Impermeable material based on building residue soil and preparation method thereof

Abstract

The invention discloses an impermeable material based on building residue soil and a preparation method thereof, and relates to the technical field of impermeable material preparation, the impermeable material comprises the following materials: building residue soil, cement, a modified polymer emulsion, an active waterproof agent, polypropylene fiber, silica fume, isobutyltriethoxysilane and water; insoluble crystals are generated by adding the active waterproof agent, capillary pores and microcracks can be efficiently blocked, and the durability and reliability of the concrete are greatly improved; by adding the modified polymer emulsion, the dry shrinkage stress of the cement-based material can be relieved, the interface bonding force with a cement matrix can be enhanced, capillary water channels in the material can be blocked, the permeability coefficient is reduced, meanwhile, the interface bonding strength is improved, and stripping of an impermeable layer and a subgrade base layer is avoided; in addition, the isobutyltriethoxysilane can also have a synergistic effect with the active waterproof agent, so that the problem of permeation under water pressure can be solved, the hidden danger of capillary water absorption can also be eliminated, and the durability and reliability of the anti-seepage material are greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of impermeable material preparation, in particular to an impermeable material based on construction waste and a preparation method thereof. BACKGROUND

[0002] The impermeable material is a kind of functional building material for preventing liquid or gas from permeating, which plays a role in moisture-proof, impermeable, waterproof and protection in building engineering, water conservancy engineering and environmental protection engineering.

[0003] The impermeable material for roadbed cushion layer needs to adapt to roadbed bearing, base deformation and underground environment, and its defects show obvious scene correlation: the core problem is that the material performance is not suitable for the working condition of the cushion layer, such as the high molecular geotechnical membrane, although it has good impermeability, but the anti-rolling and anti-shearing capacity is weak, and it is easy to produce local damage under the vehicle dynamic load and the extrusion of the base gravel, and the impermeable material is easy to cause local insufficient expansion or excessive expansion, resulting in structural deformation and weakening the impermeable continuity; the coupling of environment and load accelerates the development of defects, and the seepage pressure of underground water gradually expands the small pores of the material, forming a piping hazard, and the freeze-thaw cycle causes the internal water of the material to repeatedly freeze and thaw, which causes micro-cracks and continuous expansion.

[0004] Therefore, the present application provides an impermeable material based on construction waste and a preparation method thereof to solve the above problems. SUMMARY

[0005] The main purpose of the present application is to provide a preparation method of impermeable material with low permeability coefficient, high tensile strength and high water absorption rate, which is applied to the preparation of impermeable material.

[0006] To achieve the above purpose, the technical scheme adopted by the present application is as follows: a preparation method of an impermeable material based on construction waste, the preparation of the impermeable material comprising the following steps: S1. using a vibrating screen to screen the construction waste to obtain large particle construction waste, medium particle construction waste and small particle construction waste, using a fiber dispersing machine to disperse polypropylene fibers at a speed of 30000 rpm for 5-10 minutes to obtain dispersed fibers; S2. adding the large particle construction waste, the medium particle construction waste, the small particle construction waste, the portland cement, the active waterproof agent and the silica ash into a forced mixer and stirring at a speed of 900-1200 rpm for 1-2 minutes, and then adding the dispersed fibers and stirring at a speed of 900-1200 rpm for 1-2 minutes to obtain a mixed dry material; S3. Add water accounting for 70-80% of the total mass of water into the reaction kettle and stir at a speed of 300-400 rpm, add isobutyl triethoxysilane and stir at a speed of 600-800 rpm, stir for 2-3 minutes, add the modified polymer emulsion and stir at a speed of 100-150 rpm for 1-2 minutes to obtain a mixed wet material; S4. Add the mixed dry material into the reaction kettle and stir at a speed of 900-1200 rpm, add the mixed wet material and stir at a speed of 1800-2400 rpm for 3-5 minutes to obtain the anti-seepage material.

[0007] The construction waste does not contain impurities such as wood, plastic and metal.

[0008] Further, the large particle construction waste has a particle size of 4.75-10 mm, the medium particle construction waste has a particle size of 0.6-4.75 mm, and the small particle construction waste has a particle size of <0.6 mm. The mass ratio of the large particle construction waste, the medium particle construction waste and the small particle construction waste in S1 is 3-5:3-5:2-3.

[0009] Further, the polypropylene fiber has a length of 12-19 mm.

[0010] After the penetration of the isobutyl triethoxysilane, the pore wall changes from hydrophilic to permanent hydrophobic, effectively preventing water from being absorbed by capillary action, thereby forming a protective layer.

[0011] Further, the mass ratio of the construction waste, the portland cement, the modified polymer emulsion, the active waterproof agent, the polypropylene fiber, the silica fume, the isobutyl triethoxysilane and water is 7-9:1:0.15-0.25:0.02-0.04:0.005-0.015:0.1-0.2:0.003-0.008:0.3-0.45.

[0012] Further, the modified polymer emulsion comprises the following raw materials in parts by weight: 40-60 parts of butyl acrylate, 30-50 parts of methyl methacrylate, 5-15 parts of 4-hydroxybutyl acrylate, 5-15 parts of hydroxyethyl acrylate, 1-3 parts of acrylic acid, 0.5-1.5 parts of ammonium persulfate, 60-80 parts of deionized water and 2-5 parts of emulsifier.

[0013] 4-hydroxybutyl acrylate contains long-chain alkyl structure, which can give high elasticity to the emulsion after film formation, relieve the drying shrinkage stress of cement-based materials, reduce the drying shrinkage force of cement-based materials, and effectively inhibit the generation of micro-cracks under the action of temperature change or load; the hydroxyl groups in the hydroxyethyl acrylate molecule can form chemical bonds with Ca²⁺ and OH⁻ in the cement hydration product, thereby enhancing the interfacial adhesion between the emulsion and the cement matrix; the continuous polymer film formed by the combination of the two can block the capillary water channels inside the material, reduce the permeability coefficient, and at the same time, improve the interfacial adhesion strength to avoid the peeling of the impermeable layer from the roadbed base.

[0014] Further, the preparation of the modified polymer emulsion comprises the following steps: Step 1. Add 80-85% of deionized water to the reaction kettle and stir at a speed of 400-600 rpm, add the emulsifier and stir for 5-10 minutes to prepare the emulsifier emulsion; Step 2. Add butyl acrylate, methyl methacrylate, 4-hydroxybutyl acrylate, hydroxyethyl acrylate and acrylic acid to a new reaction kettle and stir at a speed of 30-60 rpm for 1-2 minutes to prepare a mixed emulsion; Step 3. Add the emulsifier emulsion to a high-speed disperser and disperse at a speed of 1500-2500 rpm, then add the mixed emulsion to the high-speed disperser to prepare a pretreated emulsion; Step 4. Add the remaining deionized water to the reaction kettle and control the temperature at 2-8°C, then add ammonium persulfate and stir to prepare an initiator solution; Step 5. Add 5-15% of the pretreated emulsion to the total mass of the pretreated emulsion and 10-20% of the initiator solution to the total mass of the initiator solution to the reaction kettle and stir at a speed of 10-35 rpm, control the temperature at 75-80°C, and stir for 10-20 minutes; then simultaneously add the remaining pretreated emulsion and the remaining initiator solution to the reaction kettle and stir at a speed of 10-35 rpm, heat the temperature to 85-95°C, and maintain the temperature for 40-60 minutes; then naturally cool the temperature to below 40°C, add ammonia water to adjust the pH value to 7-8, filter the residue using 50-150 mesh gauze, and prepare the modified polymer emulsion.

[0015] Further, the emulsifier is a mixture of sodium dodecyl sulfate and polyoxyethylene octyl phenol ether-10; The mass ratio of sodium dodecyl sulfate and polyoxyethylene octyl phenol ether-10 is 1:2; The concentration of the ammonia water is 5-10%.

[0016] Further, the active waterproofing agent comprises the following raw materials by weight: 10-20 parts of diethylenetriamine pentaacetic acid, 5-15 parts of ethylenediamine tetraacetic acid, 30-50 parts of Portland cement, 25-40 parts of quartz sand, and 3-8 parts of polycarboxylate superplasticizer.

[0017] The polycarboxylate superplasticizer comprises one or more of methacrylate copolymer and propylene ether copolymer.

[0018] The diethylenetriamine pentaacetic acid has stronger chelating ability and can form a more stable crystal network, and the ethylenediamine tetraacetic acid has rapid reaction and good permeability, and the two can be compounded to widen the range of action, generate more dense and deeper penetrating insoluble crystals, not only can effectively plug capillary pores and microcracks, but also can be activated when water molecules invade again, continuously heal new micro-damage, thereby endowing the impermeable material with excellent long-term waterproofing performance and self-repairing ability, greatly improving the durability and reliability.

[0019] Further, the preparation of the active waterproofing agent comprises the following steps: sieving diethylenetriamine pentaacetic acid and ethylenediamine tetraacetic acid through a 100-150 mesh sieve respectively to obtain diethylenetriamine pentaacetic acid powder and ethylenediamine tetraacetic acid powder, adding Portland cement and quartz sand into a dry powder mixer and stirring at a speed of 10-20 rpm for 10-15 minutes, adding the diethylenetriamine pentaacetic acid powder and the ethylenediamine tetraacetic acid powder and stirring, adjusting the speed to 30-60 rpm and stirring for 30-45 minutes, adding polycarboxylate superplasticizer and stirring for 10-15 minutes, and obtaining the active waterproofing agent.

[0020] In the second aspect, the application further provides a building waste-based impermeable material prepared by the preparation method of the impermeable material.

[0021] The application has the following beneficial effects: 1. In the application, the advantage of adding the active waterproofing agent lies in the synergistic "active defense" mechanism. The diethylenetriamine pentaacetic acid has stronger chelating ability and can form a more stable crystal network, and the ethylenediamine tetraacetic acid has rapid reaction and good permeability, and the two can be compounded to widen the range of action, generate more dense and deeper penetrating insoluble crystals, not only can effectively plug capillary pores and microcracks, but also can be activated when water molecules invade again, continuously heal new micro-damage, thereby endowing the impermeable material with excellent long-term waterproofing performance and self-repairing ability, greatly improving the durability and reliability.

[0022] 2. In the present application, the addition of modified polymer emulsion is the key component to improve the flexibility and impermeability of the material, in which the long-chain alkyl structure of 4-hydroxybutyl acrylate can give the emulsion high elasticity after film formation, relieve the drying shrinkage stress of cement-based materials, reduce the drying shrinkage force of cement-based materials, and effectively inhibit the generation of micro-cracks under temperature changes or load action; the hydroxyl groups in the hydroxyethyl acrylate molecule can form chemical bonds with Ca2+, OH- in the cement hydration products, enhancing the interfacial adhesion between the emulsion and the cement matrix; the continuous polymer film formed by the combination of the two can block the internal capillary water channels of the material, reduce the permeability coefficient, and at the same time improve the interfacial adhesion strength, avoiding the peeling of the impermeable layer from the roadbed base.

[0023] 3. In the present application, the addition of isobutyl triethoxysilane and active waterproofing agent can have a synergistic effect. The diethylene triamine pentaacetic acid and ethylene diamine tetraacetic acid in the active waterproofing agent act as strong chelating agents, which can actively penetrate into the interior of the concrete, catalyze the generation of water-insoluble crystals, permanently block capillary pores and micro-cracks, and form a "rigid skeleton" with self-repairing ability; while the isobutyl triethoxysilane makes the pore wall change from hydrophilic to permanent hydrophobic after the penetration of small molecules, effectively preventing water from being absorbed by capillary action, forming a "flexible protective layer". The combination of the two not only solves the problem of permeability under water pressure, but also eliminates the hidden danger of capillary water absorption, thereby greatly improving the durability and reliability of the impermeable material. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0025] It should be noted that the raw materials used in the following experiments are all commercially available.

[0026] Example 1, a preparation method of a impermeable material based on construction waste, the preparation of the impermeable material comprises the following steps: S1. Screen the construction waste using a vibrating screen to obtain large-particle waste, medium-particle waste, and small-particle waste, and use a fiber dispersing machine to disperse polypropylene fibers at a speed of 30000 rpm for 5-10 minutes to obtain dispersed fibers; S2. Add the large-particle waste, medium-particle waste, small-particle waste, Portland cement, active waterproofing agent, and silica fume to a forced mixer and stir at a speed of 900-1200 rpm for 1-2 minutes, then add the dispersed fibers and stir at a speed of 900-1200 rpm for 1-2 minutes to obtain a mixed dry material; S3. Add water accounting for 70-80% of the total mass of water to the reaction kettle and stir at a speed of 300-400 rpm, add isobutyl triethoxysilane and stir at a speed of 600-800 rpm, stir for 2-3 minutes, add the modified polymer emulsion and stir at a speed of 100-150 rpm, stir for 1-2 minutes, and prepare the mixed wet material; S4. Add the mixed dry material to the reaction kettle and stir at a speed of 900-1200 rpm, add the mixed wet material and stir at a speed of 1800-2400 rpm, and stir for 3-5 minutes to prepare the anti-permeation material.

[0027] The large particle slag has a particle size of 4.75-10 mm, the medium particle slag has a particle size of 0.6-4.75 mm, and the small particle slag has a particle size of <0.6 mm. The mass ratio of the large particle slag, the medium particle slag, and the small particle slag in S1 is 3-5:3-5:2-3.

[0028] The polypropylene fiber has a length of 12-19 mm.

[0029] The mass ratio of the construction slag, the portland cement, the modified polymer emulsion, the active waterproofing agent, the polypropylene fiber, the silica ash, the isobutyl triethoxysilane, and the water is 7:1:0.15:0.02:0.005:0.1:0.003:0.3.

[0030] The modified polymer emulsion comprises the following raw materials in parts by weight: 40-60 parts of butyl acrylate, 30-50 parts of methyl methacrylate, 5-15 parts of 4-hydroxybutyl acrylate, 5-15 parts of hydroxyethyl acrylate, 1-3 parts of acrylic acid, 0.5-1.5 parts of ammonium persulfate, 60-80 parts of deionized water, and 2-5 parts of an emulsifier.

[0031] The preparation of the modified polymer emulsion comprises the following steps: Step 1. Add deionized water accounting for 80-85% of the total mass of deionized water to the reaction kettle and stir at a speed of 400-600 rpm, add the emulsifier and stir for 5-10 minutes to prepare the emulsifier emulsion; Step 2. Add butyl acrylate, methyl methacrylate, 4-hydroxybutyl acrylate, hydroxyethyl acrylate, and acrylic acid to a new reaction kettle and stir at a speed of 30-60 rpm for 1-2 minutes to prepare the mixed emulsion; Step 3. Add the emulsifier emulsion to a high-speed disperser and disperse at a speed of 1500-2500 rpm, and then add the mixed emulsion to the high-speed disperser to prepare the pretreated emulsion; Step 4. Add the remaining deionized water to the reaction kettle and control the temperature at 2-8°C, and then add ammonium persulfate and stir to prepare the initiator solution; Step 5. Add 5-15% of the pretreated emulsion and 10-20% of the initiator solution to the reaction kettle and stir at a speed of 10-35 rpm, control the temperature at 75-80℃, stir for 10-20 minutes, then add the remaining pretreated emulsion and the remaining initiator solution to the reaction kettle simultaneously, drop at a speed of 10-35 rpm for 3-4 hours, heat the temperature to 85-95℃, keep for 40-60 minutes, cool the temperature to below 40℃, add ammonia to adjust the pH value to 7-8, filter out the residue with 50-150 mesh gauze, and obtain the modified polymer emulsion.

[0032] The emulsifier is a mixture of sodium dodecyl sulfate and polyoxyethylene octyl phenol ether-10; The mass ratio of sodium dodecyl sulfate and polyoxyethylene octyl phenol ether-10 is 1:2; The concentration of the ammonia is 5-10%.

[0033] The active waterproofing agent comprises the following raw materials by weight: 10-20 parts of diethylene triamine pentaacetic acid, 5-15 parts of ethylenediamine tetraacetic acid, 30-50 parts of Portland cement, 25-40 parts of quartz sand, and 3-8 parts of polycarboxylate superplasticizer.

[0034] The preparation of the active waterproofing agent comprises the following steps: sieving diethylene triamine pentaacetic acid and ethylenediamine tetraacetic acid through a 100-150 mesh sieve to obtain diethylene triamine pentaacetic acid powder and ethylenediamine tetraacetic acid powder, adding Portland cement and quartz sand to a dry powder mixer and stirring at a speed of 10-20 rpm for 10-15 minutes, adding diethylene triamine pentaacetic acid powder and ethylenediamine tetraacetic acid powder and stirring, adjusting the stirring speed to 30-60 rpm, stirring for 30-45 minutes, adding polycarboxylate superplasticizer and stirring for 10-15 minutes, and obtaining the active waterproofing agent.

[0035] Example 2, a preparation method of a building slag-based impermeable material, the preparation of the impermeable material comprises the following steps: S1. Sieving the building slag using a vibrating screen to obtain large particle slag, medium particle slag, and small particle slag, and dispersing polypropylene fibers using a fiber dispersing machine at a speed of 30000 rpm for 5-10 minutes to obtain dispersed fibers. S2. Adding the large particle slag, the medium particle slag, the small particle slag, Portland cement, the active waterproofing agent, and silica fume to a forced mixer and stirring at a speed of 900-1200 rpm for 1-2 minutes, adding the dispersed fibers and stirring at a speed of 900-1200 rpm for 1-2 minutes, and obtaining the mixed dry materials. S3. Add water accounting for 70-80% of the total mass of water into the reaction kettle and stir at a speed of 300-400 rpm, add isobutyl triethoxysilane and stir at a speed of 600-800 rpm, stir for 2-3 minutes, add the modified polymer emulsion and stir at a speed of 100-150 rpm, stir for 1-2 minutes, and prepare the mixed wet material; S4. Add the mixed dry material into the reaction kettle and stir at a speed of 900-1200 rpm, add the mixed wet material and stir at a speed of 1800-2400 rpm, stir for 3-5 minutes, and prepare the anti-permeation material.

[0036] The particle size of the large particle slag is 4.75-10 mm, the particle size of the medium particle slag is 0.6-4.75 mm, and the particle size of the small particle slag is <0.6 mm. The mass ratio of the large particle slag, the medium particle slag and the small particle slag in S1 is 3-5:3-5:2-3.

[0037] The length of the polypropylene fiber is 12-19 mm.

[0038] The mass ratio of the construction slag, the portland cement, the modified polymer emulsion, the active waterproof agent, the polypropylene fiber, the silica ash, the isobutyl triethoxysilane and the water is 8:1:0.2:0.03:0.01:0.15:0.005:0.4.

[0039] The modified polymer emulsion comprises the following raw materials in parts by weight: 40-60 parts of butyl acrylate, 30-50 parts of methyl methacrylate, 5-15 parts of 4-hydroxybutyl acrylate, 5-15 parts of hydroxyethyl acrylate, 1-3 parts of acrylic acid, 0.5-1.5 parts of ammonium persulfate, 60-80 parts of deionized water and 2-5 parts of emulsifier.

[0040] The preparation of the modified polymer emulsion comprises the following steps: Step 1. Add deionized water accounting for 80-85% of the total mass of deionized water into the reaction kettle and stir at a speed of 400-600 rpm, add the emulsifier and stir for 5-10 minutes, and prepare the emulsifier emulsion; Step 2. Add butyl acrylate, methyl methacrylate, 4-hydroxybutyl acrylate, hydroxyethyl acrylate and acrylic acid into a new reaction kettle and stir at a speed of 30-60 rpm, stir for 1-2 minutes, and prepare the mixed emulsion; Step 3. Add the emulsifier emulsion into the high-speed dispersion machine and disperse at a speed of 1500-2500 rpm, add the mixed emulsion into the high-speed dispersion machine, and prepare the pretreated emulsion; Step 4. Add the remaining deionized water into the reaction kettle, control the temperature at 2-8℃, add ammonium persulfate and stir, and prepare the initiator solution; Step 5. Add 5-15% of the pretreated emulsion and 10-20% of the initiator solution to the reaction kettle and stir at a speed of 10-35 rpm, control the temperature at 75-80℃, stir for 10-20 minutes, then add the remaining pretreated emulsion and the remaining initiator solution to the reaction kettle simultaneously, drop at a speed of 10-35 rpm for 3-4 hours, heat the temperature to 85-95℃, keep for 40-60 minutes, cool the temperature to below 40℃, add ammonia to adjust the pH value to 7-8, filter out the residue with 50-150 mesh gauze, and obtain the modified polymer emulsion.

[0041] The emulsifier is a mixture of sodium dodecyl sulfate and polyoxyethylene octyl phenol ether-10; The mass ratio of sodium dodecyl sulfate and polyoxyethylene octyl phenol ether-10 is 1:2; The concentration of the ammonia is 5-10%.

[0042] The active waterproofing agent comprises the following raw materials by weight: 10-20 parts of diethylene triamine pentaacetic acid, 5-15 parts of ethylenediamine tetraacetic acid, 30-50 parts of Portland cement, 25-40 parts of quartz sand, and 3-8 parts of polycarboxylate superplasticizer.

[0043] The preparation of the active waterproofing agent comprises the following steps: sieving diethylene triamine pentaacetic acid and ethylenediamine tetraacetic acid through a 100-150 mesh sieve to obtain diethylene triamine pentaacetic acid powder and ethylenediamine tetraacetic acid powder, adding Portland cement and quartz sand to a dry powder mixer and stirring at a speed of 10-20 rpm for 10-15 minutes, adding diethylene triamine pentaacetic acid powder and ethylenediamine tetraacetic acid powder and stirring, adjusting the stirring speed to 30-60 rpm, and stirring for 30-45 minutes, adding polycarboxylate superplasticizer and stirring for 10-15 minutes to obtain the active waterproofing agent.

[0044] Example 3, a preparation method of a building slag-based impermeable material, the preparation of the impermeable material comprises the following steps: S1. Sieving the building slag using a vibrating screen to obtain large particle slag, medium particle slag, and small particle slag, and dispersing polypropylene fibers using a fiber dispersing machine at a speed of 30000 rpm for 5-10 minutes to obtain dispersed fibers; S2. Adding the large particle slag, the medium particle slag, the small particle slag, Portland cement, the active waterproofing agent, and silica fume to a forced mixer and stirring at a speed of 900-1200 rpm for 1-2 minutes, adding the dispersed fibers and stirring at a speed of 900-1200 rpm for 1-2 minutes to obtain mixed dry materials; S3. Add water accounting for 70-80% of the total mass of water into the reaction kettle and stir at a speed of 300-400 rpm, add isobutyl triethoxysilane and stir at a speed of 600-800 rpm, stir for 2-3 minutes, add the modified polymer emulsion and stir at a speed of 100-150 rpm, stir for 1-2 minutes, and prepare the mixed wet material; S4. Add the mixed dry material into the reaction kettle and stir at a speed of 900-1200 rpm, add the mixed wet material and stir at a speed of 1800-2400 rpm, stir for 3-5 minutes, and prepare the anti-permeation material.

[0045] The large particle slag has a particle size of 4.75-10 mm, the medium particle slag has a particle size of 0.6-4.75 mm, and the small particle slag has a particle size of <0.6 mm. The mass ratio of the large particle slag, the medium particle slag and the small particle slag in S1 is 3-5:3-5:2-3.

[0046] The polypropylene fiber has a length of 12-19 mm.

[0047] The mass ratio of the construction slag, the portland cement, the modified polymer emulsion, the active waterproofing agent, the polypropylene fiber, the silica ash, the isobutyl triethoxysilane and the water is 9:1:0.25:0.04:0.015:0.2:0.008:0.45.

[0048] The modified polymer emulsion comprises the following raw materials in parts by weight: 40-60 parts of butyl acrylate, 30-50 parts of methyl methacrylate, 5-15 parts of 4-hydroxybutyl acrylate, 5-15 parts of hydroxyethyl acrylate, 1-3 parts of acrylic acid, 0.5-1.5 parts of ammonium persulfate, 60-80 parts of deionized water and 2-5 parts of emulsifier.

[0049] The preparation of the modified polymer emulsion comprises the following steps: Step 1. Add deionized water accounting for 80-85% of the total mass of deionized water into the reaction kettle and stir at a speed of 400-600 rpm, add the emulsifier and stir for 5-10 minutes, and prepare the emulsifier emulsion; Step 2. Add butyl acrylate, methyl methacrylate, 4-hydroxybutyl acrylate, hydroxyethyl acrylate and acrylic acid into a new reaction kettle and stir at a speed of 30-60 rpm, stir for 1-2 minutes, and prepare the mixed emulsion; Step 3. Add the emulsifier emulsion into the high-speed dispersion machine and disperse at a speed of 1500-2500 rpm, add the mixed emulsion into the high-speed dispersion machine, and prepare the pretreated emulsion; Step 4. Add the remaining deionized water into the reaction kettle, control the temperature at 2-8℃, add ammonium persulfate and stir, and prepare the initiator solution; Step 5. Add 5-15% of the pretreated emulsion and 10-20% of the initiator solution to the reaction kettle and stir at a speed of 10-35 rpm, control the temperature at 75-80°C, stir for 10-20 minutes, then add the remaining pretreated emulsion and the remaining initiator solution to the reaction kettle simultaneously, drop at a speed of 10-35 rpm for 3-4 hours, heat the temperature to 85-95°C, keep the temperature for 40-60 minutes, cool the temperature to below 40°C, add ammonia to adjust the pH value to 7-8, filter out the residue using 50-150 mesh gauze, and prepare the modified polymer emulsion.

[0050] The emulsifier is a mixture of sodium dodecyl sulfate and polyoxyethylene octyl phenol ether-10; The mass ratio of sodium dodecyl sulfate and polyoxyethylene octyl phenol ether-10 is 1:2; The concentration of the ammonia is 5-10%.

[0051] The active waterproofing agent includes the following raw materials by weight: 10-20 parts of diethylene triamine pentaacetic acid, 5-15 parts of ethylenediamine tetraacetic acid, 30-50 parts of Portland cement, 25-40 parts of quartz sand, and 3-8 parts of polycarboxylate superplasticizer.

[0052] The preparation of the active waterproofing agent includes the following steps: sieve the diethylene triamine pentaacetic acid and the ethylenediamine tetraacetic acid through a 100-150 mesh sieve to obtain diethylene triamine pentaacetic acid powder and ethylenediamine tetraacetic acid powder, add the Portland cement and the quartz sand to a dry powder mixer and stir at a speed of 10-20 rpm for 10-15 minutes, add the diethylene triamine pentaacetic acid powder and the ethylenediamine tetraacetic acid powder and stir, adjust the stirring speed to 30-60 rpm, and stir for 30-45 minutes, then add the polycarboxylate superplasticizer and stir for 10-15 minutes to obtain the active waterproofing agent.

[0053] The particle size of the quartz sand is 50-180 mesh.

[0054] Comparative Example 1, which is different from Example 1 in that: The active waterproofing agent is not included in the comparative example.

[0055] Comparative Example 2, which is different from Example 1 in that: The modified polymer emulsion is not included in the comparative example.

[0056] Comparative Example 3, which is different from Example 1 in that: The isobutyl triethoxysilane is not included in the comparative example.

[0057] Performance test: the anti-seepage materials prepared in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, and Comparative Example 3 are tested.

[0058] Performance test: the performance of the building slag-based anti-seepage material prepared by the method provided in examples 1-3 and comparative examples 1-3 is tested respectively, and the test data is recorded in the following table: Permeability coefficient Tensile strength (MPa) Water absorption reduction rate (%) Example 1 1 x 10⁻ 9 cm / s 1.8 67 Example 2 1 x 10⁻ 8 cm / s 1.9 69 Example 3 1 x 10⁻ 8 cm / s 1.7 71 Comparative Example 1 1 x 10⁻ 6 cm / s 1.5 60 Comparative Example 2 1 x 10⁻ 7 cm / s 0.7 61 Comparative Example 3 1 x 10⁻ 7 cm / s 1.3 52 Among them, the anti-seepage coefficients of the anti-seepage materials prepared by example 1, example 2, example 3, comparative example 1, comparative example 2 and comparative example 3 are 1×10⁻ 9 cm / s, 1×10⁻ 8 cm / s, 1×10⁻ 8 cm / s, 1×10⁻ 6 cm / s, 1×10⁻ 7 cm / s and 1×10⁻ 7 cm / s; the tensile strengths of the anti-seepage materials prepared by example 1, example 2, example 3, comparative example 1, comparative example 2 and comparative example 3 are 1.8 MPa, 1.9 MPa, 1.7 MPa, 1.5 MPa, 0.7 MPa and 1.3 MPa respectively; the water absorption reduction rates of the anti-seepage materials prepared by example 1, example 2, example 3, comparative example 1, comparative example 2 and comparative example 3 are 67%, 69%, 71%, 60%, 61% and 52% respectively; it can be seen that the anti-seepage material prepared by the present application not only has a low anti-seepage coefficient, but also has a relatively high tensile strength and a relatively high water absorption reduction rate. Therefore, the building slag-based anti-seepage material and the preparation method thereof provided by the present application have a broader market prospect and are more suitable for promotion.

[0059] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0060] The preferred embodiments of the present application disclosed above are only used to help explain the present application. The preferred embodiments do not describe all the details and limit the present application to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of the present specification. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can well understand and utilize the present application. The present application is limited only by the claims and their full scope and equivalents.

Claims

1. A method for preparing a construction waste-based impermeable material, characterized by, The preparation of the impermeable material comprises the following steps: S1. Screen the construction waste soil using a vibrating screen to obtain large-particle waste soil, medium-particle waste soil, and small-particle waste soil, and disperse polypropylene fibers using a fiber dispersing machine at a speed of 30,000 rpm for 5-10 minutes to obtain dispersed fibers; S2. Add the large-particle waste soil, the medium-particle waste soil, the small-particle waste soil, Portland cement, active waterproofing agent, and silica fume to a forced mixer and stir at a speed of 900-1,200 rpm for 1-2 minutes, then add the dispersed fibers and stir at a speed of 900-1,200 rpm for 1-2 minutes to obtain mixed dry materials; S3. Add water accounting for 70-80% of the total mass of water to a reaction kettle and stir at a speed of 300-400 rpm, then add isobutyl triethoxysilane and stir at a speed of 600-800 rpm for 2-3 minutes, then add modified polymer emulsion and stir at a speed of 100-150 rpm for 1-2 minutes to obtain mixed wet materials; S4. Add the mixed dry materials to the reaction kettle and stir at a speed of 900-1,200 rpm, then add the mixed wet materials and stir at a speed of 1,800-2,400 rpm for 3-5 minutes to obtain the impermeable material.

2. The production method according to claim 1, characterized by, The large-particle waste soil has a particle size of 4.75-10 mm, the medium-particle waste soil has a particle size of 0.6-4.75 mm, and the small-particle waste soil has a particle size of less than 0.6 mm. In S1, the mass ratio of the large-particle waste soil, the medium-particle waste soil, and the small-particle waste soil is 3-5:3-5:2-3.

3. The preparation method according to claim 1, characterized in that, The polypropylene fibers have a length of 12-19 mm.

4. The method of claim 1, wherein, The mass ratio of the construction waste soil, the Portland cement, the modified polymer emulsion, the active waterproofing agent, the polypropylene fibers, the silica fume, the isobutyl triethoxysilane, and the water is 7-9:1:0.15-0.25:0.02-0.04:0.005-0.015:0.1-0.2:0.003-0.008:0.3-0.

45.

5. The preparation method according to claim 1, characterized in that, The modified polymer emulsion comprises the following raw materials in parts by weight: 40-60 parts of butyl acrylate, 30-50 parts of methyl methacrylate, 5-15 parts of 4-hydroxybutyl acrylate, 5-15 parts of hydroxyethyl acrylate, 1-3 parts of acrylic acid, 0.5-1.5 parts of ammonium persulfate, 60-80 parts of deionized water, and 2-5 parts of emulsifier.

6. The production method according to claim 5, wherein The preparation of the modified polymer emulsion comprises the following steps: Step 1. Add deionized water accounting for 80-85% of the total mass of deionized water to a reaction kettle and stir at a speed of 400-600 rpm, then add the emulsifier and stir for 5-10 minutes to obtain an emulsifier emulsion; Step 2. Add butyl acrylate, methyl methacrylate, 4-hydroxybutyl acrylate, hydroxyethyl acrylate, and acrylic acid to a new reaction kettle and stir at a speed of 30-60 rpm for 1-2 minutes to obtain a mixed emulsion; Step 3. Add the emulsifier emulsion to a high-speed dispersing machine and disperse at a speed of 1,500-2,500 rpm, then add the mixed emulsion to the high-speed dispersing machine to obtain a pretreated emulsion; Step 4. Add the remaining deionized water to a reaction kettle and control the temperature at 2-8℃, then add ammonium persulfate and stir to obtain an initiator solution; Step 5. 5-15% of the pretreated emulsion and 10-20% of the initiator solution are added into the reaction kettle for stirring, the stirring speed is 10-35 rpm, the temperature is controlled at 75-80℃, and the stirring is carried out for 10-20 minutes. The remaining pretreated emulsion and the remaining initiator solution are added into the reaction kettle for stirring at the same time, the dropping time is 3-4 hours, the stirring speed is 10-35 rpm, the temperature is heated to 85-95℃, and the temperature is kept for 40-60 minutes. The temperature is cooled to below 40℃, ammonia is added to adjust the pH value to 7-8, 50-150 mesh gauze is used to filter out the filter residue, and the modified polymer emulsion is prepared.

7. The preparation method according to claim 6, characterized in that, The emulsifier in step 1 is a mixture of sodium dodecyl sulfate and polyoxyethylene octyl phenol ether-10; The mass ratio of sodium dodecyl sulfate and polyoxyethylene octyl phenol ether-10 is 1:

2. The concentration of ammonia in step 5 is 5-10%.

8. The method of claim 1, wherein, The active waterproofing agent comprises the following raw materials by weight: 10-20 parts of diethylene triamine pentaacetic acid, 5-15 parts of ethylenediamine tetraacetic acid, 30-50 parts of Portland cement, 25-40 parts of quartz sand, and 3-8 parts of polycarboxylate superplasticizer.

9. The production method according to claim 8, characterized by, The preparation of the active waterproofing agent comprises the following steps: The diethylene triamine pentaacetic acid and the ethylenediamine tetraacetic acid are respectively sieved through a 100-150 mesh sieve to obtain diethylene triamine pentaacetic acid powder and ethylenediamine tetraacetic acid powder. The Portland cement and the quartz sand are added into a dry powder mixer for stirring at a speed of 10-20 rpm for 10-15 minutes. The diethylene triamine pentaacetic acid powder and the ethylenediamine tetraacetic acid powder are added for stirring, the stirring speed is adjusted to 30-60 rpm, and the stirring is carried out for 30-45 minutes. The polycarboxylate superplasticizer is added for stirring for 10-15 minutes, and the active waterproofing agent is prepared.

10. A construction waste-based anti-seepage material, characterized by, The active waterproofing agent is prepared by the preparation method of the waterproof material according to any one of claims 1-9.