and glass fibers; and the length of the fibers is 1 to 2 mm.

4. The sound insulation aggregate according to claim 1, characterized in that The particle size of the waste aerated concrete particles is 5 to 7.5 mm; the particle sizes of the waste elastic plastic powder, waste rubber powder and wood chips are independently 0.075 to 0.15 mm; the waste elastic plastic powder includes low-melting-point thermoplastic plastic powder; the low-melting-point thermoplastic plastic powder includes at least one of polyvinyl chloride plastic powder and polypropylene plastic powder; the mass proportion of the low-melting-point thermoplastic plastic powder in the waste elastic plastic powder is 30 to 50%.

5. The method for preparing the sound insulation aggregate according to any one of claims 1 to 4, comprising the following steps: The waste aerated concrete particles are mixed with a sodium silicate aqueous solution and subjected to surface hardening treatment in a carbon dioxide-containing atmosphere to obtain a sound-absorbing porous core; The sound-absorbing porous core, waste elastic plastic powder, waste rubber powder, sawdust, adhesive and a first coupling agent aqueous solution are mixed, and first granulation and drying are performed in sequence to form an elastic damping layer on the surface of the sound-absorbing porous core to obtain a sound insulation aggregate precursor; The sound insulation aggregate precursor, dehydrated tailings, mineral powder, fly ash, fiber, a second coupling agent aqueous solution and an activator are mixed and subjected to a second granulation to form a toughness and compression-resistant layer on the surface of the elastic damping layer to obtain the sound insulation aggregate.

6. The preparation method according to claim 5, characterized in that The sodium silicate aqueous solution has a Baume degree of 25 to 45°Bé; the conditions for the surface hardening treatment include: a volume fraction of carbon dioxide of 11 to 22%, a relative humidity of 60 to 75%, and a temperature of 18.5 to 21.5°C; the drying includes a first drying and a second drying performed sequentially; the first drying temperature is 20 to 25°C and the holding time is 24 hours; the second drying temperature is 120 to 180°C and the holding time is 10 to 30 minutes.

7. A sound-insulating concrete comprising the following raw materials, calculated in parts by mass: 220-300 parts of cement, 30-70 parts of mineral powder, 500-850 parts of sound insulation aggregate, 1-3 parts of rubber powder, 1-3 parts of magnesium aluminum silicate, 1-3 parts of diatomaceous earth, 2-4.5 parts of emulsion, 180-300 parts of pure concrete recycled fine aggregate, 180-250 parts of recycled micro powder, 200-240 parts of recycled concrete stone powder, 80-130 parts of hollow floating beads, 5-10 parts of spherical polystyrene particles, 6-15 parts of water reducer and 145-195 parts of water; The sound insulation aggregate is the sound insulation aggregate according to any one of claims 1 to 4 or the sound insulation aggregate prepared by the preparation method according to any one of claims 5 to 6.

8. Use of the sound-insulating concrete according to claim 7 in sound-insulating building materials.

9. The use according to claim 8, characterized in that The application includes: preparing a sound insulation concrete layer on the upper surface of the floor slab; the thickness of the sound insulation concrete layer is 2.5 to 5 cm; The sound insulation concrete layer comprises a hollow fiber grid composed of hollow fiber filaments and sound insulation concrete poured in the hollow fiber grid.

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