Concrete crack self-repairing material based on microorganism synergistic mineralization and application

Abstract

The invention relates to the technical field of repairing materials, and discloses a concrete crack self-repairing material based on microorganism synergistic mineralization and application, the concrete crack self-repairing material comprises a microbial population, the microbial population is composed of basophilic calcium carbonate generating bacteria, urea hydrolytic bacteria and silicate mineralizing bacteria, and the microbial population is used for generating calcium carbonate and calcium silicate minerals in an alkaline environment; repairing concrete cracks; the microcapsules are used for responding to humidity or temperature changes in the crack environment and releasing microbial populations and mineralization activating factors; a mineral carrier comprising bentonite, zeolite or magnesium silicate, for carrying a population of microorganisms and providing an attachment surface; and the repair activation particles can start mineralization reaction when the crack occurs to fill the crack. By increasing the proportion of microbial populations, the survival and activation conditions of microorganisms are optimized, the rate of mineralization reaction is improved, and the acceleration of the crack repair process is realized, so that the effect of remarkably improving the repair speed is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of repair materials, and in particular to concrete crack self-repairing materials based on microbial synergistic mineralization and applications. Background Art

[0002] Concrete is a vital material widely used in buildings, bridges, and other infrastructure. However, it is susceptible to environmental erosion during use, leading to the formation of cracks. Cracks not only affect the structural strength of concrete but also accelerate the penetration of moisture and chemicals, further damaging its durability. Therefore, effectively repairing cracks and improving concrete's self-healing capabilities have become key issues in current concrete research.

[0003] In recent years, concrete self-healing technology based on microbial co-mineralization has attracted widespread attention. This technology involves the introduction of a specific microbial population. Once cracks form, they utilize their biomineralization to generate minerals such as calcium carbonate to fill the cracks, thereby achieving self-healing. This technology offers advantages such as environmental friendliness, low cost, and long-term self-healing properties, making it particularly suitable for concrete structures subject to long-term use and environmental influences.

[0004] Optimizing the proportion of microbial communities is one of the keys to improving self-healing effects. As the proportion of microbial communities increases, the rate of microbial activity also increases, accelerating the mineralization reaction. Microbial colonization and mineralization reactions in cracked areas can effectively fill cracks and enhance the strength of the repaired area, significantly increasing the repair speed. However, when the concentration of the microbial community is too low, the repair speed is slow and may not completely cover the crack, resulting in limited repair effects. Therefore, optimizing the proportion of microbial communities to increase the mineralization reaction rate is an important research direction for improving the performance of self-healing materials. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides concrete crack self-repair materials and applications based on microbial synergistic mineralization, which solves the problems in the existing technology that the survival rate, activation conditions and environmental adaptability of microorganisms are relatively complex, and the survival and activity of microorganisms are easily inhibited in the closed and highly alkaline environment of concrete.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a concrete crack self-repairing material based on microbial synergistic mineralization, comprising:

[0007] A microbial community composed of alkaliphilic calcium carbonate-producing bacteria, urea-hydrolyzing bacteria, and silicate mineralizing bacteria, the microbial community is used to generate calcium carbonate and calcium silicate minerals in an alkaline environment to repair concrete cracks;

[0008] Microcapsules, wherein the shell of the microcapsules is made of a composite of polylactic acid and polyethylene glycol, and are used to respond to humidity or temperature changes in a crack environment and release microbial populations and mineralization activation factors;

[0009] a mineral carrier comprising bentonite, zeolite or magnesium silicate for supporting a microbial population and providing an attachment surface;

[0010] The repair activation particles are composed of calcium silicate and calcium phosphate and can initiate a mineralization reaction when cracks occur to fill the cracks.

[0011] Preferably, the weight percentages of the various materials are as follows: the microbial population: 2%-10%, wherein the microbial population comprises 40%-50% of alkaliphilic calcium carbonate-producing bacteria, 30%-40% of urea-hydrolyzing bacteria, and 10%-30% of silicate mineralizing bacteria;

[0012] The microcapsules are composed of 2%-5%, wherein the microcapsules are composed of 70-80% polylactic acid and 20-30% polyethylene glycol, 5%-15% mineral carriers, and 2%-8% repair activation particles, wherein the repair activation particles are composed of 60%-80% calcium silicate and 20%-40% calcium phosphate.

[0013] The application of a concrete crack self-repairing material based on microbial synergistic mineralization includes the following steps: preparing a self-repairing material according to a required amount, and after preparation, mixing the material with a cement-based material in a specified proportion to obtain a concrete material;

[0014] The concrete material is poured into shape, and the humidity is maintained above 90% under curing conditions. The curing time is 28-30 days, and the activity of the microbial community;

[0015] When cracks appear in concrete, moisture or air from the external environment enters the crack area, activating the degradation process of the microcapsules and releasing microbial communities and mineralization activation factors;

[0016] The microbial community produces calcium carbonate and calcium silicate minerals through mineralization reactions, filling cracks and repairing concrete.

[0017] Preferably, the microcapsules degrade under changes in humidity or temperature, releasing microbial populations and mineralization activation factors to promote the production of calcium carbonate and calcium silicate minerals.

[0018] Preferably, the mineral carrier enables the microbial population to exist stably in the concrete for a long time by providing an attachment surface, and play a role in the crack repair process.

[0019] Preferably, the repair activation particles release calcium silicate and calcium phosphate to initiate a mineralization reaction when cracks occur, fill the cracks, and enhance the repair effect of the concrete. After the cracks occur, the self-repairing material performs multiple self-repairs through the synergistic action of the microbial community and the mineralization activation factor.

[0020] Preferably, the structure of the self-repairing concrete can be repeatedly repaired when cracks occur and can remain repaired under different environments.

[0021] Preferably, the mass ratio of the microbial population in the concrete material is 1%-10%, the mass ratio of the microcapsules is 1%-5%, the mass ratio of the mineral carrier is 5%-15%, and the mass ratio of the repair activation particles is 2%-8%, and the concrete material is cast after being uniformly mixed;

[0022] Based on the concrete crack self-repairing material of microbial synergistic mineralization, a self-repairing concrete structure is produced. After the crack occurs, the structure can fill and repair the crack through the synergistic action of microorganisms and mineralization activation factors.

[0023] The present invention provides a concrete crack self-repairing material based on microbial synergistic mineralization and its application. It has the following beneficial effects:

[0024] 1. The present invention optimizes the survival and activation conditions of microorganisms by increasing the proportion of microbial populations, improves the rate of mineralization reaction, and accelerates the crack repair process, thereby significantly improving the repair speed.

[0025] 2. The present invention promotes the deposition and aggregation of minerals by adjusting the proportion of microbial populations and matching with mineral carriers, thereby forming a harder mineral structure in the crack repair area and achieving a significantly enhanced repair strength effect.

[0026] 3. The present invention optimizes the distribution density of the microbial community to make the repair effect more uniform and comprehensive, thereby achieving full coverage and repair of the crack area, thereby significantly expanding the repair area.

[0027] 4. The present invention enhances the long-term activity and repair ability of microorganisms by increasing the concentration of microbial populations and the stability of self-repairing materials, thereby achieving long-term self-repair of concrete structures and significantly improving the persistence and durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a diagram of the application process of the concrete crack self-repairing material based on microbial synergistic mineralization of the present invention. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Please see the attached Figure 1 The embodiment of the present invention provides a concrete crack self-repairing material based on microbial collaborative mineralization, comprising:

[0031] A microbial community composed of alkaliphilic calcium carbonate-producing bacteria, urea-hydrolyzing bacteria, and silicate mineralizing bacteria, the microbial community is used to generate calcium carbonate and calcium silicate minerals in an alkaline environment to repair concrete cracks;

[0032] Microcapsules, wherein the shell of the microcapsules is made of a composite of polylactic acid and polyethylene glycol, and are used to respond to humidity or temperature changes in a crack environment and release microbial populations and mineralization activation factors;

[0033] a mineral carrier comprising bentonite, zeolite or magnesium silicate for supporting a microbial population and providing an attachment surface;

[0034] The repair activation particles are composed of calcium silicate and calcium phosphate and can initiate a mineralization reaction when cracks occur to fill the cracks.

[0035] The weight percentages of the various materials are as follows: the microbial population: 2%-10%, wherein the microbial population is composed of 40%-50% of alkaliphilic calcium carbonate-producing bacteria, 30%-40% of urea-hydrolyzing bacteria, and 10%-30% of silicate mineralizing bacteria;

[0036] The microcapsules are composed of 2%-5%, wherein the microcapsules are composed of 70-80% polylactic acid and 20-30% polyethylene glycol, 5%-15% mineral carriers, and 2%-8% repair activation particles, wherein the repair activation particles are composed of 60%-80% calcium silicate and 20%-40% calcium phosphate.

[0037] Specifically, the microbial community is composed of alkaliphilic calcium carbonate-producing bacteria, urea-hydrolyzing bacteria, and silicate mineralizing bacteria. This bacterial community design not only takes into account the adaptability of concrete to alkaline environments, but also realizes the synergistic production of various minerals such as calcium carbonate and calcium silicate. Alkaliphilic bacteria can induce calcium carbonate precipitation, urea-hydrolyzing bacteria further promote the mineralization reaction by decomposing urea, and silicate mineralizing bacteria promote the formation of denser calcium silicate hydrates, thereby improving the strength and stability of later crack repairs. By setting the proportion of their groups (40%-50% of alkaliphilic bacteria, 30%-40% of urea-hydrolyzing bacteria, and 10%-30% of silicate mineralizing bacteria), the repair advantages of each type of bacteria can be accurately exerted at different times;

[0038] To ensure the long-term survival and delayed release of microorganisms inside the structure, a microcapsule system is used. The microcapsule shell is made of a composite of polylactic acid and polyethylene glycol, which can respond to changes in humidity or temperature in the environment, degrade and release the contained microorganisms and mineralization activation factors when cracks occur. This mechanism avoids the inactivation of microorganisms in the early environment of concrete, while achieving precise "crack response" release. The designed ratio of capsule materials is PLA 70%-80% and PEG 20%-30%, which not only ensures structural strength but also provides moderate water sensitivity, and is an important means to ensure microbial activity;

[0039] Mineral carriers in this invention stabilize microbial survival. Porous minerals such as bentonite, zeolite, or magnesium silicate provide a buffering environment for microorganisms to attach and thrive in concrete, enhancing their adaptability and survival rate. These materials possess excellent pore structures and ion exchange capacities, facilitating microbial fixation without compromising the overall performance of the concrete. The carrier addition ratio is 5%-15%, ensuring both biological activity and a balanced mechanical performance.

[0040] In addition, to improve the repair efficiency, repair activation particles are added to the material. They are composed of calcium silicate and calcium phosphate, with a ratio of 60%-80% calcium silicate and 20%-40% calcium phosphate. These particles can quickly release calcium sources in the crack area and synergize with microbial metabolites to form sediments, effectively sealing the cracks. This not only accelerates the mineralization reaction process, but also enhances the density and durability of the repaired structure. Through the systematic integration of microbial selection, carrier design, release mechanism and reaction activation path, an intelligent, collaborative and repeatable self-repair mechanism for concrete cracks is realized, which effectively breaks through the technical bottlenecks of poor timeliness and weak adaptability of traditional single repair paths, and has good prospects for engineering application.

[0041] The application of a concrete crack self-repairing material based on microbial synergistic mineralization includes the following steps: preparing a self-repairing material according to a required amount, and after preparation, mixing the material with a cement-based material in a specified proportion to obtain a concrete material;

[0042] The concrete material is poured into shape, and the humidity is maintained above 90% under curing conditions. The curing time is 28-30 days, and the activity of the microbial community;

[0043] When cracks appear in concrete, moisture or air from the external environment enters the crack area, activating the degradation process of the microcapsules and releasing microbial communities and mineralization activation factors;

[0044] The microbial community produces calcium carbonate and calcium silicate minerals through mineralization reactions, filling cracks and repairing concrete.

[0045] Specifically, through their own unique metabolic pathways, they induce mineralization reactions, synergistically generate inorganic sediments such as calcium carbonate and calcium silicate, and then gradually fill cracks, reconstruct structural continuity and improve density. Among them, alkaliphilic calcium carbonate-forming bacteria can directly induce Ca2+ to combine with CO32- in the environment to precipitate as calcium carbonate, quickly sealing cracks; urea-hydrolyzing bacteria release CO32- by hydrolyzing urea to further enhance carbonate generation capacity; and silicate mineralizing bacteria use silicon-aluminum sources as reaction matrices to promote the formation of CSH (calcium silicate hydrate)-like structures to form a dense mineral skeleton. This mineralization and deposition reaction under multi-mechanism coupling not only improves the integrity and durability of the repair, but also gives the material cracks spontaneous and sustainable regeneration capabilities, which is the key basis for the present invention to achieve multi-stage, efficient self-repair effects.

[0046] The microcapsules degrade under changes in humidity or temperature, releasing microbial populations and mineralization activation factors to promote the generation of calcium carbonate and calcium silicate minerals.

[0047] Specifically, the microcapsules can undergo directionally degradation when the ambient humidity or temperature changes, thereby achieving the on-demand release of internal functional components. The microcapsule shell is composed of a composite of polylactic acid (PLA) and polyethylene glycol (PEG), and has good biodegradability and water-sensitive responsiveness. When concrete cracks form and external moisture or gas penetrates into the crack area, the capsule structure is triggered by the environment and gradually disintegrates, releasing the encapsulated microbial community and mineralization activation factors. The microorganisms are then activated and begin to induce mineralization reactions; at the same time, activation factors such as calcium sources or nutrients jointly promote the formation of minerals such as calcium carbonate and calcium silicate to fill the crack area. This mechanism realizes a closed-loop process of crack recognition-response-repair, effectively avoiding the premature inactivation of microorganisms in a crack-free state, and is a key design to ensure the timeliness and stability of the self-repair function.

[0048] The mineral carrier enables the microbial population to exist stably in the concrete for a long time by providing an attachment surface, and play a role in the crack repair process.

[0049] Specifically, mineral carriers provide microbial communities with porous, friendly attachment surfaces, enabling them to survive and maintain activity for a long time in the high-alkaline, low-nutrient concrete environment. Carrier materials such as bentonite, zeolite, or magnesium silicate themselves have strong ion exchange capacity and a large specific surface area, which can effectively adsorb and embed microorganisms, forming a local "microecological" environment, thereby alleviating the inhibition of the concrete system on the physiological state of microorganisms. During the pouring and curing of concrete, microorganisms are protected by attaching to the surface of the carrier rather than being directly exposed to strong alkali, which significantly prolongs their latent time. When cracks occur and trigger the release of microcapsules, the microorganisms attached to the carrier can quickly participate in the mineralization reaction and continuously generate sediments such as calcium carbonate and calcium silicate, thereby achieving effective crack sealing and repair. This mechanism not only enhances the stability of microorganisms in the material system, but also improves the continuity and reliability of the repair process.

[0050] The repair activation particles release calcium silicate and calcium phosphate to initiate a mineralization reaction when cracks occur, fill the cracks, and enhance the repair effect of concrete. After cracks occur, the self-repairing material performs multiple self-repairs through the synergistic action of microbial communities and mineralization activation factors.

[0051] Specifically, when cracks occur in concrete, the repair activation particles can quickly release the calcium silicate and calcium phosphate components therein, provide sufficient mineralization reaction matrix in the crack area, and initiate and accelerate the inorganic deposition process. Calcium silicate can form CSH (calcium silicate hydrate) colloids under water seepage conditions, effectively filling microcracks and improving structural density and bonding strength; calcium phosphate can further form precipitates with calcium ions and microbial metabolites in the environment, enhancing early sealing effects and durability. Unlike traditional systems that rely on microorganisms for mineralization alone, the present invention provides immediate reactants at the early stage of cracks through the synergistic mechanism of activated particles and microorganisms, accelerates filling, and maintains the subsequent continuous repair ability of microorganisms. This design enables the self-healing material to not only have a rapid initial response, but also rely on the repeated action of residual or reactivated microbial populations and mineralization factors after multiple cracks occur to achieve multiple rounds of autonomous repair, significantly improving the overall crack resistance and service life of the material, and is a key factor in the present invention to achieve "long-term + multiple" self-healing performance.

[0052] The structure of the self-repairing concrete is capable of repeatedly repairing cracks when they occur and maintaining the repair under different environments.

[0053] Specifically, self-repairing concrete structures have good environmental adaptability and repeated repair capabilities, and can continue to perform self-repair functions under various service conditions. When cracks occur in concrete structures due to repeated stress or environmental changes during use, the microcapsule system embedded in the material can respond to changes in humidity or temperature multiple times to achieve the phased release of microbial communities and mineralization activation factors. At the same time, microorganisms attached to mineral carriers can maintain long-term activity in a state of intermittent activation, ensuring that subsequent cracks can still trigger mineralization reactions. In conjunction with the released activation substances such as calcium silicate and calcium phosphate, deposition is quickly formed in new cracks or expanded crack areas to seal structural defects;

[0054] Furthermore, it exhibits excellent tolerance to diverse environmental conditions, including high humidity, dryness, and temperature fluctuations, ensuring the continued stable operation of its self-repair mechanism. Through the synergy of materials and biological mechanisms, the overall structure achieves a closed-loop effect of crack identification, intelligent response, and repeated repair, providing a robust and adaptive repair capability for long-term service, significantly improving its durability and reliability.

[0055] The concrete material comprises a microbial population at a mass ratio of 1%-10%, microcapsules at a mass ratio of 1%-5%, mineral carriers at a mass ratio of 5%-15%, and repair activation particles at a mass ratio of 2%-8%, and is cast into shape after uniform mixing;

[0056] Based on the concrete crack self-repairing material of microbial synergistic mineralization, a self-repairing concrete structure is produced. After the crack occurs, the structure can fill and repair the crack through the synergistic action of microorganisms and mineralization activation factors.

[0057] Specifically, by proportioning the functional components according to an optimized mass ratio and uniformly mixing them with cement-based materials, a concrete structure with self-repairing capabilities is prepared. The mass ratio of the microbial community is controlled at 1%-10%, ensuring sufficient biological activity without affecting the performance of the concrete matrix; the proportion of microcapsules is 1%-5%, and the targeted release of microorganisms and mineralization activation factors is achieved through an environmentally responsive release mechanism; the addition amount of mineral carriers is 5%-15%, ensuring the long-term stable survival of microorganisms in a high-alkaline environment; the proportion of repair activation particles is 2%-8%, providing timely and effective inorganic reactants when cracks occur, promoting crack sealing;

[0058] Each component is evenly dispersed in the concrete system through a premixing process, and an integrated structural material is formed after pouring and curing. During service, when cracks appear in the structure, moisture or temperature changes in the environment trigger the degradation of the microcapsules, releasing microbial communities and mineralization activation factors, initiating the deposition reaction of calcium carbonate and calcium silicate, and filling the cracked areas. This repair process relies on the synergistic mechanism of microbial metabolism and inorganic material reactions, giving the concrete structure the ability to self-identify, self-respond, and self-repair cracks, effectively extending its service life. This integrated material system not only ensures the mechanical properties of concrete, but also significantly enhances its intelligent repair function. It is a key material foundation for achieving high-durability structural engineering applications.

[0059] Embodiment 1:

[0060] Microbial population: 2%, alkaliphilic calcium carbonate-producing bacteria 40%, urea-hydrolyzing bacteria 30%, silicate mineralizing bacteria 30%;

[0061] Microcapsule: 2%, polylactic acid 70%, polyethylene glycol 30%;

[0062] Mineral carrier: 5%;

[0063] Repair activation particles: 2%, calcium silicate 70%, calcium phosphate 30%.

[0064] Example 2:

[0065] Microbial population: 6%, alkaliphilic calcium carbonate-producing bacteria 45%, urea-hydrolyzing bacteria 35%, silicate mineralizing bacteria 20%;

[0066] Microcapsule: 3.5%, polylactic acid 75%, polyethylene glycol 25%;

[0067] Mineral carrier: 10%;

[0068] Repair activation particles: 5%, calcium silicate 70%, calcium phosphate 30%.

[0069] Example 3:

[0070] Microbial population: 10%, alkaliphilic calcium carbonate-producing bacteria 50%, urea-hydrolyzing bacteria 30%, silicate mineralizing bacteria 20%;

[0071] Microcapsule: 5%, polylactic acid 80%, polyethylene glycol 20%

[0072] Mineral carrier: 15%;

[0073] Repair activation particles: 8%, calcium silicate 60%, calcium phosphate 40%.

[0074] Comparative Example 1:

[0075] Compared with Example 1, the differences are that the microbial population in Example 2 is 6%, while that in Example 1 is 2%; the microcapsules are 3.5%, while that in Example 1 is 2%; the mineral carrier is 10%, while that in Example 1 is 5%; the repair activation particles are 5%, while that in Example 1 is 2%; and the rest are the same.

[0076] Comparative Example 2:

[0077] Compared with Example 1, the differences are that the microbial population in Example 3 is 10%, while that in Example 1 is 2%; the microcapsules are 5%, while that in Example 1 is 2%; the mineral carrier is 15%, while that in Example 1 is 5%; the repair activation particles are 8%, while that in Example 1 is 2%; and the rest are the same.

[0078] Comparative Example 3:

[0079] Compared with Example 2, the differences are that the microbial population in Example 1 is 2%, while that in Example 2 is 6%; the microcapsules are 2%, while that in Example 2 is 3.5%; the mineral carrier is 5%, while that in Example 2 is 10%; the repair activation particles are 2%, while that in Example 2 is 5%; and the rest are the same.

[0080] Table 1: Effect of microbial population ratio on the repair effect of self-healing concrete

[0081]

[0082]

[0083]

[0084]

[0085] Example 3 (10% microbial population) showed the strongest repair effect, with a repair area of 100% at 30 days. Example 1 (2% microbial population) showed the smallest repair area, at 85%. The repair areas of Comparative Examples 1 to 6 were between those of Examples 1 and 3. The proportion of microbial populations directly affects the self-healing ability of concrete. A higher proportion of microbial populations can accelerate the mineralization reaction, improve crack repair, and enhance compressive strength.

[0086] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. Concrete crack self-repairing material based on microbial synergistic mineralization, characterized by: include: A microbial community composed of alkaliphilic calcium carbonate-producing bacteria, urea-hydrolyzing bacteria, and silicate mineralizing bacteria, the microbial community is used to generate calcium carbonate and calcium silicate minerals in an alkaline environment to repair concrete cracks; Microcapsules, wherein the shell of the microcapsules is made of a composite of polylactic acid and polyethylene glycol, and are used to respond to humidity or temperature changes in a crack environment and release microbial populations and mineralization activation factors; a mineral carrier comprising bentonite, zeolite or magnesium silicate for supporting a microbial population and providing an attachment surface; The repair activation particles are composed of calcium silicate and calcium phosphate and can initiate a mineralization reaction when cracks occur to fill the cracks.

2. The concrete crack self-repairing material based on microbial synergistic mineralization according to claim 1 is characterized by: The weight percentages of the various materials are as follows: the microbial population: 2%-10%, wherein the microbial population is composed of 40%-50% of alkaliphilic calcium carbonate-producing bacteria, 30%-40% of urea-hydrolyzing bacteria, and 10%-30% of silicate mineralizing bacteria; The microcapsules are composed of 2%-5%, wherein the microcapsules are composed of 70-80% polylactic acid and 20-30% polyethylene glycol, 5%-15% mineral carriers, and 2%-8% repair activation particles, wherein the repair activation particles are composed of 60%-80% calcium silicate and 20%-40% calcium phosphate.

3. Application of the concrete crack self-repairing material based on microbial synergistic mineralization, applied to the concrete crack self-repairing material based on microbial synergistic mineralization according to any one of claims 1-2, characterized in that: The following steps are involved: Prepare the self-repairing material in the required amount, and after preparation, mix the material with the cement-based material in a specified proportion to obtain a concrete material; The concrete material is poured into shape, and the humidity is maintained above 90% under curing conditions. The curing time is 28-30 days, and the activity of the microbial community; When cracks appear in concrete, moisture or air from the external environment enters the crack area, activating the degradation process of the microcapsules and releasing microbial communities and mineralization activation factors; The microbial community produces calcium carbonate and calcium silicate minerals through mineralization reactions, filling cracks and repairing concrete.

4. The use of the concrete crack self-repairing material based on microbial synergistic mineralization according to claim 3, characterized in that: The microcapsules degrade under changes in humidity or temperature, releasing microbial populations and mineralization activation factors to promote the generation of calcium carbonate and calcium silicate minerals.

5. The use of the concrete crack self-repairing material based on microbial synergistic mineralization according to claim 3, characterized in that: The mineral carrier enables the microbial population to exist stably in the concrete for a long time by providing an attachment surface, and play a role in the crack repair process.

6. The use of the concrete crack self-repairing material based on microbial synergistic mineralization according to claim 3, characterized in that: The repair activation particles release calcium silicate and calcium phosphate to initiate a mineralization reaction when cracks occur, fill the cracks, and enhance the repair effect of concrete. After cracks occur, the self-repairing material performs multiple self-repairs through the synergistic action of microbial communities and mineralization activation factors.

7. The use of the concrete crack self-repairing material based on microbial synergistic mineralization according to claim 3, characterized in that: The structure of the self-repairing concrete is capable of repeatedly repairing cracks when they occur and maintaining the repair under different environments.

8. The use of the concrete crack self-repairing material based on microbial synergistic mineralization according to claim 3, characterized in that: The concrete material comprises a microbial population at a mass ratio of 1%-10%, microcapsules at a mass ratio of 1%-5%, mineral carriers at a mass ratio of 5%-15%, and repair activation particles at a mass ratio of 2%-8%, and is cast into shape after uniform mixing; Based on the concrete crack self-repairing material of microbial synergistic mineralization, a self-repairing concrete structure is produced. After the crack occurs, the structure can fill and repair the crack through the synergistic action of microorganisms and mineralization activation factors.

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