Foaming strength agent for all-solid waste cementing material and preparation method of foaming strength agent

Abstract

The invention relates to a foaming strength agent for an all-solid waste cementing material and a preparation method, and belongs to the technical field of building material preparation. The foaming strength agent comprises the following components in percentage by mass: 40-50% of a foaming agent, less than or equal to 6.5% of a foam stabilizer, less than or equal to 3.5% of manganese dioxide, less than or equal to 6.5% of an accelerator and 38-45% of functional fibers. Through the synergistic effect of manganese dioxide and hydrogen peroxide in the foaming agent, the foaming agent can quickly generate a large number of bubbles to form a compact foam structure. Due to the addition of the foam stabilizer, the fracture and collapse of foams are effectively prevented, and the porosity and uniformity of the foaming material are improved. By adding the accelerator, the curing process of the cementing material is accelerated, and the production efficiency is improved. The mechanical property and durability of the foaming material are remarkably enhanced by adding the functional fibers. And by adding the foam stabilizer, manganese dioxide, accelerator, functional fiber and other assistants, the foam stability and the foaming performance of the material are remarkably improved.

Description

Technical Field

[0001] The present application relates to the technical field of building material preparation, and in particular to a foaming strengthening agent for all-solid waste cementitious materials and a preparation method thereof. Background Art

[0002] my country's construction industry accounts for 40% of the country's annual carbon emissions and 8% of the world's annual carbon emissions. In terms of carbon emissions throughout the life cycle of a building, carbon emissions during the construction phase account for about 24% of all carbon emissions. Most of the carbon emissions during the construction phase of a building come from high-energy-consuming building materials such as cement and steel, and low-emission green building materials only account for 10% of actual engineering applications. There is huge potential for energy conservation and emission reduction in building materials.

[0003] All-solid waste building cementitious materials are made of solid waste resources such as blast furnace slag, steel slag, desulfurized gypsum, etc., which are ground and produced at a certain ratio under normal temperature conditions to have a certain specific surface area, and react with water to form a material with cementitious properties. Since all-solid waste building cementitious materials are produced at room temperature and pressure, compared with ordinary Portland cement, the carbon emission reduction rate of each ton of all-solid waste cementitious materials in the production stage is 60% to 80%. Under the background of carbon peak and carbon neutrality, it can be used as a green material in the building materials industry. With the continuous development of the construction industry and the steel industry, how to effectively use the solid waste generated in the smelting process to reduce the energy consumption of buildings has gradually become a hot topic of concern. The application of industrial solid waste to all-solid waste cementitious materials can not only effectively reduce the carbon emissions generated in the production stage of building materials, but also alleviate the environmental pollution caused by the random stacking of solid waste due to the difficulty in handling. However, the lightweight (foaming) performance of existing all-solid waste cementitious materials is insufficient. Summary of the invention

[0004] The present application provides a foaming strengthening agent for all-solid waste gelling materials and a preparation method thereof, in order to solve the following technical problem: how to improve the foaming performance of all-solid waste gelling materials.

[0005] In the first aspect, an embodiment of the present application provides a foaming agent for all-solid waste cementitious materials, which includes, by mass fraction: foaming agent: 40% to 50%, foam stabilizer ≤6.5%, manganese dioxide ≤3.5%, quick-setting agent ≤6.5%, and functional fiber: 38% to 45%.

[0006] Optionally, the foaming agent is a mixture of hydrogen peroxide and water.

[0007] Optionally, the purity level of the hydrogen peroxide is analytical grade.

[0008] Optionally, in the foaming agent, the mass fraction of the hydrogen peroxide is 25% to 35%.

[0009] Optionally, the foam stabilizer is at least one of propylene glycol, ethyl cellulose, xanthan gum, tragacanth gum, gellan gum, and sodium alginate.

[0010] Optionally, the accelerating setting agent is at least one of anhydrous sodium sulfate, sodium silicate, calcium formate, sodium aluminate, and aluminum sulfate.

[0011] Optionally, the functional fiber is at least one of wheat fiber, polypropylene fiber, glass fiber, and basalt fiber.

[0012] In a second aspect, the present application provides a method for preparing the foaming agent described in the first aspect, the method comprising:

[0013] According to the mass fractions, the foaming agent, the foam stabilizer, the manganese dioxide, the quick-setting agent and the functional fiber are mixed to obtain a mixture;

[0014] The mixed materials are stirred and compounded to obtain a foaming agent.

[0015] Optionally, the rotation speed of the stirring compound is 150 r / min to 300 r / min.

[0016] Optionally, the stirring and compounding time is 45 min to 60 min.

[0017] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0018] The present application provides a foaming agent for all-solid waste cementitious materials, which includes, by mass fraction, a foaming agent: 40% to 50%, a foam stabilizer ≤6.5%, a manganese dioxide ≤3.5%, a quick-setting agent ≤6.5%, and a functional fiber: 38% to 45%. Through the synergistic effect of manganese dioxide and hydrogen peroxide in the foaming agent, the foaming agent can quickly generate a large number of bubbles to form a dense foam structure. The addition of the foam stabilizer effectively prevents the rupture and collapse of the foam and improves the porosity and uniformity of the foaming material. The addition of the quick-setting agent accelerates the curing process of the cementitious material and improves production efficiency. The addition of functional fibers significantly enhances the mechanical properties and durability of the foaming material. By adding additives such as foam stabilizers, manganese dioxide, quick-setting agents and functional fibers, the stability of the foam and the foaming performance of the material are significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 A schematic flow chart of a method for preparing a foaming strengthening agent for all-solid waste gelling materials provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0023] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity and should not be understood as a rigid limitation on the scope of the present application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within the range; for example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which applies regardless of the range; in addition, whenever a numerical range is indicated in this document, it is meant to include any cited numbers (fractions or integers) within the indicated range.

[0024] In this document, the terms including "including" and "including" mean "including but not limited to". 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 such actual relationship or order between these entities or operations. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone; where A and B can be singular or plural. "At least one" means one or more, and "plurality" means two or more; "at least one", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items; for example, "at least one of a, b, or c", or "at least one of a, b, and c" can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple. "Parts" such as parts by weight and parts by mass indicate the proportional relationship between the components. In the proportional relationship involved in this article, the parameters that need to be described by proportion should be understood as the first term of the proportional formula in the order of description, and the proportional numbers should be understood as the second term of the proportional formula. For example, if the mass ratio of substance A, substance B and substance C is 1:2:3, then substance A, substance B and substance C should correspond to the proportional numbers in the proportional formula in the order of description, that is, the mass of substance A: the mass of substance B: the mass of substance C = 1:2:3.

[0025] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this article can be purchased from the market or prepared by existing methods.

[0026] In the first aspect, an embodiment of the present application provides a foaming agent for all-solid waste cementitious materials, which includes, by mass fraction: foaming agent: 40% to 50%, foam stabilizer ≤6.5%, manganese dioxide ≤3.5%, quick-setting agent ≤6.5%, and functional fiber: 38% to 45%.

[0027] Foaming agent: 40% to 50%. Foaming agent is a key component for generating bubbles. It introduces a large number of tiny bubbles into the material through chemical reaction or physical action, thereby increasing the porosity and lightness of the material.

[0028] Foam stabilizer: accounts for no more than 6.5%. The main function of the foam stabilizer is to prevent the foam from breaking or collapsing during the formation process, ensuring the stability and durability of the foam structure. This is crucial to improving the porosity and uniformity of the foaming material.

[0029] Manganese dioxide: no more than 3.5%. Manganese dioxide acts as a catalyst here, synergizing with hydrogen peroxide (or other reactive components) in the foaming agent to accelerate the generation of bubbles. This synergistic effect can generate bubbles quickly and in large quantities, helping to form a dense foam structure.

[0030] Accelerator: The proportion does not exceed 6.5%. The addition of accelerator can significantly accelerate the curing process of cementitious materials, shorten the production cycle, and improve production efficiency. This is especially important for application scenarios that require rapid hardening.

[0031] Functional fibers: 38% to 45%. The addition of functional fibers not only enhances the mechanical properties of the foamed material (such as tensile strength, compressive strength, etc.), but also improves the durability and service life of the material. These fibers act as a skeleton in the material, helping to resist external stress and deformation.

[0032] The present invention uses the alkaline environment provided by the all-solid waste gelling material to promote the ionization of hydrogen peroxide (H2O2) in the foaming agent to generate H - and HO 2- ions. In an alkaline environment, ionization is unidirectional, producing H - Soon after being - Consumed, forming water (H2O). HO 2- As a weak acid radical, it is inherently unstable. After accumulating a certain amount, it begins to decompose and release oxygen (O2). The decomposition process prompts hydrogen peroxide to continue to ionize, forming a cycle and continuously releasing oxygen. The oxygen released by the decomposition of hydrogen peroxide under alkaline conditions forms a large amount of foam in the all-solid waste gelling material. Exemplarily, the mass fraction of the foaming agent can be 40%, 42%, 44%, 46%, 48%, 50%, etc. Adding a foam stabilizer (such as propylene, ethyl cellulose, etc.) can prolong and stabilize the retention time of the foam and improve the stability of the foam. Exemplarily, the mass fraction of the foam stabilizer can be 0.5%, 1.5%, 2.5%, 3.5%, 4.5%, 5.5%, 6.5%, etc. Manganese dioxide can be used as a catalyst to accelerate the decomposition process of hydrogen peroxide and promote the rapid formation of foam. Exemplarily, the mass fraction of manganese dioxide can be 0.5%, 1%, 1.5%, 2%, 2.5%, 3.5%, etc. Accelerators (such as anhydrous sodium sulfate, etc.) help to accelerate the coagulation and hardening process of the cementitious material, so that the foam remains stable during the solidification process. Exemplarily, the mass fraction of the accelerator can be 0.5%, 1.5%, 2.5%, 3.5%, 4.5%, 5.5%, 6.5%, etc. The addition of functional fibers (such as wheat fibers, polypropylene fibers, etc.) not only improves the mechanical properties of the material, but also helps to form evenly distributed closed pores. Exemplarily, the mass fraction of the functional fibers can be 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, etc.

[0033] The present application provides a foaming agent for all-solid waste gelling materials, and the foaming agent has the following effects:

[0034] Rapidly generate a large number of bubbles: Through the synergistic effect of manganese dioxide and foaming agent, this foaming agent can quickly and massively generate bubbles to form a dense foam structure.

[0035] Improve porosity and uniformity: The addition of foam stabilizer effectively prevents the rupture and collapse of the foam, ensuring high porosity and good uniformity of the foaming material.

[0036] Accelerate the curing process: The addition of accelerators significantly shortens the curing time of cementitious materials and improves production efficiency.

[0037] Enhanced mechanical properties and durability: The addition of functional fibers significantly improves the mechanical properties and durability of foam materials, making them more suitable for various application scenarios.

[0038] In summary, the foaming agent for all-solid waste cementitious materials provided in this application achieves efficient, stable and rapid foaming effects through carefully designed ingredients and ratios, and significantly improves the mechanical properties and durability of the materials. This foaming agent is not only suitable for all-solid waste cementitious materials, but may also have a positive impact on other types of lightweight materials, and has broad application prospects and market potential.

[0039] In some embodiments, the foaming agent is a mixture of hydrogen peroxide and water.

[0040] In the embodiment of the present application, the foaming agent is a mixture of hydrogen peroxide and water, and the hydrogen peroxide plays a major foaming role.

[0041] In some embodiments, the purity level of the hydrogen peroxide is analytical grade.

[0042] Hydrogen peroxide, also known as hydrogen peroxide aqueous solution, is a colorless, odorless, transparent strong oxidant and disinfectant, widely used in sterilization, sewage treatment, dyeing and weaving, bleaching and other fields. Analytical purity (AR) is a purity level of chemical reagents, also known as secondary reagents, with a very high purity, usually reaching more than 99.7%, slightly lower than premium purity, suitable for important analysis and general research work.

[0043] In some embodiments, the mass fraction of the hydrogen peroxide in the foaming agent is 25% to 35%.

[0044] As the main component of the foaming agent, the concentration of hydrogen peroxide directly affects the rate and efficiency of the foaming process. Within the mass fraction range of 25% to 35%, hydrogen peroxide can quickly decompose to produce oxygen, forming a stable and uniform foam structure. Hydrogen peroxide within this concentration range not only ensures sufficient foaming power, but also avoids excessive foaming due to excessive concentration, thereby ensuring the quality and performance of the foaming material. Exemplarily, the mass fraction of hydrogen peroxide in the foaming agent can be 25%, 27%, 29%, 31%, 33%, 35%, etc.

[0045] In some embodiments, the foam stabilizer is at least one of propylene glycol, ethyl cellulose, xanthan gum, tragacanth gum, gellan gum, and sodium alginate.

[0046] In the examples of the present application, the purity levels of propylene glycol, ethyl cellulose, xanthan gum, tragacanth gum, gellan gum and sodium alginate are all analytically pure.

[0047] The main function of the foam stabilizer is to stabilize the foam structure and prevent the foam from breaking during its formation and continuation. This is mainly achieved through the following mechanisms:

[0048] Increase the strength of the foam film: Foam stabilizers can enhance the mechanical strength of the foam film, making it more resistant to external pressure and shear force, thereby prolonging the stability time of the foam.

[0049] Regulating the fluidity of the foam film: By regulating the fluidity of the foam film, the foam stabilizer can prevent the foam from bursting due to excessive flow, and also helps to evenly distribute the foam.

[0050] Improve the surface tension of the foam liquid: Foam stabilizers can reduce the surface tension of the foam liquid, making the foam easier to form and more stable.

[0051] In some embodiments, the accelerating setting agent is at least one of anhydrous sodium sulfate, sodium silicate, calcium formate, sodium metaaluminate, and aluminum sulfate.

[0052] In the examples of the present application, the purity levels of anhydrous sodium sulfate, sodium silicate, calcium formate, sodium aluminate and aluminum sulfate are all analytically pure.

[0053] The main function of the accelerator is to accelerate the setting and hardening process of the cementitious material, so that the cementitious material can reach the required strength and stability in a shorter period of time. This is mainly achieved through the following mechanisms:

[0054] Promote hydration reaction: Accelerators can react with moisture and unhydrated cement particles in cementitious materials to accelerate the formation of hydration products, thereby accelerating the setting and hardening process.

[0055] Adjusting the pH value of the slurry: Certain accelerators can change the pH value of the slurry, affecting the rate of the hydration reaction and the stability of the product, thereby accelerating coagulation and hardening.

[0056] Forming early strength: Accelerators can enable cementitious materials to form a certain strength at an early stage, which helps to resist external loads and deformation.

[0057] In some embodiments, the functional fiber is at least one of wheat fiber, polypropylene fiber, glass fiber, and basalt fiber.

[0058] In the examples of the present application, the purity levels of wheat fiber, polypropylene fiber, glass fiber and basalt fiber are all industrial pure. The addition of functional fiber can significantly improve the mechanical properties and durability of the material.

[0059] As a natural fiber, wheat fiber is not only environmentally friendly, but also has good toughness and water absorption. Its addition can improve the crack resistance and durability of cementitious materials. At the same time, due to its natural hydrophilicity, it also helps to improve the workability of the material. Polypropylene fiber is known for its high strength, acid and alkali corrosion resistance and good dispersibility. In cementitious materials, polypropylene fiber can effectively improve the impact resistance and flexural strength of the material. At the same time, its chemical stability also ensures the stable performance of the material in long-term use. Glass fiber has extremely high strength and modulus. At the same time, its thermal stability and electrical insulation are also excellent. In cementitious materials, the addition of glass fiber can significantly improve the overall mechanical properties and heat resistance of the material, and is suitable for occasions with high requirements for material performance. Basalt fiber is a new type of environmentally friendly fiber with good high temperature resistance, corrosion resistance and radiation resistance. In cementitious materials, the addition of basalt fiber can not only improve the strength and durability of the material, but also effectively reduce the shrinkage and cracking of the material.

[0060] In the present application, the purity level of manganese dioxide is analytically pure. During the decomposition process of the foaming agent, manganese dioxide can act as a catalyst to accelerate the rate of the decomposition reaction, making the foaming process more rapid and uniform. This helps to form more and finer bubbles, and improves the porosity and uniformity of the foaming material.

[0061] The foaming agent for all-solid waste gelling materials prepared in the embodiment of the present application has the following advantages and characteristics:

[0062] Improved lightness (foaming) performance: Through the above principle, the present embodiment successfully prepared a foaming agent for all-solid waste cementitious materials, which significantly improved the lightness (foaming) performance of the materials. The uniform distribution and stability of the foam enable the material to maintain lightness while also having good mechanical properties and durability.

[0063] Comply with environmental protection and sustainable development requirements: The embodiments of this application use all-solid waste cementitious materials, reducing dependence on traditional raw materials, and complying with environmental protection and sustainable development requirements. At the same time, the embodiments of this application also comply with the relevant requirements of the "Guidelines for the Construction of a Standard System for Carbon Peaking and Carbon Neutrality in the Industrial Field (2023 Edition)", which will help promote the realization of carbon peaking and carbon neutrality goals in the industrial field.

[0064] The preparation process is simple and the cost is low: The preparation process of the embodiment of the present application is relatively simple, and the required raw materials are easy to obtain and the cost is low. By accurately controlling the proportion of each component and the preparation process, a foaming agent with excellent performance can be prepared.

[0065] In summary, the embodiment of the present application proposes an innovative technology for forming foam by decomposing all-solid waste gelling materials and hydrogen peroxide under alkaline conditions. By adding additives such as foam stabilizers, manganese dioxide, quick-setting agents and functional fibers, the stability of the foam and the performance of the material are significantly improved. The embodiment of the present application not only meets the requirements of environmental protection and sustainable development, but also has the advantages of simple preparation process and low cost, and has broad application prospects in the field of all-solid waste gelling materials.

[0066] Figure 1 A schematic flow chart of a method for preparing a foaming strengthening agent for all-solid waste gelling materials provided in an embodiment of the present application.

[0067] See also Figure 1 In a second aspect, the present application provides a method for preparing the foaming agent described in the first aspect, the method comprising:

[0068] S1. Mixing the foaming agent, the foam stabilizer, the manganese dioxide, the quick-setting agent and the functional fiber according to the mass fractions to obtain a mixture;

[0069] S2, stirring and compounding the mixed materials to obtain a foaming agent.

[0070] In some embodiments, the stirring and compounding has a rotation speed of 150 r / min to 300 r / min.

[0071] In some embodiments, the stirring and compounding time is 45 min to 60 min.

[0072] The product prepared by the method for preparing the foaming agent is the above-mentioned foaming agent. Since the method for preparing the foaming agent adopts part or all of the technical solutions of the foaming agent embodiment, it at least has all the beneficial effects brought by the technical solutions of the foaming agent embodiment, which will not be described one by one here.

[0073] The present application is further described below in conjunction with specific examples. The experimental methods in the following examples where specific conditions are not specified are usually measured in accordance with national standards / industry standards; if there are no corresponding national standards / industry standards, they are measured in accordance with common international standards, conventional conditions or conditions recommended by the manufacturer.

[0074] Example 1

[0075] In terms of mass fraction, the foaming agent includes: foaming agent: 40.0%, foam stabilizer: 6.5%, manganese dioxide: 2.0%, accelerating setting agent: 6.5%, and functional fiber: 45.0%. The foaming agent is a mixture of hydrogen peroxide (analytical grade) and water, wherein the mass fraction of hydrogen peroxide is 35%; the foam stabilizer is propylene, and is analytical grade; the manganese dioxide is analytical grade; the accelerating setting agent is aluminum sulfate, and is analytical grade; the functional fiber is wheat fiber, and is industrial grade.

[0076] The foaming agent, foam stabilizer, manganese dioxide, quick-setting agent and functional fiber are compounded and stirred for 45 minutes using a stirrer at a speed of 300 r / min to obtain a foaming strengthening agent.

[0077] Example 2

[0078] In terms of mass fraction, the foaming agent includes: foaming agent: 50.0%, foam stabilizer: 4.5%, manganese dioxide: 3.5%, accelerating setting agent: 4%, and functional fiber: 38.0%. The foaming agent is a mixture of hydrogen peroxide (analytical grade) and water, wherein the mass fraction of hydrogen peroxide is 25%; the foam stabilizer is sodium alginate, which is analytical grade; the manganese dioxide is analytical grade; the accelerating setting agent is sodium metaaluminate, which is analytical grade; and the functional fiber is basalt fiber, which is industrial grade.

[0079] The foaming agent, foam stabilizer, manganese dioxide, quick-setting agent and functional fiber are compounded and stirred for 60 minutes using a stirrer at a rotation speed of 200 r / min to obtain a foaming strengthening agent.

[0080] Example 3

[0081] In terms of mass fraction, the foaming agent includes: foaming agent: 42.0%, foam stabilizer: 6%, manganese dioxide: 3.0%, accelerating setting agent: 5.5%, and functional fiber: 43.5%. The foaming agent is a mixture of hydrogen peroxide (analytical grade) and water, wherein the mass fraction of hydrogen peroxide is 30%; the foam stabilizer is ethyl cellulose, which is analytical grade; the manganese dioxide is analytical grade; the accelerating setting agent is anhydrous sodium sulfate, which is analytical grade; and the functional fiber is glass fiber, which is industrial grade.

[0082] The foaming agent, foam stabilizer, manganese dioxide, quick-setting agent and functional fiber are compounded and stirred for 50 minutes using a stirrer at a speed of 250 r / min to obtain a foaming strengthening agent.

[0083] Example 4

[0084] In terms of mass fraction, the foaming agent includes: foaming agent: 48.0%, foam stabilizer: 5%, manganese dioxide: 2.5%, accelerating setting agent: 6%, and functional fiber: 38.5%. The foaming agent is a mixture of hydrogen peroxide (analytical grade) and water, wherein the mass fraction of hydrogen peroxide is 25%; the foam stabilizer is tragacanth gum, which is analytical grade; the manganese dioxide is analytical grade; the accelerating setting agent is sodium silicate, which is analytical grade; and the functional fiber is polypropylene fiber, which is industrial grade.

[0085] The foaming agent, foam stabilizer, manganese dioxide, quick-setting agent and functional fiber are compounded and stirred for 55 minutes using a stirrer at a speed of 150 r / min to obtain a foaming strengthening agent.

[0086] Example 5

[0087] In terms of mass fraction, the foaming agent includes: foaming agent: 46.0%, foam stabilizer: 5.5%, manganese dioxide: 3.5%, accelerating setting agent: 4.5%, and functional fiber: 40.5%. The foaming agent is a mixture of hydrogen peroxide (analytical grade) and water, wherein the mass fraction of hydrogen peroxide is 35%; the foam stabilizer is xanthan gum, which is analytical grade; the manganese dioxide is analytical grade; the accelerating setting agent is calcium formate, which is analytical grade; and the functional fiber is basalt fiber, which is industrial grade.

[0088] The foaming agent, foam stabilizer, manganese dioxide, quick-setting agent and functional fiber are compounded and stirred for 45 minutes using a stirrer at a speed of 250 r / min to obtain a foaming strengthening agent.

[0089] Example 6

[0090] In terms of mass fraction, the foaming agent includes: foaming agent: 44.0%, foam stabilizer: 6.0%, manganese dioxide: 3.0%, quick-setting agent: 5.0%, and functional fiber: 42%. The foaming agent is a mixture of hydrogen peroxide (analytical grade) and water, wherein the mass fraction of hydrogen peroxide is 30%; the foam stabilizer is gellan gum, which is analytical grade; the manganese dioxide is analytical grade; the quick-setting agent is sodium aluminate, which is analytical grade; and the functional fiber is basalt fiber, which is industrial grade.

[0091] The foaming agent, foam stabilizer, manganese dioxide, quick-setting agent and functional fiber are compounded and stirred for 55 minutes using a stirrer at a rotation speed of 200 r / min to obtain a foaming strengthening agent.

[0092] The solid waste cementitious material (S95 ore powder content of 55%, hot press slag powder content of 25%, refined slag powder content of 5%, desulfurized gypsum content of 15%, fineness of 350-400 mesh) was used as the cementitious material, and the foaming agent was added in the solid waste cementitious material at a content of 5%. A series of solid waste cementitious material samples mixed with the foaming agent were prepared, with a water-cement ratio of 0.4 and a foaming temperature of 20°C. The mechanical properties of the solid waste cementitious material samples mixed with the foaming agent were tested according to GB / T 17671-2021 "Test Method for Strength of Cement Mortar (ISO Method)". The results are shown in Table 1.

[0093] Table 1

[0094] Group <![CDATA[Density (kg / m 3 )]]> Compressive strength(MPa) All-solid waste cementitious material without foaming agent 1353 5.13 The all-solid waste cementitious material of Example 1 615 1.63 The all-solid waste cementitious material of Example 2 626 1.82 The all-solid waste cementitious material of Example 3 812 1.69 The all-solid waste cementitious material of Example 4 626 1.84 The all-solid waste cementitious material of Example 5 617 1.76 The all-solid waste cementitious material of Example 6 624 1.71

[0095] It can be seen from Table 1 that the density of the all-solid waste cementitious material without the addition of a foaming agent is large, while the density of the all-solid waste cementitious material with the addition of a foaming agent is small, which significantly improves the lightweight (foaming) performance of the material.

[0096] One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0097] The embodiments of the present invention not only meet the requirements of environmental protection and sustainable development, but also have the advantages of simple preparation process, low cost, etc., and have broad application prospects in the field of all-solid waste cementitious materials.

[0098] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. It will be apparent to those skilled in the art that various modifications to these embodiments are possible, and the general principles defined in the present application can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown in the present application, but will conform to the widest range consistent with the principles and novel features applied for by the present application.

Claims

1. A foaming agent for all-solid waste cementitious materials, which comprises, by mass fraction, a foaming agent: 40%~50%, foam stabilizer ≤6.5%, manganese dioxide ≤3.5%, accelerating setting agent ≤6.5%, functional fiber: 38%~45%.

2. The foaming agent according to claim 1, characterized in that The foaming agent is a mixture of hydrogen peroxide and water.

3. The foaming agent according to claim 2, characterized in that: In the foaming agent, the mass fraction of the hydrogen peroxide is 25% to 35%.

4. The foaming agent according to claim 2 or 3, characterized in that: The purity level of the hydrogen peroxide is analytical grade.

5. The foaming agent according to claim 1, characterized in that: The foam stabilizer is at least one of propylene glycol, ethyl cellulose, xanthan gum, tragacanth gum, gellan gum and sodium alginate.

6. The foaming agent according to claim 1, characterized in that: The accelerating setting agent is at least one of anhydrous sodium sulfate, sodium silicate, calcium formate, sodium metaaluminate and aluminum sulfate.

7. The foaming agent according to claim 1, characterized in that: The functional fiber is at least one of wheat fiber, polypropylene fiber, glass fiber and basalt fiber.

8. A method for preparing the foaming agent according to any one of claims 1 to 7, the method comprising: The foaming agent, the foam stabilizer, the manganese dioxide, the quick-setting agent and the functional fiber are mixed according to the mass fractions to obtain a mixture; The mixed materials are stirred and compounded to obtain a foaming agent.

9. The method according to claim 8, characterized in that The rotation speed of the stirring compound is 150r / min to 300r / min.

10. The foaming agent according to claim 1, characterized in that: The stirring and compounding time is 45 min to 60 min.

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