Sulphoaluminate cement-based double-component mortar capable of resisting corrosion of high-concentration chlorine salt, sulfate and magnesium salt and preparation method of sulphoaluminate cement-based double-component mortar

Abstract

The invention discloses a sulphoaluminate cement-based double-component mortar capable of resisting corrosion of high-concentration chlorine salt, sulfate and magnesium salt and a preparation method of the sulphoaluminate cement-based double-component mortar. The sulphoaluminate cement-based double-component mortar comprises a mineral component and a chemical additive component, wherein the mineral component comprises the following raw materials in parts by mass: 100 parts of sulphoaluminate cement, 1-5 parts of silica fume, 4-6 parts of metakaolin, 6-10 parts of granulated blast furnace slag, 5-10 parts of Portland cement clinker and 100-300 parts of clean dry sand; and the chemical admixture comprises the following components in parts by mass: 0.2 to 1.2 parts of a retarder, 0.2 to 0.5 part of a corrosion inhibitor and 0.3 to 1.5 parts of a water reducing agent. The double-component mortar can ensure that the performance of the chemical admixture is not reduced due to dampness during the storage period, so that the performance stability of the mortar is ensured.

Description

Technical Field

[0001] This invention relates to the field of cement-based materials technology, and in particular to a two-component mortar based on sulfoaluminate cement that is resistant to corrosion by high concentrations of chloride, sulfate and magnesium salts, and its preparation method. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Mortar is a building material made by mixing cementitious materials (such as cement and lime), fine aggregates (such as sand), water, and admixtures and additives as needed, in a certain proportion. Cement mortar uses cement as the cementing material, mixed with sand and water in a specific ratio. Cement mortar has high strength and durability, and is suitable for masonry, plastering, flooring, and other projects. It is one of the most widely used types of mortar in construction engineering. Mortar with moderate consistency has good fluidity and workability, making it easy to apply. If the consistency is too low, the mortar is too thin and prone to bleeding and segregation; if the consistency is too high, the mortar is too dry and hard, making it difficult to apply. Good water retention prevents the mortar from evaporating too quickly during construction, which would affect its strength and bonding properties. Mortar with poor water retention is prone to bleeding and segregation, leading to a decline in mortar performance. The strength of mortar refers to its ability to resist failure under stress, usually expressed as compressive strength and flexural strength. Compressive strength refers to the ability of mortar to resist failure under pressure, and is the main strength indicator of mortar. Flexural strength refers to the ability of mortar to resist failure under bending force, and is mainly used to measure the crack resistance of mortar. Mortar strength grades are classified according to compressive strength, and common strength grades include M2.5, M5, M7.5, M10, M15, and M20.

[0004] Bond strength refers to the ability of mortar to bond with the substrate material (such as brick, stone, concrete, etc.). Good bond strength ensures a tight bond between the mortar and the substrate, improving the overall integrity and stability of the structure. Bond strength is affected by factors such as mortar composition, substrate surface treatment, and construction techniques.

[0005] In certain special environments, such as saline-alkali land and industrial wastewater, there are high concentrations of chloride ions, sulfate ions, and magnesium ions. These high concentrations of ions are highly corrosive to reinforced concrete structures. For example, chloride ions accelerate the corrosion of steel bars, while magnesium and sulfate ions can cause corrosion damage to concrete. Therefore, concrete structures in these environments should have excellent resistance to chloride ion penetration and corrosion by sulfates and magnesium salts. Currently, the mortar used in concrete structures in these environments mainly uses silicate cement with appropriate admixtures and additives to improve the corrosion resistance of the concrete structure, while anti-corrosion coatings are applied to the surface of the concrete structure. However, after silicate cement hydrates, it produces a large amount of calcium hydroxide (Ca(OH)2) and hydrated calcium aluminate (such as 3CaO·Al2O3·6H2O). These hydration products are prone to corrosion reactions in environments with high concentrations of chloride, sulfate, and magnesium ions. Chloride ions can penetrate the pores of concrete and react with the passivation film on the surface of the steel bars, destroying the passivation film and leading to steel bar corrosion. Some chloride ions can react with calcium hydroxide to form soluble calcium chloride, further damaging the internal structure of concrete. Sulfate ions react with hydration products in cement to form expansive corrosion products, such as ettringite (3CaO·Al₂O₃·3CaSO₄·32H₂O). The expansion of these products leads to internal stress in the concrete, causing cracking and spalling. When magnesium ions and sulfate ions act together, they exacerbate concrete corrosion. Magnesium ions can react with calcium hydroxide to form magnesium hydroxide. This reaction consumes calcium hydroxide, reducing the alkalinity of the concrete and accelerating other corrosion reactions. Furthermore, the resulting magnesium hydroxide is soft and lacks binding properties, reducing the strength of the concrete. Applying anti-corrosion coatings to the surface of concrete structures can protect them from corrosion in the short term, but these coatings are generally polymeric materials and are subject to aging, especially in environments with high concentrations of chloride, sulfate, and magnesium salts. The coatings will age faster, losing their protective function within a few years, a decade, or at most 20-30 years. Therefore, coatings cannot effectively protect concrete structures for extended periods. Therefore, concrete structures in these environments are prone to corrosion and damage, requiring repeated repairs during use, and their service life often falls short of design requirements. Summary of the Invention

[0006] The purpose of this invention is to overcome the deficiencies of existing technologies and provide a two-component mortar based on sulfoaluminate cement that resists corrosion by high concentrations of chloride, sulfate, and magnesium salts, and its preparation method. The mortar includes repair mortar for existing engineering structures, mortar for new engineering projects, and concrete mortar prepared using this mortar that resists corrosion by high concentrations of chloride, sulfate, and magnesium salts. This mortar exhibits excellent resistance to corrosion by high concentrations of chloride ions, sulfates, and magnesium salts. It remains intact and undamaged even after prolonged immersion in solutions containing high concentrations of chloride, sulfate, and magnesium ions (testing time has exceeded 4 years), without any reduction in flexural or compressive strength. Chloride ions can hardly penetrate it (the penetration depth measured by the colorimetric method with 0.1 mol / L silver nitrate solution is less than 5 mm). Furthermore, the setting and hardening speed is adjustable, making it suitable for both repairing concrete structures and constructing new mortar and concrete projects.

[0007] This invention is achieved through the following technical solution:

[0008] A two-component mortar based on sulfoaluminate cement, resistant to high-concentration chloride, sulfate, and magnesium salt corrosion, comprises a mineral component and a chemical admixture component. The mineral component includes the following raw materials: 100 parts by weight of sulfoaluminate cement, 1-5 parts by weight of silica fume, 4-6 parts by weight of metakaolin, 6-10 parts by weight of granulated blast furnace slag, 5-10 parts by weight of silicate cement clinker, and 100-300 parts by weight of clean dry sand. The chemical admixture component includes: 0.2-1.2 parts by weight of retarder, 0.2-0.5 parts by weight of corrosion inhibitor, and 0.3-1.5 parts by weight of water-reducing agent. The two-component mortar ensures that the chemical admixtures will not be affected by moisture during storage, thus maintaining the stability of the mortar's performance.

[0009] The sulfoaluminate cement is a special type of cement, composed of sulfoaluminate cement clinker and dihydrate gypsum. The mineral composition of the sulfoaluminate cement clinker is as follows: C4AF, C2S, among which The content is 40-50%, C4AF content is 15-25%, C2S content is 20-30%, and the dihydrate gypsum content is 12-18% of the amount of sulfoaluminate cement clinker.

[0010] The retarder is either borax or boric acid.

[0011] The clean dry sand is river sand or lake sand that has been washed three times and then dried or air-dried, and can be fine sand, medium sand, coarse sand, or Chinese ISO standard sand.

[0012] The water-reducing agent is a polycarboxylate water-reducing agent.

[0013] The silicate cement clinker is the clinker used in the production of silicate cement.

[0014] The corrosion resist is composed of sodium tripolyphosphate and sodium potassium tartrate in a mass ratio of 1:2, 1:1, or 2:1.

[0015] A method for preparing a two-component mortar resistant to high concentrations of chloride, sulfate, and magnesium salt corrosion based on sulfoaluminate cement, specifically including the following steps:

[0016] (1) Grind silicate cement clinker in a ball mill until the residue on an 80-micron sieve is less than 10%;

[0017] (2) Dry mix sulfoaluminate cement, silica fume, slag, meta-high terephthalic acid, silicate cement clinker and clean dry sand in a mixer for 3-4 minutes to make them evenly mixed and obtain mineral components. Store in a waterproof and moisture-proof environment.

[0018] (3) Mix the retarder, corrosion inhibitor and water-reducing agent (all of which are powders) evenly to obtain the chemical additive components, and then store them in a sealed container to prevent moisture absorption;

[0019] (4) At the construction site, dry mix the mineral components obtained in step (2) and the chemical additive components obtained in step (3) in a mixer for 3-4 minutes. Then add water according to the ratio and continue mixing in the mixer for 3-4 minutes before mortar application. The water is drinking water, including tap water, clean river water, lake water, etc.

[0020] The ratio described in step (4) is a water-to-glue ratio of no more than 0.4.

[0021] The silica fume is commercially available silica fume of various grades.

[0022] The term "elevated land" refers to all types of commercially available elevated land.

[0023] The advantages of the present invention are: (1) The two-component mortar of the present invention can ensure that the chemical admixture will not be affected by moisture and its performance will decline during storage, thus ensuring the stability of the mortar performance.

[0024] (2) The corrosion inhibitor of the present invention is composed of sodium tripolyphosphate and sodium potassium tartrate. They are chelating agents that can combine with calcium ions, aluminum ions and other substances in cement paste to form complexes, which are coated on the surface of cement particles. This isolates corrosive ions such as chloride ions, magnesium ions and sulfate ions from contact with cement particles, effectively protecting cement particles from corrosion. This effectively improves the corrosion resistance of mortar, allowing the mortar to remain intact for a long time without damage in a high-concentration corrosive environment.

[0025] (3) This invention utilizes the chemical reaction between sulfoaluminate cement and high concentrations of chloride ions, magnesium ions and sulfate ions to generate some new substances (such as F salt, K salt and some new minerals). These newly generated substances fill the surface of the hardened mortar, making the surface dense, thereby effectively preventing the penetration of corrosive ions and significantly improving the corrosion resistance of the mortar. Moreover, the more the soaking time increases, the more new substances are generated, the denser the mortar surface becomes, and the better the corrosion resistance of the mortar.

[0026] (4) This invention exhibits excellent resistance to chloride ion penetration in environments with high concentrations of chloride, magnesium, and sulfate salts. After soaking in a 10% NaCl + 10% MgCl2 + 10% Na2SO4 solution for 4 years, the chloride ion penetration depth of the mortar specimens of this invention was less than 5 mm (measured by colorimetric method), demonstrating excellent resistance to high concentration chloride ion penetration. The mortar of this invention exhibits excellent resistance to high concentration chloride ion penetration for three main reasons: First, the addition of silica fume can fill the pores of the mortar, making the mortar denser; second, the hydration products of sulfoaluminate cement can react with high concentrations of chloride, sulfate, and magnesium ions in the environmental water to form water-insoluble substances such as F salts, K salts, and some minerals, which fill the pores on the surface of the mortar, making the mortar surface denser and effectively preventing chloride ion penetration; third, the hydration products of sulfoaluminate cement in the mortar have a large physical and chemical adsorption capacity for chloride ions, greatly reducing the concentration of free chloride ions in the mortar pore solution.

[0027] (5) This invention exhibits excellent resistance to sulfate corrosion. The main reason why silicate cement is not resistant to sulfate corrosion is that a large amount of calcium hydroxide and hydrated calcium aluminate are generated after cement hydration. These can react with sulfate ions to form ettringite, which expands in volume and causes the cement stone to crack. In the mortar of this invention, the amount of calcium hydroxide generated after the hydration of sulfoaluminate cement is small, thus exhibiting excellent resistance to sulfate corrosion. Furthermore, the silica fume added to this mortar makes it denser, which also helps to improve the mortar's resistance to sulfate corrosion. Finally, the addition of metakaolin and slag also helps to improve the mortar's resistance to sulfate corrosion, because metakaolin and slag have high pozzolanic activity, which can improve the density of the mortar and also enhance its resistance to sulfate attack.

[0028] (6) This invention exhibits excellent resistance to magnesium ion corrosion. Magnesium ions corrode silicate cement because they can replace calcium ions in the hydration product CSH (calcium silicate hydrate) to form MSH (magnesium silicate hydrate). MSH has very low binding properties, leading to a decrease in cement stone strength. Furthermore, magnesium ions can react with the hydration product calcium hydroxide to form magnesium hydroxide, which has low strength, further reducing the strength of the cement stone. In this invention, the amount of calcium hydroxide generated after the hydration of sulfoaluminate cement in the mortar is small, and the amount of CSH generated is also very small. Therefore, this mortar has excellent resistance to magnesium ion corrosion. In addition, the silica fume incorporated into the mortar of this invention makes the mortar denser, preventing the penetration of magnesium ions. Finally, in a solution with high concentrations of chloride, sulfate, and magnesium ions, sulfoaluminate cement can react with these ions to form new substances on the mortar surface, making the mortar surface denser and preventing the penetration of magnesium, sulfate, and chloride ions. Research indicates that the sulfoaluminate cement mortar of this invention exhibits resistance to high concentrations of sulfate ion attack. After immersion in sodium sulfate solutions of 20.25 g / L and 30 g / L for 12 months, its corrosion resistance coefficient remains greater than 1.0, exceeding the standard requirement of 0.8. Furthermore, the sulfoaluminate cement mortar of this invention can resist the combined attack of high concentrations of sulfate and magnesium ions, such as resistance to Mg... 2+ The concentration was 15.2 g / L, SO4 2- It exhibits dual corrosive effects from etching solutions with a concentration ≤20.25 g / L, but is not resistant to high concentrations of Mg. 2+ SO4 2- Co-erosion meant that even sulfoaluminate cement mortar specimens with a water-cement ratio reduced to 0.3 could not resist Mg. 2 + The concentration was 15.2 g / L, SO4 2- Concentration greater than 60.0 g / L and Mg 2+ The concentration was 15.2 g / L, SO4 2- The mortar, based on sulfoaluminate cement, exhibits excellent corrosion resistance even after being immersed in a composite solution of 10% (or 15%, 20%) magnesium chloride + 10% (or 15%, 20%) sodium sulfate for 4 years. Therefore, the mortar of this invention possesses excellent resistance to high-concentration sulfate and magnesium salt corrosion.

[0029] (7) This invention has good environmental performance. For example, the mortar of this invention is an inorganic material and does not contain polymer materials (except for a very small amount of admixtures). It does not release toxic substances in water and does not have aging problems. In addition, compared with silicate cement, sulfoaluminate cement has the characteristics of low energy consumption and low carbon emissions. Attached Figure Description

[0030] Figure 1 This is a diagram of the mortar prepared according to Embodiment 1 of the present invention;

[0031] Figure 2 This is a diagram of the mortar prepared according to Example 2 of the present invention;

[0032] Figure 3 This is a diagram of the mortar prepared in Example 3 of the present invention. Detailed Implementation

[0033] A two-component mortar based on sulfoaluminate cement, resistant to high-concentration chloride, sulfate, and magnesium salt corrosion, comprises a mineral component and a chemical admixture component. The mineral component includes the following raw materials: 100 parts by weight of sulfoaluminate cement, 1-5 parts by weight of silica fume, 4-6 parts by weight of metakaolin, 6-10 parts by weight of granulated blast furnace slag, 5-10 parts by weight of silicate cement clinker, and 100-300 parts by weight of clean dry sand. The chemical admixture component includes: 0.2-1.2 parts by weight of retarder, 0.2-0.5 parts by weight of corrosion inhibitor, and 0.3-1.5 parts by weight of water-reducing agent. The two-component mortar ensures that the chemical admixtures will not be affected by moisture during storage, thus maintaining the stability of the mortar's performance.

[0034] The sulfoaluminate cement is a special type of cement, composed of sulfoaluminate cement clinker and dihydrate gypsum. The mineral composition of the sulfoaluminate cement clinker is as follows: C4AF, C2S, among which The content is 40-50%, C4AF content is 15-25%, C2S content is 20-30%, and the dihydrate gypsum content is 12-18% of the amount of sulfoaluminate cement clinker.

[0035] The retarder is either borax or boric acid.

[0036] The clean dry sand is river sand or lake sand that has been washed three times and then dried or air-dried, and can be fine sand, medium sand, coarse sand, or Chinese ISO standard sand.

[0037] The water-reducing agent is a polycarboxylate water-reducing agent.

[0038] The silicate cement clinker is the clinker used in the production of silicate cement.

[0039] The corrosion resist is composed of sodium tripolyphosphate and sodium potassium tartrate in a mass ratio of 1:2, 1:1, or 2:1.

[0040] A method for preparing a two-component mortar resistant to high concentrations of chloride, sulfate, and magnesium salt corrosion based on sulfoaluminate cement, specifically including the following steps:

[0041] (1) Grind silicate cement clinker in a ball mill until the residue on an 80-micron sieve is less than 10%;

[0042] (2) Dry mix sulfoaluminate cement, silica fume, slag, meta-high terephthalic acid, silicate cement clinker and clean dry sand in a mixer for 3-4 minutes to make them evenly mixed and obtain mineral components. Store in a waterproof and moisture-proof environment.

[0043] (3) Mix the retarder, corrosion inhibitor and water-reducing agent (all of which are powders) evenly to obtain the chemical additive components, and then store them in a sealed container to prevent moisture absorption;

[0044] (4) At the construction site, dry mix the mineral components obtained in step (2) and the chemical additive components obtained in step (3) in a mixer for 3-4 minutes. Then add water according to the ratio and continue mixing in the mixer for 3-4 minutes before mortar application. The water is drinking water, including tap water, clean river water, lake water, etc.

[0045] The ratio described in step (4) is a water-to-glue ratio of no more than 0.4.

[0046] In the water-cement ratio, "cement" refers to the sum of all mineral components with gelling activity, specifically including:

[0047] Sulfoaluminate cement (100 parts by weight, main cementitious material)

[0048] Silica fume (1-5 parts by weight, active microfiller)

[0049] Metakaolin (4-6 parts by weight, volcanic ash active material)

[0050] Granulated blast furnace slag (6-10 parts by weight, auxiliary cementitious material)

[0051] Silicate cement clinker (5-10 parts by weight, supplementing the cementitious components)

[0052] Excludes clean dry sand (inert aggregate) and chemical admixtures (retarders, corrosion inhibitors, water-reducing agents).

[0053] Therefore, the total amount of cementitious materials is the sum of the masses of the above 5 components, and a water-cement ratio of ≤0.4 means the ratio of water to the total mass of these cementitious materials.

[0054] The silica fume is commercially available silica fume of various grades.

[0055] The term "elevated land" refers to all types of commercially available elevated land.

[0056] This invention features a multi-mechanism synergistic corrosion resistance mechanism:

[0057] (1) Optimization of gelation system

[0058] Sulfoaluminate cement ( It is the dominant process that rapidly forms ettringite (AFt) and hydrated calcium aluminate, resulting in high early strength. Furthermore, AFt crystals can fill pores and reduce permeability.

[0059] Composite admixture of silica fume, metakaolin, and slag:

[0060] Silica fume fills cement pores, reducing porosity;

[0061] Metakaolin reacts with CH (calcium hydroxide) to form CSH gel, which increases density;

[0062] Slag consumes CH and generates CSH gel, which enhances its resistance to sulfate attack.

[0063] (2) Corrosion resistance mechanism:

[0064] Chloride salts: Sulfoaluminate cement can react with chloride ions to generate F salts and K salts, thereby solidifying chloride ions; silicate cement clinker can continuously hydrate to generate hydration products, preventing the later strength reduction of sulfoaluminate cement.

[0065] Sulfate: Low calcium hydroxide content (sulfoaluminate cement) reduces the risk of ettringite expansion; slag and metakaolin inhibit sulfate attack.

[0066] Magnesium salts: High-aluminum phase With Mg 2+ It forms stable magnesium-aluminum hydrates (such as Mg-Al LDH), reducing the destruction of magnesium ions.

[0067] (3) Synergistic effect of admixtures:

[0068] Borax / boric acid retarder: Delays the rapid setting of sulfoaluminate cement, ensuring construction time.

[0069] Polycarboxylate superplasticizer: Reduces the water-cement ratio (≤0.4), increases density, and reduces the penetration of corrosive media.

[0070] Corrosion inhibitor: It can complex cations in the environment, and the resulting complexes coat the surface of cement particles, protecting them from corrosion.

[0071] Example 1

[0072] The mortar prepared with 100 parts by weight of sulfoaluminate cement, 40 parts by weight of water, 0.3 parts by weight of borax, 0.5 parts by weight of water-reducing agent, 0.2 parts by weight of corrosion inhibitor, 5 parts by weight of nano-silica fume, 10 parts by weight of S95 grade slag powder, 6 parts by weight of metasaturated soil powder, and 300 parts by weight of sand exhibits low bleeding, high early strength, and further increase in later strength without shrinkage. After immersion in a 10% MgCl2 solution + 10% Na2SO4 solution for 4 years, the specimen surface showed no obvious damage, the edges and corners remained intact, and the mortar was extremely hard. Figure 1The chloride ion penetration depth was only 5 mm, and the free sulfate ion content within 5 mm of the exposed surface was only 0.15%, and the free magnesium ion content was only 0.027%. The compressive and flexural strengths increased continuously with increasing immersion time (see Table 1). The mortar exhibited excellent resistance to corrosion from high concentrations of chloride ions, sulfates, and magnesium salts.

[0073] Example 2

[0074] The mortar was prepared using a mixture of 100 parts by weight of sulfoaluminate cement, 35 parts by weight of water, 0.4 parts by weight of borax, 0.8 parts by weight of water-reducing agent, 0.3 parts by weight of corrosion inhibitor, 4 parts by weight of nano-silica fume, 8 parts by weight of S95 grade slag powder, 5 parts by weight of metasaturated clay powder, and 240 parts by weight of sand. The prepared mortar exhibited low bleeding, high early strength, and continued to increase in later strength without shrinkage. After immersion in a 15% MgCl2 solution + 15% Na2SO4 solution for 4 years, the specimens showed no obvious surface damage, intact edges, and were extremely hard. Figure 2 The chloride ion penetration depth was only 4 mm, and the free sulfate ion content within 5 mm of the exposed surface was only 0.12%, and the free magnesium ion content was only 0.023%. The compressive and flexural strengths continuously increased with immersion time, as shown in Table 2. The mortar exhibited excellent resistance to corrosion from high concentrations of chloride, sulfate, and magnesium salts.

[0075] Example 3

[0076] The mortar was prepared using a mixture of 100 parts by weight of sulfoaluminate cement, 30 parts by weight of water, 0.6 parts by weight of borax, 1.0 part by weight of water-reducing agent, 0.4 parts by weight of corrosion inhibitor, 3 parts by weight of nano-silica fume, 6 parts by weight of S95 grade slag powder, 4 parts by weight of metasaturated soil powder, and 200 parts by weight of sand. The mortar exhibited low bleeding, high early strength, and continued to increase in later strength without shrinkage (see Table 3). After immersion in a 20% MgCl2 solution + 20% Na2SO4 solution for 4 years, the specimen surface remained undamaged, with intact edges and corners, and was extremely hard. Figure 3 The chloride ion penetration depth is only 2 mm, and the free sulfate ion content within 5 mm of the exposed surface is only 0.10%, and the free magnesium ion content is only 0.021%. The mortar exhibits excellent resistance to corrosion from high concentrations of chloride, sulfate, and magnesium salts.

[0077] Table 1. Strength development of two-component mortar with a water-cement ratio of 0.40 in 10% MgCl2 solution + 10% Na2SO4 solution.

[0078]

[0079] Table 2. Strength development of two-component mortar with a water-cement ratio of 0.35 in 15% MgCl2 solution + 15% Na2SO4 solution.

[0080]

[0081] Table 3. Strength development of two-component mortar with a water-cement ratio of 0.3 in 20% MgCl2 solution + 20% Na2SO4 solution.

[0082]

Claims

1. A two-component mortar based on sulfoaluminate cement that resists corrosion by high concentrations of chloride, sulfate, and magnesium salts, characterized in that: It includes mineral components and chemical admixture components. The mineral components include the following raw materials: 100 parts by weight of sulfoaluminate cement, 1-5 parts by weight of silica fume, 4-6 parts by weight of metakaolin, 6-10 parts by weight of granulated blast furnace slag, 5-10 parts by weight of silicate cement clinker, and 100-300 parts by weight of clean dry sand. The chemical admixture components include: 0.2-1.2 parts by weight of retarder, 0.2-0.5 parts by weight of corrosion inhibitor, and 0.3-1.5 parts by weight of water-reducing agent.

2. The two-component mortar based on sulfoaluminate cement for resisting corrosion by high concentrations of chloride, sulfate, and magnesium salts according to claim 1, characterized in that: The sulfoaluminate cement is a special type of cement, composed of sulfoaluminate cement clinker and dihydrate gypsum. The mineral composition of the sulfoaluminate cement clinker is as follows: C4AF, C2S, among which The content is 40-50%, C4AF content is 15-25%, C2S content is 20-30%, and the dihydrate gypsum content is 12-18% of the amount of sulfoaluminate cement clinker.

3. The two-component mortar based on sulfoaluminate cement resistant to high concentrations of chloride, sulfate, and magnesium salt corrosion according to claim 1, characterized in that: The retarder is either borax or boric acid.

4. The two-component mortar based on sulfoaluminate cement resistant to high concentrations of chloride, sulfate, and magnesium salt corrosion according to claim 1, characterized in that: The clean dry sand is river sand or lake sand that has been washed three times and then dried or air-dried, and can be fine sand, medium sand, coarse sand, or Chinese ISO standard sand.

5. The two-component mortar based on sulfoaluminate cement for resisting corrosion by high concentrations of chloride, sulfate, and magnesium salts according to claim 1, characterized in that: The water-reducing agent is a polycarboxylate water-reducing agent.

6. The two-component mortar based on sulfoaluminate cement for resisting corrosion by high concentrations of chloride, sulfate, and magnesium salts according to claim 1, characterized in that: The silicate cement clinker is the clinker used in the production of silicate cement.

7. The two-component mortar based on sulfoaluminate cement for resisting corrosion by high concentrations of chloride, sulfate, and magnesium salts according to claim 1, characterized in that: The corrosion resist is composed of sodium tripolyphosphate and sodium potassium tartrate in a mass ratio of 1:2, 1:1, or 2:

1.

8. A method for preparing a two-component mortar resistant to high concentrations of chloride, sulfate, and magnesium salt corrosion based on sulfoaluminate cement, characterized in that: Specifically, the steps include the following: (1) Grind silicate cement clinker in a ball mill until the residue on an 80-micron sieve is less than 10%; (2) Dry mix sulfoaluminate cement, silica fume, slag, meta-high terephthalic acid, silicate cement clinker and clean dry sand in a mixer for 3-4 minutes to make them evenly mixed and obtain mineral components; (3) Mix the retarder, corrosion inhibitor and water-reducing agent evenly to obtain the chemical admixture component; (4) At the construction site, dry mix the mineral components obtained in step (2) and the chemical additive components obtained in step (3) in a mixer for 3-4 minutes, then add water according to the ratio, and continue to mix in the mixer for 3-4 minutes before mortar construction.

9. A method for preparing a two-component mortar resistant to high concentration chloride, sulfate and magnesium salt corrosion based on sulfoaluminate cement according to claim 8, characterized in that: The ratio described in step (4) is a water-to-glue ratio of no more than 0.

4.

10. A method for preparing a two-component mortar resistant to high concentrations of chloride, sulfate, and magnesium salt corrosion based on sulfoaluminate cement according to claim 8, characterized in that: The retarder, corrosion inhibitor, and water-reducing agent mentioned above are all in powder form.

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