Solid waste-based gelling material modifier, gelling material and preparation method thereof

Abstract

The present invention relates to the field of solid waste cementitious materials, and more particularly to a solid waste-based cementitious material modifier, a cementitious material, and a preparation method thereof. The solid waste-based cementitious material modifier comprises the following raw materials in parts by weight: 1-5 parts of a water-reducing and dispersing component, 1-5 parts of a setting time adjusting component, 5-20 parts of a pH adjusting component, 10-40 parts of a reinforcing component, and 30-85 parts of an auxiliary component. The auxiliary component is prepared by surface modification of fly ash, modification with nano-silica, and composite activation treatment with mineral powder. The modifier can significantly improve the strength, durability, and workability of the cementitious material and reduce the setting time. The cementitious material is prepared by mixing activated gold tailings, steel slag, slag, industrial by-product gypsum, and the modifier. It is suitable for construction projects and has broad prospects.

Description

Technical Field

[0001] The present invention relates to the field of solid waste gelling materials, and in particular to a solid waste-based gelling material modifier, a gelling material and a preparation method thereof. Background Art

[0002] Cementitious material modifiers are chemical additives that regulate the setting time of cementitious materials and improve their performance and mechanical properties. They are widely used in mortar and concrete production. Existing all-solid waste cementitious materials are typically composed of activated gold tailings, steel slag, slag, and industrial by-product gypsum. While environmentally friendly, they suffer from significant drawbacks, such as high water requirements for standard consistency and poor concrete performance. These issues have severely hampered the widespread application of solid waste-based cementitious materials.

[0003] A Chinese patent application with application number CN202110692019.7 discloses a cementitious material, its preparation method, and its application. The invention provides a cementitious material, its preparation method, and its application, the main components of which are coal gangue, calcium carbide slag, and an alkaline activator (a mixed solution of sodium hydroxide aqueous solution and water glass). By combining calcium carbide slag with coal gangue, the alkaline conditions of the alkaline activator are improved, the amount of sodium hydroxide used is reduced, and at the same time, abundant calcium ions are provided for the polymerization reaction, thereby improving the compressive strength. As a result, a high-strength coal gangue-calcium carbide slag geopolymer cementitious material is successfully prepared under relatively low alkaline conditions. This cementitious material not only has good compressive strength and is suitable for rapid repair of tunnels and road surfaces, plugging foundation leaks, and solidifying weak soils, but also achieves the goals of green, low-carbon development and solid waste resource utilization. However, the above-mentioned cementitious material is only composed of coal gangue, calcium carbide slag and alkaline activator, and its performance adjustment mainly depends on the ratio of coal gangue and calcium carbide slag and the amount of alkaline activator. The adjustment means are relatively simple, and it is difficult to meet the diverse requirements of different projects for the performance of cementitious materials. Chinese patent application number CN201210596493.0 discloses a metakaolin-based inorganic composite cementitious material and its toughening modifier. The invention discloses a metakaolin-based inorganic composite cementitious material and its toughening modifier, which are composed of 60 to 80 parts by weight of fiber and 20 to 40 parts by weight of fiber suspending agent. The toughening modifier can effectively improve the toughness and bearing capacity of the metakaolin-based inorganic composite cementitious material, and the preparation process is simple and the production cost is low. However, the polypropylene fiber mentioned in the technical solution is an organic matter, and there will be problems in the interface bonding between the inorganic metakaolin and slag, which will affect the subsequent performance improvement.

[0004] Therefore, developing a solid waste-based cementitious material modifier to improve the construction performance, mechanical properties and durability of cementitious materials is the key to achieving widespread application of solid waste-based cementitious materials. Summary of the Invention

[0005] To address the above-mentioned issues, the present invention provides a solid waste-based cementitious material modifier, a cementitious material, and a method for preparing the same. Utilizing specific modifier components and a preparation method, a modifier is obtained that significantly improves the performance of cementitious materials. Application of this modifier to cementitious materials results in a cementitious material with high strength, high durability, and excellent workability.

[0006] The technical solutions adopted by the present invention to achieve the above-mentioned purpose are:

[0007] A solid waste-based gelling material modifier, comprising the following raw materials in parts by weight: 1-5 parts of a water-reducing and dispersing component, 1-5 parts of a setting time adjusting component, 5-20 parts of a pH value adjusting component, 10-40 parts of a reinforcing component, and 30-85 parts of an auxiliary component;

[0008] The preparation method of the auxiliary component is as follows:

[0009] Step S1, dispersing fly ash in deionized water to form a dispersion, heating the dispersion to 60-70° C., then adding fatty alcohol polyoxyethylene ether and zirconium oxide, stirring for 3-4 hours, and obtaining preliminary modified fly ash through post-treatment;

[0010] Step S2: mixing the preliminarily modified fly ash with a silane coupling agent at room temperature, stirring for 1-2 hours, adding nano-silicon dioxide, stirring at 55-65° C. for 2-3 hours, and obtaining modified fly ash through post-treatment;

[0011] Step S3: Evenly mix the mineral powder and the modified fly ash obtained in step S2 to obtain a mixed material; dissolve water glass, sodium hydroxide, and nano-alumina in deionized water to form a composite excitation solution; add the composite excitation solution to the mixed material; and obtain auxiliary components through post-processing.

[0012] Furthermore, the amount of fly ash added to the dispersion in step S1 is 0.1-0.15 g / mL, and the mass ratio of fatty alcohol polyoxyethylene ether, zirconium oxide and fly ash is 0.5-1.5:0.2-0.8:10.

[0013] Furthermore, in step S2, the mass ratio of the preliminary modified fly ash, the silane coupling agent and the nano-silicon dioxide is 1:0.01-0.05:0.01-0.04.

[0014] Furthermore, the mass ratio of the mineral powder in step S3 to the modified fly ash obtained in step S2 is 0.6-2:1, the mass ratio of water glass, sodium hydroxide and nano-alumina is 6-7:2-3:1, the amount of nano-alumina added to the composite excitation liquid is 0.02-0.03 g / mL, and the mass volume ratio of the mixed material to the composite excitation liquid is 1:0.1-0.2 g / mL.

[0015] Furthermore, the preparation method of the water-reducing and dispersing component is as follows: preheating a polycarboxylate water-reducing agent at 40-60° C. for 20-40 minutes, adding sodium lignin sulfonate, stirring for 40-50 minutes, adding a defoaming agent, continuing to stir for 10-20 minutes, and cooling to room temperature to obtain the water-reducing and dispersing component, wherein the mass ratio of the polycarboxylate water-reducing agent, sodium lignin sulfonate, and defoaming agent is 2:0.8-1.2:0.002-0.005.

[0016] Furthermore, the setting time regulating component is obtained by mixing sodium carbonate, collagen and sucrose.

[0017] Furthermore, the pH adjusting component is slaked lime or sodium hydroxide.

[0018] Furthermore, the reinforcing component is obtained by mixing water glass, triethanolamine, triisopropanolamine and a defoaming agent.

[0019] A cementitious material comprises the following raw materials in parts by weight: 18-22 parts of activated gold tailings, 16-20 parts of steel slag, 48-52 parts of slag, 10-14 parts of industrial by-product gypsum, and 3-6 parts of the above-mentioned solid waste-based cementitious material modifier.

[0020] A preparation method of a gelling material comprises the following steps: uniformly mixing activated gold tailings, steel slag, slag and industrial by-product gypsum, then adding a solid waste-based gelling material modifier and uniformly mixing to obtain the gelling material.

[0021] The present invention has the following beneficial effects:

[0022] The present invention provides a solid waste-based cementitious material modifier composed of a composite of organic and inorganic functional materials. First, fly ash is modified by fatty alcohol polyoxyethylene ether and zirconium oxide, then modified by nano-silicon dioxide, and finally mixed with mineral powder and excited by a composite excitation liquid. The prepared auxiliary component synergizes with a water-reducing and dispersing component, a setting time regulating component, a pH regulating component and an enhancing component to significantly improve the performance of the cementitious material. Among them, the auxiliary component plays a vital role in the solid waste-based cementitious material modifier. Through the combination of physical modification and chemical activation, it can significantly improve the compressive strength, flexural strength, fluidity and durability of the cementitious material, and reduce the water demand and setting time; the water-reducing and dispersing component is prepared by polycarboxylic acid water reducer, sodium lignin sulfonate and defoamer in a specific proportion, which can reduce the water demand of standard consistency and improve the fluidity of the slurry; the setting time adjusting component is a mixture of sodium carbonate, collagen and sucrose, which can effectively reduce the setting time and meet the construction standards; the pH value adjusting component uses slaked lime or sodium hydroxide, which can increase the pH value of the pore solution of the slurry and provide an alkaline environment for the early reaction; the reinforcing component is a mixture of water glass, triethanolamine, triisopropanolamine and defoamer, among which water glass stimulates mineral activity to improve early strength, triethanolamine and triisopropanolamine enhance later strength, and the defoamer reduces the air content to improve density. Through the synergistic effect of its components, this modifier can reduce the water requirement and setting time of cementitious materials at standard consistency, optimize the water-binder ratio, and significantly increase fluidity, flexural and compressive strengths, and improve durability. Mortar concrete formulated with this modifier exhibits excellent workability, combines environmental friendliness with engineering practicality, and has broad application prospects. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0024] The raw materials used in the following examples are all common commercially available products. Fly ash with a mesh size of 325, a density of 2.6 g / cm³, and a melting point of 1200°C was purchased from Hebei Leijiang New Materials Technology Co., Ltd.; fatty alcohol polyoxyethylene ether with an effective ingredient content of 99% and an HLB value of 12.5 was purchased from Shandong Yihui Chemical Co., Ltd.; zirconium oxide with a mesh size of 300 and an effective ingredient content of 99% was purchased from Qinghe Chaotai Metal Materials Co., Ltd.; silane coupling agent was silane coupling agent KH-550; nano-silica was TSP-H10 with a particle size of 20 nm and a silicon dioxide content of 99%, purchased from Nanjing Tianxing New Materials Co., Ltd.; water glass with an effective ingredient content of 40% was model SS-006. , purchased from Jinan Songsheng New Materials Co., Ltd.; nano alumina particle size 50nm, active ingredient content of 99.99%, purchased from Hebei Wenlun Metal Materials Co., Ltd.; polycarboxylic acid water reducer active ingredient content of 99%, water reduction rate of 40%, purchased from Jinan Yanglan New Materials Technology Co., Ltd.; sodium lignin sulfonate active ingredient content of 99%, purchased from Shandong Yihui Chemical Co., Ltd.; defoamer with an active substance content of 90%, is an organosilicon defoamer, model AK-012, purchased from Shandong Aokai Chemical Co., Ltd.; collagen active ingredient content of 99%, the main raw material is collagen, purchased from Henan Jiqian Biotechnology Co., Ltd.

[0025] Example 1

[0026] A solid waste-based gelling material modifier, comprising the following raw materials in parts by weight: 1 part of a water-reducing and dispersing component, 1 part of a setting time regulating component, 5 parts of a pH regulating component, 10 parts of a reinforcing component, and 30 parts of an auxiliary component;

[0027] The setting time regulating component is a mixture of sodium carbonate, collagen, and sucrose in a mass ratio of 3:1:1; the pH value regulating component is slaked lime; and the enhancing component is a mixture of water glass, triethanolamine, triisopropanolamine, and defoaming agent in a mass ratio of 1000:40:20:1.

[0028] The preparation method of the auxiliary component is as follows:

[0029] Step S1, dispersing fly ash in deionized water to form a dispersion, heating the dispersion to 65° C., then adding fatty alcohol polyoxyethylene ether and zirconium oxide, stirring for 3.5 hours, and then spray drying under the conditions of an inlet air temperature of 180° C. and an outlet air temperature of 100° C. to obtain preliminary modified fly ash, wherein the amount of fly ash added to the dispersion is 0.12 g / mL, and the mass ratio of fatty alcohol polyoxyethylene ether, zirconium oxide to fly ash is 1:0.6:10;

[0030] Step S2, at room temperature, mixing the preliminary modified fly ash with a silane coupling agent, stirring for 1.5 hours, then adding nano-silica, stirring at 60° C. for 2.5 hours, and then vacuum drying at 100° C. to constant weight, selecting zirconia balls, with a grinding ball size ratio of 10 mm: 5 mm: 3 mm = 3:5:2, a ball-to-material ratio of 8:1, and a rotation speed of 400 rpm, and ball milling for 3 hours to obtain modified fly ash, wherein the mass ratio of the preliminary modified fly ash, the silane coupling agent, and the nano-silica is 1:0.03:0.02;

[0031] Step S3, the mineral powder and the modified fly ash are mixed evenly, water glass, sodium hydroxide, and nano alumina are dissolved in deionized water to form a composite excitation solution, and the composite excitation solution is sprayed into the mixed material at a spray rate of 0.5 L / min, and zirconium oxide balls are selected, the grinding ball size ratio is 10 mm: 5 mm: 3 mm = 3:5:2, the ball-to-material ratio is 8:1, the rotation speed is 350 rpm, and the ball milling is carried out for 2 hours, and then cured in a constant temperature box at 60 ° C for 3 hours, and then vacuum dried at 100 ° C to constant weight to obtain an auxiliary component, wherein the mass ratio of mineral powder to modified fly ash is 1:1, the mass ratio of water glass, sodium hydroxide, and nano alumina is 6.5:2.5:1, the amount of nano alumina added to the composite excitation solution is 0.025 g / mL, and the mass volume ratio of the mixed material to the composite excitation solution is 1:0.15 g / mL.

[0032] The preparation method of the water-reducing and dispersing component comprises preheating a polycarboxylate water-reducing agent at 50° C. for 30 minutes, adding sodium lignin sulfonate, stirring for 45 minutes, adding a defoamer, continuing to stir for 15 minutes, and cooling to room temperature to obtain the water-reducing and dispersing component. The mass ratio of the polycarboxylate water-reducing agent, the sodium lignin sulfonate, and the defoamer is 2:1:0.004.

[0033] A cementitious material comprises the following raw materials in parts by weight: 18 parts of activated gold tailings, 16 parts of steel slag, 48 parts of slag, 10 parts of industrial by-product gypsum, and 3 parts of the above-mentioned solid waste-based cementitious material modifier.

[0034] A method for preparing a gelling material comprises the following steps: uniformly mixing activated gold tailings, steel slag, slag and industrial by-product gypsum, adding a solid waste-based gelling material modifier, and mixing for 15 minutes to obtain the gelling material.

[0035] Example 2

[0036] A solid waste-based gelling material modifier, comprising the following raw materials in parts by weight: 5 parts of a water-reducing and dispersing component, 5 parts of a setting time regulating component, 20 parts of a pH regulating component, 40 parts of a reinforcing component, and 85 parts of an auxiliary component;

[0037] The setting time regulating component and the enhancing component are the same as those in Example 1; the pH regulating component is sodium hydroxide;

[0038] The preparation method of the auxiliary component and the preparation method of the water-reducing and dispersing component are the same as those in Example 1.

[0039] A cementitious material comprises the following raw materials in parts by weight: 22 parts of activated gold tailings, 20 parts of steel slag, 52 parts of slag, 14 parts of industrial by-product gypsum, and 6 parts of the above-mentioned solid waste-based cementitious material modifier.

[0040] A method for preparing a gelling material comprises the following steps: uniformly mixing activated gold tailings, steel slag, slag and industrial by-product gypsum, then adding a solid waste-based gelling material modifier and mixing for 20 minutes to obtain the gelling material.

[0041] Example 3

[0042] A solid waste-based gelling material modifier, comprising the following raw materials in parts by weight: 3 parts of a water-reducing and dispersing component, 2 parts of a setting time regulating component, 10 parts of a pH regulating component, 30 parts of a reinforcing component, and 50 parts of an auxiliary component;

[0043] The setting time regulating component, pH regulating component and enhancing component are the same as those in Example 1;

[0044] The preparation method of the auxiliary component and the preparation method of the water-reducing and dispersing component are the same as those in Example 1.

[0045] A cementitious material comprises the following raw materials in parts by weight: 20 parts of activated gold tailings, 18 parts of steel slag, 50 parts of slag, 12 parts of industrial by-product gypsum, and 4 parts of the above-mentioned solid waste-based cementitious material modifier.

[0046] A method for preparing a cementitious material comprises the following steps: uniformly mixing activated gold tailings, steel slag, slag and industrial by-product gypsum, adding a solid waste-based cementitious material modifier, and mixing for 18 minutes to obtain the cementitious material.

[0047] Example 4

[0048] A solid waste-based gelling material modifier, comprising the following raw materials in parts by weight: 3 parts of a water-reducing and dispersing component, 2 parts of a setting time regulating component, 10 parts of a pH regulating component, 30 parts of a reinforcing component, and 50 parts of an auxiliary component;

[0049] The setting time regulating component, pH regulating component and enhancing component are the same as those in Example 1;

[0050] The preparation method of the auxiliary component is as follows:

[0051] Step S1, dispersing fly ash in deionized water to form a dispersion, heating the dispersion to 70° C., then adding fatty alcohol polyoxyethylene ether and zirconium oxide, stirring for 4 hours, and then spray drying under the conditions of an inlet air temperature of 180° C. and an outlet air temperature of 100° C. to obtain preliminary modified fly ash, wherein the amount of fly ash added to the dispersion is 0.15 g / mL, and the mass ratio of fatty alcohol polyoxyethylene ether, zirconium oxide to fly ash is 1.5:0.8:10;

[0052] Step S2, at room temperature, mixing the preliminary modified fly ash with a silane coupling agent, stirring for 2 hours, then adding nano-silica, stirring at 65° C. for 3 hours, and then vacuum drying at 100° C. to constant weight, selecting zirconia balls, with a grinding ball size ratio of 10 mm: 5 mm: 3 mm = 3:5:2, a ball-to-material ratio of 8:1, and a rotation speed of 400 rpm, and ball milling for 3 hours to obtain modified fly ash, wherein the mass ratio of the preliminary modified fly ash, silane coupling agent, and nano-silica is 1:0.05:0.04;

[0053] Step S3, mix the mineral powder and modified fly ash evenly, dissolve water glass, sodium hydroxide, and nano alumina in deionized water to form a composite excitation solution, spray the composite excitation solution into the mixed material at a spray rate of 0.5 L / min, and then select zirconia balls, the grinding ball size ratio is 10 mm: 5 mm: 3 mm = 3:5:2, the ball-to-material ratio is 8:1, the rotation speed is 350 rpm, ball milling is carried out for 2 hours, and then cured in a constant temperature box at 60 ° C for 3 hours, and then vacuum dried at 100 ° C to constant weight to obtain an auxiliary component, wherein the mass ratio of mineral powder to modified fly ash is 2:1, the mass ratio of water glass, sodium hydroxide, and nano alumina is 7:3:1, the amount of nano alumina added to the composite excitation solution is 0.03 g / mL, and the mass volume ratio of the mixed material to the composite excitation solution is 1:0.2 g / mL.

[0054] The preparation method of the water-reducing and dispersing component comprises preheating a polycarboxylate water-reducing agent at 60° C. for 40 minutes, adding sodium lignin sulfonate, stirring for 50 minutes, adding a defoamer, continuing to stir for 20 minutes, and cooling to room temperature to obtain the water-reducing and dispersing component. The mass ratio of the polycarboxylate water-reducing agent, the sodium lignin sulfonate, and the defoamer is 2:1.2:0.005.

[0055] A cementitious material comprises the following raw materials in parts by weight: 20 parts of activated gold tailings, 18 parts of steel slag, 50 parts of slag, 12 parts of industrial by-product gypsum, and 4 parts of the above-mentioned solid waste-based cementitious material modifier.

[0056] A method for preparing a cementitious material comprises the following steps: uniformly mixing activated gold tailings, steel slag, slag and industrial by-product gypsum, adding a solid waste-based cementitious material modifier, and mixing for 18 minutes to obtain the cementitious material.

[0057] Comparative Example 1

[0058] A solid waste-based gelling material modifier, comprising the following raw materials in parts by weight: 0.1 parts of a water-reducing and dispersing component, 2 parts of a setting time regulating component, 5 parts of a pH regulating component, 30 parts of a reinforcing component, and 5 parts of an auxiliary component;

[0059] The setting time regulating component, pH regulating component and enhancing component are the same as those in Example 1;

[0060] The preparation method of the auxiliary component and the preparation method of the water-reducing and dispersing component are the same as those in Example 1.

[0061] A cementitious material comprises the following raw materials in parts by weight: 20 parts of activated gold tailings, 18 parts of steel slag, 50 parts of slag, 12 parts of industrial by-product gypsum, and 1 part of the above-mentioned solid waste-based cementitious material modifier.

[0062] A method for preparing a gelling material comprises the following steps: uniformly mixing activated gold tailings, steel slag, slag and industrial by-product gypsum, adding a solid waste-based gelling material modifier, and mixing for 10 minutes to obtain the gelling material.

[0063] Comparative Example 2

[0064] A solid waste-based gelling material modifier, comprising the following raw materials in parts by weight: 3 parts of a water-reducing and dispersing component, 2 parts of a setting time regulating component, 10 parts of a pH regulating component, 30 parts of a reinforcing component, and 50 parts of an auxiliary component;

[0065] The setting time regulating component, pH regulating component and enhancing component are the same as those in Example 1;

[0066] The preparation method of the auxiliary component is as follows:

[0067] Step S1, dispersing fly ash in deionized water to form a dispersion, heating the dispersion to 65° C., then adding fatty alcohol polyoxyethylene ether and zirconium oxide, stirring for 3.5 hours, and then spray drying under the conditions of an inlet air temperature of 180° C. and an outlet air temperature of 100° C. to obtain preliminary modified fly ash, wherein the amount of fly ash added to the dispersion is 0.12 g / mL, and the mass ratio of fatty alcohol polyoxyethylene ether, zirconium oxide to fly ash is 1:0.6:10;

[0068] Step S2, at room temperature, mixing the preliminarily modified fly ash with a silane coupling agent, stirring for 1.5 hours, then adding nano-silica, stirring at 60° C. for 2.5 hours, and then vacuum drying at 100° C. to constant weight, selecting zirconia balls with a grinding ball size ratio of 10 mm:5 mm:3 mm=3:5:2, a ball-to-material ratio of 8:1, and a rotation speed of 400 rpm, and ball milling for 3 hours to obtain an auxiliary component, wherein the mass ratio of the preliminarily modified fly ash, the silane coupling agent, and the nano-silica is 1:0.03:0.02;

[0069] The preparation method of the water-reducing and dispersing component comprises preheating a polycarboxylate water-reducing agent at 50° C. for 30 minutes, adding sodium lignin sulfonate, stirring for 45 minutes, adding a defoamer, continuing to stir for 15 minutes, and cooling to room temperature to obtain the water-reducing and dispersing component. The mass ratio of the polycarboxylate water-reducing agent, the sodium lignin sulfonate, and the defoamer is 2:1:0.004.

[0070] A cementitious material comprises the following raw materials in parts by weight: 20 parts of activated gold tailings, 18 parts of steel slag, 50 parts of slag, 12 parts of industrial by-product gypsum, and 4 parts of the above-mentioned solid waste-based cementitious material modifier.

[0071] A method for preparing a cementitious material comprises the following steps: uniformly mixing activated gold tailings, steel slag, slag and industrial by-product gypsum, adding a solid waste-based cementitious material modifier, and mixing for 18 minutes to obtain the cementitious material.

[0072] Comparative Example 3

[0073] A solid waste-based gelling material modifier, comprising the following raw materials in parts by weight: 3 parts of a water-reducing and dispersing component, 2 parts of a setting time regulating component, 10 parts of a pH regulating component, 30 parts of a reinforcing component, and 50 parts of an auxiliary component;

[0074] The setting time regulating component, pH regulating component and enhancing component are the same as those in Example 1;

[0075] The auxiliary component is prepared by dispersing fly ash in deionized water to form a dispersion, heating the dispersion to 65° C., then adding fatty alcohol polyoxyethylene ether and zirconium oxide, stirring for 3.5 hours, and then spray drying under the conditions of an inlet air temperature of 180° C. and an outlet air temperature of 100° C. to obtain the auxiliary component, wherein the amount of fly ash added to the dispersion is 0.12 g / mL, and the mass ratio of fatty alcohol polyoxyethylene ether, zirconium oxide to fly ash is 1:0.6:10;

[0076] The preparation method of the water-reducing and dispersing component comprises preheating a polycarboxylate water-reducing agent at 50° C. for 30 minutes, adding sodium lignin sulfonate, stirring for 45 minutes, adding a defoamer, continuing to stir for 15 minutes, and cooling to room temperature to obtain the water-reducing and dispersing component. The mass ratio of the polycarboxylate water-reducing agent, the sodium lignin sulfonate, and the defoamer is 2:1:0.004.

[0077] A cementitious material comprises the following raw materials in parts by weight: 20 parts of activated gold tailings, 18 parts of steel slag, 50 parts of slag, 12 parts of industrial by-product gypsum, and 4 parts of the above-mentioned solid waste-based cementitious material modifier.

[0078] A method for preparing a cementitious material comprises the following steps: uniformly mixing activated gold tailings, steel slag, slag and industrial by-product gypsum, adding a solid waste-based cementitious material modifier, and mixing for 18 minutes to obtain the cementitious material.

[0079] Comparative Example 4

[0080] A solid waste-based gelling material modifier, comprising the following raw materials in parts by weight: 3 parts of a water-reducing and dispersing component, 2 parts of a setting time regulating component, 10 parts of a pH regulating component, 30 parts of a reinforcing component, and 50 parts of an auxiliary component;

[0081] The setting time regulating component, pH regulating component and enhancing component are the same as those in Example 1;

[0082] The auxiliary component is fly ash; and the water-reducing and dispersing component is a polycarboxylic acid water-reducing agent.

[0083] A cementitious material comprises the following raw materials in parts by weight: 20 parts of activated gold tailings, 18 parts of steel slag, 50 parts of slag, 12 parts of industrial by-product gypsum, and 4 parts of the above-mentioned solid waste-based cementitious material modifier.

[0084] A method for preparing a cementitious material comprises the following steps: uniformly mixing activated gold tailings, steel slag, slag and industrial by-product gypsum, adding a solid waste-based cementitious material modifier, and mixing for 18 minutes to obtain the cementitious material.

[0085] Table 1 Main chemical composition of raw materials (w%)

[0086]

[0087] Table 2 Physical properties of raw materials

[0088]

[0089] Tables 1 and 2 show the main chemical compositions and physical properties of raw materials such as activated gold tailings, steel slag, slag, and industrial by-product gypsum used to prepare cementitious materials.

[0090] Performance testing:

[0091] The standard consistency water requirement, setting time, and stability of each sample were measured in accordance with the standard GB / T 1346-2024 “Test method for water requirement, setting time, and stability of cement at standard consistency”. The results are shown in Table 3, where the baseline all-solid waste sample refers to the cementitious material without the addition of a waste-based cementitious material modifier.

[0092] The W / B ratio and fluidity were determined according to GB / T 8077-2023 Test method for homogeneity of concrete admixtures, with a water content of 87 g. Samples were prepared and cured according to GB / T 17671-2021 Test method for strength of cement mortar (ISO method), and the flexural and compressive strengths of the samples were determined. The results are shown in Table 4.

[0093] The slump of concrete using the cementitious material prepared by the present invention as one of the raw materials was measured according to GB / T 50080-2016 “Standard for Test Methods for Performance of Ordinary Concrete Mixtures”; the compressive strength of concrete was measured according to GB / T 50081-2019 “Standard for Test Methods for Physical and Mechanical Properties of Concrete”. The results are shown in Table 5.

[0094] Table 3 Water requirement, setting time and stability of standard consistency

[0095]

[0096] Table 4 Physical properties of cementitious materials

[0097]

[0098] As can be seen from Tables 3 and 4, the standard consistency water requirement, setting time, stability and W / B water-cement ratio, fluidity, flexural strength, compressive strength and other properties of the cementitious materials prepared in Examples 1-4 are all better than those in Comparative Example 1, and are close to the performance parameters of P.O42.5 cement. Therefore, it can be shown that the ratio for preparing cementitious materials proposed in the present invention is the best and meets the standard requirements of general silicate cement. As can be seen from the data in Tables 3 and 4, the various properties of the cementitious materials prepared in Comparative Example 2 have all declined, indicating that the performance improvement effect of the solid waste-based cementitious material modifier prepared in Comparative Example 2 is not good. When preparing the solid waste-based cementitious material modifier of Comparative Example 2, the process of compounding the modified fly ash with mineral powder and then treating it with a composite excitation liquid is missing. In this process, spraying the composite excitation liquid can effectively promote the hydration reaction of the mineral powder, etc., accelerate the setting speed of the cementitious material, and shorten the setting time. In addition, the components such as water glass and sodium hydroxide in the composite excitation liquid can affect the hydration behavior of the mixture, thereby adjusting the cementitious material in water. The water demand in the cementitious process is increased. The nano-alumina in the composite stimulating liquid has good dispersibility and surface activity, and can react with the alumina, silica and other components in the mineral powder and modified fly ash to form a smaller and more uniform crystal structure. This structure helps to improve the density and impermeability of the material, thereby enhancing the durability of the cementitious material. The introduction of nano-alumina can also reduce the porosity in the material and improve the flexural and compressive strength of the cementitious material. The sodium hydroxide and water glass in the composite stimulating liquid can adjust the pH value of the material, so that the cementitious material maintains good workability and fluidity during the construction process.

[0099] It can be seen from the data in Tables 3 and 4 that the standard consistency water requirement, setting time, stability and physical properties of the cementitious material prepared in Comparative Example 3 are reduced again, indicating that the performance improvement effect of the solid waste-based cementitious material modifier prepared in this comparative example is reduced again. In the preparation of the solid waste-based cementitious material modifier, Comparative Example 3 not only lacks the process of compounding the modified fly ash with the mineral powder and then treating it with the composite excitation liquid, but also lacks the nano-silica modification process. In the nano-silica modification process, the silane coupling agent and nano-silica are used to improve the activity of the fly ash, promote the hydration reaction, and shorten the setting time of the gel material. The introduction of the silane coupling agent can also reduce the surface energy of the fly ash particles, reduce agglomeration, and improve the dispersibility of the fly ash in the cementitious material, thereby improving the fluidity of the slurry and reducing the water demand of the cementitious material. Nano-silica is grafted onto the surface of fly ash through the organic chain segments of the silane coupling agent, filling the surface micro-cracks and improving the density of the cementitious material. At the same time, the introduction of the silane coupling agent and nano-silica can promote the hydration reaction and generate more cementitious substances, thereby improving the compressive and flexural strength of the cementitious material.

[0100] From the data in Tables 3 and 4, it can be seen that the standard consistency water requirement, setting time, stability and physical property data of the cementitious material prepared in Comparative Example 4 are the lowest, indicating that the performance improvement effect of the solid waste-based cementitious material modifier prepared in this comparative example is the worst. When preparing the solid waste-based cementitious material modifier of Comparative Example 3, the auxiliary component is fly ash and the water-reducing and dispersing component is polycarboxylic acid water-reducing agent, both of which lack the modified part. The introduction of fatty alcohol polyoxyethylene ether in the modification process of the auxiliary component can improve the surface properties of the fly ash and reduce the agglomeration phenomenon between the particles. In the modification process of the water-reducing and dispersing component, the polycarboxylic acid water-reducing agent and sodium lignin sulfonate can also be modified by electrostatic repulsion. The mechanical and spatial steric effects can reduce particle agglomeration, and the two can work together to improve the fluidity and stability of the cementitious material. During the modification of the auxiliary components, zirconium oxide can be used as a nano-scale filler to fill the micropores on the surface of the fly ash, reduce the water absorption rate, and work together with the modified water-reducing and dispersing components to reduce the water demand of the cementitious material. The addition of zirconium oxide can further increase the surface activity of the fly ash, making it easier to react chemically with other components, thereby enhancing its role in the cementitious material and enabling the fly ash to participate more effectively in the subsequent hydration reaction to generate more cementitious substances, thereby improving the strength of the cementitious material and reducing the setting time.

[0101] Table 5 Comparison of concrete properties

[0102]

[0103] Sample 1 in Table 5 uses a benchmark solid waste for concrete performance testing, while Sample 2 uses the cementitious material prepared in Example 4 for concrete performance testing. The water consumption, slump, and mechanical properties of the two cementitious materials during application are compared. As can be seen from the data in Table 5, the cementitious material prepared in Example 4 of the present invention can achieve the same slump as cement with the same water consumption per cubic meter of concrete. Although the 7-day strength is slightly lower, the 28-day strength is better than cement. In addition, compared with Sample 1, Sample 2 reduces the amount of water reducer by 25% and the water consumption by 10 kg. The introduction of the solid waste-based cementitious material prepared in Example 4 not only improves the early strength of the concrete, with the 7-day strength increased by more than 40% and the 28-day strength increased by 20%, but also effectively improves the slump performance. Overall, the concrete prepared with the cementitious material that introduces the solid waste-based cementitious material modifier is comparable to PO 42.5 cement in terms of physical and mechanical properties.

[0104] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A solid waste-based gelling material modifier, characterized in that: The composition comprises the following raw materials in parts by weight: 1-5 parts of a water-reducing and dispersing component, 1-5 parts of a setting time adjusting component, 5-20 parts of a pH adjusting component, 10-40 parts of a reinforcing component, and 30-85 parts of an auxiliary component; The preparation method of the auxiliary component is as follows: Step S1, dispersing fly ash in deionized water to form a dispersion, heating the dispersion to 60-70° C., then adding fatty alcohol polyoxyethylene ether and zirconium oxide, stirring for 3.5 hours, and obtaining preliminary modified fly ash through post-treatment; Step S2: mixing the preliminarily modified fly ash with a silane coupling agent at room temperature, stirring for 1-2 hours, adding nano-silicon dioxide, stirring at 55-65° C. for 2-3 hours, and obtaining modified fly ash through post-treatment; Step S3: uniformly mixing the mineral powder and the modified fly ash obtained in step S2 to obtain a mixed material; dissolving water glass, sodium hydroxide, and nano-alumina in deionized water to form a composite excitation solution; adding the composite excitation solution to the mixed material; and post-processing to obtain an auxiliary component; The amount of fly ash added to the dispersion in step S1 is 0.1-0.15 g / mL, and the mass ratio of fatty alcohol polyoxyethylene ether, zirconium oxide and fly ash is 0.5-1.5:0.2-0.8:10; The mass ratio of the preliminary modified fly ash, silane coupling agent and nano-silicon dioxide in step S2 is 1:0.01-0.05:0.01-0.04; The mass ratio of the mineral powder in step S3 to the modified fly ash obtained in step S2 is 0.6-2:1, the mass ratio of water glass, sodium hydroxide, and nano-alumina is 6-7:2-3:1, the amount of nano-alumina added to the composite excitation solution is 0.02-0.03 g / mL, and the mass volume ratio of the mixed material to the composite excitation solution is 1:0.1-0.2 g / mL; The preparation method of the water-reducing and dispersing component comprises: preheating a polycarboxylate water-reducing agent at 40-60° C. for 20-40 minutes, adding sodium lignin sulfonate, stirring for 40-50 minutes, adding a defoamer, continuing to stir for 10-20 minutes, and cooling to room temperature to obtain the water-reducing and dispersing component, wherein the mass ratio of the polycarboxylate water-reducing agent, sodium lignin sulfonate, and defoamer is 2:0.8-1.2:0.002-0.

005.

2. The solid waste-based gelling material modifier according to claim 1, characterized in that: The coagulation time regulating component is obtained by mixing sodium carbonate, collagen and sucrose.

3. The solid waste-based gelling material modifier according to claim 1, characterized in that: The pH value adjusting component is slaked lime or sodium hydroxide.

4. The solid waste-based gelling material modifier according to claim 1, characterized in that: The reinforcing component is obtained by mixing water glass, triethanolamine, triisopropanolamine and a defoaming agent.

5. A gelling material, characterized in that: The method comprises the following raw materials in parts by weight: 18-22 parts of activated gold tailings, 16-20 parts of steel slag, 48-52 parts of slag, 10-14 parts of industrial by-product gypsum, and 3-6 parts of the solid waste-based gelling material modifier according to any one of claims 1 to 4.

6. The method for preparing a gelling material according to claim 5, characterized in that: The following steps are involved: The activated gold tailings, steel slag, slag and industrial by-product gypsum are mixed evenly, and then a solid waste-based gelling material modifier is added and mixed evenly to obtain the product.

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