Solid waste-based composite concrete anticorrosive coating and preparation method thereof

Abstract

The invention discloses a solid waste-based composite concrete anticorrosive coating and a preparation method thereof, and relates to the technical field of building materials. The coating is composed of 16%-20% of a component A and 80%-84% of a component B, the component A comprises expanded graphite, novel low-calcium clinker and the like, the component B comprises fine silt, tailings and other solid waste raw materials, and a compact structure is formed through reasonable grain composition and a dual micro-expansion effect. During preparation, the coating with the convex structure is formed through grinding, mixing and roll coating forming. A large amount of industrial solid waste is utilized, and the coating is low-carbon, environmentally friendly, low in cost, excellent in carbonization resistance, ion erosion resistance and bacterial erosion resistance, high in early strength, good in toughness, resistant to cracking, capable of being self-repaired, low in later maintenance cost and capable of achieving multi-factor long-acting protection on concrete and solves the problems that an existing coating is single in protection, poor in economical efficiency and the like.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, and more specifically to a solid waste-based composite concrete anti-corrosion coating and its preparation method. Background Technology

[0002] Concrete, due to its abundant raw materials, low price, and simple production process, has become the most widely used and consumed building material in modern construction. Therefore, improving the durability and strength of concrete has always been a hot topic in practical engineering. Because of its widespread use in civil engineering, concrete is inevitably exposed to various uncertain and complex environments, thus being affected by a combination of physical, chemical, and biological factors. Reasonable design based on the usage environment and proper curing and maintenance can greatly increase the service life of concrete. However, in actual application, various problems such as harsh environmental conditions, unreasonable design, and inadequate construction can drastically reduce the service life of concrete.

[0003] The porous structure of concrete easily absorbs environmental moisture. In cold regions, the freeze-thaw cycle (expansion during freezing and contraction during thawing) is the primary physical mechanism of corrosion. Simultaneously, various chemical corrosive agents (such as sulfates in acidic environments, common chloride ions, carbonization under high CO2 humidity, and acids produced by microbial metabolism) can penetrate into the concrete, triggering complex chemical and biochemical reactions that lead to corrosion. Although corrosion is often a synergistic effect of multiple factors, its core is the penetration of corrosive agents (water, ions, acids, etc.) through the concrete surface and pores. Therefore, effectively blocking the penetration of these corrosive agents is crucial for corrosion prevention.

[0004] Currently, there are two main methods to improve concrete durability and reduce corrosion: one is to add various materials to the concrete to enhance its stability and density, thus improving its internal structure; the other is to apply an anti-corrosion coating to the concrete surface to isolate it from the external environment and provide protection. The first method has limitations: ① Concrete is a porous material, and the addition of additives does not change this structure; ② The addition of additives may affect the strength of the concrete. The second method, applying an anti-corrosion coating to the outer surface of the concrete, is simple to operate and has obvious effects, and is widely used in actual production.

[0005] For example, the published text of invention patent application CN120365777A discloses an antibacterial and anti-corrosion coating material for concrete sewage pipes and its preparation method. Compared to traditional concrete anti-corrosion coating materials, this invention uses a cement-based material modified with aluminum sludge ash as a carrier and incorporates an antibacterial agent as a functional component to prepare a functional antibacterial coating. However, this patent only considers biological erosion, which is usually caused by multiple factors; single-factor protection is ineffective.

[0006] For example, the published text of the invention patent application with application publication number CN117925108A discloses an environmentally friendly concrete composite anti-corrosion coating and its preparation method. It has good hydrophobicity and mechanical stability, and can effectively resist the corrosion of corrosive ions in the marine environment, greatly enhancing the durability of concrete structures. However, this invention uses materials such as tannic acid and silane coupling agents, which are expensive and difficult to promote and apply on a large scale.

[0007] Therefore, providing a concrete anti-corrosion coating that resists multi-factor erosion, has good economic efficiency, and is low-carbon, environmentally friendly, and has a high solid waste utilization rate has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0008] To overcome the defects and shortcomings of the existing technology, this invention provides a solid waste-based composite concrete anti-corrosion coating and its preparation method. The purpose of this invention is to solve the problems of poor protective effect, short protective effect, and poor economy in the existing technology. The anti-corrosion coating provided by this invention makes extensive use of solid waste materials, is low-carbon and environmentally friendly, and has a low cost; it can protect against corrosion from multiple factors, has good protective performance, has a certain degree of self-healing properties, and has a long protection time.

[0009] To address the problems existing in the prior art, the present invention is achieved through the following technical solution.

[0010] The first aspect of this invention provides a solid waste-based composite concrete anti-corrosion coating, comprising, by mass percentage, 16%-20% component A and 80%-84% component B, wherein the sum of the mass percentages of component A and component B is 100%. Component A, by mass, comprises 0.5-1.5 parts expanded graphite, 8-12 parts novel low-calcium clinker, 0.1-0.25 parts grinding aid, 1-2.5 parts gypsum, and 5-8 parts smelting slag; the mineral composition of the novel low-calcium clinker, by mass percentage, comprises 40%-50% dicalcium silicate, 25%-30% calcium sulfoaluminate, 3%-8% calcium sulfosilicate, 3%-8% tetracalcium aluminoferrite, 8%-15% calcium sulfate, and 1%-5% free calcium oxide; Component B, by mass, comprises 25-33 parts fine mud, 24-35 parts tailings, 0.3-0.7 parts latex powder, 15-33 parts silicate cement clinker, and 0.1-0.3 parts water-reducing agent.

[0011] More preferably, the expanded graphite in component A is a worm-like porous carbon material made by chemical or electrochemical intercalation of natural flake graphite followed by high-temperature instantaneous expansion, with a particle size of 0.3mm-0.85mm and an expansion ratio of 200-300 times.

[0012] More preferably, the grinding aid in component A is a triethanolamine-based grinding aid, with a triethanolamine content of 30%-50%.

[0013] More preferably, the gypsum in component A is a mixed gypsum with a calcium sulfate content greater than 70%.

[0014] More preferably, the smelting slag in component A is slag from smelting zinc, aluminum, or magnesium.

[0015] More preferably, the fine mud in component B is waste mud formed by sedimentation of water washing and sludge removal wastewater during the preparation of manufactured sand, with a specific surface area greater than 600 m². 2 / kg.

[0016] More preferably, the tailings in component B are metal ore flotation tailings, with 25%-30% residue on a 200-mesh sieve.

[0017] More preferably, the tricalcium silicate content in the silicate cement clinker of component B is >50%.

[0018] More preferably, the water-reducing agent in component B is a polycarboxylate water-reducing agent with a water reduction rate > 30%.

[0019] The second aspect of this invention provides a method for preparing a solid waste-based composite concrete anti-corrosion coating as described in the first aspect, comprising the following steps: S1. Weigh out expanded graphite, new low-calcium clinker, grinding aid, gypsum, and smelting slag according to the specified weight, mix them evenly, and then put them into a dry ball mill for grinding until the specific surface area is 380-450 m². 2 / kg, with a residue of <5% on an 80μm sieve, component A was obtained; S2. Weigh out the silicate cement clinker by weight and grind it in a dry ball mill until the specific surface area is 220-280 m². 2 / kg, with 80μm sieve residue >30%, to obtain ground silicate cement clinker. The fine mud, tailings, latex powder and water-reducing agent in component B are dried to a moisture content of <5%, and then mixed evenly with component A obtained in step S1 and ground silicate cement clinker to obtain a mixture. S3. Add 0.3-0.4 times the mass of water to the mixture obtained in step S2, mix evenly, and then roll it onto the concrete surface to form a raised structure and complete the anti-corrosion coating of solid waste-based composite concrete.

[0020] Compared with the prior art, the beneficial technical effects of the present invention are as follows: 1. The anti-corrosion coating of this invention exhibits high early strength. The novel low-calcium clinker, rich in calcium sulfoaluminate, has a rapid hydration rate, enabling quick strength formation. The gypsum added to the system significantly promotes the hydration reaction of calcium sulfoaluminate, further enhancing early strength. Simultaneously, the milled novel low-calcium clinker and smelting slag have increased particle size, increasing the surface area in contact with water, which also contributes to early strength growth. Furthermore, triethanolamine, while acting as a grinding aid, also functions as an early strength agent, effectively improving the hydration rate of the entire system. The calcium carbonate microcrystals contained in the washed sand and mud act as crystal nuclei, accelerating the formation of hydration product crystals and significantly promoting early strength.

[0021] 2. The anti-corrosion coating of this invention has a reasonable particle size distribution, consisting of ultrafine particles (expanded graphite, easily broken), fine particles (fine mud), medium particles (new low-calcium clinker, grinding aid, gypsum, smelting slag), and coarse particles (tailings, ordinary clinker), achieving the densest packing. Simultaneously, the colloid formed by the hydration of latex powder and calcium sulfosilicate fully fills the micropores, significantly improving density. Furthermore, a dual micro-expansion effect occurs within the system: calcium sulfoaluminate reacts with gypsum to form ettringite, and free calcium oxide in the new low-calcium clinker undergoes a hydration reaction. These two factors effectively compensate for the chemical shrinkage porosity caused by the consumption of free water during hydration, thereby further increasing the overall density. This dense structure provides a solid strength foundation for the material, while the abundant colloid imparts a certain degree of toughness to the system. In large-area protective applications, this combination effectively prevents cracking of the protective layer caused by concrete deformation.

[0022] 3. The anti-corrosion coating of the present invention has good anti-carbonation performance and high density, which can effectively block the penetration of corrosive gases. Moreover, the calcium sulfosilicate rich in the new low-calcium clinker, after hydration, generates colloids that easily react with carbon dioxide to form calcium carbonate crystals, consuming a large amount of carbon dioxide. At the same time, the generated crystals can further improve the density of the system, thereby significantly improving the anti-carbonation performance. The system also contains a large amount of carbonation-active minerals such as slag, calcium sulfoaluminate, dicalcium silicate, and tricalcium silicate. The hydration products of these minerals can also consume a large amount of carbon dioxide, effectively preventing carbon dioxide from entering the interior of the anti-corrosion layer and eroding the concrete.

[0023] 4. The anti-corrosion coating of the present invention has excellent resistance to ion erosion. Tailings, slag and graphite all have good electrical conductivity, which gives the anti-corrosion coating conductivity, allowing electrons to migrate freely in it and effectively inhibiting ion migration, thereby avoiding damage to the concrete and anti-corrosion layer structure. At the same time, the metallic lead and zinc in the slag can act as an oxidizing agent, forming a dual protection mechanism, further enhancing the resistance to ion erosion.

[0024] 5. The anti-corrosion coating of the present invention has good anti-bacterial erosion performance, and the dense structure effectively prevents bacteria and their secretions from entering the concrete interior; the tailings contain a large amount of mineral processing agent residues such as xanthate, and the slag also contains a large amount of heavy metals, which can effectively kill bacteria and prevent bacteria from multiplying on the anti-corrosion layer and concrete surface and eroding the internal structure of the concrete.

[0025] 6. The anti-corrosion coating of this invention has low maintenance costs in the later stages. The polyacrylamide rich in the fine mud is a highly efficient water-retaining agent. Combined with the hydrophilic substances such as xanthate and polycarboxylate superplasticizer in the tailings, and the excellent water absorption of the surface protrusion structure, the anti-corrosion coating is ensured to have sufficient moisture to achieve self-curing. At the same time, the optimized particle size distribution and the synergistic effect of limestone and water-reducing agent significantly reduce the overall water consumption of the system. The large amount of unhydrated coarse clinker in the system acts as a potential active aggregate. When micro-cracks appear in the coating, it can absorb the moisture captured from the air by the water-retaining agent of the fine mud and the hydrophilic structure, hydrating to generate hydrated calcium silicate gel and crystals, realizing rapid setting and repair of cracks, and synergistically achieving self-curing and self-repair functions. At the same time, the good water retention performance can effectively prevent the old concrete from absorbing water, which would cause the anti-corrosion coating to lose water and reduce the adhesion between the coating and the concrete. The good expansion performance of the anti-corrosion coating can also stabilize its own structure and prevent the stress at the interface between the old and new layers caused by hydration shrinkage, which would reduce the adhesion performance. In addition, the redispersible latex powder and the colloid generated by the hydration of calcium sulfosilicate can further increase the adhesion performance of the coating.

[0026] 7. Compared with organic anti-corrosion coatings, this invention has better durability, and the inorganic material has good high temperature resistance and fire resistance. Expanded graphite is also a good flame retardant. Compared with inorganic anti-corrosion coatings, this product has better density and toughness, better crack resistance, and can quickly self-repair after cracking. Attached Figure Description

[0027] Figure 1 This is a schematic diagram illustrating the construction of the solid waste-based composite concrete anti-corrosion coating of the present invention. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to specific embodiments. These embodiments are only used to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0029] The raw materials used in this invention (except for the novel low-calcium clinker) are all conventional commercially available products or industrial solid waste recycled products. The novel low-calcium clinker is self-developed and prepared according to the set mineral composition ratio, and all performance indicators meet the design requirements. The other raw materials all meet the corresponding preferred parameter standards. For example, the grinding aid is a triethanolamine-based grinding aid, and the triethanolamine content is controlled between 30% and 50%. The gypsum in component A is mixed gypsum with a calcium sulfate content of 75%. The smelting slag in component A is zinc smelting slag (slag from magnesium or aluminum smelting can also be selected). The fine mud is waste mud formed by the sedimentation of water washing and desliming wastewater during the preparation of manufactured sand, with a specific surface area of ​​610 m². 2 / kg; the tailings are flotation tailings of metallic ores (such as pyrite, chalcopyrite, etc., pyrite is selected in this embodiment), with a residue of 25%-30% on a 200-mesh sieve. The tricalcium silicate content in the silicate cement clinker is 55%; the water-reducing agent is a polycarboxylate water-reducing agent with a water reduction rate >30%.

[0030] This invention provides 5 sets of embodiments, and the raw material composition of the special cementitious material for anti-corrosion concrete in each embodiment is shown in Table 1 below: Table 1 shows the raw materials for solid waste-based composite concrete anti-corrosion coatings (unit: kg).

[0031] The mineral composition of the novel low-calcium clinker used in the above five examples is shown in Table 1-1 below: Table 1-1 Mineral composition of the new low-calcium clinker (mass percentage: %)

[0032] The preparation method of the solid waste-based composite concrete anti-corrosion coating in the above embodiments is as follows: S1. Weigh out expanded graphite, new low-calcium clinker, grinding aid, gypsum and smelting slag according to the proportions in Table 1 and Table 1-1 above, mix them evenly and put them into a dry ball mill for grinding. Control the specific surface area of ​​the material after grinding to be 380-450m² / kg and the residue on the 80μm sieve to be <5% to obtain component A.

[0033] S2. Weigh the silicate cement clinker according to the proportions in Table 1 above, and grind it in a dry ball mill until the specific surface area is 220-280 m². 2 / kg, with 80μm sieve residue >30%, to obtain ground silicate cement clinker. The fine mud, tailings, latex powder and water-reducing agent in component B are dried to a moisture content of <5%, and then mixed evenly with component A obtained in step S1 and ground silicate cement clinker to obtain a mixture. S3. Add 0.3-0.4 times the mass of water to the mixture obtained in step S2, mix evenly, and then roll it onto the concrete surface to form a raised structure and complete the anti-corrosion coating of solid waste-based composite concrete.

[0034] The key parameters for each embodiment are shown in Table 2 below.

[0035] Table 2 shows the preparation parameters of the anti-corrosion coating for solid waste-based composite concrete in each embodiment.

[0036] The anti-corrosion coatings obtained in Examples 1-5 were applied to the surface of concrete test blocks using a roller brush process to prepare test specimens.

[0037] Uncoated concrete blocks (150mm*150mm*150mm) and concrete blocks coated with the coating from Examples 1-5 (150mm*150mm*150mm) were placed together in a carbonation chamber with a carbon dioxide concentration of 20%, humidity of 70%, and temperature of 20℃ for 48 hours. The carbonation depth of the concrete was then tested according to GB / T50082-2009 "Standard for Test Methods of Long-Term Performance and Durability of Ordinary Concrete". Simultaneously, uncoated concrete blocks and concrete blocks coated with the coating from Examples 1-5 were immersed in standard seawater for 200 days to test the chloride and sulfate ion content in the concrete blocks and to detect the corrosion resistance of the anti-corrosion coating. The above-mentioned blocks were then placed in artificially prepared enhanced wastewater with an SCOD of 3000±200 (mg / L) ten times its normal concentration for accelerated microbial corrosion testing. The test results are shown in Table 3 below.

[0038] Table 3 shows the experimental data of the concrete test blocks.

[0039] The experimental results in Table 3 above show that: (I) Analysis of resistance to carbonization: —The control sample was not coated with an anti-corrosion coating. The porous structure inside the concrete could not prevent CO2 penetration. CO2 reacted with the cement hydration products to form a carbonation reaction, resulting in a carbonation depth of 21.2 mm. The internal structure of the concrete was prone to problems such as reduced strength and cracking due to carbonation.

[0040] —The carbonization depth of Examples 1-5 was significantly lower than that of the control sample, with a reduction of 74.0%-83.5%, indicating that the anti-corrosion coating of the present invention has excellent anti-carbonization performance. Among them, Example 5 had the smallest carbonization depth (3.5 mm). The core reason for this is that the novel low-calcium clinker in this example has a calcium sulfosilicate content of 8% (Table 1-1), and the coating has optimized particle size distribution and higher density. It can both block CO2 penetration through its dense structure and consume a large amount of CO2 through the hydration products of carbonization-active minerals such as calcium sulfosilicate. Under the dual effect, the anti-carbonization effect is optimal. The carbonization depth of Example 3 was 4.1 mm, which was slightly higher than that of Example 5, but still far better than the control sample. Its novel low-calcium clinker had a high dicalcium silicate content (48%), and the dicalcium silicate hydration products also have strong carbonization reactivity, which can help improve the anti-carbonization ability.

[0041] (II) Analysis of resistance to chloride ion corrosion: —In contrast to the unprotected sample, chloride ions from seawater can easily penetrate freely through the pores of concrete, resulting in a chloride ion content as high as 1.22g. Chloride ions can cause corrosion of the steel bars inside the concrete and damage the integrity of the concrete structure.

[0042] —The chloride ion content in Examples 1-5 was only 15.4%-23.3% of the control sample, demonstrating a significant protective effect and highlighting the coating's strong barrier against chloride ion corrosion. Example 5 had the lowest chloride ion content (0.188g) because the amount of smelting slag (zinc slag) added in this example was reasonable. The metallic lead and zinc in the slag formed an oxidation protective barrier, while the tailings and graphite imparted good conductivity to the coating, inhibiting chloride ion migration. The dual protective mechanism worked synergistically. Example 3 had a chloride ion content of 0.239g, with a tailings addition of 35kg (Table 1). The high conductivity of the tailings further enhanced the inhibition of chloride ion migration, maintaining a high level of resistance to ion corrosion.

[0043] (III) Analysis of resistance to sulfate ion attack: —The control sample was not treated with anti-corrosion measures. Sulfate ions in seawater can easily penetrate into the concrete and react with cement hydration products to generate expansive substances, causing the concrete to crack and peel off. The sulfate ion content reached 1.58g.

[0044] —The sulfate ion content in Examples 1-5 was significantly reduced, only 15.3%-23.2% of the control sample, indicating that the anti-corrosion coating of the present invention can effectively block sulfate ion penetration. Example 5 had the lowest sulfate ion content (0.242g). Similar to the chloride ion protection mechanism, its dense coating structure, conductive migration inhibition, and oxidation protection barrier worked together to achieve the best blocking effect on sulfate ions (anions). The sulfate ion content in Example 2 was 0.332g, which was higher than that in Example 5, but still 79.0% lower than the control sample, meeting the anti-corrosion requirements in harsh marine environments. Its novel low-calcium clinker had a calcium sulfoaluminate content of 30% (Table 1-1). The hydration products of calcium sulfoaluminate can react with the small amount of sulfate ions that penetrate, reducing their damage to concrete.

[0045] (iv) Analysis of resistance to bacterial erosion: —In contrast, in the microbial corrosive environment of enhanced wastewater, bacteria and their metabolites eroded the surface and interior of concrete, resulting in a quality loss of 22.15% and serious damage to the integrity of the concrete structure.

[0046] —The mass loss rates of Examples 1-5 were all controlled between 10.32% and 13.21%, a decrease of 40.3%-53.4% ​​compared to the control samples, indicating that the coating has excellent antibacterial corrosion performance. Example 5 had the lowest mass loss (10.32%). On the one hand, its coating has high density, which can physically block the invasion of bacteria and secretions; on the other hand, the residues of mineral processing agents such as xanthate in the tailings and the heavy metals in the slag synergistically exert a bactericidal effect, inhibiting bacterial reproduction. Under this dual protection, the antimicrobial corrosion effect is optimal. The mass loss of Example 3 was 11.66%. Its tailings addition amount was the highest (35kg), and the content of mineral processing agent residues was relatively higher, resulting in a more prominent bactericidal effect. Therefore, the mass loss rate was lower than that of Examples 1, 2, and 4.

[0047] The above four key performance tests show that the solid waste-based composite concrete anti-corrosion coating of the present invention can effectively resist damage from multiple factors such as carbonation, ion erosion, and microbial corrosion. All performance indicators are significantly better than those of the uncoated comparative sample. Among them, Example 5 has the best comprehensive anti-corrosion performance. The synergistic effect of its component ratio (8% calcium sulfosilicate content in the new low-calcium clinker, reasonable addition of smelting slag, and optimized tailings usage) and preparation process parameters (high coating density) achieves all-round and long-term protection for concrete, verifying the design goals of the present invention: "prevention of multi-factor erosion, long-lasting protective effect, good economy, and low carbon and environmental protection".

Claims

1. A solid waste-based composite concrete anti-corrosion coating, characterized in that: By mass percentage, it includes 16%-20% component A and 80%-84% component B, and the sum of the mass percentages of component A and component B is 100%. Component A, by mass, comprises 0.5-1.5 parts expanded graphite, 8-12 parts novel low-calcium clinker, 0.1-0.25 parts grinding aid, 1-2.5 parts gypsum, and 5-8 parts smelting slag; the mineral composition of the novel low-calcium clinker, by mass percentage, comprises 40%-50% dicalcium silicate, 25%-30% calcium sulfoaluminate, 3%-8% calcium sulfosilicate, 3%-8% tetracalcium aluminoferrite, 8%-15% calcium sulfate, and 1%-5% free calcium oxide; Component B, by mass, comprises 25-33 parts fine mud, 24-35 parts tailings, 0.3-0.7 parts latex powder, 15-33 parts silicate cement clinker, and 0.1-0.3 parts water-reducing agent.

2. The solid waste-based composite concrete anti-corrosion coating as described in claim 1, characterized in that: The expanded graphite in component A is a worm-like porous carbon material made by chemical or electrochemical intercalation of natural flake graphite followed by high-temperature instantaneous expansion. Its particle size is 0.3mm-0.85mm and its expansion ratio is 200-300 times.

3. The anti-corrosion coating for solid waste-based composite concrete as described in claim 1, characterized in that: The grinding aid in component A is a triethanolamine-based grinding aid, with a triethanolamine content of 30%-50%.

4. The anti-corrosion coating for solid waste-based composite concrete as described in claim 1, characterized in that: The gypsum in component A is a mixed gypsum with a calcium sulfate content greater than 70%.

5. The anti-corrosion coating for solid waste-based composite concrete as described in claim 1, characterized in that: The smelting slag in component A is slag from smelting zinc, aluminum, or magnesium.

6. The anti-corrosion coating for solid waste-based composite concrete as described in claim 1, characterized in that: The fine mud in component B is waste mud formed by sedimentation of water washing and sludge removal wastewater during the preparation of manufactured sand, with a specific surface area greater than 600 m². 2 / kg.

7. The anti-corrosion coating for solid waste-based composite concrete as described in claim 1, characterized in that: The tailings in component B are metal ore flotation tailings, with 25%-30% residue on a 200-mesh sieve.

8. The anti-corrosion coating for solid waste-based composite concrete as described in claim 1, characterized in that: The tricalcium silicate content in the silicate cement clinker of component B is >50%.

9. The anti-corrosion coating for solid waste-based composite concrete as described in claim 1, characterized in that: The water-reducing agent in component B is a polycarboxylate water-reducing agent with a water reduction rate >30%.

10. A method for preparing a solid waste-based composite concrete anti-corrosion coating as described in any one of claims 1-9, characterized in that it includes the following steps: S1. Weigh out expanded graphite, new low-calcium clinker, grinding aid, gypsum and smelting slag by mass, mix them evenly and put them into a dry ball mill for grinding until the specific surface area is 380-450m2 / kg and the residue on the 80μm sieve is <5%, to obtain component A. S2. Weigh the silicate cement clinker according to the mass fraction, put it into a dry ball mill for grinding until the specific surface area is 220-280m2 / kg and the 80μm sieve residue is >30%, and obtain the ground silicate cement clinker. Dry the fine mud, tailings, latex powder and water-reducing agent in component B to the moisture content <5%, and then mix them evenly with component A obtained in step S1 and the ground silicate cement clinker to obtain a mixture. S3. Add 0.3-0.4 times the mass of water to the mixture obtained in step S2, mix evenly, and then roll it onto the concrete surface to form a raised structure and complete the anti-corrosion coating of solid waste-based composite concrete.

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