Special cementing material for anticorrosive concrete and preparation method of special cementing material

Abstract

The invention discloses a special cementing material for anticorrosive concrete and a preparation method of the special cementing material, and relates to the technical field of building materials. The cementing material is prepared from the following components in parts by mass: 1 to 4 parts of candy pomace, 15 to 25 parts of tailings, 0.5 to 1.5 parts of a water reducing agent, 8 to 18 parts of furnace slag, 25 to 35 parts of novel low-calcium clinker, 3 to 9 parts of white mud, 2 to 6 parts of micro-plastic, 3 to 8 parts of titanium gypsum and 15 to 25 parts of aluminoferrite cement clinker, the mineral composition of the novel low-calcium clinker comprises 40%-50% of dicalcium silicate, 25%-30% of calcium sulphoaluminate, 3%-8% of calcium sulphosilicate, 3%-8% of tetra calcium aluminoferrite, 8%-15% of calcium sulfate and 1%-5% of free calcium oxide. A large amount of industrial solid waste is consumed, and the method has the advantages of being low in carbon, environmentally friendly and low in cost; through the synergistic effect of micro-expansion, close packing, conductive retardation and self-sealing carbonization, efficient comprehensive protection against various corrosion factors is achieved; the self-repairing and self-compacting capabilities are realized, so that the service life of a concrete structure in a harsh environment is remarkably prolonged.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, and more specifically to a special cementitious material for anti-corrosion concrete and its preparation method. Background Technology

[0002] As the most widely used building material globally, concrete's durability directly determines the safe service life and total life-cycle economic cost of infrastructure. Under harsh conditions such as marine erosion, de-icing salt effects, acidic soil corrosion, and industrial pollution, steel reinforcement corrosion and matrix deterioration within concrete structures have become the primary causes of performance degradation and premature failure. Currently, with economic development increasingly reliant on maritime trade and coastal construction, the development of protective concrete technologies with superior durability and corrosion resistance has become a core focus of attention for both academia and industry in the building materials field.

[0003] For example, the invention patent application with publication number CN118598623A discloses an all-solid-waste anti-corrosion concrete and its preparation method. This technology uses industrial solid waste as all raw materials, which not only saves natural mineral resources and reduces the ecological damage caused by mining, but also solidifies the toxic and harmful ions in solid waste into the concrete, realizing the resource utilization of solid waste. It has the advantages of high solid waste utilization rate and excellent mechanical and anti-corrosion properties. However, in order to ensure the anti-corrosion effect, this invention requires the addition of a large amount of trisiloxane-based anti-corrosion agent, which increases the overall cost. At the same time, its overall water-cement ratio is relatively high, and the internal pores formed after the hydration reaction are still a weak link in anti-corrosion. It fails to fundamentally solve the technical problem of low-cost long-term anti-corrosion.

[0004] For example, patent application CN120841913A discloses a high-performance anti-corrosion concrete for marine engineering and its preparation method. By optimizing the formula, it improves the concrete's resistance to chloride ion penetration and sulfate corrosion, enhancing its structural stability and service life in marine environments. However, this technology has significant shortcomings: on the one hand, it relies on the density of sulfoaluminate cement, supplemented by a large amount of corrosion inhibitors to enhance the anti-corrosion effect; however, it is common knowledge in the field that sulfoaluminate cement is not resistant to carbonation. On the other hand, the hydration products of sulfoaluminate cement are weakly alkaline, failing to fully activate the activity of admixtures such as fly ash and silica fume, resulting in insufficient later-stage strength growth and rapid durability degradation of the concrete, making it difficult to achieve long-term anti-corrosion goals.

[0005] For example, patent application CN119100641A discloses an anti-corrosion concrete additive and its preparation method. This additive improves the overall performance of concrete through the synergistic effect of multiple components: fly ash fills internal pores to optimize the microstructure, modified plant fibers enhance mechanical properties and crack resistance, amphoteric polycarboxylate superplasticizer balances workability and the formation of a protective film on the steel reinforcement surface, and inorganic salts further enhance impermeability. However, this technology relies on the single action path of the anti-corrosion agent, resulting in limited anti-corrosion improvement. Furthermore, its resistance to ionic erosion is prone to deterioration during long-term service, making it difficult to meet the long-term anti-corrosion requirements under harsh environments.

[0006] In summary, existing technologies (including but not limited to the aforementioned patents) primarily focus on single dimensions such as concrete mix design optimization and anti-corrosion additive development, generally exhibiting common shortcomings such as limited functionality, isolated mechanisms, and passive defense. These technologies either focus solely on densely filling internal pores, individually enhancing anti-corrosion functions, or only addressing shrinkage compensation, failing to organically synergize and integrate multiple anti-corrosion mechanisms. Therefore, developing a specialized cementitious material that integrates multiple protective mechanisms to fundamentally solve the problem of concrete corrosion has become an urgent need and an important direction for technological breakthroughs in this field. Summary of the Invention

[0007] To overcome the defects and shortcomings of the existing technology, this invention provides a special cementitious material for anti-corrosion concrete and its preparation method. The purpose of this invention is to overcome the deficiencies of existing technologies, such as a single anti-corrosion mechanism, reliance on expensive raw materials, and insufficient long-term durability. The special cementitious material for anti-corrosion concrete prepared by this invention has the following significant advantages: I. Resource and cost advantages: It can dispose of large quantities of industrial solid waste, combining low carbon and environmental protection with low cost. II. Performance advantages: Through the synergistic effect of micro-expansion, dense packing, conductive resistance hysteresis and self-sealing carbonization, it achieves efficient comprehensive protection against a variety of corrosive factors; III. Long-term advantages: It has the ability to self-repair and self-compact, thus significantly extending the service life of concrete structures in harsh environments.

[0008] To address the problems existing in the prior art, the present invention is achieved through the following technical solution.

[0009] The first aspect of this invention provides a special cementitious material for anti-corrosion concrete, which comprises the following components by weight: 1-4 portions of sugar residue; 15-25 portions of tailings; 0.5-1.5 parts water-reducing agent; 8-18 parts slag; 25-35 parts of the new low-calcium clinker; 3-9 parts white clay; 2-6 parts microplastics; 3-8 parts titanium plaster; 15-25 parts of aluminoferrite cement clinker; The mineral composition of the novel low-calcium clinker, by mass percentage, includes: 40%-50% dicalcium silicate; 25%-30% calcium sulfoaluminate; 3%-8% calcium sulfosilicate; 3%-8% Tetracalcium aluminoferrite; 8%-15% calcium sulfate; 1%-5% free calcium oxide.

[0010] More preferably, the sugar residue is the fibrous residue remaining after sugarcane or sugar beet is pressed to extract sugar juice, with a moisture content of <10%, a length of 10-30mm, an aspect ratio of 50-150, and a cellulose content of >50%.

[0011] More preferably, the tailings are cryptocrystalline graphite flotation tailings with a moisture content of <5%.

[0012] More preferably, the water-reducing agent is a polycarboxylate high-performance water-reducing agent with a water reduction rate > 25%.

[0013] More preferably, the slag is slag from the smelting of zinc, aluminum or magnesium.

[0014] More preferably, the slag is slag from zinc smelting.

[0015] More preferably, the white mud is a solid waste generated by the papermaking industry, with a calcium carbonate content >90% and a sodium hydroxide content >0.3%.

[0016] More preferably, the microplastics are made by crushing the processed plastic waste into fine particles with a particle size of 0.5-5 mm.

[0017] More preferably, the titanium gypsum is a solid waste byproduct of the titanium dioxide industry, and its calcium sulfate dihydrate content is >90%.

[0018] More preferably, the aluminoferrite cement clinker is aluminoferrite cement clinker conforming to the GB / T45920-2025 standard "Aluminoferrite Cement", with an iron oxide content >7% and an alumina content >25%.

[0019] The second aspect of this invention provides a method for preparing a special cementitious material for anti-corrosion concrete as described in the first aspect, comprising the following steps: S1. Weigh out sugar residue and white mud according to the mass fractions, mix them thoroughly, and dry them at low temperature after full reaction to obtain material A; S2. Weigh out titanium gypsum, slag, and new low-calcium clinker according to the specified mass fractions, and grind them together with material A obtained in step S1, controlling the specific surface area to be 380-420 m². 2 / kg, yielding material B; S3. Weigh the tailings and water-reducing agent according to the mass fractions, grind them, and control the specific surface area to be 550-620m². 2 / kg; Material C is obtained; S4. Weigh out the microplastic and aluminoferrite cement clinker according to the specified mass fractions, grind it, and control the specific surface area to be 230-280 m². 2 / kg, yielding material D; S5. After mixing materials B, C and D evenly, the special cementitious material for anti-corrosion concrete is obtained.

[0020] Compared with the prior art, the beneficial technical effects of the present invention are as follows: 1. This technical solution achieves compact packing of cementitious material particles by specifically controlling the fineness of raw materials, effectively reducing the porosity of the system. Calcium sulfoaluminate and titanium gypsum in the novel low-calcium clinker work synergistically during hydration, producing moderate expansion to compensate for slurry hydration shrinkage. Simultaneously, the calcium carbonate micropowder in the white mud and the graphite in the tailings act as synergistic water-reducing agents, reducing the pore water content of the slurry and further improving density; the graphite powder and calcium carbonate micropowder can also fill micropores, enhancing structural compactness. Furthermore, sugar residue and microplastics, acting as highly efficient retarders, combined with the hydrophobic properties of graphite, slow down the slurry setting process, preventing temperature cracks caused by excessive internal and external temperature differences due to concentrated hydration heat release, while also preventing excessive growth of ettringite crystals, ensuring the long-term stability of the material structure.

[0021] 2. Dense slurry and low water consumption lay the foundation for strength development. The calcium sulfoaluminate and tetracalcium ferroaluminate in aluminoferrite cement clinker, as well as the calcium sulfoaluminate in new low-calcium clinker, work synergistically with titanium gypsum, resulting in a rapid hydration rate and quick early strength formation. Dicalcium silicate in the clinker hydrates relatively slowly, but its hydration products are more dense, providing stable support for later strength development. The higher alkalinity provided by the white mud synergistically activates the aluminous active components in the slag and tailings by releasing the alkalinity from the aforementioned hydration products. Under these alkaline conditions, the slag generates a dense C-(N)-ASH gel, which fills the pores between ettringite particles, forming a composite reinforcement system and thus improving later strength. Simultaneously, the higher alkalinity also promotes the reaction of the Al2O3 gel released from the hydration of calcium sulfoaluminate with Ca(OH)2 to form hydrated calcium aluminate (such as C3AH6), further promoting strength development. In addition, the sugar residue is treated with white mud alkali during the preparation process, which gives it better toughness and a rougher surface, and can further enhance the overall strength as a fiber material.

[0022] 3. The anti-corrosion concrete prepared by this method has extremely high density. The introduction of fibers and the effective control of hydration heat and hydration shrinkage give it excellent crack resistance and can effectively block the intrusion of external corrosive gases. When microcracks appear in the concrete, the coarse-particle aluminoferrite cement clinker, together with the water-retaining components in the white clay and the moisture retained by the microplastics, can hydrate and repair and compensate for the cracks. At the same time, the calcium sulfosilicate contained in the new low-calcium clinker generates a gel-like product after hydration, which easily reacts with carbon dioxide to form calcium carbonate crystals. This process continuously consumes carbon dioxide, and the generated crystals further fill the micropores, thereby increasing the density of the system. In addition, the large amount of slag, calcium sulfoaluminate, dicalcium silicate, and other carbonaceous active minerals contained in the system, whose corresponding hydration products also have the ability to react with carbon dioxide, can further consume the intruding carbon dioxide, forming a multi-layered three-dimensional protection, effectively preventing carbon dioxide from eroding the deep interior of the concrete. The styrene-butadiene emulsion and microplastics contained in the white mud can coat the surface of steel fibers, enhance chemical adsorption, fill microcracks, and improve the toughness and crack resistance of the interface transition zone, thereby improving the overall flexibility and resistance to gas erosion of concrete. The water-retaining components in the white mud, together with the water retention of microplastics, can also achieve self-curing of concrete. The products of calcium aluminoferrite hydration have good toughness and abrasion resistance, and can also significantly increase the corrosion resistance of concrete.

[0023] 4. Tailings, slag, titanium gypsum, aluminoferrite cement clinker, and graphite in tailings all possess excellent electrical conductivity. Introducing them into concrete creates a conductive network, allowing electrons to migrate freely and effectively inhibiting the migration of corrosive ions, thus preventing damage to the concrete and anti-corrosion layer structure due to ion erosion. Simultaneously, the lead and zinc components in slag act as oxidizing agents, forming a dual protection mechanism on top of conductive protection, further enhancing the system's resistance to ion erosion. Furthermore, the water-retaining components in white clay absorb and retain moisture, reducing ion migration channels in the internal porous aqueous solution, further mitigating the risk of ion erosion.

[0024] 5. Concrete, with its highly dense structure, effectively prevents microorganisms and their metabolic products from penetrating into the interior. Simultaneously, the residues of mineral processing agents (such as kerosene) in tailings and the heavy metals abundant in slag have significant bactericidal effects, inhibiting bacterial growth on the anti-corrosion layer and concrete surface, thus preventing their erosion of the internal structure. Furthermore, the overall highly alkaline environment of the system further reduces the possibility of microbial growth and survival, forming a multi-layered protective mechanism from physical barriers to chemical inhibition.

[0025] 6. This concrete system exhibits excellent overall durability due to its highly dense matrix structure and good long-term strength development. On the one hand, dicalcium silicate continues to hydrate in the later stages and works synergistically with the water-retaining components in the white clay to continuously replenish and strengthen the microstructure, resulting in steady strength growth. Simultaneously, the system maintains a high alkalinity, effectively protecting the internal reinforcing steel from corrosion. Furthermore, the styrene-butadiene emulsion in the white clay forms a protective film on the steel surface, increasing the concrete's corrosion resistance. On the other hand, the synergistic effect of microplastics and the water-retaining components in the white clay forms uniformly distributed micro-buffered air bubbles within the concrete, significantly enhancing its resistance to freeze-thaw cycles. These combined characteristics systematically enhance the long-term service performance of the concrete from multiple dimensions, including structural stability, steel reinforcement protection, and environmental adaptability.

[0026] 7. This invention demonstrates significant environmental friendliness by extensively utilizing solid waste as raw materials. Compared to traditional anti-corrosion coatings—whose anti-corrosion performance is easily compromised by localized damage or, like organic coatings, have poor oxidation resistance—this concrete maintains its long-lasting corrosion resistance even in harsh environments, whether exposed or isolated. Furthermore, this technology does not significantly increase production costs and requires no additional maintenance or upkeep during later use, exhibiting excellent economic efficiency and applicability. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the microplastics used in the anti-corrosion concrete cementitious material of the present invention; Figure 2This is a schematic diagram of the sugar residue used in the anti-corrosion concrete special cementitious material of the present invention; Figure 3 This is a schematic diagram comparing the preparation of concrete using ordinary concrete and the special cementitious material for anti-corrosion concrete of this 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] All raw materials used in this invention (except for the novel low-calcium clinker) are conventional commercially available products or recycled industrial solid waste 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 remaining raw materials all meet the corresponding preferred parameter standards, as shown in the appendix. Figure 2 As shown, sugar residue is the fibrous residue remaining after sugarcane (or sugar beet) is pressed to extract sugar juice. It has a moisture content of 8%, a length of 10mm, an aspect ratio of 150, and a cellulose content of 55%. The tailings are cryptocrystalline graphite flotation tailings with a moisture content of 4%. The water-reducing agent is a high-performance polycarboxylate water-reducing agent with a water reduction rate of 28%. The slag is selected from zinc smelting slag (aluminum smelting slag or magnesium smelting slag can also be used). The white mud has a calcium carbonate content of 92% and a sodium hydroxide content of 0.5%. (See attached...) Figure 1 As shown, microplastics are plastic waste that has been crushed into fine particles with a particle size controlled between 0.5-5 mm; titanium gypsum is a solid waste byproduct of the titanium dioxide industry, with a calcium sulfate dihydrate content of 93%; and aluminoferrite cement clinker conforms to the GB / T45920-2025 standard (iron oxide content 8%, alumina content 27%).

[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 material proportions for anti-corrosion concrete cementitious materials (by mass parts, 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 low-calcium clinker in each embodiment balances early strength and carbonation resistance by adjusting the ratio of dicalcium silicate to calcium sulfoaluminate. Combined with the synergistic effect of calcium sulfoaluminate and calcium sulfate, it further enhances the compatibility with components such as ferroaluminate cement clinker and white mud, ensuring the effective functioning of multiple anti-corrosion mechanisms.

[0033] The raw materials from Examples 1 to 5 above were used to prepare a gelling material according to the following method, the specific steps of which are as follows: S1. Weigh out sugar residue and white mud according to the mass fractions, mix them thoroughly, and dry them at low temperature after full reaction to obtain material A; S2. Weigh out titanium gypsum, slag, and new low-calcium clinker according to the specified mass fractions, and grind them together with material A obtained in step S1, controlling the specific surface area to be 380-420 m². 2 / kg, yielding material B; S3. Weigh the tailings and water-reducing agent according to the mass fractions, grind them, and control the specific surface area to be 550-620m². 2 / kg; Material C is obtained; S4. Weigh out the microplastic and aluminoferrite cement clinker according to the specified mass fractions, grind it, and control the specific surface area to be 230-280 m². 2 / kg, yielding material D; S5. After mixing materials B, C and D evenly, the special cementitious material for anti-corrosion concrete is obtained.

[0034] In the above preparation process, only the specific surface area parameters of each grinding stage were adjusted. The specific process parameters are shown in Table 2 below. The low-temperature drying temperature is controlled at 60℃-80℃ and the drying time is 2 hours to ensure that the moisture content of material A is <5%. Planetary ball mills are used for each grinding stage, and the mixing uniformity error is ≤2%.

[0035] Table 2 shows the process parameters for preparing the cementitious materials in each embodiment.

[0036] To verify the comprehensive performance of the cementitious material of the present invention, concrete specimens were formed from the cementitious materials prepared in the above five examples, and ordinary Portland cement concrete of the same grade was used as a control sample. Performance tests were carried out according to the following standards: (1) Test block molding: Refer to Table 3 below for concrete mix proportions (unit: kg / m³) 3 Prepare standard test blocks of 150mm*150mm*150mm, with 3 parallel test blocks in each group, and cure under standard conditions for 28 days; Table 3 shows the concrete mix proportions (kg / m³). 3 )

[0037] (2) Strength test: According to GB / T50081-2019 "Standard for Test Methods of Physical and Mechanical Properties of Concrete", the compressive strength of the test blocks at 3d and 28d was tested; (3) Carbonation resistance test: The cured test block is placed in the carbonation box, and the carbon dioxide concentration is controlled at 20%, the humidity at 70%, and the temperature at 20℃. After carbonation for 48 hours, the carbonation depth is determined in accordance with GB / T50082-2009 "Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete".

[0038] (4) Resistance to ion erosion test: The test block was immersed in standard seawater (salinity 35‰) for 200 days, and the chloride and sulfate ion content inside the test block was tested; (5) Antimicrobial corrosion performance test: The test block was placed in artificially prepared enhanced sewage (SCOD=3000±200mg / L, which is 10 times the concentration of actual sewage) for accelerated corrosion test. After soaking for 30 days, the mass loss rate of the test block was measured.

[0039] The performance test results of each embodiment and the comparative sample are shown in Table 4 below: Table 4 shows the corrosion resistance test results for each embodiment and comparative sample block.

[0040] The following conclusions can be drawn from the test data: (1) Strength performance: The 3-day and 28-day compressive strength of each example was significantly better than that of the control sample, and the 28-day compressive strength increased by 38%-52%, with Example 3 showing the best strength (92.0 MPa). This indicates that the present invention effectively improves the early and late strength of concrete through the synergistic effect of novel low-calcium clinker and aluminoferrite cement clinker, combined with the optimized control of the fineness of each component, thus meeting the requirements of high-performance concrete; (2) Carbonation resistance: The carbonation depth of the example is only 2.7-4.1 mm, which is more than 50% lower than that of the control sample (8.1 mm). This reflects the synergistic anti-carbonation effect of calcium sulfosilicate and white mud in the new low-calcium clinker, which can effectively prevent carbon dioxide from invading and protect the internal structure of concrete. (3) Resistance to ion erosion: The chloride and sulfate ion contents in the examples were reduced by 46%-66% compared with the control sample, indicating that the dense packing and conductivity hysteresis mechanism played a significant role, which can effectively block the migration of corrosive ions and is suitable for corrosive environments such as marine and saline soil. (4) Antimicrobial corrosion performance: The mass loss rate of the example was only 4.39%-6.53%, which was much lower than that of the control sample (12.81%). This is attributed to the high alkalinity of the system, the bactericidal components of tailings and slag, and the physical barrier effect of the dense structure, resulting in excellent antimicrobial corrosion performance.

[0041] In summary, the anti-corrosion concrete-specific cementitious material prepared by this invention utilizes a multi-component synergistic effect and multiple protective mechanisms, as described in the appendix to the specification. Figure 3 As shown, attached Figure 3The top image shows ordinary concrete, and the bottom image shows the anti-corrosion concrete prepared using the cementitious material of this invention. Figure 3 Both concrete structures shown are located in Hainan, 5km from the sea. Figure 3 The comparison shows that the concrete prepared by the cementitious material of the present invention has significantly better comprehensive performance than ordinary concrete. It also makes extensive use of industrial solid waste, has controllable cost and is environmentally friendly. It can be widely used in infrastructure construction in harsh and corrosive environments such as marine engineering, industrial buildings and acidic soils.

Claims

1. A special cementitious material for anti-corrosion concrete, characterized in that: The cementitious material comprises the following components by weight: 1-4 portions of sugar residue; 15-25 portions of tailings; 0.5-1.5 parts water-reducing agent; 8-18 parts slag; 25-35 parts of the new low-calcium clinker; 3-9 parts white clay; 2-6 parts microplastics; 3-8 parts titanium plaster; 15-25 parts of aluminoferrite cement clinker; The mineral composition of the novel low-calcium clinker, by mass percentage, has a total mass percentage of 100%, including: 40%-50% dicalcium silicate; 25%-30% calcium sulfoaluminate; 3%-8% calcium sulfosilicate; 3%-8% Tetracalcium aluminoferrite; 8%-15% calcium sulfate; 1%-5% free calcium oxide.

2. The anti-corrosion concrete special cementitious material as described in claim 1, characterized in that: The sugar residue is the fibrous residue remaining after sugarcane or sugar beet is pressed to extract sugar juice. It has a moisture content of <10%, a length of 10-30mm, an aspect ratio of 50-150, and a cellulose content of >50%.

3. The anti-corrosion concrete special cementitious material as described in claim 1, characterized in that: The tailings are cryptocrystalline graphite flotation tailings with a moisture content of <5%.

4. The anti-corrosion concrete special cementitious material as described in claim 1, characterized in that: The water-reducing agent is a polycarboxylate high-performance water-reducing agent with a water reduction rate of >25%.

5. A special cementitious material for anti-corrosion concrete as described in any one of claims 1-4, characterized in that: The slag is slag from the smelting of zinc, aluminum, or magnesium.

6. The anti-corrosion concrete special cementitious material as described in claim 5, characterized in that: The slag is the slag from zinc smelting.

7. The anti-corrosion concrete-specific cementitious material as described in claim 1, characterized in that: The white mud is a solid waste generated by the papermaking industry, with a calcium carbonate content >90% and a sodium hydroxide content >0.3%.

8. The anti-corrosion concrete special cementitious material as described in claim 1, characterized in that: The microplastics are made by crushing the processed plastic waste into fine particles with a particle size of 0.5-5mm.

9. The anti-corrosion concrete special cementitious material as described in claim 1, characterized in that: The titanium gypsum is a solid waste generated by the titanium dioxide industry, and its calcium sulfate dihydrate content is >90%.

10. The anti-corrosion concrete special cementitious material as described in claim 1, characterized in that: The ferroaluminate cement clinker is a ferroaluminate cement clinker conforming to the GB / T45920-2025 standard "Ferroaluminate Cement", with an iron oxide content >7% and an alumina content >25%.

11. A method for preparing a special cementitious material for anti-corrosion concrete as described in any one of claims 1-10, characterized in that: Includes the following steps, S1. Weigh out sugar residue and white mud according to the mass fractions, mix them thoroughly, and dry them at low temperature after full reaction to obtain material A; S2. Weigh out titanium gypsum, slag, and new low-calcium clinker according to the specified mass fractions, and grind them together with material A obtained in step S1, controlling the specific surface area to be 380-420 m². 2 / kg, yielding material B; S3. Weigh the tailings and water-reducing agent according to the mass fractions, grind them, and control the specific surface area to be 550-620m². 2 / kg; Material C is obtained; S4. Weigh out the microplastic and aluminoferrite cement clinker according to the specified mass fractions, grind it, and control the specific surface area to be 230-280 m². 2 / kg, yielding material D; S5. After mixing materials B, C and D evenly, the special cementitious material for anti-corrosion concrete is obtained.

Images