Calcium formate-potassium bicarbonate synergistically induced calcium sulfoaluminate clinker-active magnesium oxide-metakaolin integrated self-healing concrete material and preparation method thereof

Abstract

The application belongs to the technical field of construction materials, and particularly relates to a calcium formate-potassium bicarbonate synergistically induced calcium sulfoaluminate clinker-active magnesium oxide-metakaolin integrated self-healing concrete material and a preparation method thereof. In the integrated self-healing concrete material, inorganic additive materials are used, so that the problems of cost, stability and construction adaptation possibly caused by a system of bacteria, microcapsules, organic polymers, water glass and super water-absorbing resin are avoided. Through content matching of calcium sulfoaluminate clinker, active magnesium oxide, metakaolin, anhydrous gypsum, calcium formate, potassium bicarbonate and nano calcium carbonate, multiple mechanism synergies such as ettringite filling, magnesium matrix volume compensation, secondary gel densification and carbonate nucleation deposition are realized, the integrated self-healing concrete material can be directly used as a part of cementitious materials, and in the case of crack water, wet-dry cycle or high humidity environment, the healing product can be generated at the crack, so that the crack sealing effect and the later anti-permeability recovery ability are improved.

Description

Technical Field

[0001] This invention belongs to the field of construction materials technology, specifically relating to an integrated self-healing concrete material of calcium sulfoaluminate clinker-active magnesium oxide-metakaolin synergistically induced by calcium formate-potassium bicarbonate and its preparation method. Background Technology

[0002] Cement-based materials and concrete structures are susceptible to microcracks during service due to factors such as drying shrinkage, temperature changes, external loads, freeze-thaw cycles, chemical corrosion, and construction defects. Once these cracks form, harmful media such as moisture, oxygen, carbon dioxide, chloride ions, and sulfate ions can penetrate the concrete along the cracks, leading to steel corrosion, interface weakening, increased leakage, and decreased durability. Therefore, improving the self-healing ability of concrete materials to microcracks is a crucial technical requirement for underground engineering, tunnel lining, bridge deck paving, marine structures, prefabricated components, and impermeable concrete.

[0003] Existing self-healing concrete technologies mainly include bacterial-induced mineralization, microencapsulated healing agents, added sodium silicate or polymer healing agents, superabsorbent resin water storage and expansion, and single mineral expansion agent systems. While these technologies can promote crack closure under certain conditions, they still have several shortcomings: First, bacterial systems have high requirements for environment, nutrient sources, alkalinity, and long-term activity, making engineering stability and cost control difficult; second, microencapsulation systems are complex to prepare, the capsules are easily damaged during mixing and construction, and the healing agent is difficult to reuse after release; third, the compatibility, long-term durability, and cost of sodium silicate, polymer, or organic encapsulated healing agents with conventional cement-based systems are uncertain; fourth, single expansion agent or single mineral deposition systems usually rely on only one reaction pathway, which can easily lead to slow crack closure, insufficient density of the healing product, and insufficient post-treatment impermeability recovery. Summary of the Invention

[0004] This invention aims to provide an integrated self-healing concrete material and its preparation method, which is synergistically induced by calcium formate and potassium bicarbonate, consisting of calcium sulfoaluminate clinker, active magnesium oxide, and metakaolin. This self-healing concrete material addresses the problems of existing self-healing concrete systems, such as high cost, insufficient construction compatibility, difficulty in ensuring long-term stability, and limited effectiveness of single healing mechanisms. It provides a self-healing concrete additive combination with specific inorganic additive materials and their content range as the core. This additive combination can induce the generation of multiple healing products in structures under conditions of water ingress into cracks or wet-dry cycles, thereby achieving autonomous closure of microcracks and restoration of impermeability.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A self-healing concrete material integrating calcium sulfoaluminate clinker, active magnesium oxide, and metakaolin, synergistically induced by calcium formate and potassium bicarbonate, is provided, comprising the following components by weight: 55-75 parts of silicate cement and / or ordinary silicate cement, 8-15 parts of calcium sulfoaluminate clinker, 4-10 parts of active magnesium oxide, 8-18 parts of metakaolin, 3-8 parts of anhydrous gypsum, 1-4 parts of calcium formate, 0.3-1.5 parts of potassium bicarbonate, and 0.5-3 parts of nano-calcium carbonate.

[0006] Preferably, by weight, each component can be controlled within the following range: 60-70 parts of silicate cement and / or ordinary silicate cement, 10-14 parts of calcium sulfoaluminate clinker, 5-8 parts of active magnesium oxide, 9-12 parts of metakaolin, 4-6 parts of anhydrous gypsum, 1.2-2.5 parts of calcium formate, 0.5-1.2 parts of potassium bicarbonate, and 0.8-1.5 parts of nano-calcium carbonate.

[0007] The calcium sulfoaluminate clinker-activated magnesium oxide-metakaolin integrated self-healing concrete material synergistically induced by calcium formate and potassium bicarbonate contains calcium sulfoaluminate clinker, activated magnesium oxide, metakaolin, anhydrous gypsum, calcium formate, potassium bicarbonate, and nano-calcium carbonate. This is an inorganic additive combination for self-healing concrete or self-healing mortar. This additive combination, together with silicate cement and / or ordinary silicate cement, constitutes a cementitious system. The content range and main functions of each component in this additive combination are shown in Table 1 below. 1 Calcium sulfoaluminate clinker 8～15 10～14 Anhydrous gypsum continues to form ettringite after water enters the cracks, filling them and promoting volume compensation. 2 Active magnesium oxide 4～10 5～8 The subsequent slow-release hydration generates magnesium hydroxide, which provides volume compensation and pore filling. 3 metakaolin 8～18 9～12 A volcanic ash reaction occurs, forming a secondary gel that increases the density of the healing area. 4 Anhydrous gypsum 3～8 4～6 Provides sulfate source for the formation of ettringite from calcium sulfoaluminate clinker. 5 Calcium formate 1～4 1.2～2.5 Promotes early and late-stage reactions in the system, synergistically inducing active magnesium oxide hydration and crack repair. 6 Potassium bicarbonate 0.3～1.5 0.5～1.2 Providing carbonate deposition conditions in fractured water environments promotes the formation of carbonate healing products. 7 Nano calcium carbonate 0.5～3 0.8～1.5 As a nucleating and microfilling material, it promotes carbonate deposition and microstructure densification. Furthermore, to ensure the synergistic relationship between the additives, the mass ratio of calcium sulfoaluminate clinker to anhydrous gypsum can be controlled at 2:1 to 4:1; the mass ratio of calcium formate to active magnesium oxide can be controlled at 1:2 to 1:8; and the mass ratio of potassium bicarbonate to nano calcium carbonate can be controlled at 1:0.5 to 1:5.

[0008] Furthermore, the active magnesium oxide is preferably lightly calcined magnesium oxide with an average particle size of 5–50 μm; the nano-calcium carbonate has an average particle size of 20–200 nm.

[0009] This calcium formate-potassium bicarbonate synergistic-induced calcium sulfoaluminate clinker-active magnesium oxide-metakaolin integrated self-healing concrete material does not rely on bacteria, microcapsules, organic polymers or post-injection devices. Instead, through the synergistic design of specific material types and specific content ranges, it enables the concrete to generate ettringite, magnesium hydroxide, secondary gel and carbonate deposits after the cracks come into contact with water, thereby achieving crack sealing and structural densification repair.

[0010] The integrated self-healing concrete material of calcium sulfoaluminate clinker-active magnesium oxide-metakaolin synergistically induced by calcium formate-potassium bicarbonate can be prepared by dry powder premixing or added together with cement, sand, stone, water and water-reducing agent during on-site mixing.

[0011] The premixed preparation method includes the following steps: S1: Weigh out silicate cement and / or ordinary silicate cement, calcium sulfoaluminate clinker, activated magnesium oxide, metakaolin, anhydrous gypsum, calcium formate, potassium bicarbonate and nano calcium carbonate according to the previous formula.

[0012] S2: First, silicate cement and / or ordinary silicate cement, calcium sulfoaluminate clinker, active magnesium oxide, metakaolin, anhydrous gypsum and nano calcium carbonate are premixed for 3 to 10 minutes.

[0013] S3: Add calcium formate and potassium bicarbonate and continue mixing for 2 to 8 minutes to obtain an integrated self-healing cementitious material or a dry powder material for self-healing concrete.

[0014] The resulting material can be stored in moisture-proof packaging, or it can be directly mixed with mixing water, fine aggregate (sand), and optional coarse aggregate (gravel) to prepare self-healing mortar or self-healing concrete.

[0015] When preparing mortar or concrete, the water-cement ratio can be 0.28–0.45. A polycarboxylate superplasticizer can be added, at a dosage of 0.15%–0.8% of the cementitious material mass. The above-mentioned water-cement ratio, superplasticizer, aggregate gradation, mixing, pouring, and curing conditions can all be adjusted according to conventional concrete construction techniques.

[0016] In the above scheme, the cement matrix of the integrated self-healing concrete material of calcium sulfoaluminate clinker-active magnesium oxide-metakaolin synergistically induced by calcium formate-potassium bicarbonate can be silicate cement, ordinary silicate cement, or a mixture of the two; it can also be used together with some mineral admixtures according to engineering needs without substantially changing the synergistic effect of the additive combination of the present invention. Lightly calcined magnesium oxide is preferred for the active magnesium oxide, but magnesium oxide materials with similar post-hydration activity can also be used, but their particle size and reactivity should meet the needs of post-release slow-release expansion and crack filling. Nano-calcium carbonate can be nano-sized calcium carbonate with different crystal forms or different surface states, as long as its particle size range and nucleation and filling effect meet the requirements. The mixing method can be pre-mixing dry powder in the factory, step-by-step feeding on site, or mixing with cement and aggregates. The water-cement ratio, aggregate gradation, water-reducing agent dosage, and curing conditions of the mortar or concrete can be adjusted according to engineering requirements.

[0017] This calcium formate-potassium bicarbonate synergistic-induced calcium sulfoaluminate clinker-activated magnesium oxide-metakaolin integrated self-healing concrete material can be directly mixed into ordinary cement-based materials and does not contain polyvinyl alcohol, sodium silicate, self-healing bacteria, nutrient sources, microencapsulated healing agents, superabsorbent resins, or other organically encapsulated healing agents. Compared with the prior art, the beneficial effects of this invention include: 1. This integrated self-healing concrete material uses inorganic additives, avoiding the cost, stability, and construction compatibility issues that may arise from systems such as bacteria, microcapsules, organic polymers, water glass, and superabsorbent resins.

[0018] 2. This integrated self-healing concrete material achieves synergistic effects of multiple mechanisms, including calciferite filling, magnesium-based volume compensation, secondary gel densification, and carbonate nucleation deposition, through the matching of the contents of calcium sulfoaluminate clinker, active magnesium oxide, metakaolin, anhydrous gypsum, calcium formate, potassium bicarbonate, and nano-calcium carbonate.

[0019] 3. This integrated self-healing concrete material can be used directly as part of the cementitious material without the need for pre-embedded pipes, post-injection, capsule rupture triggering, or special carriers, making it compatible with conventional mortar and concrete preparation processes.

[0020] 4. This integrated self-healing concrete material can promote the generation of healing products at the crack when the crack is exposed to water, in wet-dry cycles, or in high-humidity environments, thereby improving the crack sealing effect and the ability to restore impermeability in the later stage.

[0021] 5. This integrated self-healing concrete material can be widely used in various application scenarios such as tunnel lining, underground engineering, bridge deck paving, anti-seepage concrete, repair mortar, shotcrete and prefabricated concrete components. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a functional illustration of different self-healing additives in an embodiment of the integrated self-healing concrete material of calcium sulfoaluminate clinker-active magnesium oxide-metakaolin synergistically induced by calcium formate-potassium bicarbonate of the present invention.

[0023] Figure 2 These are before-and-after images of an integrated self-healing concrete material, synergistically induced by calcium formate and potassium bicarbonate, comprising calcium sulfoaluminate clinker, active magnesium oxide, and metakaolin, as described in this invention, in an engineering application. Figure 2 - (a) is an image of the crack that appeared. Figure 2 - (b) is a picture of the crack after it healed from water ingress.

[0024] Figure 3 This is a schematic diagram comparing the performance of an embodiment of the integrated self-healing concrete material of calcium sulfoaluminate clinker-active magnesium oxide-metakaolin synergistically induced by calcium formate-potassium bicarbonate of the present invention with that of ordinary concrete material.

[0025] Figure 4This is a flowchart illustrating the preparation process of an embodiment of the integrated self-healing concrete material of calcium sulfoaluminate clinker-active magnesium oxide-metakaolin synergistically induced by calcium formate-potassium bicarbonate according to the present invention. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0027] A self-healing concrete material integrating calcium sulfoaluminate clinker, activated magnesium oxide, and metakaolin, synergistically induced by calcium formate and potassium bicarbonate, comprises the following components by weight: 650g silicate cement, 120g calcium sulfoaluminate clinker, 60g activated magnesium oxide, 100g metakaolin, 40g anhydrous gypsum, 15g calcium formate, 8g potassium bicarbonate, and 7g nano-calcium carbonate.

[0028] The integrated self-healing concrete material of calcium formate-potassium bicarbonate synergistic-induced calcium sulfoaluminate clinker-active magnesium oxide-metakaolin in this embodiment is suitable for construction scenarios of structures under normal circumstances.

[0029] Combination Figure 1 As shown in this embodiment, the functions of the relevant components of the integrated self-healing concrete material of calcium sulfoaluminate clinker-active magnesium oxide-metakaolin synergistically induced by calcium formate-potassium bicarbonate are as follows: calcium sulfoaluminate clinker provides material for the later formation of ettringite; active magnesium oxide is used for slow-release hydration expansion; metakaolin is used to promote secondary gel formation; anhydrous gypsum is used to provide sulfate ions and synergistically form ettringite; calcium formate is used to promote the hydration of active magnesium oxide; potassium bicarbonate is used to promote carbonate deposition; and nano-calcium carbonate is used for nucleation, filling, and densification.

[0030] Combination Figure 2 As shown in this embodiment, the integrated self-healing concrete material of calcium sulfoaluminate clinker-active magnesium oxide-metakaolin synergistically induced by calcium formate-potassium bicarbonate is applied in engineering. When cracks appear, they can self-heal after water enters the cracks.

[0031] Combination Figure 3As shown in the experiment, compared with conventional concrete on the market, the integrated self-healing concrete material of calcium sulfoaluminate clinker-active magnesium oxide-metakaolin synergistically induced by calcium formate-potassium bicarbonate in this embodiment has the following advantages in terms of technical specifications when applied in engineering: shortened setting time; enhanced resistance to seepage pressure, compressive strength, and flexural strength; improved flexibility (lateral deformation capacity); and enhanced bond strength.

[0032] Combination Figure 4 As shown in this embodiment, the preparation method of the integrated self-healing concrete material of calcium sulfoaluminate clinker-active magnesium oxide-metakaolin synergistically induced by calcium formate-potassium bicarbonate is as follows: S1: Weigh out 650g of silicate cement, 120g of calcium sulfoaluminate clinker, 60g of activated magnesium oxide, 100g of metakaolin, 40g of anhydrous gypsum, 15g of calcium formate, 8g of potassium bicarbonate, and 7g of nano calcium carbonate according to the formula.

[0033] S2: First, silicate cement, calcium sulfoaluminate clinker, active magnesium oxide, metakaolin, anhydrous gypsum and nano calcium carbonate are premixed for 3 to 10 minutes.

[0034] S3: Add calcium formate and potassium bicarbonate and continue mixing for 2 to 8 minutes to obtain an integrated self-healing gelling material.

[0035] S4: The resulting gelling material should be stored in moisture-proof packaging.

[0036] The 1000g of calcium formate-potassium bicarbonate synergistic-induced calcium sulfoaluminate clinker-active magnesium oxide-metakaolin integrated self-healing concrete material formed by the above preparation method is a cementing material. This cementing material can be used as a dry powder material for self-healing concrete or for processing self-healing mortar.

[0037] The packaging of this cementitious material is for convenient direct use. During construction, the mixed cementitious material can also be used directly on-site to process mortar or concrete, as needed. When processing self-healing mortar, the cementitious material is mixed together with mixing water, fine aggregate (sand), and water-reducing agent; when processing self-healing concrete, the cementitious material is mixed together with mixing water, fine aggregate (sand), coarse aggregate (gravel), and water-reducing agent.

[0038] When this cementitious material is used to process mortar or concrete, the water-cement ratio can be 0.28 to 0.45; polycarboxylate superplasticizer can be added, with a dosage of 0.15% to 0.8% of the cementitious material mass.

[0039] The water-cement ratio, water-reducing agent, aggregate gradation, mixing, and subsequent pouring and curing conditions mentioned above can all be adjusted according to conventional mortar or concrete construction processes.

[0040] for example: When processing self-healing mortar, add 2000g of standard sand, 330g of mixing water and 4g of polycarboxylate superplasticizer to 1000g of this cementitious material, and mechanically stir for 3-5 minutes. The processed self-healing mortar can be used in structures. After the self-healing mortar is formed, standard curing is required.

[0041] When processing self-healing concrete, add 1000g of this cementitious material to 1000g of standard sand, 2000g of standard gravel, 410g of mixing water and 6g of polycarboxylate superplasticizer, and mechanically mix for 3-5 minutes. The processed self-healing concrete can be used in structures. After the self-healing concrete is formed, standard curing is sufficient. Example 2

[0042] A self-healing concrete material integrating calcium sulfoaluminate clinker, activated magnesium oxide, and metakaolin, synergistically induced by calcium formate and potassium bicarbonate, comprises the following components by weight: 600g silicate cement, 140g calcium sulfoaluminate clinker, 80g activated magnesium oxide, 100g metakaolin, 50g anhydrous gypsum, 15g calcium formate, 8g potassium bicarbonate, and 7g nano-calcium carbonate. These components are mixed according to the method described in Example 1 above to form 1000g of the integrated self-healing cementitious material.

[0043] The integrated self-healing concrete material of calcium sulfoaluminate clinker-active magnesium oxide-metakaolin synergistically induced by calcium formate-potassium bicarbonate in this embodiment is suitable for engineering scenarios with high requirements for crack closure and subsequent impermeability restoration. Example 3

[0044] A self-healing concrete material integrating calcium sulfoaluminate clinker, activated magnesium oxide, and metakaolin, synergistically induced by calcium formate and potassium bicarbonate, comprises the following components by weight: 700g ordinary silicate cement, 100g calcium sulfoaluminate clinker, 50g activated magnesium oxide, 90g metakaolin, 35g anhydrous gypsum, 12g calcium formate, 6g potassium bicarbonate, and 7g nano-calcium carbonate. These components are mixed according to the method described in Example 1 above to form 1000g of the integrated self-healing concrete material.

[0045] The integrated self-healing concrete material of calcium sulfoaluminate clinker-active magnesium oxide-metakaolin synergistically induced by calcium formate-potassium bicarbonate in this embodiment is suitable for engineering scenarios that balance mechanical properties and self-healing properties. Example 4

[0046] The application of cementitious materials in the processing of self-healing concrete, wherein the cementitious materials are derived from the calcium formate-potassium bicarbonate synergistically induced calcium sulfoaluminate clinker-active magnesium oxide-metakaolin integrated self-healing concrete material in Example 3.

[0047] Take 420-460 kg of cementitious material, 650-800 kg of fine aggregate (sand), and 950-1150 kg of coarse aggregate (gravel). Control the mixing water according to the water-cement ratio of 0.32-0.40. Add polycarboxylate superplasticizer at 0.2%-0.6% of the cementitious material mass. Mix according to conventional concrete technology to obtain self-healing concrete. This self-healing concrete can be used in construction projects and can be poured, vibrated, and cured according to conventional concrete technology.

[0048] In the above embodiments, the self-healing mechanism of the integrated self-healing concrete material of calcium sulfoaluminate clinker-active magnesium oxide-metakaolin synergistically induced by calcium formate and potassium bicarbonate mainly originates from the synergistic effect of the additive combination. After crack formation, when moisture enters the crack area, calcium sulfoaluminate clinker continues to react with anhydrous gypsum to generate ettringite, which can grow in cracks and pores and provide a filling effect. Activated magnesium oxide undergoes late-stage hydration under the promotion of calcium formate to generate magnesium hydroxide and provide volume compensation. Metakaolin reacts with the calcium source in the system with volcanic ash to generate secondary gel, improving the compactness of the crack healing zone. Potassium bicarbonate provides carbonate deposition conditions, and nano-calcium carbonate, as a nucleating and micro-filling component, promotes the deposition of carbonate healing products in the crack area. After the above effects are combined, crack sealing, pore refinement, and restoration of impermeability can be achieved.

[0049] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A self-healing concrete material integrating calcium sulfoaluminate clinker-activated magnesium oxide-metakaolin, characterized by: (The text abruptly ends here, so the translation also ends here.) It includes the following components by weight: 55-75 parts silicate cement and / or ordinary silicate cement, 8-15 parts calcium sulfoaluminate clinker, 4-10 parts activated magnesium oxide, 8-18 parts metakaolin, 3-8 parts anhydrous gypsum, 1-4 parts calcium formate, 0.3-1.5 parts potassium bicarbonate, and 0.5-3 parts nano calcium carbonate.

2. The integrated self-healing concrete material of calcium sulfoaluminate clinker-active magnesium oxide-metakaolin synergistically induced by calcium formate-potassium bicarbonate as described in claim 1, characterized in that: It includes the following components by weight: 60-70 parts silicate cement and / or ordinary silicate cement, 10-14 parts calcium sulfoaluminate clinker, 5-8 parts activated magnesium oxide, 9-12 parts metakaolin, 4-6 parts anhydrous gypsum, 1.2-2.5 parts calcium formate, 0.5-1.2 parts potassium bicarbonate, and 0.8-1.5 parts nano calcium carbonate.

3. The integrated self-healing concrete material of calcium sulfoaluminate clinker-active magnesium oxide-metakaolin synergistically induced by calcium formate-potassium bicarbonate as described in claim 1, characterized in that: The mass ratio of calcium sulfoaluminate clinker to anhydrous gypsum is controlled at 2:1 to 4:1; the mass ratio of calcium formate to active magnesium oxide is controlled at 1:2 to 1:8; and the mass ratio of potassium bicarbonate to nano calcium carbonate is controlled at 1:0.5 to 1:

5.

4. The integrated self-healing concrete material of calcium sulfoaluminate clinker-active magnesium oxide-metakaolin synergistically induced by calcium formate-potassium bicarbonate according to claim 1, characterized in that: The active magnesium oxide is lightly calcined magnesium oxide with an average particle size of 5–50 μm; the nano-calcium carbonate has an average particle size of 20–200 nm.

5. A method for preparing an integrated self-healing concrete material of calcium sulfoaluminate clinker-activated magnesium oxide-metakaolin synergistically induced by calcium formate-potassium bicarbonate, characterized in that, This method uses a dry powder premixing process, including: According to claim 1, the formulation components of the integrated self-healing concrete material of calcium sulfoaluminate clinker-active magnesium oxide-metakaolin synergistically induced by calcium formate-potassium bicarbonate are weighed as follows: silicate cement and / or ordinary silicate cement, calcium sulfoaluminate clinker, active magnesium oxide, metakaolin, anhydrous gypsum, calcium formate, potassium bicarbonate and nano calcium carbonate. First, the silicate cement and / or ordinary silicate cement, calcium sulfoaluminate clinker, activated magnesium oxide, metakaolin, anhydrous gypsum and nano calcium carbonate are premixed. Then add the calcium formate and potassium bicarbonate and continue mixing to obtain an integrated self-healing gelling material.

6. The preparation method of the integrated self-healing concrete material of calcium sulfoaluminate clinker-active magnesium oxide-metakaolin synergistically induced by calcium formate-potassium bicarbonate according to claim 5, characterized in that: The premixing time is 3 to 10 minutes; the continued mixing time is 2 to 8 minutes.

7. The preparation method of the integrated self-healing concrete material of calcium sulfoaluminate clinker-active magnesium oxide-metakaolin synergistically induced by calcium formate-potassium bicarbonate as described in claim 5, characterized in that: The prepared gelling material is stored in moisture-proof packaging.

8. The application of the cementitious material prepared by any of the preparation methods in claims 5-7 in the processing of self-healing mortar or self-healing concrete.

9. The application according to claim 8, characterized in that: When processing the self-healing mortar or self-healing concrete, the water-cement ratio can be 0.28 to 0.

45.

10. The application according to claim 8, characterized in that: When processing the self-healing mortar or self-healing concrete, a polycarboxylate superplasticizer is added at a dosage of 0.15% to 0.8% of the mass of the cementitious material.

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