Green high-performance solid waste-based cementing material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of cementing materials, in particular to a green high-performance solid-waste-based cementing material as well as a preparation method and application thereof. The green high-performance solid waste-based cementing material is prepared from the following raw materials in parts by weight: 15 to 25 parts of cement clinker, 15 to 25 parts of desulfurized gypsum, 0 to 5 parts of quick lime, 50 to 60 parts of superfine slag powder, 0 to 18 parts of red mud, 0 to 10 parts of manganese slag, 0 to 10 parts of carbide slag, 0 to 15 parts of fly ash, 0 to 10 parts of alkaline residue and 0 to 2 parts of exciting agent. According to the preparation process of the material, effective utilization of solid waste is realized, efficient resource conversion of the solid waste is promoted, and carbon dioxide emission in the high-energy-consumption clinker production process is remarkably reduced; other industrial wastes can be solidified in the production process, heavy metal polluted soil and wastewater are treated, energy consumption and pollution emission are reduced, and sustainable development of the building industry is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of cementitious materials, and in particular to a green, high-performance solid waste-based cementitious material and a preparation method and application thereof. Background Art

[0002] Cementitious materials play a key role in numerous engineering projects, particularly in road construction, underground cementitious filling, building construction, 3D-printed buildings, water conservancy projects, nuclear power plant construction, and national defense projects. These materials require high strength, durability, corrosion resistance, crack resistance, and wear resistance. Existing cementitious materials suffer from the following main shortcomings: low crack resistance and toughness, which lead to cracks; insufficient durability in harsh environments, which affects service life; high energy consumption and high CO2 emissions during production, which negatively impact the environment; workability needs to be improved to adapt to different construction requirements; raw material sourcing relies on limited natural resources, which affects cost and sustainability; poor impermeability and corrosion resistance, which limits their scope of application; high cost, which restricts widespread adoption; and the lack of unified technical specifications and industry standards for new cementitious materials, which hinders their large-scale and commercial application. Therefore, the development of green, high-performance, solid waste-based cementitious materials to improve their overall performance, reduce costs, and enhance environmental adaptability and safety is of great practical significance and urgency. Green, high-performance solid waste-based cementitious materials utilize industrial byproducts and waste materials, such as granulated blast furnace slag, steel slag, and desulfurized gypsum, to produce environmentally friendly, potentially hydraulic building materials. These materials have a similar chemical composition to cement clinker, but with lower energy consumption and CO2 emissions during production. This helps reduce environmental impact, promotes the cement industry's transition to a low-carbon, environmentally friendly approach, and addresses environmental pollution issues caused by industrial solid waste.

[0003] The current research on cementitious materials includes the following technologies: Chinese patent CN115321848A discloses a green, high-performance road cementitious material based on industrial solid waste. By using a reasonable ratio of steel slag, slag, desulfurized gypsum and admixtures, an environmentally friendly road material with high early strength, adjustable setting time, good working performance and short curing time is prepared.

[0004] Chinese patent CN110330299A discloses a green, high-performance cementitious material prepared from industrial solid waste. This technology prepares green, high-performance cementitious materials from industrial solid waste (such as steel slag tailings, blast furnace water-quenched slag, etc.), stimulates the activity of solid waste by adding high-efficiency grinding aids and activators, and special cement, reduces the proportion of cement clinker, reduces CO2 emissions, and achieves high-value utilization of solid waste.

[0005] Chinese patent CN1887764A discloses a low-carbon, green, and ecological cementitious material based entirely on solid waste and its manufacturing method. This technology utilizes pretreated tailings as the primary raw material, combined with specialty cement and high-efficiency grinding aids, to produce a high-performance cementitious material. This method aims to improve solid waste utilization, reduce costs, and minimize environmental pollution. However, cement-based materials suffer from high brittleness, low toughness, and are highly sensitive to construction conditions (such as temperature and humidity). Cement-based materials typically have high compressive strength but low tensile and impact strength. Furthermore, the high energy consumption and CO2 emissions associated with cement production still require further resolution.

[0006] None of the above technologies clearly address long-term durability, such as impermeability, weather resistance, and chemical resistance, and they also suffer from brittleness and low toughness. Further research is needed to determine durability, cost-effectiveness, and the stability and adaptability of material properties under different environmental conditions. Summary of the Invention

[0007] The present invention provides a green, high-performance solid waste-based cementitious material and a preparation method and application thereof, aiming to solve the technical problems existing in existing cementitious materials.

[0008] The present invention provides a green high-performance solid waste-based cementitious material, which is composed of the following raw materials in parts by weight: 15-25 parts of cement clinker, 15-25 parts of desulfurized gypsum, 0-5 parts of quicklime, 50-60 parts of slag powder, 0-18 parts of red mud, 0-10 parts of manganese slag, 0-10 parts of calcium carbide slag, 0-15 parts of fly ash, 0-10 parts of alkali residue, and 0-2 parts of activator.

[0009] As a further improvement of the present invention, the cement clinker, desulfurized gypsum, quicklime, slag powder, red mud, manganese slag, carbide slag, fly ash and alkali slag are all dried and then ground to the required fineness by a grinding machine for later use.

[0010] As a further improvement of the present invention, the red mud powder is a gel material.

[0011] As a further improvement of the present invention, the cement clinker is a fine powder obtained by crushing and refining slag, and the slag includes iron slag, copper slag, and aluminum slag.

[0012] As a further improvement of the present invention, the slag powder often includes iron slag, copper slag, and aluminum slag.

[0013] As a further improvement of the present invention, the manganese slag is industrial waste residue generated during the processing of manganese ore, and its main components include water-soluble salt compounds of manganese sulfate and ammonium sulfate and heavy metal ions of zinc, nickel and cobalt.

[0014] As a further improvement of the present invention, the activator includes sodium silicate, sodium carbonate, triethanolamine, sodium sulfate, citric acid, calcium chloride, and sodium hydroxide.

[0015] The present invention also provides a method for preparing a green, high-performance solid waste-based gelling material, comprising the following steps: S1. According to the formula, cement clinker, desulfurized gypsum, quicklime, slag powder, red mud, manganese slag, carbide slag, fly ash, alkali residue are sequentially put into the mixer and mixed evenly as grouting raw materials; S2. Mix the grouting raw materials and the activator and stir them evenly to obtain a green high-performance solid waste-based cementitious material.

[0016] As a further improvement of the present invention, the stirring time in step S1 is at least 4 minutes.

[0017] The present invention also provides an application of a green, high-performance solid waste-based gelling material, comprising the steps of: S3. Mixing the green, high-performance solid waste-based cementitious material according to any one of claims 1 to 7 with a water-containing soil to obtain a green, high-performance solid waste-based solidified soil; pouring the green, high-performance solid waste-based solidified soil, and applying it to mine filling, bagged solidified soil filling and enclosure, culvert backfill, roadbed pouring, platform backfill, vertical roadbed reconstruction and expansion, slope embankment filling, cofferdam pouring, vegetation slope protection and restoration, lightweight engineering, ecological road engineering, foundation reinforcement engineering, grouting reinforcement engineering, low-carbon concrete engineering, artificial reef engineering, high-standard farmland construction engineering, 3D printing engineering, and artificial building materials; S4. Start curing promptly after pouring green high-performance solid waste-based soil: Covering curing requires covering with straw mats or the like when there is no obvious moisture after the concrete is poured and initially leveled, and keep the covering moist; water curing starts after the final setting of the concrete, and requires watering 2 to 3 times a day until the strength reaches 70% to 80%; spray curing is implemented after final setting, and the frequency is adjusted according to the environment to keep it moist; water storage curing is to immerse the components in water and maintain the water quality; steam curing is carried out after pouring, controlling the temperature at 60 to 90°C and high humidity to accelerate hardening; humid environment curing relies on natural conditions, ensuring a humidity of not less than 70% and avoiding the influence of extreme climate; chemical curing is to apply chemicals after there is no obvious moisture on the concrete surface, and check regularly.

[0018] The beneficial effects of the present invention are as follows: the green, high-performance solid waste-based cementitious material is prepared from cement clinker, desulfurized gypsum, quicklime, slag powder, red mud, manganese slag, carbide slag, fly ash, alkali slag and activator in different proportions. Changing the proportions can realize the solidification of other industrial wastes in the production process, treat heavy metal-contaminated soil and wastewater, reduce energy consumption and pollution emissions, and contribute to the sustainable development of the construction industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a comparison chart of the initial setting time of the cement paste and the solid waste-based paste in the present invention; Figure 2 This is a comparison chart of the final setting time of the cement paste and the solid waste-based paste in the present invention; Figure 3 This is a comparison chart of the fluidity of the cement paste and the solid waste-based paste in the present invention; Figure 4 This is a comparison chart of the compressive strength of the cement paste and solid waste-based paste in the present invention after curing for 7 days; Figure 5 This is a comparison chart of the compressive strength of the cement paste and solid waste-based paste in the present invention after curing for 28 days; Figure 6 This is a comparison chart of the compressive strength of the cement paste and solid waste-based paste in the present invention after curing for 180 days; Figure 7 This is an electron microscope scan of the cement-solidified soil of the present invention; Figure 8 This is an electron microscope scanning image of the solid waste-based solidified soil in the present invention; Figure 9 This is a comparison chart of the initial setting time of the solid waste-based curing agent at different moisture contents in the present invention; Figure 10 This is a comparison chart of the final setting time of the solid waste-based curing agent at different moisture contents in the present invention; Figure 11 This is a comparison chart of the fluidity of the solid waste-based curing agent at different water contents in the present invention; Figure 12 This is a comparison chart of the compressive strength of the solidified soil of the cement-based cementitious material and the solid waste-based cementitious material after curing for 28 days; Figure 13 This is a comparison chart of the compressive strength of solidified soil with a 5% green high-performance solid waste-based cementitious material content in the present invention; Figure 14 This is a comparison chart of the compressive strength of solidified soil with a 10% green high-performance solid waste-based cementitious material content in the present invention; Figure 15 This is a comparison chart of the compressive strength of the solidified soil with a 15% green high-performance solid waste-based cementitious material content in the present invention; Figure 16 is the 3-d shear strength diagram of cement-stabilized soil in the present invention; Figure 17 This is the 3-day shear strength diagram of the solid waste-based solidified soil in the present invention; Figure 18 This is a pH value diagram of the cement-solidified soil leachate of the present invention; Figure 19 This is a pH value diagram of the solid waste-based solidified soil leachate in the present invention; Figure 20 is the water stability diagram of cement-solidified soil in the present invention; Figure 21 It is the water stability diagram of solidified soil based on solid waste in the present invention; Figure 22 This is a graph showing the relationship between double-amplitude axial strain and loading times of the double-liquid-limit solid waste-based solidified soil in the present invention; Figure 23 This is a stress-strain relationship curve of the 2-times liquid limit solid waste-based solidified soil in the present invention; Figure 24 This is a graph showing the relationship between the damping ratio of the 2-fold liquid-limited solid waste-based solidified soil and the number of loading times in the present invention. DETAILED DESCRIPTION

[0020] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0021] This invention proposes a green, high-performance solid waste-based cementitious material. This material primarily consists of cement clinker, desulfurized gypsum, quicklime, slag powder, red mud, manganese slag, carbide slag, fly ash, alkali slag, and an activator. This material exhibits excellent fluidity and a short curing time, enabling it to quickly achieve the required strength for a project, improving construction efficiency and reducing the construction cycle. The preparation method is simple and has broad application prospects.

[0022] Specifically, the green high-performance solid waste-based cementitious material is composed of the following raw materials in parts by weight: 15-25 parts of cement clinker, 15-25 parts of desulfurization gypsum, 0-5 parts of quicklime, 50-60 parts of slag powder, 0-18 parts of red mud, 0-10 parts of manganese slag, 0-10 parts of calcium carbide slag, 0-15 parts of fly ash, 0-10 parts of alkali slag, and 0-2 parts of activator.

[0023] Among them, the above raw materials, cement clinker, desulfurized gypsum, quicklime, slag powder, red mud, manganese slag, carbide slag, fly ash, and alkali slag, need to be dried (naturally dried or mechanically dried), and then ground to the required fineness using appropriate grinding machinery for use. The grinding fineness can be adjusted according to the specific requirements of the user, and only grinding and homogenization are required, without calcination, so the production cost is relatively low.

[0024] Slag powder includes iron slag, copper slag, aluminum slag, etc. Manganese slag is an industrial waste generated during the processing of manganese ore. Its main components include water-soluble salt compounds such as manganese sulfate and ammonium sulfate, as well as heavy metal ions such as zinc, nickel, and cobalt. Red mud is a solid waste generated by the aluminum industry after iron ore beneficiation.

[0025] Desulfurization gypsum is primarily composed of calcium sulfate dihydrate (CaSO₄·2H₂O). Quicklime, an inorganic compound, is calcium oxide (CaO). Alternatives such as phosphogypsum and titanium gypsum can be used, but chemical balance must be considered.

[0026] Activators include sodium silicate, sodium carbonate, triethanolamine, sodium sulfate, citric acid, calcium chloride, and sodium hydroxide. They can be in liquid or powder form. These various activators are used to stimulate activity and enhance the effectiveness of the cementitious material, such as increasing the degree of reaction and improving strength.

[0027] The method for preparing the green high-performance solid waste-based cementitious material of the present invention comprises the following steps: S1. Add cement clinker, desulfurized gypsum, quicklime, slag powder, red mud, manganese slag, carbide slag, fly ash, and alkali slag into a mixer in sequence according to the formula, start the mixer, and mix evenly to prepare the grouting raw materials.

[0028] S2. Slowly pour the activator into the blender in the corresponding proportion, mix it with the grouting raw materials and stir it evenly. After stirring, a green high-performance solid waste-based cementitious material is obtained.

[0029] After cement clinker, desulfurization gypsum, quicklime, slag powder, red mud, manganese slag, carbide slag, fly ash, alkali slag and activator are added to the mixer in the prescribed proportions, stirring must be continued for at least 4 minutes.

[0030] The green, high-performance solid waste-based cementitious material of this invention can be applied to projects such as road construction, underground cementitious filling, building construction, 3D-printed buildings, water conservancy projects, nuclear power plant construction, and national defense projects. It can also provide solid waste treatment and storage solutions for businesses that generate solid waste, reducing their costs and generating additional gross profits for cementitious material manufacturers, resulting in significant economic benefits.

[0031] The present invention is further described below with reference to the embodiments.

[0032] Example 1:

[0033] A green, high-performance solid waste-based cementitious material is made from the following raw materials in parts by weight: Cement clinker is 18 parts, desulfurized gypsum is 16 parts, quicklime is 2 parts, slag powder is 50 parts, red mud is 5 parts, manganese slag is 2 parts, carbide slag is 2 parts, fly ash is 5 parts, alkali slag is 4 parts, and sodium silicate is 1 part. Comparison of initial setting time, final setting time, fluidity and compressive strength at 7 days, 28 days and 180 days between cement paste and solid waste-based paste, as shown in the figure. Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 As shown, from Figure 1 and Figure 2 It can be seen that the initial and final setting times of solid waste-based curing agents are slightly longer than those of slag silicate cement. Figure 3 It can be seen that the fluidity of solid waste-based solidifying agent is greater than that of slag silicate cement, which can provide possibilities for more construction scenarios. The microstructure of cement-solidified soil and solid waste-based solidified soil, such as Figure 7 、 Figure 8 As shown in the figure, cement + water = cement paste; solid waste-based cementitious material + water = solid waste-based paste; solid waste-based cementitious material is a hydraulic cementitious material produced mainly from solid waste, similar to cement.

[0034] The steps of the preparation method of the above-mentioned green high-performance solid waste-based cementitious material are as follows: S1. Add cement clinker, desulfurized gypsum, quicklime, slag powder, red mud, manganese slag, carbide slag, fly ash, and alkali slag into a mixer in sequence according to the formula and mix them evenly to prepare the grouting raw materials.

[0035] S2. Mix the grouting raw materials and 1 part of the activator evenly to obtain a green high-performance solid waste-based cementitious material.

[0036] Example 2:

[0037] A green, high-performance solid waste-based cementitious material that uses industrial by-products and waste (such as steel slag, slag, desulfurization gypsum, etc.) as the main raw materials to treat soil with different moisture contents to generate green, high-performance solid waste-based solidified soil.

[0038] A green, high-performance solid waste-based cementitious material is made from the following raw materials in parts by weight: The content of cement clinker is 20 parts, desulfurized gypsum is 16 parts, quicklime is 4 parts, slag powder is 52 parts, red mud is 3 parts, manganese slag is 2 parts, and sodium carbonate is 0.9 parts. The moisture content of the soil is 40%, 60% and 80%. Comparison of initial setting time, final setting time and fluidity of 5%, 10% and 15% solid waste-based cementitious materials at different moisture contents, comparison of compressive strength of cement-based cementitious materials and solid waste-based cementitious materials after 28 days of curing, comparison of compressive strength of 5%, 10% and 15% green high-performance solid waste-based cementitious materials, comparison of 3d shear strength, pH value and water stability, etc. Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 、 Figure 16 、 Figure 17 、 Figure 18 、 Figure 19 、 Figure 20 、 Figure 21The relationship between the double-amplitude axial strain and the number of loadings, the stress-strain relationship, and the damping ratio of the 2-fold liquid-limited solid waste-based solidified soil as shown in Figure 2. Figure 22 、 Figure 23 、 Figure 24 shown.

[0039] The steps of the preparation method of the above-mentioned green high-performance solid waste-based gelling material are as follows: S1. Add cement clinker, desulfurized gypsum, quicklime, slag powder, red mud, and manganese slag into a mixer in the prescribed amount and mix them evenly to prepare the grouting raw materials.

[0040] S2. Mix the grouting raw materials and 0.9 parts of the activator evenly to obtain a green, high-performance solid waste-based cementitious material.

[0041] The present invention prepares and applies green, high-performance, solid waste-based solidified soil based on the above-mentioned method for preparing green, high-performance, solid waste-based cementitious materials.

[0042] The steps of preparing green high-performance solid waste-based solidified soil are as follows: The above-mentioned green high-performance solid waste-based cementitious materials are mixed with soil to form green high-performance solid waste-based solidified soil, and the soil moisture content is 40%, 60% and 80%.

[0043] The steps of the preparation method of the green high-performance solid waste-based solidified soil are as follows: S3. Based on S1 and S2, a green, high-performance solid waste-based cementitious material was obtained. Green, high-performance solid waste-based cementitious material at different dosages of 5%, 10%, and 15% was mixed with soil with moisture contents of 40%, 60%, and 80% to obtain green, high-performance solid waste-based stabilized soil.

[0044] S4. Green high-performance solid waste-based solidified soil should be cured promptly after pouring. First, covering curing requires that after the concrete is poured and initially leveled, straw mats should be used for covering when there is no obvious moisture, and the covering should be kept moist; secondly, water curing starts after the final setting of the concrete, and watering is required 2 to 3 times a day until the strength reaches 70% to 80%; spray curing is implemented after final setting, and the frequency is adjusted according to the environment to keep it moist; water storage curing is to immerse the components in water and maintain the water quality; steam curing is carried out after pouring, controlling the temperature at 60 to 90°C and high humidity to accelerate hardening; humid environment curing relies on natural conditions, ensuring a humidity of not less than 70% and avoiding the influence of extreme climate; chemical curing is to apply chemicals after there is no obvious moisture on the concrete surface, and check regularly.

[0045] Application technology and usage scenarios of green high-performance solid waste-based solidified soil: Green high-performance solid waste-based soil can be used in many fields such as mines, pipeline corridors, foundation pits, fertilizer troughs, "three back" filling, road construction, foundation leveling, soil repair, foundation engineering, sludge treatment, foundation reinforcement, grouting reinforcement, artificial building materials, artificial reefs, high-standard farmland construction, ecological roads, landscaping and construction engineering, especially in complex engineering scenarios such as narrow space operations, special-shaped and heterogeneous structure processing, deep backfill, high-standard backfill quality requirements, inconvenient material transportation, underwater construction environment and tight construction schedule. Some of the above application technologies and scenarios are as follows: a. Mine filling: Green, high-performance solid waste-based solidified soil, derived from S3, enables backfill repair in mining projects. This technology uses green, high-performance solid waste-based solidified soil as the primary raw material, which is transported via a pipeline system to the mine goaf for backfilling. The flowability, pressure, and setting time of the backfill can be precisely controlled through the coordinated action of the thickener, solid waste base silo, and sand silo. After backfilling is complete, maintenance and regular inspections are required according to S4.

[0046] b. Bag-solidified soil filling enclosure: Based on the green, high-performance solid waste-based solidified soil obtained in S3, the filling and throwing enclosure project of bagged solidified soil was realized. This technology uses green solid waste as the basic material, and injects it into a closed structure such as geotextile bags through pipeline automated injection and pressure technology to prepare bagged solidified soil with a certain strength. Subsequently, the solidified soil bags are thrown into the predetermined water location using the throwing and filling method, and the enclosure structure is stacked by the stacking method to form the required height. It is especially suitable for temporary embankment and maintenance for emergency rescue and disaster prevention. The timing of throwing and stacking needs to be combined with the needs of the project. After completing the filling and throwing enclosure project, maintenance and regular inspections are required according to S4.

[0047] c. Pipe culvert backfill: Based on the green, high-performance solid waste-based stabilized soil obtained in S3, a pipe culvert backfill project using green, high-performance solid waste-based stabilized soil was implemented. This technology involves wrapping the excavated and buried pipe culvert with backfill, requiring self-leveling to fill all gaps until the design elevation is reached. After the pipe culvert backfill project is completed, maintenance and regular inspections are required according to S4.

[0048] d. Cast-in-place roadbed: Based on the green, high-performance solid waste-based stabilized soil obtained in S3, a cast-in-place roadbed project using this technology is realized. After the roadbed formwork is installed, the green, high-performance solid waste-based stabilized soil should be injected via pipes or tank trucks until it self-levels to the predetermined design height. Furthermore, appropriate reinforcement structures can be designed based on specific needs. After the cast-in-place roadbed project is completed, maintenance and regular inspections are required according to S4.

[0049] e. Backfill of platform: Based on the green, high-performance solid waste-based stabilized soil obtained in S3, a platform backfill project with green, high-performance solid waste-based stabilized soil was completed. This technology first requires formwork support to create an enclosed space behind the platform. The green, high-performance solid waste-based stabilized soil is then injected via pipes or tank trucks until it is completely filled. After the platform backfill is completed, maintenance and regular inspections are required according to S4.

[0050] f. Vertical roadbed reconstruction and expansion: Based on the green high-performance solid waste-based solidified soil obtained in S3, a vertical roadbed renovation and expansion project using green high-performance solid waste-based solidified soil has been realized. This technology effectively reduces the need for land expropriation along the route and significantly saves construction costs. First, the boundaries of the original roadbed need to be carefully processed and cleaned, and then the vertical formwork is installed according to the expansion width. Next, the green high-performance solid waste-based solidified soil is poured into the required space through pipes or tank trucks until the predetermined elevation is reached. The support for the vertical roadbed renovation and expansion needs to meet the requirements, and it is necessary to consider layered compaction after a certain curing time. After completing the vertical roadbed renovation and expansion project, maintenance and regular inspections are required according to S4.

[0051] g. Slope embankment: Based on the green, high-performance solid waste-based stabilized soil obtained in S3, a slope embankment protection project using green, high-performance solid waste-based stabilized soil was realized. This technology involves installing vertical baffles on the slope and embankment edges and using pipeline pumping technology for backfilling. After the slope embankment protection project is completed, maintenance and regular inspections are required according to S4.

[0052] h. Cofferdam pouring: Based on the green, high-performance solid waste-based solidified soil obtained in S3, a cofferdam casting project for green, high-performance solid waste-based solidified soil was realized. This technical research involves constructing a steel skeleton on the foundation base, or adopting a horseshoe-shaped, trapezoidal support structure, and pouring concrete through pipeline pumping technology until the predetermined elevation is reached. It can be used for temporary embankments and isolation structures in water areas. Consider using steel bars in the cofferdam and bottom foundation to improve integrity. After completing the cofferdam casting project, maintenance and regular inspections are required according to S4.

[0053] i. Vegetation slope protection and restoration: Based on the green, high-performance solid waste-based stabilized soil obtained in S3, a green, high-performance solid waste-based stabilized soil vegetation slope protection and restoration project has been implemented. This technology uses a stirring device to mix seeds with the green, high-performance solid waste-based stabilized soil, and then applies it to the slope and the surface layer of the soil to be restored through pipe spraying technology. Based on the soil fertility requirements, appropriate nutrients are added, and suitable high-nutrient soil is selected. The strength of the solid waste-based stabilized soil mixture must be lower than the critical force required for seed germination and root growth. The pH range is controlled according to the optimal pH value requirements during seed germination (generally 6 to 7). After the vegetation slope protection and restoration project is completed, maintenance and regular inspections are required according to S4.

[0054] j. Lightweight engineering: Based on the green, high-performance solid waste-based stabilized soil obtained in S3, a lightweight green, high-performance solid waste-based stabilized soil project has been achieved. This technical method requires the introduction of a foaming agent and its integration with traditional lightweight soil technology. Secondary reactions with solid waste-based cementitious materials must also be avoided to achieve the goal of reducing the weight of the solid waste-based stabilized soil. After the solid waste-based lightweight soil project is completed, maintenance and regular inspections are required according to S4.

[0055] k. Ecological road project: Based on the green, high-performance solid waste-based solidified soil obtained in S3, combined with the rolling and solidification collaborative process, an ecological road project using green, high-performance solid waste-based compressed solidified soil has been realized. This technology uses a layered paving process to form a permeable road base through vibration compaction equipment, and the surface layer can be composited with ecological paving materials. During construction, the porosity and permeability coefficient must be controlled, and a drainage blind ditch system must be set up according to specifications. It is particularly suitable for the construction of park trails, scenic area ecological corridors, and low-load traffic roads in sponge cities. After the completion of the ecological road project, maintenance and regular inspections are required according to S4.

[0056] 1. Foundation reinforcement project: Based on the green, high-performance solid waste-based solidified soil obtained in S3, a foundation reinforcement project using green, high-performance solid waste-based solidified soil has been realized. This technology uses a mixing head construction technique or a mixing pile equipment construction process to inject the solidified soil into the soft base layer through a grouting system, and uses mixing equipment to ensure its uniform distribution. The grouting pressure should be precisely controlled according to the depth of the soil layer, and the diffusion radius is adjusted by adding an appropriate amount of thickener. If needed, after the foundation reinforcement project is completed, maintenance and regular inspections can be carried out according to S4.

[0057] m. Grouting reinforcement engineering (oil well engineering pressure injection, tunnel grouting, underground engineering grouting): Based on the green, high-performance solid waste-based solidified soil obtained in S3, a grouting reinforcement project for this green, high-performance solid waste-based solidified soil was implemented. This technology includes: ① Using a casing outer annular pressure injection process to control the initial setting time and final setting strength of the solidified soil; ② Using segmented forward grouting with grouting holes arranged in a plum blossom pattern; and ③ Using sleeve valve tube grouting technology in underground projects to control the grouting rate. A high-pressure grouting pump and automatic recorder are required during construction. After the grouting reinforcement project is completed, maintenance and regular inspections should be carried out according to S4 as needed.

[0058] n.Low carbon concrete engineering: Based on the green, high-performance solid waste-based solidified soil obtained in S3, a low-carbon concrete project using green, high-performance solid waste-based solidified soil has been realized. This technology replaces traditional cement with solid waste-based materials to produce low-carbon concrete using a mixer. The mix design complies with the "Technical Specifications for Green Concrete," reducing carbon emissions by 40%-60% compared to traditional concrete. It is suitable for scenarios such as certified buildings and zero-carbon parks. After the low-carbon concrete project is completed, maintenance and regular inspections are required according to S4.

[0059] o. Artificial reef projects: Based on the green, high-performance solid waste-based solidified soil obtained in S3, an artificial reef project using green, high-performance solid waste-based solidified soil has been realized. This technology uses a prefabrication process to produce porous cubic or special-shaped components through steel mold forming. The component porosity is designed to be 30% to 40%, and the surface roughness Ra ≥ 50μm to promote the attachment of marine organisms. The GPS positioning system is used during sinking, and the artificial reefs are arranged in a matrix with spacing of 50 to 100 meters. After the completion of the artificial reef project, maintenance and regular inspections are required according to S4.

[0060] p. High-standard farmland construction project: Based on the green, high-performance solid waste-based stabilized soil generated in S3, high-standard farmland construction using this green, high-performance solid waste-based stabilized soil has been realized. This technology, specifically designed for mechanized farming roads, utilizes a "three-in-one soil" structural layer design. Construction utilizes a laser grader and a paving roller. This technology is suitable for applications such as protecting black soil in Northeast China and paddy fields in southern China. After completing the high-standard farmland construction project, maintenance and regular inspections are required according to S4.

[0061] q.3D printing project: Based on the green, high-performance solid waste-based stabilized soil obtained using S3, a 3D printing project has been realized. This technology improves the material's rheological properties and utilizes a six-axis robotic arm printing system to achieve layer-by-layer buildup. This technology controls the porosity of the printed structure and the interlayer bond strength. This technology is suitable for the construction of special-shaped structures such as landscape sculptures and building facades. After the 3D printing project is completed, maintenance and regular inspections are required according to S4.

[0062] r. Man-made building materials: Based on the green, high-performance solid waste-based solidified soil obtained in S3, a green, high-performance artificial building material project using solid waste-based solidified soil has been realized. This technology covers: ① Standard bricks are molded using compression molding; ② Hollow blocks are formed using vibration molding; ③ Decorative panels utilize an autoclave curing process that leverages the material's compression-curing properties. After the artificial building material project is completed, maintenance and regular inspections are required according to S4.

[0063] The present invention proposes a green, high-performance solid waste-based cementitious material, its preparation method, and application. Compared with existing similar materials, the green, high-performance solid waste-based cementitious material of the present invention has the following advantages: (1) The green high-performance solid waste-based cementitious material provided by the present invention is prepared from cement clinker, desulfurized gypsum, quicklime, slag powder, red mud, manganese slag, carbide slag, fly ash, alkali slag, activator and the like in different proportions. By changing the proportions, the effective utilization of solid waste can be achieved, which promotes the efficient resource conversion of solid waste and significantly reduces carbon dioxide emissions in the high-energy consumption clinker production process.

[0064] (2) The green high-performance solid waste-based cementitious material provided by the present invention is composed of cement clinker, desulfurized gypsum, quicklime, slag powder, red mud, manganese slag, carbide slag, fly ash, alkali slag, activator, etc., and the preparation process is similar to that of cement. In actual construction, cement clinker, desulfurized gypsum, quicklime, slag powder, red mud, manganese slag, carbide slag, fly ash, alkali slag, activator, etc. are sequentially put into a mixer according to the formula and stirred evenly. The grouting raw materials are mixed with 0-2 parts of activator and stirred evenly to obtain a green high-performance solid waste-based cementitious material. By mixing green high-performance solid waste-based cementitious materials with different dosages of 5%, 10%, and 15% with water contents of 40%, 60%, and 80%, a green high-performance solid waste-based solidified soil is obtained. During the hydration reaction, the material fully considers the synergistic effect of calcium-aluminosilicate, and combines the activation effect of the activator on the active ingredients, giving the material the characteristics of high early strength, excellent impermeability, and good corrosion resistance.

[0065] (3) The green, high-performance solid waste-based cementitious material provided by the present invention can be widely used in road engineering, underground cementitious filling, building construction, 3D printing buildings, water conservancy hubs, nuclear power plant construction and national defense projects. Compared with traditional cement-based cementitious materials, the green, high-performance solid waste-based cementitious material of the present invention has lower energy consumption, pollution and cost, and has better durability. Compared with the existing technology, the green, high-performance solid waste-based cementitious material of the present invention shows advantages such as stable performance, high early strength and easy operation.

[0066] (4) The green high-performance solid waste-based cementitious material provided by the present invention has the characteristics of low carbon, high strength, stable setting time, fluidity and other performance indicators, and meets the national standard for the initial setting (>45 min) and final setting (<600 min) time requirements of silicate cement. The advantages of green high-performance solid waste-based cementitious materials are that they promote the environmentally friendly reuse of industrial by-products and waste, reducing the demand for the mining of traditional natural resources such as limestone; their production process has low energy consumption, reducing CO2 emissions in cement production, and helping to minimize the carbon footprint of the construction industry; at the same time, green high-performance solid waste-based cementitious materials are cost-effective because they utilize low-cost industrial waste and the high proportion of solid waste in the raw materials greatly reduces production costs; in terms of performance, through chemical excitation and microstructure regulation, they can achieve mechanical properties and durability similar to or even better than ordinary silicate cement; in addition, green high-performance solid waste-based cementitious materials support circular economy and sustainable development policies, may obtain policy benefits, promote technological innovation in the field of materials science, and provide efficient and environmentally friendly alternative materials for green building and infrastructure construction.

[0067] (5) The green high-performance solid waste-based cementitious material provided by the present invention can be combined with soils of different moisture contents and different types, and can be used in mine restoration, pipeline corridors, foundation pits, fertilizer troughs, "three back" filling, road construction, foundation leveling, soil restoration, foundation engineering, sludge treatment, foundation reinforcement, grouting reinforcement, artificial building materials, artificial reefs, high-standard farmland construction, ecological roads, landscaping and construction engineering, etc., especially in complex engineering scenarios such as confined space operations, processing of special-shaped and heterogeneous structures, deep backfilling, high-standard backfilling quality requirements, difficulty in material transportation, underwater construction environment and tight construction period.

[0068] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A green, high-performance solid waste-based cementitious material, characterized in that: The invention is composed of the following raw materials in parts by weight: 15-25 parts of cement clinker, 15-25 parts of desulfurized gypsum, 0-5 parts of quicklime, 50-60 parts of slag powder, 0-18 parts of red mud, 0-10 parts of manganese slag, 0-10 parts of calcium carbide slag, 0-15 parts of fly ash, 0-10 parts of alkali residue and 0-2 parts of activator.

2. The green high-performance solid waste-based cementitious material according to claim 1, characterized in that: The cement clinker, desulfurized gypsum, quicklime, slag powder, red mud, manganese slag, carbide slag, fly ash and alkali slag are all dried and then ground to the required fineness by a grinding machine for later use.

3. The green high-performance solid waste-based cementitious material according to claim 1, characterized in that: The red mud powder is a gel material.

4. The green high-performance solid waste-based cementitious material according to claim 1, characterized in that: The cement clinker is a fine powder obtained by crushing and refining slag, and the slag includes iron slag, copper slag, and aluminum slag.

5. The green high-performance solid waste-based cementitious material according to claim 1, characterized in that: The slag powder often includes iron slag, copper slag, and aluminum slag.

6. The green high-performance solid waste-based cementitious material according to claim 1, characterized in that: The manganese slag is industrial waste generated during the processing of manganese ore, and its main components include water-soluble salt compounds of manganese sulfate and ammonium sulfate and heavy metal ions of zinc, nickel and cobalt.

7. The green high-performance solid waste-based cementitious material according to claim 1, characterized in that: The activator includes sodium silicate, sodium carbonate, triethanolamine, sodium sulfate, citric acid, calcium chloride and sodium hydroxide.

8. A method for preparing a green, high-performance solid waste-based cementitious material according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. According to the formula, cement clinker, desulfurized gypsum, quicklime, slag powder, red mud, manganese slag, carbide slag, fly ash, alkali residue are sequentially put into the mixer and mixed evenly as grouting raw materials; S2. Mix the grouting raw materials and the activator and stir them evenly to obtain a green high-performance solid waste-based cementitious material.

9. The method for preparing green high-performance solid waste-based cementitious materials according to claim 8, characterized in that: The stirring time in step S1 is at least 4 minutes.

10. An application of a green, high-performance solid waste-based cementitious material, characterized in that: Including steps: S3. Mixing the green, high-performance solid waste-based cementitious material according to any one of claims 1 to 7 with a water-containing soil to obtain a green, high-performance solid waste-based solidified soil; pouring the green, high-performance solid waste-based solidified soil, and applying it to mine filling, bagged solidified soil filling and enclosure, culvert backfill, roadbed pouring, platform backfill, vertical roadbed reconstruction and expansion, slope embankment filling, cofferdam pouring, vegetation slope protection and restoration, lightweight engineering, ecological road engineering, foundation reinforcement engineering, grouting reinforcement engineering, low-carbon concrete engineering, artificial reef engineering, high-standard farmland construction engineering, 3D printing engineering, and artificial building materials; S4. Start curing promptly after pouring green high-performance solid waste-based soil: Covering curing requires covering with straw mats or the like when there is no obvious moisture after the concrete is poured and initially leveled, and keep the covering moist; water curing starts after the final setting of the concrete, and requires watering 2 to 3 times a day until the strength reaches 70% to 80%; spray curing is implemented after final setting, and the frequency is adjusted according to the environment to keep it moist; water storage curing is to immerse the components in water and maintain the water quality; steam curing is carried out after pouring, controlling the temperature at 60 to 90°C and high humidity to accelerate hardening; humid environment curing relies on natural conditions, ensuring a humidity of not less than 70% and avoiding the influence of extreme climate; chemical curing is to apply chemicals after there is no obvious moisture on the concrete surface, and check regularly.

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