Sound insulation and heat preservation building mortar and preparation method thereof

Abstract

The invention discloses sound-insulation and heat-insulation building mortar and a preparation method thereof, and relates to the technical field of building materials, the sound-insulation and heat-insulation building mortar comprises, by weight, 42-48 parts of a cementing material, 15-25 parts of an auxiliary material, 17-22 parts of lightweight aggregate, 30-35 parts of a functional filler, and 1-2 parts of an additive; the cementing material is a mixture of sulphoaluminate cement and Portland cement; the auxiliary material is a mixture of fly ash and quartz sand, the lightweight aggregate is a mixture of 20-40-mesh hollow vitrified microbeads and 70-90-mesh hollow vitrified microbeads, and the mass ratio of the hollow vitrified microbeads to the hollow vitrified microbeads is 1: (2-3); the functional filler is a mixture of modified waste rubber particles and modified fibers; the additive is a mixture of a polycarboxylate superplasticizer and hydroxypropyl methyl cellulose ether. The mortar disclosed by the invention is good in thermal insulation performance and excellent in mechanical property, the method disclosed by the invention is simple to operate and low in cost, and the prepared mortar is excellent in performance.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, and particularly relates to a sound-insulating and heat-insulating building mortar and a preparation method thereof. Background Art

[0002] With the advancement of the urbanization process and the remarkable improvement of the living quality of residents, urban noise pollution and building energy consumption have become key environmental problems to be solved urgently. As the main carrier of human activities, the heat insulation and sound insulation performance of building floors directly affect indoor comfort, energy utilization efficiency and social harmony. Research shows that the isolation efficiency of existing building floors for solid impact sound is generally insufficient, and most neighborhood disputes stem from the transmission of impact sound between floors. Moreover, more than 35% of building energy consumption is caused by heat loss of the peripheral enclosure structure, which highlights the urgent need for high-performance heat-insulating and sound-insulating materials.

[0003] Traditional heat-insulating and sound-insulating materials usually include portland cement, fine sand, fly ash cenospheres, ceramsite sand, polystyrene foam particles, waste tire rubber powder, rock wool or glass wool fibers, and other additives. The sound insulation principle is, on the one hand, to reflect sound waves through high-density materials to block air sound, and on the other hand, to buffer vibration and absorb impact sound through elastic materials. The polystyrene foam particles in the above materials are easy to burn and release toxic gases at high temperatures, posing a fire hazard and being gradually phased out in heat-insulating materials; although rock wool and glass wool have advantages such as fire prevention and heat insulation, they are not only complex to install but also costly and have high hygroscopicity. The waste rubber powder is processed from rubber products such as tires and has the viscoelasticity and damping characteristics of a polymer elastic material. After being incorporated into the mortar, it can absorb sound wave energy through elastic deformation, especially high-frequency impact sound, thereby reducing the transmission efficiency of sound waves in the floor structure. Moreover, the particle morphology of the rubber powder forms an irregular pore structure, which can enhance the heat insulation performance of the mortar to a certain extent. And the recycling of waste rubber powder as industrial waste reduces landfill pollution and at the same time reduces the production cost of the mortar. However, the mechanical strength of waste rubber powder is reduced, and its addition to the mortar will reduce the strength of the mortar to a certain extent, thus limiting its application in the mortar.

[0004] The patent with the application number 201410331071.X provides a modified waste tire rubber powder heat-insulating mortar and a preparation method thereof, including the following components in parts by weight: 100 parts of cement, 50 parts of water, 56 - 168 parts of sand, 112 - 224 parts of waste tire rubber powder, and 1.12 - 4.48 parts of silane coupling agent. Although the addition of the silane coupling agent in the above technology can improve the bonding force between the waste tire rubber powder and the mortar to a certain extent, the silane coupling agent is directly coated with a poor coating rate, and the mechanical properties of the mortar cannot be improved well. Therefore, it is of great significance to provide a mortar with good mechanical properties, sound insulation and heat insulation performance. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: aiming at the deficiencies existing in the prior art, to provide a sound-insulating and heat-insulating building mortar and a preparation method thereof. This sound-insulating and heat-insulating building mortar not only has good sound-insulating performance, excellent heat-insulating performance, but also has excellent mechanical properties. Moreover, the method of the present invention is simple to operate, low in cost, and the prepared mortar has excellent properties.

[0006] To solve the above technical problems, the technical solution of the present invention is:

[0007] A sound-insulating and heat-insulating building mortar, in parts by weight, comprises 42-48 parts of a cementitious material, 15-25 parts of an auxiliary material, 17-22 parts of a lightweight aggregate, 30-35 parts of a functional filler, and 1-2 parts of an admixture; the cementitious material is a mixture of a sulfoaluminate cement and a portland cement; the auxiliary material is a mixture of fly ash and quartz sand, the lightweight aggregate is a mixture of 20-40 mesh hollow vitrified microspheres and 70-90 mesh hollow vitrified microspheres, and the mass ratio of the two is 1:(2-3); the functional filler is a mixture of modified waste rubber particles and modified fibers; the admixture is a mixture of a polycarboxylate water reducer and a hydroxypropyl methylcellulose ether.

[0008] Preferably, the mass ratio of the sulfoaluminate cement to the portland cement is (12-15):(30-33); the mass ratio of the fly ash to the quartz sand is 5-10:10-15; the mass ratio of the polycarboxylate water reducer to the hydroxypropyl methylcellulose ether is (0.2-0.3):(0.3-0.5); the mass ratio of the modified waste rubber particles to the modified fibers is (19-26):(3-5), and the fibers are a mixture of basalt fibers / aramid fibers / cellulose nanofibers, and the mass ratio of basalt fibers, aramid fibers, and cellulose nanofibers is 2-3:1-2:1.

[0009] Preferably, the preparation method of the modified waste rubber particles is:

[0010] The waste rubber particles are soaked in an alkaline solution and then oxidized by an oxidant to obtain activated rubber particles;

[0011] The activated rubber particles are subjected to a primary modification treatment in a tannic acid solution to obtain primary modified rubber particles;

[0012] Tetraethyl orthosilicate, ethanol, and deionized water are mixed, hydrochloric acid is added to adjust the pH to 2-3, and stirring is carried out for pre-hydrolysis treatment to obtain a pre-hydrolyzed sol. Then, polyethylene glycol and a silane coupling agent KH792 are added, stirring is continued, the primary modified rubber particles are added, and a water bath reaction is carried out. After the reaction is completed, centrifugation is carried out. After centrifugation and precipitation, washing and drying are carried out to obtain modified waste rubber particles.

[0013] Preferably, the alkaline solution is a sodium hydroxide solution with a concentration of 5 wt%, the temperature for the soaking treatment is 60 - 70 °C, the time is 2 - 6 h, and the solid-liquid ratio is 1:(5 - 10); the oxidant is a hydrogen peroxide solution with a concentration of 3 - 10 wt%, and a sulfuric acid solution is added to adjust its pH to 3 - 5. The solid-liquid ratio during oxidation is 1:(5 - 10), and it is refluxed at 50 - 80 °C for 1 - 3 h.

[0014] Preferably, the concentration of the tannic acid solution is 1 - 5 wt%; the pH for the first modification treatment is 3 - 5, the temperature is 50 - 70 °C, and the time is 4 - 6 h.

[0015] Preferably, the volume ratio of tetraethyl orthosilicate, ethanol, and deionized water is 1:(4 - 5):(1 - 2). The temperature for the pre-hydrolysis treatment is room temperature, and the time is 30 - 60 min; the polyethylene glycol is polyethylene glycol 2000 - 6000, and the mass ratio of polyethylene glycol to tetraethyl orthosilicate is 1:(1 - 2); the addition amount of the silane coupling agent KH792 is 1 - 5 wt% of the mass of the pre-hydrolyzed sol, and the addition amount of the first-modified rubber particles to the mass of the pre-hydrolyzed sol is 1:(20 - 25); the temperature for the water bath reaction is 40 °C, and the time is 6 - 8 h.

[0016] Preferably, the preparation method of the modified fiber is as follows:

[0017] Mix aramid fiber, potassium hydroxide, deionized water, and DMSO, and stir at room temperature to obtain a pretreatment solution. Slowly add deionized water for dilution treatment, and finally wash with deionized water to obtain an aramid fiber dispersion;

[0018] Mix and stir the aramid fiber dispersion, cellulose nanofiber dispersion, and basalt fiber to obtain a mixed fiber dispersion. Add a methanesulfonic acid solution to the mixed fiber dispersion, and perform a hydrothermal reaction after mixing. The modified fiber is washed and dried, and then added to the hydrolyzed solution of the silane coupling agent for cross-linking reaction. After the reaction, centrifuge, wash the centrifuged precipitate, and dry to obtain the modified fiber.

[0019] Preferably, the dosage ratio of aramid fiber, potassium hydroxide, deionized water, and DMSO is 1 g:(1 - 2) g:20 ml:500 ml; the stirring time at room temperature is 3 - 4 h, and the stirring speed is 500 - 800 revolutions per minute; the dropping rate of deionized water during the dilution treatment is 40 - 50 ml / h, the addition amount of deionized water during the dilution treatment is 1 - 2 times the volume of the pretreatment solution, and continue to stir at room temperature for 1 - 1.5 h after the dropping of deionized water ends during the dilution treatment.

[0020] Preferably, the molar ratio of aminomethanesulfonic acid to sodium hydroxide is 1:(1.2 - 1.3); the mass ratio of aminomethanesulfonic acid to mixed fibers is 1:(2 - 3); the temperature of the hydrothermal reaction is 120 °C, and the time of the hydrothermal reaction is 15 - 20 h.

[0021] Preferably, the preparation of the silane coupling agent hydrolysis solution is as follows: dissolve the silane coupling agent in an ethanol solution, adjust the pH of the solution to 4 - 5, and stir and hydrolyze for 30 - 60 min at room temperature to obtain it.

[0022] Preferably, the silane coupling agent is silane coupling agent KH550, the addition amount of silane coupling agent KH550 is 1 - 5 wt% of the mass of the mixed fibers, the temperature of the crosslinking reaction is 50 - 70 °C, and the time is 1 - 2 h.

[0023] In a second aspect, the present invention provides a method for preparing a sound - insulating and heat - insulating building mortar, comprising the following steps:

[0024] According to the metering ratio, add sulfoaluminate cement and Portland cement into a mixer, stir and mix for 4 - 5 min, then add hollow vitrified microspheres with a particle size of 20 - 40 mesh, hollow vitrified microspheres with a particle size of 70 - 90 mesh, modified waste rubber particles, modified fibers, fly ash, and quartz sand, continue to stir for 8 - 10 min, and finally add polycarboxylate water - reducing agent and hydroxypropyl methylcellulose ether, and stir and mix for 20 - 30 min to obtain it.

[0025] Due to the adoption of the above - mentioned technical solutions, the beneficial effects of the present invention are:

[0026] The present invention provides a sound-insulating and heat-insulating building mortar. By adding modified waste rubber particles and modified fibers, on the premise of ensuring excellent mechanical properties of the mortar, the sound-insulating and heat-insulating properties of the mortar are effectively improved. In terms of the improvement of sound-insulating properties: The elastic modulus of the waste rubber particles is relatively low. After combining with the cement matrix, an elastic network is formed. When sound waves propagate, the rubber particles absorb vibration energy through elastic deformation and use their porous structure to scatter the sound wave path, significantly reducing the propagation efficiency of high-frequency impact sound. In addition, basalt fiber and aramid fiber further dissipate sound wave energy by increasing the internal damping of the matrix. Moreover, the nano-scale size of cellulose nanofibers can form a dense network in the cement matrix, and reflect sound waves through nano-pores and interfaces. The surface roughness of the modified fibers increases, enhancing the scattering effect of sound waves at the interface, thereby improving the sound-insulating performance of the mortar. In terms of the improvement of heat-insulating properties: The combined addition of waste rubber particles and hollow glass microspheres significantly increases the porosity of the mortar, prolongs the heat conduction path, reduces the thermal conductivity of the mortar. Cellulose nanofibers optimize the pore structure and reduce the pore connectivity, further suppressing heat convection. Basalt fiber and aramid fiber can reflect infrared radiation and reduce heat radiation loss. In terms of the improvement of mechanical properties: Basalt fiber and aramid fiber form a bridging structure through three-dimensional random distribution, preventing the expansion of micro-cracks; the rubber particles relieve stress concentration through elastic deformation, changing the failure mode from brittle to ductile, and thus improving the strength of the mortar.

[0027] When the waste rubber particles of the present invention are modified, the grease and impurities on the rubber surface are removed through alkali treatment and oxidation treatment to form a rough surface, enhancing the mechanical bite with the matrix; tannic acid containing phenolic hydroxyl groups is adsorbed on the rubber surface through hydrogen bonds or chemical bonds, increasing the polar groups on the rubber surface and enhancing the bonding force with the subsequent silica sol coating. During the formation of the SiO2 coating by hydrolysis of tetraethyl orthosilicate, polyethylene glycol and silane coupling agent KH792 are added for crosslinking to form a rigid-elastic composite structure, improving the interfacial transition zone between the rubber particles and the cement matrix and reducing stress concentration. For the modified fibers, the surface activity and dispersibility of aramid fibers are improved by treatment with KOH / DMSO. The cellulose nanofibers with a high specific surface area and the basalt fibers with a high modulus form a multi-scale reinforcement network to inhibit crack propagation. The combined treatment of crosslinking with aminomethanesulfonic acid and silane coupling agent KH550 enhances the chemical bonding between the fibers and the cement matrix, maximizing the stress transfer efficiency. After testing, the 28-day compressive strength of the sound-insulating and heat-insulating mortar of the present invention reaches 65.8 MPa.

[0028] In the present invention, the closed-cell structure and low thermal conductivity of the modified waste rubber particles effectively reduce the overall thermal conductivity of the mortar. The SiO2 coating of the modified waste rubber particles and the modified fibers form a multi-level interface, increasing phonon scattering and hindering heat transfer, further improving the heat-insulating performance of the mortar. After testing, the thermal conductivity of this sound-insulating and heat-insulating mortar is as low as 0.029 W / m·k.

[0029] In the present invention, the modified waste rubber particles dissipate acoustic energy through viscoelastic deformation, reducing the propagation of medium and high frequency sound waves. The fiber network in the mortar, especially aramid fiber and basalt fiber, absorbs low frequency acoustic energy through vibration friction and interface slip, forming a broadband sound insulation effect and improving the sound insulation performance of the mortar. After testing, the standardized impact sound pressure level of this sound insulation and thermal insulation mortar is as low as 27 dB. Specific Embodiments

[0030] In order to more clearly understand the above objects, features and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0031] Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present invention, rather than all the embodiments.

[0032] To further understand the present invention, the preferred embodiments of the present invention will be described below in conjunction with the embodiments. However, it should be understood that these descriptions are only for further explaining the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0033] The performance parameters of each raw material in the following examples, comparative examples, application examples and application comparative examples are as follows. Other raw materials are all ordinary commercially available products without special instructions.

[0034] Waste rubber particles: particle size 20 mesh, bulk density 488 kg / m 3 , Huancheng Rubber Recycling Co., Ltd., Baotou City;

[0035] Basalt fiber: length 18 mm, monofilament diameter 15 μm;

[0036] Aramid fiber: purchased from DuPont;

[0037] Cellulose nanofiber: diameter 10 - 100 nm, length 1 - 10 μm;

[0038] Sulfoaluminate cement: 42.5 grade sulfoaluminate cement, Tangshan Polar Bear Building Materials Co., Ltd.;

[0039] Portland cement: ordinary Portland cement P.O 42.5, initial setting time 202 min, Xiamen Shunshu Construction Engineering Co., Ltd.;

[0040] Fly ash: specific surface area 860 m 2 / kg, average particle size 8.70 μm;

[0041] Quartz sand: fineness modulus is 2.7;

[0042] Hollow vitrified microspheres with 20 - 40 mesh and 70 - 90 mesh: Qinhuangdao Qinhuang Glass Microspheres Co., Ltd.;

[0043] Hydroxypropyl methyl cellulose ether: viscosity 100000 mpa·s, produced by Zhejiang Zhongwei Pharmaceutical Co., Ltd.

[0044] Example 1

[0045] Preparation method of modified waste rubber particles, comprising the following steps:

[0046] (1) Add waste rubber particles to a sodium hydroxide solution with a concentration of 5 wt%, control the solid - liquid ratio to be 1:8, soak and treat at 60°C for 3 h, then filter. After the filtered precipitate is dried, place it in a hydrogen peroxide solution with a concentration of 3 - 10 wt%, control the solid - liquid ratio to be 1:10, adjust the pH to 4, and treat at 60°C for 2 h. After completion, filter, and after the filtered precipitate is washed and dried, activated rubber particles are obtained;

[0047] (2) Place the activated rubber particles in a tannic acid solution with a concentration of 3 wt%, control the solid - liquid ratio to be 1:15, adjust the solution pH to 5, and perform a primary modification treatment at 60°C for 5 h to obtain primary - modified rubber particles;

[0048] (3) Mix 3 ml of tetraethyl orthosilicate, 15 ml of ethanol, and 5 ml of deionized water, add hydrochloric acid to adjust the pH to 3, stir and perform a pre - hydrolysis treatment at room temperature for 40 min to obtain a pre - hydrolyzed sol. Then add polyethylene glycol 4000 and silane coupling agent KH792 (the mass ratio of polyethylene glycol to tetraethyl orthosilicate is 1:1, and the addition amount of silane coupling agent KH792 is 2 wt% of the mass of the pre - hydrolyzed sol), continue to stir for 30 min, add the primary - modified rubber particles (the addition amount of the primary - modified rubber particles is 1:20 of the mass of the pre - hydrolyzed sol), react in a water bath at 40°C for 7 h. After the reaction is completed, centrifuge, and after the centrifuged precipitate is washed and dried, modified waste rubber particles are obtained.

[0049] Example 2

[0050] Preparation method of modified waste rubber particles, comprising the following steps:

[0051] (1) Add waste rubber particles to a sodium hydroxide solution with a concentration of 5 wt%, control the solid - liquid ratio to be 1:10, soak and treat at 60°C for 6 h, then filter. After the filtered precipitate is dried, place it in a hydrogen peroxide solution with a concentration of 8 wt%, control the solid - liquid ratio to be 1:10, adjust the pH to 4, and treat at 70°C for 3 h. After completion, filter, and after the filtered precipitate is washed and dried, activated rubber particles are obtained;

[0052] (2) Place the activated rubber particles in a tannic acid solution with a concentration of 5 wt%, control the solid-liquid ratio to be 1:20, adjust the pH of the solution to 4, and perform a primary modification treatment at 60 °C for 5 h to obtain primary-modified rubber particles;

[0053] (3) Mix 3 ml of tetraethyl orthosilicate, 15 ml of ethanol, and 5 ml of deionized water, add hydrochloric acid to adjust the pH to 3, and perform a pre-hydrolysis treatment by stirring at room temperature for 60 min to obtain a pre-hydrolyzed sol. Then add polyethylene glycol 4000 and silane coupling agent KH792 (the mass ratio of polyethylene glycol to tetraethyl orthosilicate is 1:2, and the addition amount of silane coupling agent KH792 is 4 wt% of the mass of the pre-hydrolyzed sol), continue stirring for 30 min, add the primary-modified rubber particles (the addition amount of the primary-modified rubber particles is 1:25 of the mass of the pre-hydrolyzed sol), react in a water bath at 40 °C for 7 h. After the reaction, centrifuge, wash the centrifuged precipitate, and dry to obtain modified waste rubber particles.

[0054] Example 3

[0055] A preparation method of modified fibers, comprising the following steps:

[0056] (1) Mix 1 g of aramid fiber, 1 g of potassium hydroxide, 20 ml of deionized water, and 500 ml of DMSO, stir at room temperature and 500 revolutions per minute for 3 h to obtain a pretreatment solution. Dropwise add deionized water to the pretreatment solution for dilution treatment at a rate of 50 ml / h (the addition amount of deionized water is 2 times the volume of the pretreatment solution). After the addition of deionized water is completed, continue stirring for 1.2 h; finally, wash with deionized water to obtain an aramid fiber dispersion with a concentration of 4 wt%;

[0057] (2) Mix and stir the aramid fiber dispersion, the cellulose nanofiber dispersion, and basalt fiber (the mass ratio of aramid fiber, cellulose nanofiber, and basalt fiber is 1:1:2) to obtain a mixed fiber dispersion. Add a methanesulfonic acid solution (prepared by mixing methanesulfonic acid with 50 ml of a 1 mol / L sodium hydroxide solution, and the molar ratio of methanesulfonic acid to sodium hydroxide is 1:1.2) to the mixed fiber dispersion, control the mass ratio of methanesulfonic acid to the mixed fiber to be 1:2. After mixing, place the mixed solution in a reaction kettle and perform a hydrothermal reaction at 120 °C for 18 h. After the reaction, cool the reaction solution to room temperature, filter, wash the filtered precipitate, dry, and add it to a silane coupling agent hydrolysis solution (1 g of silane coupling agent KH550 is dissolved in 50 ml of an ethanol solution (the volume ratio of ethanol to deionized water is 9:1), adjust the pH of the solution to 4, and stir for hydrolysis at room temperature for 60 min to prepare). The addition amount of silane coupling agent KH550 is 2 wt% of the mass of the mixed fiber. Perform a cross-linking reaction at 60 °C for 2 h. After the reaction, centrifuge, wash the centrifuged precipitate, and dry to obtain modified fibers.

[0058] Example 4

[0059] Preparation method of modified fiber, comprising the following steps:

[0060] (1) Mix 1 g of aramid fiber, 2 g of potassium hydroxide, 20 ml of deionized water and 500 ml of DMSO, stir and process for 4 h at room temperature and 800 revolutions per minute to obtain a pretreatment solution. Dropwise add deionized water to the pretreatment solution for dilution treatment at a rate of 50 ml / h (the added amount of deionized water is 2 times the volume of the pretreatment solution). After the addition of deionized water is completed, continue stirring for 1.5 h; finally, wash with deionized water to obtain an aramid fiber dispersion with a concentration of 5 wt%;

[0061] (2) Mix and stir the aramid fiber dispersion, cellulose nanofiber dispersion and basalt fiber (the mass ratio of aramid fiber, cellulose nanofiber and basalt fiber is 2:1:3) to obtain a mixed fiber dispersion. Add a methanesulfonic acid solution (prepared by mixing methanesulfonic acid with 50 ml of a sodium hydroxide solution with a concentration of 1 mol / L, and the molar ratio of methanesulfonic acid to sodium hydroxide is 1:1.3) to the mixed fiber dispersion, control the mass ratio of methanesulfonic acid to the mixed fiber to be 1:3. After mixing, place the mixed solution in a reaction kettle and carry out a hydrothermal reaction at 120 °C for 18 h. After the reaction is completed, cool the reaction solution to room temperature, filter, wash the filtered precipitate, dry it and add it to a silane coupling agent hydrolysis solution (1 g of silane coupling agent KH550 is dissolved in 50 ml of an ethanol solution (the volume ratio of ethanol to deionized water is 9:1), adjust the pH of the solution to 5, stir and hydrolyze at room temperature for 50 min to prepare). The addition amount of silane coupling agent KH550 is 4 wt% of the mass of the mixed fiber. Carry out a cross-linking reaction at 60 °C for 2 h. After the reaction is completed, centrifuge, wash the centrifuged precipitate and dry it to obtain the modified fiber.

[0062] Application Example 1

[0063] Preparation method of a sound-insulating and heat-insulating building mortar, comprising the following steps:

[0064] S1: Weigh 45 parts of a gelling material (the mass ratio of sulfoaluminate cement to Portland cement is 12:30), 20 parts of auxiliary materials (the mass ratio of fly ash to quartz sand is 7:12), 20 parts of lightweight aggregate (a mixture of 20-40 mesh hollow vitrified microspheres and 70-90 mesh hollow vitrified microspheres, and the mass ratio of the two is 1:2), 30 parts of functional filler (the mass ratio of modified waste rubber particles to modified fiber is 5:1), and 2 parts of admixtures (the mass ratio of polycarboxylate water reducer to hydroxypropyl methyl cellulose ether is 0.2:0.3) according to the metering ratio;

[0065] S2: Add sulfoaluminate cement and portland cement into a blender, stir and mix them for 5 min under the condition of 800 revolutions per minute, then add hollow vitrified microspheres with a size of 20-40 mesh, hollow vitrified microspheres with a size of 70-90 mesh, modified waste rubber particles prepared in Example 1, modified nanofibers prepared in Example 3, fly ash, and quartz sand, continue to stir for 10 min, and finally add polycarboxylate water reducer and hydroxypropyl methyl cellulose ether, stir and mix for 30 min to obtain the product.

[0066] Application Example 2

[0067] A preparation method of a sound-insulating and heat-insulating building mortar, comprising the following steps:

[0068] S1: Weigh 47 parts of cementitious materials (the mass ratio of sulfoaluminate cement to portland cement is 15:30), 22 parts of auxiliary materials (the mass ratio of fly ash to quartz sand is 8:10), 20 parts of lightweight aggregates (a mixture of hollow vitrified microspheres with a size of 20-40 mesh and hollow vitrified microspheres with a size of 70-90 mesh, and the mass ratio of the two is 1:3), 32 parts of functional fillers (the mass ratio of modified waste rubber particles to modified fibers is 22:5), and 1.5 parts of admixtures (the mass ratio of polycarboxylate water reducer to hydroxypropyl methyl cellulose ether is 0.3:0.5) according to the measurement ratio;

[0069] S2: Add sulfoaluminate cement and portland cement into a blender, stir and mix them for 5 min under the condition of 1000 revolutions per minute, then add hollow vitrified microspheres with a size of 20-40 mesh, hollow vitrified microspheres with a size of 70-90 mesh, modified waste rubber particles prepared in Example 1, modified fibers prepared in Example 4, fly ash, and quartz sand, continue to stir for 10 min, and finally add polycarboxylate water reducer and hydroxypropyl methyl cellulose ether, stir and mix for 30 min to obtain the product.

[0070] Application Example 3

[0071] A preparation method of a sound-insulating and heat-insulating building mortar, comprising the following steps:

[0072] S1: Weigh 45 parts of cementitious materials (the mass ratio of sulfoaluminate cement to portland cement is 15:32), 23 parts of auxiliary materials (the mass ratio of fly ash to quartz sand is 7:12), 21 parts of lightweight aggregates (a mixture of hollow vitrified microspheres with a size of 20-40 mesh and hollow vitrified microspheres with a size of 70-90 mesh, and the mass ratio of the two is 1:3), 31 parts of functional fillers (the mass ratio of modified waste rubber particles to modified fibers is 24:4), and 2 parts of admixtures (the mass ratio of polycarboxylate water reducer to hydroxypropyl methyl cellulose ether is 0.25:0.3) according to the measurement ratio;

[0073] S2: Add sulfoaluminate cement and Portland cement into a mixer, stir and mix for 5 min under the condition of 1000 r / min, then add hollow vitrified microspheres with a particle size of 20 - 40 mesh, hollow vitrified microspheres with a particle size of 70 - 90 mesh, modified waste rubber particles prepared in Example 2, modified fibers prepared in Example 3, fly ash, and quartz sand, continue to stir for 10 min, and finally add polycarboxylate water reducer and hydroxypropyl methyl cellulose ether, stir and mix for 30 min to obtain the product.

[0074] Application Example 4

[0075] A preparation method of a sound-insulating and heat-insulating building mortar includes the following steps:

[0076] S1: Weigh 48 parts of cementitious materials (the mass ratio of sulfoaluminate cement to Portland cement is 15:33), 25 parts of auxiliary materials (the mass ratio of fly ash to quartz sand is 10:10), 21 parts of lightweight aggregate (a mixture of hollow vitrified microspheres with a particle size of 20 - 40 mesh and hollow vitrified microspheres with a particle size of 70 - 90 mesh, and the mass ratio of the two is 1:3), 33 parts of functional fillers (the mass ratio of modified waste rubber particles to modified fibers is 25:4), and 2 parts of admixtures (the mass ratio of polycarboxylate water reducer to hydroxypropyl methyl cellulose ether is 0.3:0.4) according to the measurement ratio;

[0077] S2: Add sulfoaluminate cement and Portland cement into a mixer, stir and mix for 5 min under the condition of 1000 r / min, then add hollow vitrified microspheres with a particle size of 20 - 40 mesh, hollow vitrified microspheres with a particle size of 70 - 90 mesh, modified waste rubber particles prepared in Example 2, modified fibers prepared in Example 4, fly ash, and quartz sand, continue to stir for 10 min, and finally add polycarboxylate water reducer and hydroxypropyl methyl cellulose ether, stir and mix for 30 min to obtain the product.

[0078] To verify the influence of the modification of waste rubber particles on the properties of the mortar, the following Comparative Examples 1 - 6 and Application Comparative Examples 1 - 7 are described in detail.

[0079] Comparative Example 1

[0080] The difference between this comparative example and Example 1 is that the waste rubber particles are not modified, and other operations are the same as those in Example 1.

[0081] Comparative Example 2

[0082] The difference between this comparative example and Example 1 is that step (2) is not included, and other operations are the same as those in Example 1.

[0083] Comparative Example 3

[0084] The difference between this comparative example and Example 1 is that in step (3), an equal amount of silane coupling agent KH792 is used to replace polyethylene glycol 4000, and other operations are the same as those in Example 1.

[0085] Comparative Example 4

[0086] The difference between this comparative example and Example 1 is that in step (3), an equal amount of polyethylene glycol 4000 is used to replace silane coupling agent KH792, and other operations are the same as those in Example 1.

[0087] Comparative Example 5

[0088] The difference between this comparative example and Example 1 is that in step (3), neither polyethylene glycol 4000 nor silane coupling agent KH792 is added, and other operations are the same as those in Example 1.

[0089] Comparative Example 6

[0090] The difference between this comparative example and Example 1 is that step (3) is not included, and other operations are the same as those in Example 1.

[0091] Application Comparative Example 1

[0092] The difference between this application comparative example and Application Example 1 is that an equal amount of waste rubber particles from Comparative Example 1 are used to replace the modified waste rubber particles prepared in Example 1 of Application Example 1, and other operations are the same as those in Application Example 1.

[0093] Application Comparative Example 2

[0094] The difference between this application comparative example and Application Example 1 is that an equal amount of waste rubber particles from Comparative Example 2 are used to replace the modified waste rubber particles prepared in Example 1 of Application Example 1, and other operations are the same as those in Application Example 1.

[0095] Application Comparative Example 3

[0096] The difference between this application comparative example and Application Example 1 is that an equal amount of waste rubber particles from Comparative Example 3 are used to replace the modified waste rubber particles prepared in Example 1 of Application Example 1, and other operations are the same as those in Application Example 1.

[0097] Application Comparative Example 4

[0098] The difference between this application comparative example and Application Example 1 is that an equal amount of waste rubber particles from Comparative Example 4 are used to replace the modified waste rubber particles prepared in Example 1 of Application Example 1, and other operations are the same as those in Application Example 1.

[0099] Application Comparative Example 5

[0100] The difference between the comparative example of this application and Application Example 1 lies in that: the waste rubber particles of Comparative Example 5 in equal amount are used to replace the modified waste rubber particles prepared in Example 1 of Application Example 1, and other operations are the same as those in Application Example 1.

[0101] Comparative Example 6 of the application

[0102] The difference between the comparative example of this application and Application Example 1 lies in that: the waste rubber particles of Comparative Example 6 in equal amount are used to replace the modified waste rubber particles prepared in Example 1 of Application Example 1, and other operations are the same as those in Application Example 1.

[0103] Comparative Example 7 of the application

[0104] The difference between the comparative example of this application and Application Example 1 lies in that: the modified aramid fiber / cellulose nanofiber / basalt fiber prepared in Example 3 in equal amount is used to replace the modified waste rubber particles in Example 1, and other operations are the same as those in Application Example 1.

[0105] Test 1:

[0106] Referring to the requirements in GB / T26000-2010 "Expanded vitrified microbead thermal insulation mortar", the mortars and water of the above Application Examples 1-4 and Comparative Examples 1-7 of the application are mixed and prepared with a water-binder ratio of 0.55. The obtained specimens are respectively poured into molds, vibrated on a vibrating table for 30 s, demolded after being sealed for 24 h, and cured for 28 d under standard curing conditions (temperature (20±2)°C, relative humidity>95%).

[0107] Refer to GB / T 176771-1999 "Test Method for Strength of Cement Mortar" (ISO method) to test the compressive strength and flexural strength of the specimens.

[0108] Refer to GB / T 20473-2021 "Building Thermal Insulation Mortar" to test the thermal conductivity of the specimens. Refer to GB / T19889.6-2005 and GB 50121-2005 to test the normalized impact sound pressure level of the specimens and evaluate the sound insulation effect of the specimens.

[0109] The test results are shown in Table 1,

[0110] Table 1

[0111]

[0112] As can be seen from the test results in Table 1, compared with the application examples, in Comparative Examples 1-7 of the application, since the necessary technical solutions were not adopted, their performance in corresponding performance tests was significantly worse than that of the application examples. Specifically, in Comparative Example 1 of the application, the waste rubber particles were not modified, resulting in poor interfacial bonding with the cement matrix and a significant reduction in strength. In Comparative Example 2 of the application, the surface of the waste rubber particles was not treated with tannic acid, resulting in a reduction in the hydroxyl functional groups on the surface of the waste rubber particles, a low grafting rate of the silane coupling agent, and weak interfacial bonding. In Comparative Examples 3-5 of the application, the synergistic effect of polyethylene glycol and KH792 was absent, resulting in uneven coating of silica sol. In Comparative Example 6 of the application, the surface of the waste rubber particles was not coated with silica sol, resulting in the worst interfacial bonding and the lowest strength. In Comparative Example 7 of the application, although the fiber reinforcement effect can effectively improve the strength of the mortar, the amount of thermal insulation functional filler is reduced and the thermal insulation performance is lowered. In addition, in Comparative Examples 1-6 of the application, the interfacial bonding of unmodified waste rubber particles, modified waste rubber particles or modified fibers was poor, resulting in uneven pore structure, reduced acoustic wave attenuation ability, and increased thermal conductivity. In Comparative Example 7, after replacing the modified waste rubber particles with modified fibers, the porous sound absorption characteristics of the waste rubber particles were lacking, and the sound insulation effect was slightly worse than that of Application Example 1.

[0113] In summary, the waste rubber particles were sequentially modified by alkali-hydrogen peroxide activation, tannic acid grafting, and silica sol coating, significantly improving the interfacial bonding strength with the matrix and the dispersibility of functional fillers. During the specific modification process, polyethylene glycol can improve dispersibility, KH792 can improve the interfacial bonding between waste rubber particles and the matrix, and the modified fibers form a three-dimensional network through hydrothermal cross-linking. They synergize with the modified waste rubber particles and hollow glass microspheres, not only improving the compressive strength of the mortar but also effectively improving the thermal insulation performance and sound insulation performance of the mortar.

[0114] Test Two:

[0115] To verify the influence of fiber modification on the performance of mortar, the following will be described in detail through Comparative Examples 7-12 and Application Comparative Examples 8-15.

[0116] Comparative Example 7

[0117] The difference between this comparative example and Example 3 is that the aramid fiber / cellulose nanofiber / basalt fiber is not modified, and other operations are the same as in Example 3.

[0118] Comparative Example 8

[0119] The difference between this comparative example and Example 3 is that basalt fiber is not added, and the dosage ratio of aramid fiber to cellulose nanofiber and other operations are the same as in Example 3.

[0120] Comparative Example 9

[0121] The difference between this comparative example and Example 3 lies in that: aramid fiber is not added, and the dosage ratio of basalt fiber to cellulose nanofiber and other operations are the same as those in Example 3.

[0122] Comparative Example 10

[0123] The difference between this comparative example and Example 3 lies in that: cellulose nanofiber is not added, and the dosage ratio of basalt fiber to aramid fiber and other operations are the same as those in Example 3.

[0124] Comparative Example 11

[0125] The difference between this comparative example and Example 3 lies in that: the process of treating with methanesulfonic acid is not included, and other operations are the same as those in Example 3.

[0126] Comparative Example 12

[0127] The difference between this comparative example and Example 3 lies in that: the process of treating with silane coupling agent KH550 is not included, and other operations are the same as those in Example 3.

[0128] Applied Comparative Example 8

[0129] The difference between this applied comparative example and Applied Example 1 lies in that: the modified aramid fiber / cellulose nanofiber / basalt fiber prepared in Example 3 in Applied Example 1 is replaced with the same amount of aramid fiber / cellulose nanofiber / basalt fiber in Comparative Example 7, and other operations are the same as those in Applied Example 1.

[0130] Applied Comparative Example 9

[0131] The difference between this applied comparative example and Applied Example 1 lies in that: the modified aramid fiber / cellulose nanofiber / basalt fiber prepared in Example 3 in Applied Example 1 is replaced with the same amount of modified fiber in Comparative Example 8, and other operations are the same as those in Applied Example 1.

[0132] Applied Comparative Example 10

[0133] The difference between this applied comparative example and Applied Example 1 lies in that: the modified aramid fiber / cellulose nanofiber / basalt fiber prepared in Example 3 in Applied Example 1 is replaced with the same amount of modified fiber in Comparative Example 9, and other operations are the same as those in Applied Example 1.

[0134] Applied Comparative Example 11

[0135] The difference between this applied comparative example and Applied Example 1 lies in that: the modified aramid fiber / cellulose nanofiber / basalt fiber prepared in Example 3 in Applied Example 1 is replaced with the same amount of modified fiber in Comparative Example 10, and other operations are the same as those in Applied Example 1.

[0136] Applied Comparative Example 12

[0137] The difference between the comparative example of this application and Application Example 1 lies in that: an equal amount of the modified fiber of Comparative Example 11 is used to replace the modified aramid fiber / cellulose nanofiber / basalt fiber prepared in Example 3 of Application Example 1, and other operations are the same as those in Application Example 1.

[0138] Application Comparative Example 13

[0139] The difference between the comparative example of this application and Application Example 1 lies in that: an equal amount of the modified fiber of Comparative Example 10 is used to replace the modified aramid fiber / cellulose nanofiber / basalt fiber prepared in Example 3 of Application Example 1, and other operations are the same as those in Application Example 1.

[0140] Application Comparative Example 14

[0141] The difference between the comparative example of this application and Application Example 1 lies in that: an equal amount of the modified waste rubber particles prepared in Example 1 is used to replace the modified aramid fiber / cellulose nanofiber / basalt fiber prepared in Example 3, and other operations are the same as those in Application Example 1.

[0142] Application Comparative Example 15

[0143] The difference between the comparative example of this application and Application Example 1 lies in that: neither the modified waste rubber particles prepared in Example 1 nor the modified aramid fiber / cellulose nanofiber / basalt fiber prepared in Example 3 is added, and other operations are the same as those in Application Example 1.

[0144] Referring to the requirements in GB / T26000-2010 "Expanded Vermiculite Thermal Insulation Mortar", the mortars and water of the above Application Examples 1-4 and Application Comparative Examples 1-7 were mixed and prepared with a water-binder ratio of 0.55. The obtained specimens were respectively poured into molds, vibrated on a vibrating table for 30 s, demolded after being sealed for 24 h, and cured for 28 d under standard curing conditions (temperature (20±2)°C, relative humidity > 95%).

[0145] The compressive strength and flexural strength of the specimens were tested with reference to GB / T 176771-1999 "Test Method for Strength of Cement Mortar" (ISO method).

[0146] The thermal conductivity of the specimens was tested with reference to GB / T 20473-2021 "Building Thermal Insulation Mortar". With reference to GB / T19889.6-2005 and GB 50121-2005, the normalized impact sound pressure level of the specimens was tested to evaluate the sound insulation effect of the specimens.

[0147] The test results are shown in Table 2.

[0148] Table 2

[0149]

[0150] It can be seen from the test results in Table 2 that, compared with the application examples, in application comparative examples 8-15, since the necessary technical solutions were not adopted, their performance in corresponding performance tests was significantly worse than that of the application examples. Specifically, in application comparative example 8, the surface activity of the unmodified fiber was poor, and the bonding force with the matrix was weak, resulting in a decrease in strength; moreover, the dispersion of the unmodified fiber was poor, the damping effect was weakened, the sound insulation effect was reduced, the interface defects increased, the pore structure was incomplete, and the thermal conductivity increased. In application comparative example 9, without adding basalt fibers, the compressive support effect of the mortar was weakened, and the stiffness of the fiber system decreased, and the sound wave transmission increased slightly, thus affecting the sound insulation performance of the mortar. In application comparative example 10, without adding aramid fibers, the toughness of the material decreased, and the damping effect of the fibers was weakened, and the sound insulation performance of the mortar was reduced. In addition, without adding aramid fibers, the denseness of the fiber network decreased, and the heat conduction path increased, thus reducing the heat insulation performance of the mortar. In application comparative example 11, without adding cellulose nanofibers, the interface strengthening effect of cellulose nanofibers disappeared, and the bonding force with the matrix decreased, resulting in a loose microstructure, reduced sound wave reflection, and poor sound insulation of the mortar. In application comparative example 12, without using methanesulfonic acid treatment, the chemical modification of the fiber surface was lacking, resulting in insufficient bonding between the fiber and the matrix, a decrease in the mechanical properties of the mortar, and a reduction in sound energy absorption. Moreover, the interfacial microcracks increased, and the heat conduction path increased slightly. In application comparative example 13, without silane coupling agent treatment, the interfacial bonding between the fiber and the matrix was extremely poor, the fiber and the matrix were easily peeled off, the strength of the mortar decreased significantly, and the internal damping of the material decreased significantly; moreover, a large number of interface defects led to an increase in the heat conduction efficiency. In application comparative example 14, using modified waste rubber particles to replace modified fibers, the strength of the mortar decreased significantly, and the rubber elasticity absorbed sound energy, and the sound insulation performance of the mortar increased slightly. In application comparative example 15, without adding functional fillers and only relying on lightweight aggregates, the strength, sound insulation performance, and heat insulation performance of the mortar decreased significantly.

[0151] In this article, specific examples are used to elaborate on the principles and implementation modes of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention, including the best mode, and also enables any person skilled in the art to practice the present invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that for those of ordinary skill in the art in the technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention. The protection scope of the present invention patent is defined by the claims and may include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements similar to the literal description of the claims, or if they include equivalent structural elements that have no substantial difference from the literal description of the claims, then these other embodiments should also be included within the scope of the claims.

Claims

1. A sound-insulating and heat-insulating building mortar, characterized in that: By weight, it includes 42 - 48 parts of cementitious materials, 15 - 25 parts of auxiliary materials, 17 - 22 parts of lightweight aggregates, 30 - 35 parts of functional fillers, and 1 - 2 parts of admixtures; the cementitious materials are a mixture of sulfoaluminate cement and Portland cement; the auxiliary materials are a mixture of fly ash and quartz sand, the lightweight aggregates are a mixture of hollow vitrified microspheres with a mesh size of 20 - 40 and hollow vitrified microspheres with a mesh size of 70 - 90, and the mass ratio of the two is 1:(2 - 3); the functional fillers are a mixture of modified waste rubber particles and modified fibers; the admixtures are a mixture of polycarboxylate superplasticizer and hydroxypropyl methyl cellulose ether.

2. The sound-insulating and heat-insulating building mortar according to claim 1, characterized in that: The mass ratio of sulfoaluminate cement to Portland cement is (12 - 15):(30 - 33); the mass ratio of fly ash to quartz sand is (5 - 10):(10 - 15); the mass ratio of polycarboxylate superplasticizer to hydroxypropyl methyl cellulose ether is (0.2 - 0.3):(0.3 - 0.5); the mass ratio of the modified waste rubber particles to the modified fibers is (19 - 26):(3 - 5), and the fibers are a mixture of basalt fiber, aramid fiber, and cellulose nanofiber, and the mass ratio of basalt fiber, aramid fiber, and cellulose nanofiber is 2 - 3:1 - 2:

1.

3. A sound-insulating and heat-insulating building mortar according to claim 1, wherein: The preparation method of the modified waste rubber particles is as follows: The waste rubber particles are soaked in an alkaline solution and then oxidized by an oxidant to obtain activated rubber particles; The activated rubber particles are subjected to a primary modification treatment in a tannic acid solution to obtain primary modified rubber particles; Ethyl orthosilicate, ethanol, and deionized water are mixed, hydrochloric acid is added to adjust the pH to 2 - 3, and stirring is carried out for pre-hydrolysis treatment to obtain a pre-hydrolyzed sol. Then polyethylene glycol and silane coupling agent KH792 are added, stirring is continued, primary modified rubber particles are added, and a water bath reaction is carried out. After the reaction ends, centrifugation is carried out, and after the centrifugal precipitate is washed, it is dried to obtain modified waste rubber particles.

4. The sound-insulating and heat-insulating building mortar according to claim 3, wherein: The alkaline solution is a sodium hydroxide solution with a concentration of 5wt%, the temperature of the soaking treatment is 60 - 70°C, the time is 2 - 6h, and the solid-liquid ratio is 1:(5 - 10); the oxidant is a hydrogen peroxide solution with a concentration of 3 - 10wt%, and a sulfuric acid solution is added to adjust its pH to 3 - 5. The solid-liquid ratio during oxidation is 1:(5 - 10), and it is treated at 50 - 80°C for 1 - 3h.

5. The sound-insulating and heat-insulating building mortar according to claim 3, characterized in that: The concentration of the tannic acid solution is 1 - 5wt%; the pH of the primary modification treatment is 3 - 5, the temperature is 50 - 70°C, and the time is 4 - 6h.

6. The sound-insulating and heat-insulating building mortar according to claim 3, characterized in that: The volume ratio of ethyl orthosilicate, ethanol, and deionized water is 1:(4 - 5):(1 - 2), the temperature of the pre-hydrolysis treatment is room temperature, and the time is 30 - 60min; the polyethylene glycol is polyethylene glycol 2000 - 6000, and the mass ratio of polyethylene glycol to ethyl orthosilicate is 1:(1 - 2); the addition amount of the silane coupling agent KH792 is 1 - 5wt% of the mass of the pre-hydrolyzed sol, and the addition amount of the primary modified rubber particles to the mass of the pre-hydrolyzed sol is 1:(20 - 25); the temperature of the water bath reaction is 40°C, and the time is 6 - 8h.

7. The sound-insulating and heat-insulating building mortar according to claim 1, characterized in that: The preparation method of the modified fibers is as follows: Mix aramid fiber, potassium hydroxide, deionized water and DMSO, stir at room temperature to obtain a pretreatment solution, slowly add deionized water for dilution treatment, and finally wash with deionized water to obtain an aramid fiber dispersion with a concentration of 4-5 wt%; Mix and stir the aramid fiber dispersion, the cellulose nanofiber dispersion and basalt fiber to obtain a mixed fiber dispersion. Add an aminomethanesulfonic acid solution to the mixed fiber dispersion, mix and then carry out a hydrothermal reaction. After washing and drying the modified fiber, add it to the hydrolysis solution of the silane coupling agent for cross-linking reaction. After the reaction is completed, centrifuge, wash the centrifuged precipitate and dry it to obtain the modified fiber.

8. A sound-insulating and heat-insulating building mortar according to claim 7, characterized in that: The dosage ratio of the aramid fiber, potassium hydroxide, deionized water, and DMSO is 1 g:(1-2) g:20 ml:500 ml; the stirring time at room temperature is 3-4 h, and the stirring speed is 500-800 revolutions per minute; when diluting, the dropping speed of deionized water is 40-50 ml / h, the added amount of deionized water is 1-2 times the volume of the pretreatment solution, and continue to stir at room temperature for 1-1.5 h after the dropping of deionized water ends.

9. The sound-insulating and heat-insulating building mortar according to claim 7, wherein: The aminomethanesulfonic acid solution is prepared by mixing aminomethanesulfonic acid and sodium hydroxide solution, and the molar ratio of aminomethanesulfonic acid to sodium hydroxide is 1:(1.2-1.3); the mass ratio of aminomethanesulfonic acid to the mixed fiber is 1:(2-3); the temperature of the hydrothermal reaction is 120 °C, and the time of the hydrothermal reaction is 15-20 h; The preparation of the hydrolysis solution of the silane coupling agent is as follows: dissolve the silane coupling agent in an ethanol solution, adjust the pH of the solution to 4-5, and stir and hydrolyze at room temperature for 30-60 min to obtain it. The silane coupling agent is silane coupling agent KH550, the added amount of silane coupling agent KH550 is 1-5 wt% of the mass of the mixed fiber, the temperature of the cross-linking reaction is 50-70 °C, and the time is 1-2 h.

10. The preparation method of a sound-insulating and heat-insulating building mortar according to any one of claims 1-9, characterized in that, It includes the following steps: According to the metering ratio, add sulfoaluminate cement and portland cement to a mixer, stir and mix for 4-5 min, then add hollow vitrified microspheres with a particle size of 20-40 mesh, hollow vitrified microspheres with a particle size of 70-90 mesh, modified waste rubber particles, modified fiber, fly ash, and quartz sand, continue to stir for 8-10 min, and finally add polycarboxylate water reducer and hydroxypropyl methyl cellulose ether, stir and mix for 20-30 min to obtain it.

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