Alkali residue solid waste light-weight flow state castable for highway and preparation method of light-weight flow state castable

Abstract

The invention relates to the technical field of road materials, in particular to an alkaline residue solid waste light flow state castable for a road and a preparation method. The caustic sludge solid waste light flow state castable for the highway is prepared from the following components in parts by weight: 30 to 45 parts of fine-grained soil, 27 to 37 parts of caustic sludge white slurry, 9 to 13 parts of caustic sludge salt slurry, 5 to 10 parts of slag powder, 1.5 to 3.5 parts of fly ash, 0.1 to 0.5 part of a water reducing agent, 5 to 10 parts of water, 0.05 to 0.2 part of an air entraining agent, 0.1 to 0.5 part of a waterproof agent, 1 to 4 parts of a foaming agent and 0.5 to 1.0 part of a foam stabilizer. Through the synergistic effect of the fine-grained soil, the alkaline residue solid waste, the slag powder, the fly ash and multiple auxiliaries, the early strength and the hardening speed of the castable are remarkably improved, and the construction period is shortened; under the same strength, the flowing property is good, the density is small, and meanwhile high-value utilization of the alkaline residue solid waste is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of road materials, and specifically to a lightweight fluid castable made from alkali residue solid waste for highways and a preparation method thereof. Background Art

[0002] In road engineering construction, it is difficult to adopt the vibration compaction process of subgrade soil in construction-restricted areas such as abutments and retaining walls, and self-compacting fluid fillers are often used for pouring. In the cement fluid soil, the cement dosage is relatively high, the density is relatively large, and the strength growth is slow.

[0003] Alkali residue solid waste is an industrial by-product of the soda industry, including white mud and salt mud, which mostly contain calcium chloride, gypsum hydrate, a small amount of calcium hydroxide, and magnesium hydroxide, have a relatively high water content, a comprehensive utilization rate of less than 10%, and are prone to chloride ion precipitation, which has an impact on the surrounding environment. Developing lightweight fluid fillers for highways using alkali residue solid waste has the characteristics of self-leveling, compaction-free, and low density, can realize the high-value utilization of alkali residue solid waste, simultaneously meet the self-compacting pouring of highway abutments, retaining walls and other parts, and effectively solidify free chloride ions.

[0004] Therefore, we propose a lightweight fluid castable made from alkali residue solid waste for highways and a preparation method thereof. Summary of the Invention

[0005] The purpose of the present invention is to provide a lightweight fluid castable made from alkali residue solid waste for highways and a preparation method thereof to solve the problems raised in the prior art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A lightweight fluid castable made from alkali residue solid waste for highways, comprising the following weight components:

[0008] 30 - 45 parts of fine-grained soil, 27 - 37 parts of alkali residue white mud slurry, 9 - 13 parts of alkali residue salt mud slurry, 5 - 10 parts of slag powder, 1.5 - 3.5 parts of fly ash, 0.1 - 0.5 parts of water reducing agent, 5 - 10 parts of water, 0.05 - 0.2 parts of air-entraining agent, 0.1 - 0.5 parts of waterproof agent, 1 - 4 parts of foaming agent, 0.5 - 1.0 parts of foam stabilizer.

[0009] Further, the water content of the fine-grained soil is 5wt%.

[0010] Further, the solid content of the alkali residue white mud slurry is 30 - 35wt%, and the rest is water.

[0011] Further, the solid content of the alkali residue salt mud slurry is 40 - 50wt%, and the rest is water.

[0012] Further, the water reducing agent is a polycarboxylate water reducing agent.

[0013] Further, the air-entraining agent is sodium rosinate air-entraining agent.

[0014] Further, the waterproofing agent is sodium methyl silicate.

[0015] Further, the foaming agent is a composite foaming agent.

[0016] Further, the foam stabilizer is hydroxypropyl methylcellulose.

[0017] A preparation method of an alkali residue solid waste lightweight fluid casting material for roads comprises the following steps:

[0018] Step S1: Slurry premixing: Mix the alkali residue white mud slurry and the alkali residue salt mud slurry in a high-speed shearer for 3 - 5 min at a shear speed of 1200 - 1500 rpm to form a slurry;

[0019] Step S2: Dry material blending: Sequentially add slag powder, fly ash, and fine-grained soil to the slurry, and continue stirring for 5 - 10 min to form a mixture;

[0020] Step S3: Additive introduction: Add aqueous solutions of a water reducer, an air-entraining agent, and a waterproofing agent to the mixture in three portions at intervals of 3 - 5 min each, then add a foaming agent and a foam stabilizer, and stir evenly to obtain an alkali residue solid waste lightweight fluid casting material for roads.

[0021] Further, the slag powder is subjected to modification treatment, and the specific process is as follows:

[0022] Step A: Ultrasonically disperse the slag powder in absolute ethanol, add a mixed solution of 3-trimethoxysilylpropyl acrylate, tetraethyl orthosilicate, and absolute ethanol, adjust the pH to 9 - 11 using ammonia water, react at 40 - 50 °C for 10 - 12 h, and after centrifugation, washing, and drying, obtain double-bonded silica-modified slag powder;

[0023] Step B: Mix epoxidized lignosulfonate, double-bonded glycol chitosan, and dimethyl sulfoxide evenly, and react at 40 - 60 °C for 6 - 8 h to obtain modified lignin;

[0024] Step C: Ultrasonically disperse the double-bonded silica-modified slag powder in deionized water, add methyl methacrylate, methacrylamide, modified lignin, and a cationic monomer, introduce nitrogen gas, add potassium persulfate, react at 70 - 80 °C for 10 - 12 h, and after centrifugation, washing, and drying, obtain modified slag powder.

[0025] Further, in the said Step A, the mass ratio of the slag powder to the absolute ethanol is 1:(20 - 40).

[0026] Further, in the step A, the mass of 3-trimethoxysilylpropyl acrylate is 1-2 times the mass of the slag powder; the mass ratio of 3-trimethoxysilylpropyl acrylate, tetraethyl orthosilicate and absolute ethanol is 1:(0.5-0.8):(8-10).

[0027] Further, in the step B, the mass ratio of sodium lignosulfonate epoxide, double bond-containing glycol chitosan and dimethyl sulfoxide is 1:(0.5-1.0):(3-5).

[0028] Further, in the step C, the mass ratio of double bond-functionalized silica-modified slag powder, methyl methacrylate, methacrylamide, modified lignin, cationic monomer, deionized water and potassium persulfate is 1:(1.5-2.0):(1-2):(0.5-1.0):(1.0-1.5):(10-15):(0.1-0.3).

[0029] Further, the preparation method of the cationic monomer is as follows:

[0030] Mix octadecylamine, allyl bromide and absolute ethanol evenly, introduce nitrogen gas, react at 60-70 °C for 20-24 h, and obtain the cationic monomer after vacuum distillation, recrystallization, washing and drying.

[0031] In the above technical solution, by reacting octadecylamine with allyl bromide, a hydrophobic alkyl long chain and a double bond are introduced to prepare N,N-dimethyloctadecylallylammonium bromide, that is, the cationic monomer.

[0032] Further, the mass ratio of octadecylamine, allyl bromide and absolute ethanol is 1:(0.5-0.7):(10-12).

[0033] Further, the preparation method of the sodium lignosulfonate epoxide is as follows:

[0034] Mix sodium lignosulfonate and sodium hydroxide solution evenly, heat up to 70-80 °C, add epichlorohydrin, react for 4-6 h, and obtain sodium lignosulfonate epoxide after filtration, washing and drying.

[0035] Further, the mass ratio of sodium lignosulfonate and sodium hydroxide solution is 1:(10-12), and the concentration of the sodium hydroxide solution is 35-40 wt%.

[0036] Further, the mass of epichlorohydrin is 0.3-0.5 times the mass of sodium lignosulfonate.

[0037] In the above technical solution, epichlorohydrin is used to epoxidize and modify sodium lignosulfonate to obtain sodium lignosulfonate epoxide.

[0038] Furthermore, the preparation method of the double-bond-containing glycol chitosan is as follows:

[0039] Mix the aqueous solution of glycol chitosan and the aqueous ethanol solution of octenyl succinic anhydride evenly, adjust the pH to 8.3 - 8.5, react at 30 - 40 °C for 22 - 24 h, and after dialysis and drying, obtain the double-bond-containing glycol chitosan.

[0040] Furthermore, the concentration of the aqueous solution of glycol chitosan is 1 - 3 wt%.

[0041] Furthermore, the concentration of the aqueous ethanol solution of octenyl succinic anhydride is 10 - 12 wt%, and its dosage is 0.1 - 0.2 times the mass of the aqueous solution of glycol chitosan.

[0042] Based on the above technical solution, octenyl succinic anhydride is used to partially hydrophobically modify water-soluble glycol chitosan (GC), introducing double bonds and hydrophobic groups to form an amphiphilic derivative, namely double-bond-containing glycol chitosan.

[0043] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0044] 1. A kind of alkali residue solid waste lightweight flowing castable for highway and its preparation method of the present invention, through the combined action of fine-grained soil, alkali residue white mud, alkali residue salt mud, slag powder, fly ash and various additives, prepare the alkali residue solid waste lightweight flowing castable; it has the advantages of high early strength and fast hardening speed, accelerating the construction progress; under the same strength conditions, the fluidity is better than that of traditional castables, and the density is smaller (lightweight); at the same time, the high-value utilization of alkali residue solid waste is realized, promoting the sustainable development of environmental protection and resources.

[0045] 2. A kind of alkali residue solid waste lightweight flowing castable for highway and its preparation method of the present invention, on this basis, in this application, the surface of the slag powder is modified to strengthen the interaction between the slag powder and the matrix, reduce interface defects, and improve the overall mechanical properties and durability of the material; first, acrylic silane coupling agent (3-trimethoxysilylpropyl acrylate) and tetraethyl orthosilicate are hydrolyzed synergistically in an alkaline environment to form a double-bond-functionalized silica coating layer on the surface of the slag powder, obtaining double-bonded silica-modified slag powder; then, epoxidized lignosulfonate reacts with the amino group in the double-bond-containing glycol chitosan to introduce double bonds, obtaining modified lignin.

[0046] Finally, by using the method of free radical polymerization, the double-bonded silica-modified slag powder, methyl methacrylate, methacrylamide, modified lignin and cationic monomer are reacted to form an organic-inorganic hybrid structure, and the modified slag powder is prepared, which significantly improves the activity and interfacial compatibility of the slag powder, has amphiphilic properties. Its hydrophilic segments form hydrogen bonds or chemical bonds with inorganic matrices (such as fine-grained soil, fly ash) through active groups such as sulfonic acid groups, amino groups, and hydroxyl groups, enhancing the interfacial bonding force and reducing pores and microcracks; its hydrophobic segments contribute to reducing the water absorption rate of the castable through alkyl long chains and ester groups, thereby improving its water resistance, and further improving the bonding property, fluidity and compressive strength of the castable, while enhancing its durability. In addition, since the soluble salts (such as chloride ions, sodium ions) in the alkali slag are easily migrated to the surface with water to form efflorescence, the hydrophobic segments block the capillary pores to reduce the salt exudation, and the hydrophilic segments adsorb part of the water and fix the salts through hydration reactions, and the dual effects solve the salt damage problem of the alkali slag solid waste. Description of the Drawings

[0047] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0048] Figure 1 is the micrograph of the alkali slag solid waste lightweight fluid castable for highways in the present invention. Detailed Embodiments

[0049] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0050] In this embodiment, the fine-grained soil: the maximum particle size is less than 10 mm, and the content of particles less than 2 mm is ≥ 90%, sourced from a highway project in Dongguang County, Cangzhou; the alkali slag white slurry: sourced from Tangshan Sanyou Chemical Co., Ltd.; the alkali slag salt slurry: sourced from Tangshan Sanyou Chemical Co., Ltd.; the slag powder: S95 grade slag powder, sourced from Shandong Kefa Building Materials Co., Ltd.; the fly ash: first-class fly ash, with a particle size of 200 - 300 mesh, sourced from Jining Hengzhi New Building Materials Co., Ltd.; the water reducer: polycarboxylate water reducer, model PC-1030; the foaming agent: composite foaming agent, model HTQ-1, sourced from Henan Huatai New Materials Technology Co., Ltd.

[0051] Unless otherwise specified, the following parts are all parts by mass.

[0052] Example 1: A preparation process of a lightweight fluid casting material for highway using alkali residue solid waste, including the following processes:

[0053] Step S1: Premixing of slurry: Mix 30 parts of alkali residue white mud slurry with a solid content of 30 wt% and 10 parts of alkali residue salt mud slurry with a solid content of 40 wt% in a high-speed shear mixer for 3 minutes at a shear speed of 1200 rpm to form a slurry;

[0054] Step S2: Blending of dry materials: Add 6 parts of slag powder, 2 parts of fly ash and 31 parts of fine-grained soil to the slurry in sequence, and continue stirring for 5 minutes to form a mixture;

[0055] Step S3: Introduction of additives: Add a mixed solution of 0.2 parts of water reducer, 0.08 parts of sodium rosinate, 0.2 parts of sodium methyl silicate and 5 parts of water to the mixture in three portions at intervals of 4 minutes each, then add 1 part of foaming agent and 0.5 part of hydroxypropyl methylcellulose, and stir evenly to obtain a lightweight fluid casting material for highway using alkali residue solid waste.

[0056] Example 2: A preparation process of a lightweight fluid casting material for highway using alkali residue solid waste, including the following processes:

[0057] Step S1: Premixing of slurry: Mix 34 parts of alkali residue white mud slurry with a solid content of 32 wt% and 11 parts of alkali residue salt mud slurry with a solid content of 45 wt% in a high-speed shear mixer for 4 minutes at a shear speed of 1300 rpm to form a slurry;

[0058] Step S2: Blending of dry materials: Add 8 parts of slag powder, 2.5 parts of fly ash and 37 parts of fine-grained soil to the slurry in sequence, and continue stirring for 8 minutes to form a mixture;

[0059] Step S3: Introduction of additives: Add a mixed solution of 0.3 parts of water reducer, 0.1 parts of sodium rosinate, 0.3 parts of sodium methyl silicate and 8 parts of water to the mixture in three portions at intervals of 4 minutes each, then add 3 parts of foaming agent and 0.8 part of hydroxypropyl methylcellulose, and stir evenly to obtain a lightweight fluid casting material for highway using alkali residue solid waste.

[0060] Example 3: A preparation process of a lightweight fluid casting material for highway using alkali residue solid waste, including the following processes:

[0061] Step S1: Premixing of slurry: Mix 36 parts of alkali residue white mud slurry with a solid content of 35 wt% and 12 parts of alkali residue salt mud slurry with a solid content of 50 wt% in a high-speed shear mixer for 5 minutes at a shear speed of 1500 rpm to form a slurry;

[0062] Step S2: Blending of dry materials: Add 9 parts of slag powder, 3 parts of fly ash and 42 parts of fine-grained soil to the slurry in sequence, and continue stirring for 10 minutes to form a mixture;

[0063] Step S3: Additive introduction: Add a mixed solution of 0.4 parts of water reducing agent, 0.15 parts of sodium rosinate, 0.4 parts of sodium methyl silicate and 10 parts of water to the mixture in three times, with an interval of 5 minutes each time, then add 3 parts of foaming agent and 0.8 parts of hydroxypropyl methyl cellulose, and stir evenly to obtain a lightweight fluid castable made from alkali residue solid waste for road use.

[0064] Example 4: A preparation process of a lightweight fluid castable made from alkali residue solid waste for road use, including the following processes:

[0065] Step S1: Slurry premixing: Mix 27 parts of alkali residue white mud slurry with a solid content of 35 wt% and 9 parts of alkali residue salt mud slurry with a solid content of 50 wt% in a high-speed shearer for 3 minutes, with a shear speed of 1200 rpm, to form a slurry;

[0066] Step S2: Dry material blending: Add 5 parts of slag powder, 1.5 parts of fly ash and 30 parts of fine-grained soil to the slurry in sequence, and continue to stir for 5 minutes to form a mixture;

[0067] Step S3: Additive introduction: Add a mixed solution of 0.1 part of water reducing agent, 0.05 part of sodium rosinate, 0.1 part of sodium methyl silicate and 5 parts of water to the mixture in three times, with an interval of 3 minutes each time, then add 1 part of foaming agent and 0.5 part of hydroxypropyl methyl cellulose, and stir evenly to obtain a lightweight fluid castable made from alkali residue solid waste for road use;

[0068] The slag powder is subjected to modification treatment, and the specific process is as follows:

[0069] Step A: Ultrasonically disperse 5 parts of slag powder in 100 parts of absolute ethanol, add a mixed solution of 5 parts of 3-trimethoxysilylpropyl acrylate, 2.5 parts of tetraethyl orthosilicate and 40 parts of absolute ethanol, adjust the pH = 9 with ammonia water, react at 40 °C for 10 h, and after centrifugation, washing and drying, obtain double-bonded silica-modified slag powder;

[0070] Step B: Mix 3 parts of sodium lignosulfonate and 30 parts of 35 wt% sodium hydroxide solution evenly, heat up to 70 °C, add 0.9 part of epichlorohydrin, react for 4 h, and after filtration, washing and drying, obtain epoxidized sodium lignosulfonate;

[0071] Mix 100 parts of 1 wt% glycol chitosan aqueous solution and 10 parts of 10 wt% octenyl succinic anhydride ethanol aqueous solution evenly, adjust the pH to 8.3, react at 30 °C for 22 h, and after dialysis and drying, obtain double-bonded glycol chitosan;

[0072] Mix 2 parts of epoxidized sodium lignosulfonate, 1 part of double-bonded glycol chitosan and 6 parts of dimethyl sulfoxide evenly, react at 40 °C for 6 h, and obtain modified lignin;

[0073] Step C: Ultrasonically disperse 5 parts of double-bonded silica-modified slag powder in 50 parts of deionized water, add 7.5 parts of methyl methacrylate, 5 parts of methacrylamide, 2.5 parts of modified lignin, and 5 parts of cationic monomer. Pass in nitrogen, add 0.5 part of potassium persulfate, and react at 70 °C for 10 h. After centrifugation, washing, and drying, the modified slag powder is obtained;

[0074] The preparation method of the cationic monomer is as follows:

[0075] Mix 5 parts of octadecyl tertiary amine, 2.5 parts of allyl bromide, and 50 parts of absolute ethanol evenly, pass in nitrogen, and react at 60 °C for 20 h. After vacuum distillation, recrystallization, washing, and drying, the cationic monomer is obtained.

[0076] Example 5: A preparation process of an alkali slag solid waste lightweight fluidized casting material for highways, including the following processes:

[0077] Step S1: Slurry premixing: Mix 32 parts of alkali slag white mud slurry with a solid content of 32 wt% and 10 parts of alkali slag salt mud slurry with a solid content of 45 wt% in a high-speed shearer for 4 min, and the shear speed is 1300 rpm to form a slurry;

[0078] Step S2: Dry material blending: Add 8 parts of slag powder, 2.5 parts of fly ash, and 36 parts of fine-grained soil to the slurry in sequence, and continue stirring for 8 min to form a mixture;

[0079] Step S3: Additive introduction: Add a mixed solution of 0.4 part of water reducer, 0.1 part of sodium rosinate, 0.3 part of sodium methyl silicate, and 9 parts of water to the mixture in three times, with an interval of 4 min each time, and then add 3 parts of foaming agent and 0.8 part of hydroxypropyl methyl cellulose, and stir evenly to obtain an alkali slag solid waste lightweight fluidized casting material for highways;

[0080] The slag powder is modified, and the specific process is as follows:

[0081] Step A: Ultrasonically disperse 8 parts of slag powder in 240 parts of absolute ethanol, add a mixed solution of 12 parts of 3-trimethoxysilylpropyl acrylate, 8.4 parts of tetraethyl orthosilicate, and 108 parts of absolute ethanol, adjust the pH = 10 with ammonia water, and react at 45 °C for 11 h. After suction filtration, washing, and drying, the double-bonded silica-modified slag powder is obtained;

[0082] Step B: Mix 6 parts of sodium lignosulfonate and 66 parts of 38 wt% sodium hydroxide solution evenly, heat up to 75 °C, add 2.4 parts of epichlorohydrin, react for 5 h, and after filtration, washing, and drying, obtain epoxidized sodium lignosulfonate;

[0083] Mix 240 parts of 2 wt% glycol chitosan aqueous solution and 36 parts of 11 wt% octenyl succinic anhydride ethanol aqueous solution evenly, adjust the pH to 8.4, react at 35 °C for 23 h, and after dialysis and drying, obtain double bond-containing glycol chitosan;

[0084] Mix 6 parts of sodium lignosulfonate epoxide, 4.8 parts of double bond-containing glycol chitosan and 24 parts of dimethyl sulfoxide evenly, react at 50 °C for 7 h, and obtain modified lignin;

[0085] Step C: Ultrasonically disperse 8 parts of double bond-modified silica slag powder in 96 parts of deionized water, add 14 parts of methyl methacrylate, 12 parts of methacrylamide, 6 parts of modified lignin and 10 parts of cationic monomer, introduce nitrogen, add 1.6 parts of potassium persulfate, react at 75 °C for 11 h, and after centrifugation, washing and drying, obtain modified slag powder;

[0086] The preparation method of the cationic monomer is as follows:

[0087] Mix 10 parts of tertiary octylamine, 6 parts of allyl bromide and 110 parts of absolute ethanol evenly, introduce nitrogen, react at 65 °C for 22 h, and after vacuum distillation, recrystallization, washing and drying, obtain the cationic monomer.

[0088] Example 6: A preparation process of an alkali slag solid waste lightweight flowing casting material for roads, including the following processes:

[0089] Step S1: Premix the slurry: Mix 37 parts of alkali slag white mud slurry with a solid content of 30 wt% and 13 parts of alkali slag salt mud slurry with a solid content of 40 wt% in a high-speed shearer for 5 min, and the shear speed is 1500 rpm to form a slurry;

[0090] Step S2: Mix dry materials: Add 10 parts of slag powder, 3.5 parts of fly ash and 45 parts of fine-grained soil to the slurry in sequence, and continue to stir for 10 min to form a mixture;

[0091] Step S3: Introduce additives: Add a mixed solution of 0.5 part of water reducer, 0.2 part of sodium rosinate, 0.5 part of sodium methyl silicate and 10 parts of water to the mixture in three times, with an interval of 5 min each time, and then add 4 parts of foaming agent and 1.0 part of hydroxypropyl methyl cellulose, and stir evenly to obtain an alkali slag solid waste lightweight flowing casting material for roads;

[0092] The slag powder has been modified, and the specific process is as follows:

[0093] Step A: Ultrasonically disperse 10 parts of slag powder in 400 parts of absolute ethanol, add a mixed solution of 20 parts of 3 - trimethoxysilylpropyl acrylate, 16 parts of tetraethyl orthosilicate and 200 parts of absolute ethanol, adjust the pH to 11 using ammonia water, react at 50 °C for 12 h, and after suction filtration, washing and drying, obtain double - bond - modified silica - modified slag powder;

[0094] Step B: Mix 10 parts of sodium lignosulfonate evenly with 120 parts of 40 wt% sodium hydroxide solution, heat up to 80 °C, add 5 parts of epichlorohydrin, react for 6 h, and after filtration, washing and drying, obtain epoxidized sodium lignosulfonate;

[0095] Mix 300 parts of 3 wt% glycol chitosan aqueous solution evenly with 60 parts of 12 wt% octenyl succinic anhydride ethanol aqueous solution, adjust the pH to 8.5, react at 40 °C for 24 h, and after dialysis and drying, obtain double - bond - containing glycol chitosan;

[0096] Mix 10 parts of epoxidized sodium lignosulfonate, 10 parts of double - bond - containing glycol chitosan and 50 parts of dimethyl sulfoxide evenly, react at 60 °C for 8 h, and obtain modified lignin;

[0097] Step C: Ultrasonically disperse 10 parts of double - bond - modified silica - modified slag powder in 150 parts of deionized water, add 20 parts of methyl methacrylate, 20 parts of methacrylamide, 10 parts of modified lignin and 15 parts of cationic monomer, introduce nitrogen, add 3 parts of potassium persulfate, react at 80 °C for 12 h, and after centrifugation, washing and drying, obtain modified slag powder;

[0098] The preparation method of the cationic monomer is as follows:

[0099] Mix 15 parts of octadecyl tertiary amine, 10.5 parts of allyl bromide and 180 parts of absolute ethanol evenly, introduce nitrogen, react at 70 °C for 24 h, and after vacuum distillation, recrystallization, washing and drying, obtain the cationic monomer.

[0100] Comparative Example 1: A preparation process of a light - weight fluid - state casting material for highway using alkali residue solid waste, including the following process:

[0101] Compared with Example 5, Comparative Example 1 does not add modified lignin, and other steps are the same as those in Example 5.

[0102] Comparative Example 2: A preparation process of a light - weight fluid - state casting material for highway using alkali residue solid waste, including the following process:

[0103] Compared with Example 5, Comparative Example 2 does not add the cationic monomer, and other steps are the same as those in Example 5.

[0104] Comparative Example 3: A preparation process of a light - weight fluid - state casting material for highway using alkali residue solid waste, including the following process:

[0105] The slag powder is modified, and the specific process is as follows:

[0106] Step A: Ultrasonically disperse 8 parts of slag powder in 240 parts of absolute ethanol, add a mixed solution of 12 parts of 3-trimethoxysilylpropyl acrylate and 108 parts of absolute ethanol, adjust the pH to 10 using ammonia water, react at 45°C for 11 h, and after suction filtration, washing, and drying, obtain double-bonded silica-modified slag powder;

[0107] Compared with Example 5, in Comparative Example 3, the modified slag powder was replaced with double-bonded silica-modified slag powder, and other steps were the same as those in Example 5.

[0108] Comparative Example 4: A preparation process of an alkali slag solid waste lightweight flowing casting material for roads, including the following process:

[0109] Compared with Example 5, in Comparative Example 4, the modified lignin was replaced with sodium lignosulfonate, and other steps were the same as those in Example 5.

[0110] Experiment: Take the alkali slag solid waste lightweight flowing casting materials obtained in Examples 1-6 and Comparative Examples 1-4, prepare specimens, and detect their properties respectively and record the test results:

[0111] Determine the fluidity with reference to the ASTM D6103-17 standard, using a cylindrical cylinder with upper and lower openings of ф75 mm×150 mm; determine the compressive strength with reference to the "Standard Test Method for Basic Properties of Building Mortars" JGJ / T 70-2009. The specimens are cube test blocks of 70.7 mm×70.7 mm×70.7 mm. After the specimens are cast and demolded, they are placed in a standard curing room at (20±2)°C until the test age (7, 28 d). The loading rate is 1 mm / min. Use absolute ethanol to terminate the hydration, place the broken specimens in an oven at 45°C and dry them to a constant weight. The test results are all measured from 3 groups of parallel specimens.

[0112] The test results are shown in Table 1.

[0113] Table 1 Performance test results of alkali slag solid waste lightweight flowing casting materials for roads

[0114]

[0115] According to the data in the above table, the following conclusions can be clearly obtained:

[0116] 1. Compared with Examples 1-3, the properties of the products obtained in Examples 4-6 are better. It can be seen that by modifying the slag powder in this application, the fluidity and mechanical properties of the material are further improved.

[0117] 2. Compared with Examples 4-6, the performance of the products obtained in Comparative Examples 1-2 decreased. This shows that by introducing modified lignin and cationic monomers together, the present invention improves the interfacial bonding strength, dispersion stability and functional synergy of the material. In Comparative Example 1, no modified lignin was added, resulting in a decrease in the interfacial compatibility of the material and a reduction in the compressive strength. In Comparative Example 2, no cationic monomer was added, and the particles were easily agglomerated due to electrostatic attraction, resulting in a significant decrease in fluidity.

[0118] 3. Compared with Examples 4-6, the performance of the products obtained in Comparative Examples 3-4 decreased. This indicates that the modified slag powder prepared by the present invention has amphiphilicity, which can improve the overall compatibility and mechanical properties of the material. Compared with sodium lignosulfonate, the modified lignin prepared by the present invention has better reactivity, thus significantly improving the mechanical properties and fluidity of the material.

[0119] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0120] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be construed as limiting the corresponding claims.

Claims

1. A lightweight flowing castable made of alkali residue solid waste for highways, characterized in that: It includes the following weight components: 30 - 45 parts of fine-grained soil, 27 - 37 parts of alkali residue white mud slurry, 9 - 13 parts of alkali residue salt mud slurry, 5 - 10 parts of slag powder, 1.5 - 3.5 parts of fly ash, 0.1 - 0.5 parts of water reducing agent, 5 - 10 parts of water, 0.05 - 0.2 parts of air-entraining agent, 0.1 - 0.5 parts of waterproof agent, 1 - 4 parts of foaming agent, 0.5 - 1.0 parts of foam stabilizer.

2. The light-weight flowing castable made from soda residue solid waste for highway according to claim 1, wherein: The solid content of the alkali residue white mud slurry is 30 - 35wt%, and the rest is water.

3. The lightweight fluid casting material for highway made of alkali residue solid waste according to claim 1, characterized in that: The solid content of the alkali residue salt mud slurry is 40 - 50wt%, and the rest is water.

4. The light-weight flowing castable made from soda residue solid waste for highway according to claim 1, characterized in that: The water reducing agent is a polycarboxylate water reducing agent.

5. The light-weight fluid casting material for highway made of alkali residue solid waste according to claim 1, wherein: The air-entraining agent is a sodium rosinate air-entraining agent.

6. The preparation method of a lightweight fluid casting material for highway using alkali residue solid waste according to any one of claims 1-5, characterized in that: It includes the following steps: Step S1: Premixing of slurry: Mix the alkali residue white mud slurry and alkali residue salt mud slurry in a high-speed shearer for 3 - 5 min at a shear speed of 1200 - 1500 rpm to form a slurry. Step S2: Blending of dry materials: Add slag powder, fly ash, and fine-grained soil to the slurry in sequence and continue stirring for 5 - 10 min to form a mixture. Step S3: Introduction of additives: Add the aqueous solutions of water reducing agent, air-entraining agent, and waterproof agent to the mixture in three times, with an interval of 3 - 5 min each time, then add the foaming agent and foam stabilizer, and stir evenly to obtain a lightweight fluid casting material made from alkali residue solid waste for roads.

7. The preparation method of a light-weight flowing castable for highway using alkali residue solid waste according to claim 6, characterized in that: The slag powder is subjected to modification treatment, and the specific process is as follows: Step A: Ultrasonically disperse the slag powder in absolute ethanol, add a mixed solution of 3-trimethoxysilylpropyl acrylate, tetraethyl orthosilicate, and absolute ethanol, adjust the pH = 9 - 11 with ammonia water, react at 40 - 50 °C for 10 - 12 h, and after centrifugation, washing, and drying, obtain double-bonded silica-modified slag powder. Step B: Mix epoxidized lignosulfonate, double-bonded glycol chitosan, and dimethyl sulfoxide evenly, react at 40 - 60 °C for 6 - 8 h, and after filtration, washing, and drying, obtain modified lignin. Step C: Ultrasonically disperse the double-bonded silica-modified slag powder in deionized water, add methyl methacrylate, methylacrylamide, modified lignin, and cationic monomer, introduce nitrogen gas, add potassium persulfate, react at 70 - 80 °C for 10 - 12 h, and after centrifugation, washing, and drying, obtain modified slag powder.

8. The preparation method of a lightweight flowing castable for highway use with alkali residue solid waste according to claim 7, characterized in that: In the said Step B, the preparation method of epoxidized lignosulfonate is as follows: Mix lignosulfonate and sodium hydroxide solution evenly, raise the temperature to 70 - 80 °C, add epichlorohydrin, react for 4 - 6 h, and after filtration, washing, and drying, obtain epoxidized lignosulfonate.

9. The preparation method of a lightweight fluid casting material for highway using alkali residue solid waste according to claim 7, characterized in that: In the said Step B, the preparation method of double-bonded glycol chitosan is as follows: Mix the aqueous solution of glycol chitosan and the ethanol aqueous solution of octenyl succinic anhydride evenly, adjust the pH to 8.3 - 8.5, react at 30 - 40 °C for 22 - 24 h, and after dialysis and drying, obtain double-bonded glycol chitosan.

10. The preparation method of a light-weight fluid casting material made of alkali residue solid waste for highway according to claim 7, characterized in that: In the said Step C, the preparation method of the cationic monomer is as follows: Mix octadecyl tertiary amine, allyl bromide, and absolute ethanol evenly, introduce nitrogen gas, react at 60 - 70 °C for 20 - 24 h, and after vacuum distillation, recrystallization, washing, and drying, obtain the cationic monomer.

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