Method for preparing high-strength flow-state solidified soil by utilizing industrial solid waste

Abstract

The invention relates to the technical field of building materials, in particular to a method for preparing high-strength flow-state solidified soil by utilizing industrial solid waste, which comprises the following steps: taking industrial solid waste mixed materials such as steel slag, mineral powder, ardealite, carbide slag and the like as a curing agent, taking redundant soil as raw material soil, taking modified coconut fiber as a reinforcement material, and introducing a composite tackifier to prepare the high-strength flow-state solidified soil. The preparation method comprises the following steps: firstly, epoxidizing coconut shell fibers, and then performing one-pot reaction on the epoxidized coconut shell fibers, branched polyethyleneimine and triglycidyl p-aminophenol to obtain amino-terminated hyperbranched coconut shell fibers serving as modified coconut shell fibers; vinyl-terminated epoxy organic silicon, isopentenol polyoxyethylene ether, N, N-dimethylacrylamide and acrylic acid are used as raw materials to synthesize the composite tackifier, so that the durability of the fluid-state solidified soil is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, and specifically to a method for preparing high-strength fluid-solidified soil using industrial solid waste. Background Art

[0002] Due to its advantages such as stable quality, high fluidity, good self-compacting property, and low cost, fluid-solidified soil is widely used in fields such as silt treatment, karst cave treatment, backfill engineering, and subgrade engineering. Fluid-solidified soil is usually prepared by mixing soil, solidifying agent, water, and admixtures to form a workable mixture, which is then cast and cured to form a geotechnical engineering material with certain strength and stability.

[0003] Currently, cement is mostly used as the solidifying agent for fluid-solidified soil. However, single addition of cement increases the construction cost and carbon emissions. With the development of industry, the discarding and burying of a large amount of industrial solid waste are not conducive to environmental protection. Studying the transformation of common industrial solid wastes such as steel slag, slag, phosphogypsum, and carbide slag into solidifying agents for high-value-added fluid-solidified soil has economic value and practical significance. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for preparing high-strength fluid-solidified soil using industrial solid waste to solve the problems in the prior art.

[0005] To solve the above technical problems, the present invention provides the following technical solutions:

[0006] A method for preparing high-strength fluid-solidified soil using industrial solid waste, comprising the following steps:

[0007] S1: Mix industrial solid waste mixture, redundant soil, and alkali activator to obtain mixed base material A;

[0008] S2: Mix water reducer, modified coconut shell fiber, composite thickener, and water to obtain mixed base material B;

[0009] S3: Mix mixed base material A and mixed base material B, then cast, shape, and cure to prepare high-strength fluid-solidified soil using industrial solid waste mixture.

[0010] Further, the industrial solid waste mixture is obtained by compounding steel slag, mineral powder, carbide slag, and phosphogypsum in a mass ratio of 4:4:1:1, and the particle size of the industrial solid waste mixture is 1 - 2 μm.

[0011] Further, the water reducer is one or more of polycarboxylate water reducer, naphthalene-based water reducer, amino sulfonate water reducer, and sodium lignosulfonate.

[0012] Further, the alkali activator is one or more of sodium silicate, sodium hydroxide, and sodium carbonate.

[0013] Further, the water is one of deionized water, ultrapure water, and tap water.

[0014] Further, the raw material composition of the fluidized solidified soil is: 48 - 62 parts of industrial solid waste mixture, 73 - 93 parts of redundant soil, 1 - 2 parts of alkali activator, 1 - 2 parts of water reducer, 3 - 9 parts of modified coconut shell fiber, 3 - 9 parts of composite thickener, and 50 - 65 parts of water.

[0015] Further, the preparation of the modified coconut shell fiber includes the following steps:

[0016] (1) Mix the coconut shell fiber and sodium hydroxide solution, stir for 1 - 2 h, wash and dry, place in deionized water, keep warm at 18 - 25 °C for 30 - 40 min, add sodium hydroxide solution and epichlorohydrin, stir at 30 - 40 °C for 2 - 3 h, wash and dry to obtain epoxidized coconut shell fiber;

[0017] (2) Mix the epoxidized coconut shell fiber and 1,2 - dichloroethane, perform ultrasonic treatment for 10 - 15 min, add a mixed solution of branched polyethyleneimine and 1,2 - dichloroethane, keep warm in a water bath at 38 - 42 °C for 2 - 3 h, add tris(2,3 - epoxypropyl) - p - aminophenol, continue to keep warm for 2 - 3 h, filter by suction, wash, and dry to obtain the modified coconut shell fiber.

[0018] Further, the mass ratio of epoxidized coconut shell fiber, branched polyethyleneimine, and tris(2,3 - epoxypropyl) - p - aminophenol is 10:6:3.

[0019] Further, the preparation of the composite thickener includes the following steps:

[0020] 1) Mix anhydrous ethanol, deionized water, 3 - [(2,3) - epoxypropoxy]propylmethyldimethoxysilane, and dimethyldimethoxysilane, stir for 8 - 10 min, heat up to 68 - 72 °C, add dibutyltin dilaurate, keep warm for 3 - 4 h, add dimethylethoxyvinylsilane and keep warm for 3 - 4 h, perform rotary evaporation under reduced pressure to obtain vinyl - terminated epoxy organosilicon;

[0021] 2) Under a nitrogen atmosphere, mix deionized water and isopentenol polyoxyethylene ether, sequentially add N,N - dimethylacrylamide and acrylic acid, add a mixed solution of vinyl - terminated epoxy organosilicon and ethanol, adjust the pH value of the solution to 7.1 - 8.1, add a mixed solution of 2,2'-azobis(2 - methylpropionamidine) dihydrochloride and deionized water, keep warm for 3 - 4 h, and cool to obtain the composite thickener.

[0022] Further, the molar ratio of 3 - [(2,3) - epoxypropoxy]propylmethyldimethoxysilane to dimethyldimethoxysilane is 1:2.

[0023] Further, the mass ratio of isoprenol polyoxyethylene ether, N,N-dimethylacrylamide, acrylic acid, and vinyl-terminated epoxy organosilicon is 2.4:9.9:7.2:3.5.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] The present invention provides a method for preparing high-strength fluidized solidified soil using industrial solid waste. Steel slag, mineral powder, phosphogypsum, carbide slag and other industrial solid waste mixtures are used as curing agents, redundant soil is used as raw soil, and modified coconut shell fiber is used as a reinforcing material. A composite thickener is introduced to prepare high-strength fluidized solidified soil, turning waste into treasure, realizing the resource utilization of various industrial solid wastes, realizing the green solidification of soluble phosphorus and heavy metal ions, etc., and having significant engineering and economic value.

[0026] Select steel slag similar to the composition of cement as the main material of the industrial solid waste mixture, and improve the fluidity and compressive strength of the fluidized solidified soil by controlling the ratio and particle size of the industrial solid waste mixture.

[0027] To further improve the mechanical strength of the fluidized solidified soil, coconut shell fiber, which is environmentally friendly, green, easy to obtain, and has excellent mechanical properties, is introduced as a reinforcing material in the fluidized solidified soil. While solving the problem of fiber surplus, it plays a role in strengthening the fluidized solidified soil. To improve the uniformity of the dispersion of coconut shell fiber in the fluidized solidified soil, the coconut shell fiber is modified. First, the coconut shell fiber is epoxidized, and then the epoxidized coconut shell fiber reacts with branched polyethyleneimine and tris(glycidylamino)phenol in one pot to obtain amino-terminated hyperbranched coconut shell fiber as the modified coconut shell fiber, thereby improving the bonding strength between the coconut shell fiber and the fluidized solidified soil and permanently and firmly improving the mechanical strength of the fluidized solidified soil.

[0028] In the present invention, to effectively improve the cohesion and water retention of the fluidized solidified soil, a viscosity regulator is added to the fluidized solidified soil to effectively improve the overall working performance of the fluidized solidified soil. To avoid the adverse effects such as poor compatibility between most existing viscosity regulators such as xanthan gum, cyclodextrin, cellulose ether, polyacrylamide, etc. and common water reducers such as polycarboxylic acid, and easy delamination when directly mixed, in the present invention, vinyl-terminated epoxy organosilicon is first synthesized using 3-[(2,3)-epoxypropoxy]propylmethyldimethoxysilane, dimethyldimethoxysilane, and dimethylethoxyvinylsilane as raw materials, and then a composite thickener is synthesized using vinyl-terminated epoxy organosilicon, isoprenol polyoxyethylene ether, N,N-dimethylacrylamide, and acrylic acid as raw materials by free radical polymerization. It is introduced into the fluidized solidified soil, which not only improves the stability of the fluidized solidified soil, but also significantly increases viscosity, resists segregation, reduces the bleeding rate, and promotes the development of its later strength, thereby greatly improving the durability of the fluidized solidified soil. Detailed implementation mode

[0029] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] It should be noted that if there are directional indications such as up, down, left, right, front, and back in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0031] The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only used to explain the present invention and are not used to limit the present invention.

[0032] Embodiment 1: A method for preparing high-strength fluid-solidified soil using industrial solid waste, comprising the following steps:

[0033] S1: Mix industrial solid waste mixture, redundant soil, and alkali activator to obtain mixed base material A;

[0034] The industrial solid waste mixture is obtained by compounding steel slag, mineral powder, carbide slag, and phosphogypsum in a mass ratio of 4:4:1:1, and the particle size of the industrial solid waste mixture is 1.5 μm;

[0035] The alkali activator is compounded by sodium silicate and sodium hydroxide in a mass ratio of 1:1;

[0036] S2: Mix water reducer, modified coconut shell fiber, composite thickener, and deionized water to obtain mixed base material B;

[0037] The water reducer is polycarboxylate water reducer;

[0038] The preparation of the modified coconut shell fiber includes the following steps:

[0039] (1) Mix 10 g of coconut shell fiber and 350 mL of sodium hydroxide solution with a mass fraction of 18%, stir for 1 h, wash and dry, place in 200 mL of deionized water, keep warm at 18 °C for 40 min, add 80 mL of sodium hydroxide solution with a mass fraction of 30% and 60 mL of epichlorohydrin, stir at 30 °C for 3 h, wash and dry to obtain epoxidized coconut shell fiber;

[0040] (2) Mix 10 g of epoxidized coconut shell fiber and 240 mL of 1,2-dichloroethane, ultrasonically treat for 10 min, add a mixture of 6 g of branched polyethyleneimine and 180 mL of 1,2-dichloroethane, keep warm in a water bath at 38 °C for 3 h, add 3 g of triglycidyl p-aminophenol, continue to keep warm for 2 h, filter, wash, and dry to obtain modified coconut shell fiber;

[0041] The preparation of the composite tackifier includes the following steps:

[0042] 1) Mix 7.5 mL of absolute ethanol, 1 mL of deionized water, 0.5 mmol of 3-[(2,3)-epoxypropoxy]propylmethyldimethoxysilane, and 1 mmol of dimethyldimethoxysilane, stir for 8 min, heat up to 68 °C, add 1 phr of dibutyltin dilaurate, keep warm for 3 h, add 1 mmol of dimethylethoxyvinylsilane and keep warm for 3 h, and perform rotary evaporation under reduced pressure to obtain vinyl-terminated epoxy silicone;

[0043] 2) Under a nitrogen atmosphere, mix 30 mL of deionized water and 2.4 g of isopentenol polyoxyethylene ether, successively add 9.9 g of N,N-dimethylacrylamide and 7.2 g of acrylic acid, add a mixture of 3.5 g of vinyl-terminated epoxy silicone and 30 mL of ethanol, adjust the pH value of the solution to 7.1, add a mixture of 230 mg of 2,2'-azobis(2-methylpropionamidine) dihydrochloride and 1 mL of deionized water, keep warm for 3 h, and cool to obtain the composite tackifier;

[0044] S3: Mix the mixed base material A and the mixed base material B, then pour, mold, and cure to prepare high-strength flowable solidified soil using industrial solid waste mixture;

[0045] By weight, the raw material composition of the flowable solidified soil is: 48 parts of industrial solid waste mixture, 73 parts of redundant soil, 1 part of alkali activator, 1 part of water reducer, 3 parts of modified coconut shell fiber, 3 parts of composite tackifier, and 50 parts of deionized water.

[0046] Example 2: A method for preparing high-strength flowable solidified soil using industrial solid waste, including the following steps:

[0047] S1: Mix the industrial solid waste mixture, redundant soil, and alkali activator to obtain the mixed base material A;

[0048] The industrial solid waste mixture is prepared by compounding steel slag, mineral powder, carbide slag, and phosphogypsum in a mass ratio of 4:4:1:1, and the particle size of the industrial solid waste mixture is 1.5 μm;

[0049] The alkali activator is compounded by sodium silicate and sodium hydroxide in a mass ratio of 1:1;

[0050] S2: Mix the water reducer, modified coconut shell fiber, composite tackifier, and deionized water to obtain the mixed base material B;

[0051] The water reducer is a polycarboxylate water reducer;

[0052] The preparation of the modified coconut shell fiber includes the following steps:

[0053] (1) Mix 10 g of coconut shell fiber and 350 mL of sodium hydroxide solution with a mass fraction of 18%, stir for 1.5 h, wash and dry, place in 200 mL of deionized water, keep warm at 20 °C for 35 min, add 80 mL of sodium hydroxide solution with a mass fraction of 30% and 60 mL of epichlorohydrin, stir at 35 °C for 2.5 h, wash and dry to obtain epoxidized coconut shell fiber;

[0054] (2) Mix 10 g of epoxidized coconut shell fiber and 240 mL of 1,2-dichloroethane, perform ultrasonic treatment for 12 min, add a mixture of 6 g of branched polyethyleneimine and 180 mL of 1,2-dichloroethane, keep warm in a water bath at 40 °C for 2.5 h, add 3 g of triglycidyl p-aminophenol, continue to keep warm for 2.5 h, filter, wash, and dry to obtain the modified coconut shell fiber;

[0055] The preparation of the composite tackifier includes the following steps:

[0056] 1) Mix 7.5 mL of absolute ethanol, 1 mL of deionized water, 0.5 mmol of 3-[(2,3)-epoxypropoxy]propylmethyldimethoxysilane, and 1 mmol of dimethyldimethoxysilane, stir for 9 min, heat up to 70 °C, add 1 phr of dibutyltin dilaurate, keep warm for 3.5 h, add 1 mmol of dimethylethoxyvinylsilane and keep warm for 3.5 h, perform rotary evaporation under reduced pressure to obtain vinyl-terminated epoxy silicone;

[0057] 2) Under a nitrogen atmosphere, mix 30 mL of deionized water and 2.4 g of isopentenol polyoxyethylene ether, successively add 9.9 g of N,N-dimethylacrylamide and 7.2 g of acrylic acid, add a mixture of 3.5 g of vinyl-terminated epoxy silicone and 30 mL of ethanol, adjust the pH value of the solution to 7.5, add a mixture of 230 mg of 2,2'-azobis(2-methylpropionamidine) dihydrochloride and 1 mL of deionized water, keep warm for 3.5 h, and cool to obtain the composite tackifier;

[0058] S3: Mix the mixed base material A and the mixed base material B, then pour, mold, and cure to prepare a high-strength fluidized solidified soil using industrial solid waste mixture;

[0059] By weight, the raw material composition of the fluid-solidified soil is: 54 parts of industrial solid waste mixture, 83 parts of redundant soil, 1.5 parts of alkali activator, 1.5 parts of water reducer, 6 parts of modified coconut shell fiber, 6 parts of composite thickener, and 60 parts of deionized water.

[0060] Example 3: A method for preparing high-strength fluid-solidified soil using industrial solid waste, comprising the following steps:

[0061] S1: Mix the industrial solid waste mixture, redundant soil, and alkali activator to obtain a mixed base material A;

[0062] The industrial solid waste mixture is obtained by compounding steel slag, mineral powder, carbide slag, and phosphogypsum in a mass ratio of 4:4:1:1, and the particle size of the industrial solid waste mixture is 1.5 μm;

[0063] The alkali activator is compounded by sodium silicate and sodium hydroxide in a mass ratio of 1:1;

[0064] S2: Mix the water reducer, modified coconut shell fiber, composite thickener, and deionized water to obtain a mixed base material B;

[0065] The water reducer is a polycarboxylate water reducer;

[0066] The preparation of the modified coconut shell fiber includes the following steps:

[0067] (1) Mix 10 g of coconut shell fiber and 350 mL of sodium hydroxide solution with a mass fraction of 18%, stir for 2 h, wash and dry, place in 200 mL of deionized water, keep warm at 25 °C for 30 min, add 80 mL of sodium hydroxide solution with a mass fraction of 30% and 60 mL of epichlorohydrin, stir at 40 °C for 2 h, wash and dry to obtain epoxidized coconut shell fiber;

[0068] (2) Mix 10 g of epoxidized coconut shell fiber and 240 mL of 1,2-dichloroethane, ultrasonically treat for 15 min, add a mixture of 6 g of branched polyethyleneimine and 180 mL of 1,2-dichloroethane, keep warm in a water bath at 42 °C for 2 h, add 3 g of triglycidyl p-aminophenol, continue to keep warm for 3 h, filter, wash, and dry to obtain modified coconut shell fiber;

[0069] The preparation of the composite thickener includes the following steps:

[0070] 1) Mix 7.5 mL of absolute ethanol, 1 mL of deionized water, 0.5 mmol of 3-[(2,3)-epoxypropoxy]propylmethyldimethoxysilane, and 1 mmol of dimethyldimethoxysilane, stir for 10 min, heat up to 72 °C, add 1 phr of dibutyltin dilaurate, keep warm for 4 h, add 1 mmol of dimethylethoxyvinylsilane and keep warm for 4 h, and carry out rotary evaporation under reduced pressure to obtain vinyl-terminated epoxy organosilicon;

[0071] 2) Under a nitrogen atmosphere, 30 mL of deionized water and 2.4 g of isopentenyl polyoxyethylene ether were mixed, and 9.9 g of N,N-dimethylacrylamide and 7.2 g of acrylic acid were added successively. Then, a mixture of 3.5 g of vinyl-terminated epoxy organosilicon and 30 mL of ethanol was added. The pH value of the solution was adjusted to 8.1, and a mixture of 230 mg of 2,2'-azobis(2-methylpropionamidine) dihydrochloride and 1 mL of deionized water was added. The mixture was kept warm for 4 h and then cooled to obtain a composite tackifier.

[0072] S3: Mix the mixed base material A and the mixed base material B, and then pour, mold, and cure to prepare high-strength fluidized solidified soil using industrial solid waste mixture.

[0073] By weight, the raw material composition of the fluidized solidified soil is as follows: 62 parts of industrial solid waste mixture, 93 parts of redundant soil, 2 parts of alkali activator, 2 parts of water reducer, 9 parts of modified coconut shell fiber, 9 parts of composite tackifier, and 65 parts of deionized water.

[0074] Comparative Example 1: Taking Example 3 as the control group, coconut shell fiber was used to replace the modified coconut shell fiber, and other processes were normal.

[0075] Comparative Example 2: Taking Example 3 as the control group, vinyl-terminated epoxy organosilicon was not prepared, and other processes were normal.

[0076] Sources of the raw materials used (only for demonstration examples):

[0077] Redundant soil (particle size of 2 μm, mass volume of 1.42 g / cm -3 , water content of 8.5%): By mass fraction, silica 54.1%, calcium oxide 14.8%, alumina 19.1%, iron oxide 4.7%, magnesium oxide 1.7%, sulfur trioxide 1.2%, commercially available;

[0078] Main chemical composition of steel slag: By mass fraction, silica 18.1%, calcium oxide 19.8%, alumina 8.7%, iron oxide 23%, magnesium oxide 14.4%, potassium oxide 0.3%, sulfur trioxide 0.5%, phosphorus pentoxide 0.8%, commercially available;

[0079] Main chemical composition of mineral powder: By mass fraction, silica 31.2%, calcium oxide 36.7%, alumina 13.7%, iron oxide 4.3%, magnesium oxide 7.1%, potassium oxide 0.3%, sodium oxide 0.2%, sulfur trioxide 0.6%, titanium oxide 0.7%, commercially available; Main chemical composition of carbide slag: calcium oxide 65.1%, silica 3.1%, alumina 1%, sodium oxide 0.2%, commercially available;

[0080] Main chemical composition of phosphogypsum: calcium oxide 15.1%, silicon oxide 19.5%, aluminum oxide 0.1%, sodium oxide 0.1%, sulfur trioxide 45.1%, magnesium oxide 0.1%, potassium oxide 0.2%, purchased commercially; Polycarboxylate superplasticizer YLD-05: Shandong Yonglida New Material Technology Co., Ltd.;

[0081] Coconut shell fiber (Hainan), purchased commercially; Isoamyl alcohol polyoxyethylene ether TPEG2400: Wuhan Karnos Technology Co., Ltd.; Epichlorohydrin E108182, Branched polyethyleneimine P434400, Tris-glycidyl p-aminophenol D102415, 3-[(2,3)-Epoxypropoxy]propylmethyldimethoxysilane G134407, Dimethyldimethoxysilane D110285, Dibutyltin dilaurate D100274, Dimethylethoxyvinylsilane D155112, N,N-Dimethylacrylamide N159036, Acrylic acid A103526, 2,2'-Azobis(2-methylpropionamidine) dihydrochloride A592259: Aladdin Reagent; Sodium silicate, Sodium hydroxide, 1,2-Dichloroethane, of analytical grade, purchased commercially.

[0082] Performance test:

[0083] Test the fluid-solidified soil prepared in the examples and comparative examples;

[0084] Compressive strength: Test a cube with a size of 70.7 mm, and refer to GB / T50081 for the test of compressive strength after 28-day curing;

[0085] Durability: Test a cube with a size of 70.7 mm, and use the hot and cold cycle method for testing. Keep the specimen at 80 °C for 2 h, take it out and put it into -10 °C for 2 h. After 10 high and low temperature cycles, test the compressive strength again and compare it with the compressive strength without the hot and cold cycle method. The compressive strength change rate within 0-1% (including 1%) is qualified, otherwise it is unqualified; The results are shown in Table 1;

[0086] Table 1

[0087]

[0088] The present invention provides a method for preparing high-strength fluid-solidified soil by using industrial solid waste. Using industrial solid waste mixtures such as steel slag, mineral powder, phosphogypsum, and carbide slag as curing agents, redundant soil as raw soil, modified coconut shell fiber as reinforcing material, and introducing a composite thickening agent, high-strength fluid-solidified soil is prepared, turning waste into treasure, realizing the resource utilization of various industrial solid wastes, realizing the green solidification of soluble phosphorus and heavy metal ions, etc., and having significant engineering and economic value.

[0089] Comparing Example 3 with Comparative Example 1, it can be seen that in order to further improve the mechanical strength of the flowable solidified soil, coconut shell fibers that are environmentally friendly, green, low-cost, easy to obtain, and have excellent mechanical properties are introduced as reinforcing materials into the flowable solidified soil. While solving the problem of fiber surplus, it plays a role in strengthening the flowable solidified soil. To improve the uniformity of the dispersion of coconut shell fibers in the flowable solidified soil, the coconut shell fibers are modified. First, the coconut shell fibers are epoxidized, and then the epoxidized coconut shell fibers are subjected to a one-pot reaction with branched polyethyleneimine and tris(2,3-epoxypropyl)p-aminophenol to obtain amino-terminated hyperbranched coconut shell fibers as modified coconut shell fibers, thereby improving the bonding strength between the coconut shell fibers and the flowable solidified soil and durably and firmly improving the mechanical strength of the flowable solidified soil.

[0090] Comparing Example 3 with Comparative Example 2, it can be seen that in the present invention, in order to effectively improve the cohesion and water retention of the flowable solidified soil, a viscosity regulator is added to the flowable solidified soil to effectively improve the overall working performance of the flowable solidified soil. To avoid the adverse effects such as poor compatibility between most existing viscosity regulators such as xanthan gum, cyclodextrin, cellulose ether, polyacrylamide, etc. and common water reducers such as polycarboxylic acid, and easy delamination when directly mixed, in the present invention, vinyl-terminated epoxy silicone is first synthesized using 3-[(2,3)-epoxypropoxy]propylmethyldimethoxysilane, dimethyldimethoxysilane, and dimethylethoxyvinylsilane as raw materials, and then a composite thickener is synthesized using vinyl-terminated epoxy silicone, isopentenol polyoxyethylene ether, N,N-dimethylacrylamide, and acrylic acid as raw materials through free radical polymerization. When it is introduced into the flowable solidified soil, while improving the stability of the flowable solidified soil, it significantly plays a role in thickening, anti-segregation, and reducing the bleeding rate, and promotes the development of its later strength, thereby greatly improving the durability of the flowable solidified soil.

[0091] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural transformations made using the description of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for preparing high-strength fluidized solidified soil using industrial solid waste, characterized in that: The following steps are involved: S1: mixing industrial solid waste mixture, redundant soil and alkali activator to obtain mixed base material A; S2: mixing a water reducing agent, modified coconut shell fiber, a composite tackifier and water to obtain a mixed base material B; S3: Mixing mixed base material A and mixed base material B, and then pouring, molding and curing, is a method of preparing high-strength fluidized solidified soil using industrial solid waste mixture.

2. The method for preparing high-strength fluidized solidified soil using industrial solid waste according to claim 1, characterized in that: The industrial solid waste mixture is obtained by mixing steel slag, mineral powder, carbide slag and phosphogypsum in a mass ratio of 4:4:1:1, and the particle size of the industrial solid waste mixture is 1-2 μm.

3. The method for preparing high-strength fluidized solidified soil using industrial solid waste according to claim 1, characterized in that: The water reducer is one or more of polycarboxylate water reducer, naphthalene water reducer, aminosulfonate water reducer and sodium lignin sulfonate.

4. The method for preparing high-strength fluidized solidified soil using industrial solid waste according to claim 1, characterized in that: The alkaline activator is one or more of sodium silicate, sodium hydroxide and sodium carbonate.

5. According to the method for preparing high-strength fluidized solidified soil using industrial solid waste according to claim 1, the raw materials of the fluidized solidified soil are composed of: 48-62 parts of industrial solid waste mixture, 73-93 parts of redundant soil, 1-2 parts of alkali activator, 1-2 parts of water reducer, 3-9 parts of modified coconut shell fiber, 3-9 parts of composite viscosity enhancer, and 50-65 parts of water.

6. The method for preparing high-strength fluidized solidified soil using industrial solid waste according to claim 1, characterized in that: The preparation of the modified coconut shell fiber comprises the following steps: (1) mixing coconut shell fiber and sodium hydroxide solution, stirring for 1-2 hours, washing, drying, placing in deionized water, keeping warm at 18-25° C. for 30-40 minutes, adding sodium hydroxide solution and epichlorohydrin, stirring at 30-40° C. for 2-3 hours, washing, drying, and obtaining epoxidized coconut shell fiber; (2) Epoxidized coconut shell fiber and 1,2-dichloroethane are mixed, ultrasonically treated for 10-15 minutes, a mixed solution of branched polyethyleneimine and 1,2-dichloroethane is added, and the mixture is kept warm in a water bath at 38-42° C. for 2-3 hours, triglycidyl p-aminophenol is added, and the mixture is kept warm for another 2-3 hours, filtered, washed, and dried to obtain modified coconut shell fiber.

7. The method for preparing high-strength fluidized solidified soil using industrial solid waste according to claim 6, characterized in that: The mass ratio of epoxidized coconut shell fiber, branched polyethyleneimine and triglycidyl p-aminophenol is 10:6:

3.

8. The method for preparing high-strength fluidized solidified soil using industrial solid waste according to claim 1, characterized in that: The preparation of the composite tackifier comprises the following steps: 1) Anhydrous ethanol, deionized water, 3-[(2,3)-epoxypropoxy]propylmethyldimethoxysilane and dimethyldimethoxysilane are mixed, stirred for 8-10 minutes, heated to 68-72°C, dibutyltin dilaurate is added, and the temperature is kept for 3-4 hours, dimethylethoxyvinylsilane is added, and the temperature is kept for 3-4 hours, and vacuum rotary evaporation is performed to obtain vinyl-terminated epoxy silicone; 2) Under a nitrogen atmosphere, deionized water and isopentanol polyoxyethylene ether are mixed, N,N-dimethylacrylamide and acrylic acid are added in sequence, a mixture of vinyl-terminated epoxy silicone and ethanol is added, the pH value of the solution is adjusted to 7.1-8.1, a mixture of azobisisobutylimidazoline hydrochloride and deionized water is added, the mixture is kept warm for 3-4 hours, and cooled to obtain a composite tackifier.

9. The method for preparing high-strength fluidized solidified soil using industrial solid waste according to claim 8, characterized in that: The molar ratio of 3-[(2,3)-epoxypropyloxy]propylmethyldimethoxysilane to dimethyldimethoxysilane is 1:

2.

10. The method for preparing high-strength fluidized solidified soil using industrial solid waste according to claim 8, characterized in that: The mass ratio of isopentanol polyoxyethylene ether, N,N-dimethylacrylamide, acrylic acid, and vinyl-terminated epoxy silicone is 2.4:9.9:7.2:3.5.

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