Artificial aggregate and preparation method thereof

Abstract

The present application relates to the field of solid waste recycling technology and provides an artificial aggregate and a preparation method thereof. The preparation method comprises: the present application provides a method for preparing an artificial aggregate, comprising: mixing and molding a calcium-containing substance, an alkaline activator, and water according to a first preset composition to obtain an artificial aggregate core; wherein the particle size of the artificial aggregate core is within a preset range; forming an artificial aggregate shell on the surface of the artificial aggregate core according to a second preset composition of the calcium-containing substance, an alkaline activator, and water to obtain a pre-product; and curing and drying the pre-product to obtain an artificial aggregate. The above solution solves the problem of ineffective repair of concrete cracks.

Description

Technical Field

[0001] The present application belongs to the technical field of solid waste recycling, and in particular relates to an artificial aggregate and a preparation method thereof. Background Art

[0002] Concrete is currently the most widely used building material. It has many advantages, such as low energy consumption, low cost, good plasticity, and local availability. However, due to the composition and load-bearing properties of concrete, it often contains some tiny initial cracks. With changes in load and the erosion of the external environment, these tiny cracks easily expand and cause cracks on the surface and the entire concrete, accelerating the deterioration and morphological changes of the concrete structure, seriously affecting its durability. Traditional concrete maintenance methods are designed to extend the service life of concrete, but due to the high cost of maintenance and limitations such as the location and size of the cracks, traditional maintenance methods are often ineffective. Therefore, the existing technology still has the problem of being unable to effectively repair concrete cracks, which needs to be solved urgently. Summary of the Invention

[0003] The purpose of this application is to provide an artificial aggregate and a preparation method thereof, aiming to solve the problem that concrete cracks cannot be effectively repaired.

[0004] To achieve the above application objectives, the technical solutions adopted in this application are as follows:

[0005] In a first aspect, the present application provides a method for preparing an artificial aggregate, comprising:

[0006] The calcium-containing substance and the alkaline activator are mixed and molded according to a preset ratio to obtain an artificial aggregate core; the preset ratio is the molar ratio of calcium element to alkali ion, and the preset ratio is higher than the molar ratio of calcium element to alkali ion when the alkaline activator reacts completely;

[0007] mixing a calcium-containing substance and an alkaline activator and coating the mixture on the surface of the artificial aggregate core to obtain a pre-product;

[0008] The pre-product is cured and dried to obtain artificial aggregate.

[0009] Preferably, the calcium-containing substance is solid, and the mixing and molding of the calcium-containing substance and the alkaline activator according to a preset ratio comprises:

[0010] The solid calcium-containing substance and the alkaline activator are placed in a granulation device according to the preset ratio, a set amount of water is added, and the reaction is performed to form a granular product;

[0011] The granulated product is dried to obtain an artificial aggregate core.

[0012] Preferably, the calcium-containing substance and the alkaline activator are mixed and molded according to a preset ratio to obtain the artificial aggregate core, comprising:

[0013] Mixing the calcium-containing substance and the alkaline activator according to the preset ratio and pouring the mixture to obtain a building block;

[0014] Crushing the building blocks to obtain a first preprocessed product;

[0015] The first pretreated product is dried to obtain an artificial aggregate core.

[0016] Preferably, the calcium-containing substance and the alkaline activator are mixed and then coated on the surface of the artificial aggregate core to obtain a pre-product, comprising:

[0017] Mixing the calcium-containing substance and the alkaline stimulator into a slurry according to another preset ratio;

[0018] soaking the artificial aggregate core in the slurry and then taking it out to obtain a second pretreated product;

[0019] The second pretreated product is dried to solidify the slurry on the surface of the artificial aggregate inner core to form an artificial aggregate outer shell, thereby obtaining a pre-product.

[0020] Preferably, the calcium-containing substance is solid, and the calcium-containing substance and the alkaline activator are mixed and coated on the surface of the artificial aggregate core to obtain a pre-product, comprising:

[0021] Mixing the solid calcium-containing substance and the alkaline activator according to another preset ratio to form a mixture;

[0022] The artificial aggregate core and the mixed material are placed in a granulation device, and a set amount of water is added to react and form the artificial aggregate core so that the artificial aggregate shell wraps the artificial aggregate core to obtain a pre-product.

[0023] Preferably, the curing and drying of the pre-product to obtain the artificial aggregate comprises:

[0024] The pre-product is placed in a room with a temperature of 18 to 22° C. and a humidity greater than 95% for curing;

[0025] The cured pre-product is dried at a temperature greater than 50° C. for 6 to 24 hours to obtain an artificial aggregate.

[0026] Preferably, the calcium-containing substance includes a high-calcium substance and a low-calcium substance, the calcium oxide content of the high-calcium substance is greater than 10 wt %, and the calcium oxide content of the low-calcium substance is less than 10 wt %.

[0027] Preferably, the high-calcium material includes at least one of waste lime, steel slag, slag, bottom ash, waste incineration fly ash, and rice ash;

[0028] And / or, the low-calcium material includes at least one of fly ash, metakaolin, volcanic ash, and red mud.

[0029] Preferably, the alkaline activator includes at least one of sodium metasilicate, sodium carbonate and sodium hydroxide.

[0030] In a second aspect, the present application provides an artificial aggregate, which is prepared by the method described in any one of the first aspects above.

[0031] Beneficial effects of this application

[0032] The present application provides a method for preparing an artificial aggregate. The artificial aggregate obtained according to the preparation method can be used as one of the components of concrete. The preparation method includes mixing and molding a calcium-containing substance and an alkaline activator according to a preset ratio to obtain an artificial aggregate core. The preset ratio is the molar ratio of calcium element to alkali ion, and is higher than the molar ratio of calcium element to alkali ion when the alkaline activator is completely reacted. Therefore, in the present application, the artificial aggregate core formed by configuring the various raw materials according to the preset ratio contains a large amount of unreacted calcium-containing substances. When cracks occur, these calcium-containing substances will react with the alkaline ions in the internal environment of the concrete, and the reaction products will accumulate between the cracks, thereby achieving effective repair of the cracks. The repair effect is not limited by factors such as the location and size of the cracks. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0034] Figure 1 This is a flow chart of a method for preparing artificial aggregate provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] For ease of description, the descriptions of "first", "second", etc. in the present invention are provided for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. Some or all of the steps can be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0038] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0039] The weights of the relevant components mentioned in the examples of this application may not only refer to the specific content of each component, but also represent the weight ratio between the components. Therefore, as long as the content of the relevant components is proportionally enlarged or reduced according to the examples of this application, it is within the scope disclosed in the examples of this application. Specifically, the mass described in the examples of this application may be a mass unit known in the chemical industry, such as μg, mg, g, kg, etc.

[0040] As a widely used building material, concrete has many advantages such as low energy consumption, low cost, good plasticity and local availability. However, due to the characteristics of concrete, it often has some tiny initial cracks. With the influence of load changes and external environmental erosion, these tiny cracks easily expand and cause more serious cracks on the surface and overall concrete, accelerating the deterioration and morphological changes of the concrete structure, and seriously affecting its durability. In order to extend the service life of concrete, traditional maintenance methods are adopted, but due to the high cost of maintenance and limiting factors such as the location and size of the cracks, traditional methods often cannot work effectively. In this regard, the present application proposes an artificial aggregate and a preparation method thereof.

[0041] Figure 1 A flow chart showing a method for preparing an artificial aggregate provided in an embodiment of the present application is shown. Figure 1The present invention provides a method for preparing an artificial aggregate, comprising the following steps:

[0042] Step S100: mixing and molding a calcium-containing substance and an alkaline activator according to a preset ratio to obtain an artificial aggregate core; the preset ratio is a molar ratio of calcium element to alkali ion, and the preset ratio is higher than the molar ratio of calcium element to alkali ion when the alkaline activator reacts completely;

[0043] Step S101: mixing a calcium-containing substance and an alkaline activator and coating the mixture on the surface of the artificial aggregate core to obtain a pre-product;

[0044] Step S102: curing and drying the pre-product to obtain artificial aggregate.

[0045] Among them, calcium-containing substances can be solid wastes containing calcium elements, the main components of which are substances containing calcium compounds. Calcium-containing substances usually come from industrial production, construction and demolition, metallurgical processes or consumer product waste, etc. Common calcium-containing substances include: 1) Limestone waste slag: limestone is an ore containing a large amount of calcium carbonate. Its mining and processing process will produce corresponding waste slag, such as excavation waste slag from limestone deposits; 2) Cement manufacturing waste: some wastes generated in the cement production process, such as slag, gypsum, coal gangue, etc., whose main components include calcium compounds and silicates, etc.; 3) Gypsum waste: gypsum is an ore containing a large amount of calcium sulfate, which is used in building materials, medicine, agriculture and other fields. Its production process will produce gypsum waste; 4) Ore waste: some ore processing processes will produce calcium-containing solid waste, such as limestone, dolomite, etc.

[0046] The calcium-containing substance may also be a solid reagent or liquid reagent containing calcium, such as calcium chloride solution.

[0047] Among them, the alkaline activator refers to a substance that enhances the alkaline conditions in a chemical reaction and can provide hydroxide ions or other alkaline ions.

[0048] Exemplarily, in a preferred embodiment of the present application, the alkaline activator includes at least one of sodium metasilicate, sodium carbonate, and sodium hydroxide.

[0049] The particle size of the artificial aggregate core should be within a preset range. In a preferred embodiment of the present application, the preset range is 0.5 to 20 mm.

[0050] It should be noted that, in the calcium-containing substance and alkaline activator required for manufacturing the core of the artificial aggregate, the molar ratio of calcium element to alkali ion is 1:1 to 4:1.

[0051] Exemplarily, limestone waste residue and sodium hydroxide are mixed and molded according to a preset ratio to obtain an artificial aggregate core, wherein the preset ratio is higher than the molar ratio of calcium element to alkali ion when the alkaline activator reacts completely, and the particle size of the artificial aggregate core is within the range of 0.5 to 20 mm; the limestone waste residue and sodium hydroxide are mixed and coated on the surface of the artificial aggregate core to obtain a pre-product; and the pre-product is cured and dried to obtain the artificial aggregate.

[0052] It should be noted that after the limestone waste residue and sodium hydroxide are mixed, an artificial aggregate shell is formed on the surface of the artificial aggregate core. The artificial aggregate core is wrapped in the artificial aggregate shell, and the two are combined to form the artificial aggregate.

[0053] It should be noted that, in the calcium-containing substance and alkaline activator required for manufacturing the outer core of the artificial aggregate, the molar ratio of calcium element to alkali ion is 1:1 to 5.5:1.

[0054] In a preferred embodiment of the present application, the calcium-containing substance includes a high-calcium substance and a low-calcium substance, wherein the calcium oxide content of the high-calcium substance is greater than 10 wt %, and the calcium oxide content of the low-calcium substance is less than 10 wt %.

[0055] The high-calcium substance may be high-calcium solid waste, and the low-calcium substance may be low-calcium solid waste.

[0056] It should be noted that high-calcium solid waste includes at least one of waste lime, steel slag, slag, bottom ash, waste incineration fly ash, and rice ash.

[0057] It should be noted that the low-calcium solid waste includes at least one of fly ash, metakaolin, volcanic ash, and red mud.

[0058] In a preferred embodiment of the present application, the raw materials for preparing the artificial aggregate can also be configured in parts by weight. Correspondingly, the configuration components of the artificial aggregate core are: 10 to 30 parts of high-calcium solid waste, 70 to 90 parts of low-calcium solid waste, 1 to 10 parts of alkaline activator and 10 to 50 parts of water.

[0059] For example, the components of the artificial aggregate core are: 10 parts of high-calcium solid waste, 90 parts of low-calcium solid waste, 6 parts of alkaline activator and 20 parts of water.

[0060] For example, the artificial aggregate core is composed of 15 parts of high-calcium solid waste, 85 parts of low-calcium solid waste, 6 parts of alkaline activator, and 20 parts of water.

[0061] For example, the components of the artificial aggregate core are: 20 parts of high-calcium solid waste, 80 parts of low-calcium solid waste, 6 parts of alkaline activator and 20 parts of water.

[0062] For example, the components of the artificial aggregate core are: 25 parts of high-calcium solid waste, 75 parts of low-calcium solid waste, 6 parts of alkaline activator and 20 parts of water.

[0063] In the embodiment of the present application in which the artificial aggregate core is configured with the components, the artificial aggregate core prepared according to the configuration of the components is mostly composed of low-calcium solid waste, which has a slow reaction rate and insufficient reaction degree, and is prone to incomplete reaction. The alkaline activator component is relatively small, resulting in a large amount of unreacted solid waste in the core. When cracks form, these unreacted solid waste can react with alkaline ions in the internal environment of the concrete, and the resulting reactants accumulate in the cracks, thereby repairing the cracks. In addition, when the artificial aggregate core is formed, it is dried at high temperature to reduce the internal moisture of the core, thereby further slowing the internal reaction of the core and reducing the reaction degree of the core. More unhydrated materials will be present. After the cracks form, the water in the external environment will promote further reaction of the core, thereby achieving crack repair. Therefore, the artificial aggregate core provides the primary repair function.

[0064] In an achievable embodiment of the present application, the components of the artificial aggregate shell are: 10-50 parts of high-calcium solid waste, 50-90 parts of low-calcium solid waste, 1-15 parts of alkaline activator and 10-50 parts of water.

[0065] For example, the components of the artificial aggregate shell are: 30 parts of high-calcium solid waste, 70 parts of low-calcium solid waste, 10 parts of alkaline activator and 30 parts of water.

[0066] For example, the artificial aggregate shell is composed of 35 parts of high-calcium solid waste, 65 parts of low-calcium solid waste, 10 parts of alkaline activator, and 30 parts of water.

[0067] For example, the artificial aggregate shell is composed of 40 parts of high-calcium solid waste, 60 parts of low-calcium solid waste, 10 parts of alkaline activator, and 30 parts of water.

[0068] For example, the artificial aggregate shell is composed of 45 parts of high-calcium solid waste, 55 parts of low-calcium solid waste, 10 parts of alkaline activator, and 30 parts of water.

[0069] For example, the artificial aggregate shell is composed of 50 parts of high-calcium solid waste, 50 parts of low-calcium solid waste, 10 parts of alkaline activator, and 30 parts of water.

[0070] In the embodiment of the configuration components of the artificial aggregate shell of the present application, the high-calcium solid waste component in the artificial aggregate shell prepared according to the configuration components of the artificial aggregate shell is relatively increased, and the configured alkaline activator component is also relatively high, so that the reaction is more complete, and the hardness of the generated artificial aggregate shell is relatively high, which can play a certain supporting role for the core, so the artificial aggregate shell provides the main strength function.

[0071] In the embodiments that can be realized in the present application, the artificial aggregate core can be prepared by using auxiliary equipment, such as granulation equipment, or by mixing, pouring and crushing. When auxiliary equipment is used, step S100 includes:

[0072] The calcium-containing substance is solid. The solid calcium-containing substance and the alkaline activator are placed in a granulation device according to the preset ratio, a set amount of water is added, and a granular product is obtained by reaction; the granular product is dried to obtain an artificial aggregate core.

[0073] Among them, granulation equipment is a molding machine that can make materials into a specific shape, which can be a wet granulator, dry granulator, mixed granulator, etc.

[0074] Herein, drying may refer to oven drying, air drying, air drying or freeze drying.

[0075] For example, 20 parts of high-calcium solid waste, 80 parts of low-calcium solid waste and 6 parts of alkaline activator are put into a granulator for mixing. After mixing for 3 minutes, the sprayer of the granulator is controlled to slowly spray water, and the water component is 20 parts. After they are mixed and formed, a granular product is obtained. The granular product is placed at 105°C and dried for 24 hours to obtain an artificial aggregate core.

[0076] In an achievable embodiment of the present application, when the artificial aggregate core is prepared by mixing, pouring and crushing, step S100 includes:

[0077] The calcium-containing substance and the alkaline activator are mixed and cast according to the preset ratio to obtain a building block; the building block is crushed to obtain a first pretreated product; and the first pretreated product is dried to obtain an artificial aggregate core.

[0078] Herein, drying may refer to oven drying, air drying, air drying or freeze drying.

[0079] The crushing process can be performed by mechanical crushing or manual crushing.

[0080] For example, 15 parts of high-calcium solid waste, 85 parts of low-calcium solid waste, 6 parts of alkaline activator, and 20 parts of water are mixed to obtain a mixture, and the mixture is poured to obtain building blocks; the building blocks are mechanically crushed to obtain a first pretreated product, and the first pretreated product is placed at 105° C. and dried for 24 hours to obtain an artificial aggregate core.

[0081] In an embodiment of the present application, in order to form an artificial aggregate shell on the surface of the artificial aggregate core, auxiliary equipment such as granulation equipment can be used, or an immersion method can be used. When auxiliary equipment is used, correspondingly, step S101 includes:

[0082] A solid calcium-containing substance and an alkaline activator are mixed into a mixture according to another preset ratio; the artificial aggregate core and the mixture are placed in a granulation device, a set amount of water is added, and the mixture is reacted and formed so that the artificial aggregate shell wraps the artificial aggregate core to obtain a pre-product.

[0083] For example, 35 parts of high-calcium solid waste, 65 parts of low-calcium solid waste and 10 parts of alkaline activator are placed in a granulator for mixing to obtain a mixture, the artificial aggregate core obtained in step S100 is added, and the sprayer of the granulator is controlled to slowly spray water, the water component is 30 parts, and it is formed so that the artificial aggregate shell wraps the artificial aggregate core to obtain a pre-product.

[0084] In an achievable embodiment of the present application, when the immersion method is adopted, correspondingly, step S101 includes:

[0085] The calcium-containing substance and the alkaline activator are mixed into a slurry according to another preset ratio; the artificial aggregate core is immersed in the slurry and then taken out to obtain a second pretreated product; the second pretreated product is dried to solidify the slurry on the surface of the artificial aggregate core to form an artificial aggregate shell, thereby obtaining a pre-product.

[0086] Exemplarily, 35 parts of high-calcium solid waste, 65 parts of low-calcium solid waste, and 10 parts of alkaline activator are mixed, and 30 parts of water are added to mix into a slurry. The artificial aggregate core obtained in step S100 is soaked in the slurry and then taken out to obtain a second pretreated product. The second pretreated product is allowed to stand and solidify to obtain a pre-product.

[0087] In an achievable embodiment of the present application, step S102 includes:

[0088] The pre-product is placed in a room with a temperature of 18 to 22° C. and a humidity greater than 95% for curing; the cured pre-product is placed in a room with a temperature greater than 50° C. for drying for 6 to 24 hours to obtain an artificial aggregate.

[0089] The following describes the details in conjunction with specific embodiments.

[0090] Example 1

[0091] 10 parts of high-calcium solid waste, 90 parts of low-calcium solid waste, 6 parts of alkaline activator, and 20 parts of water are mixed to obtain a mixture, and the mixture is cast to obtain building blocks; the building blocks are mechanically crushed and then dried (drying temperature is 105°C, 24 hours) to obtain artificial aggregate cores; 40 parts of high-calcium solid waste, 60 parts of low-calcium solid waste, 10 parts of alkaline activator, and 30 parts of water are mixed to obtain a slurry, and the dried cores are immersed in the slurry, fished out, and cured after solidification to obtain artificial aggregate.

[0092] Example 2

[0093] 10 parts of high-calcium solid waste, 90 parts of low-calcium solid waste, and 10 parts of alkaline activator are mixed in a granulator. After mixing for 3 minutes, water is slowly sprayed into the mixture through a sprayer to form the mixture. The mixture is then dried (drying temperature is 105°C, 24 hours) to obtain an artificial aggregate core. 40 parts of high-calcium solid waste, 60 parts of low-calcium solid waste, 10 parts of alkaline activator, and 30 parts of water are mixed to obtain a slurry. The dried core is immersed in the slurry, fished out, and solidified before curing to obtain an artificial aggregate.

[0094] Example 3

[0095] 10 parts of high-calcium solid waste, 90 parts of low-calcium solid waste, 6 parts of alkaline activator and 20 parts of water are mixed to obtain a mixture, and the mixture is cast to obtain building blocks; the building blocks are mechanically crushed and then dried (drying temperature is 105°C, 24 hours) to obtain artificial aggregate cores; 30 parts of high-calcium solid waste, 70 parts of low-calcium solid waste and 10 parts of alkaline activator are placed in a granulator for mixing to obtain a mixture, the core and the mixture after high-temperature drying are placed in the granulator, and water is slowly sprayed into the granulator by controlling a sprayer, and the weight of water is about 30 parts. After the blocks are formed, they are cured to obtain artificial aggregate.

[0096] Example 4

[0097] 10 parts of high-calcium solid waste, 90 parts of low-calcium solid waste, and 10 parts of alkaline activator are mixed in a granulator. After mixing for 3 minutes, water is slowly sprayed into the granulator by controlling a sprayer. After the granulator is formed, the weight of the water is about 20 parts. The product is dried (drying temperature is 105° C., 24 hours) to obtain an artificial aggregate core. 30 parts of high-calcium solid waste, 70 parts of low-calcium solid waste, and 10 parts of alkaline activator are placed in a granulator for mixing to obtain a mixture. The dried core and the mixture are placed in a granulator, and water is slowly sprayed into the granulator by controlling a sprayer. The weight of the water is about 30 parts. After the granulator is formed, curing is performed to obtain an artificial aggregate.

[0098] Table 1

[0099]

[0100] The artificial aggregates prepared in Examples 1 to 4 were placed in a standard curing room for curing. After curing for 7 days, cracks were created by high-temperature drying (drying temperature was 105° C., 24 h). The cracked samples were cured in water and saturated Ca(OH)2 solution for 28 days. The crack closure was detected by microscopy and XCT testing. The test data are shown in Table 1 above. It can be seen that the crack closure rates of Examples 1 and 3 are both high, at 80% to 90%. Therefore, the present application can effectively achieve crack repair.

[0101] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A method for preparing artificial aggregate, characterized in that: include: The calcium-containing material and the alkaline activator are mixed and molded according to a preset ratio to obtain an artificial aggregate core; The preset ratio is the molar ratio of calcium element to alkali ion, and the preset ratio is higher than the molar ratio of calcium element to alkali ion when the alkaline activator reacts completely; wherein the calcium-containing substance includes a high-calcium substance and a low-calcium substance, the calcium oxide content of the high-calcium substance is greater than 10wt%, and the calcium oxide content of the low-calcium substance is less than 10wt%; the high-calcium substance includes at least one of steel slag, slag, bottom ash, waste incineration fly ash, and rice ash; the low-calcium substance includes at least one of fly ash, metakaolin, volcanic ash, and red mud. mixing a calcium-containing substance and an alkaline activator and coating the mixture on the surface of the artificial aggregate core to obtain a pre-product; The pre-product is cured and dried to obtain artificial aggregate.

2. The method for preparing artificial aggregate according to claim 1, characterized in that: The calcium-containing substance is solid, and the calcium-containing substance and the alkaline activator are mixed and molded according to a preset ratio, including: The solid calcium-containing substance and the alkaline activator are placed in a granulation device according to the preset ratio, a set amount of water is added, and the reaction is performed to form a granular product; The granulated product is dried to obtain an artificial aggregate core.

3. The method for preparing artificial aggregate according to claim 1, characterized in that: The calcium-containing substance and the alkaline activator are mixed and molded according to a preset ratio to obtain an artificial aggregate core, comprising: Mixing the calcium-containing substance and the alkaline activator according to the preset ratio and pouring the mixture to obtain a building block; Crushing the building blocks to obtain a first preprocessed product; The first pretreated product is dried to obtain an artificial aggregate core.

4. The method for preparing artificial aggregate according to claim 1, characterized in that: The calcium-containing substance and the alkaline activator are mixed and coated on the surface of the artificial aggregate core to obtain a pre-product, comprising: Mixing the calcium-containing substance and the alkaline stimulator into a slurry according to another preset ratio; soaking the artificial aggregate core in the slurry and then taking it out to obtain a second pretreated product; The second pretreated product is dried to solidify the slurry on the surface of the artificial aggregate inner core to form an artificial aggregate outer shell, thereby obtaining a pre-product.

5. The method for preparing artificial aggregate according to claim 1, characterized in that: The calcium-containing substance is solid, and the calcium-containing substance and an alkaline activator are mixed and then coated on the surface of the artificial aggregate core to obtain a pre-product, comprising: Mixing the solid calcium-containing substance and the alkaline activator according to another preset ratio to form a mixture; The artificial aggregate core and the mixed material are placed in a granulation device, and a set amount of water is added to react and form the artificial aggregate core so that the artificial aggregate shell wraps the artificial aggregate core to obtain a pre-product.

6. The method for preparing artificial aggregate according to claim 1, characterized in that: The method of curing and drying the pre-product to obtain the artificial aggregate comprises: The pre-product is placed in a room with a temperature of 18-22°C and a humidity greater than 95% for curing; The cured pre-product is dried at a temperature greater than 50° C. for 6 to 24 hours to obtain an artificial aggregate.

7. The method for preparing artificial aggregate according to claim 1, characterized in that: The alkaline activator includes at least one of sodium metasilicate, sodium carbonate and sodium hydroxide.

8. An artificial aggregate, characterized in that: The artificial aggregate is prepared by the method according to any one of claims 1 to 7.

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