Concrete crack synergistic repairing system and method based on microbial self-repairing

Abstract

The invention discloses a concrete crack synergistic repairing system and method based on microbial self-repairing, and relates to the technical field of civil engineering facility maintenance, and the core technical scheme of the system is that a chemical repairing unit, a biological self-repairing unit and an intelligent operation unit are organically integrated; the chemical repairing unit is responsible for injecting a material into a crack to realize instant structural reinforcement, the biological self-repairing unit is used for inducing calcium carbonate precipitation on the basis of chemical repairing to form a long-acting protective layer, and the intelligent operation unit is responsible for executing or assisting in repairing operation. The problems that in the prior art, due to simple superposition of chemical remediation and biological remediation, construction is complex, the construction period is long, and instant and long-acting remediation function deep coupling cannot be achieved are solved, the synergistic effect of the remediation system is remarkable through collaborative operation of all the units according to a preset program, and the remediation efficiency is improved. And the effects of full-life-cycle repair, great improvement of repair efficiency and economical efficiency and excellent and reliable repair quality are achieved.

Description

Technical Field

[0001] This invention relates to the field of civil engineering facility maintenance technology, specifically to a system and method for the collaborative repair of concrete cracks based on microbial self-healing. Background Technology

[0002] Cracks in concrete structures due to loads and environmental factors are a common and serious problem during long-term service. Currently, there are two main but disparate technical approaches to repairing concrete cracks: one is chemical grouting technology relying on materials such as epoxy resin. This technology can quickly restore the integrity of the structure, but it is a one-time passive repair that cannot cope with subsequent new microcracks and has issues with material compatibility and environmental protection; the other is bioremediation technology based on microbial induced calcium carbonate precipitation (MICP). This technology is green, sustainable, and has self-healing potential, but it has weak repair capabilities for macro-cracks, a long repair cycle, and is difficult to independently undertake engineering repair tasks.

[0003] Chinese patent CN202210255397A discloses a crack repair method combining microbial cement and chemical grouting technology. This method involves pre-preparing a nutrient solution and microbial cement, then attaching a grouting nozzle above the crack in outdoor concrete. The crack surface and the area around the nozzle are sealed with an epoxy coating. While this simple combination of technologies is technically inefficient, it merely represents a sequential layering of processes without forming an organic whole. It fails to address the problems of complex construction processes, long construction periods, and high costs, and it also fails to achieve a deep coupling of repair functions in terms of time (immediate and long-term) and space (internal and surface). Therefore, there is an urgent need in the field for a system-level solution that elevates chemical and biological repair from a "simple combination" to a "deep integration." Summary of the Invention

[0004] The purpose of this invention is to provide a synergistic repair system and method for concrete cracks based on microbial self-healing. This system organically integrates a chemical repair unit, a biological self-healing unit, and an intelligent operation unit. The chemical repair unit injects materials into the cracks to achieve immediate structural reinforcement. The biological self-healing unit induces calcium carbonate precipitation on the basis of chemical repair to form a long-lasting protective layer. The intelligent operation unit is responsible for executing or assisting the repair work. Through the coordinated operation of each unit according to a preset program, the synergistic effect of the repair system is significant, achieving full life-cycle repair, greatly improving repair efficiency and economy, and providing excellent and reliable repair quality, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A microbial self-healing-based synergistic repair system for concrete cracks includes:

[0007] The chemical repair unit is configured to inject a consolidating material into concrete cracks to achieve structural reinforcement.

[0008] The bio-self-healing unit is configured to provide microbial-induced calcium carbonate precipitation in the area after the chemical remediation unit has been activated, in order to form a long-lasting protective layer.

[0009] The intelligent operation unit is configured to perform or assist in the construction operations of the chemical remediation unit and / or the bio-self-remediation unit;

[0010] The chemical repair unit, the biological self-repair unit, and the intelligent operation unit work together through physical integration, functional coupling, or process association, and operate according to a preset repair procedure.

[0011] Preferably, the chemical remediation unit and the bio-self-remediation unit are coupled through material composites. The functional components of the bio-self-remediation unit include microorganisms and their nutrient sources, which are pre-encapsulated in microcapsules and uniformly embedded in the grouting material of the chemical remediation unit.

[0012] Preferably, the bio-self-repair unit comprises a microbial compound agent, which is composed of Bacillus pasteurellii and at least one other microorganism with synergistic mineralization effect in a specific ratio, wherein the other microorganism is alkali-tolerant Pseudomonas.

[0013] Preferably, the intelligent operation unit includes a self-mixing intelligent grouting device, which has an automatic mixing function for two-component grout, as well as an automatic judgment and shutdown function for the grouting endpoint based on real-time pressure feedback.

[0014] A method for synergistic repair of concrete cracks based on microbial self-healing, implemented using a microbial self-healing concrete crack synergistic repair system, includes the following steps:

[0015] Step 1: Use chemical repair units to repair the internal structure of the crack;

[0016] Step 2: Based on structural repair, activate the bio-self-healing unit to induce calcium carbonate deposition on the crack surface, interface and inside the material to form a biomineralized coating;

[0017] Among them, intelligent work units are used to perform at least the structural repair process.

[0018] Preferably, the structural repair and the formation of the biomineralized coating are combined in time, and the structural repair and the implantation of self-repair capabilities are completed simultaneously in a single construction step.

[0019] Preferably, during the structural repair process, the grouting pressure is monitored in real time by an intelligent operation unit, and the grouting endpoint is automatically determined based on the logic that the pressure continues to exceed a set threshold for a predetermined time.

[0020] Preferably, the activation of the biological self-repair unit is automatically triggered based on environmental humidity conditions. When the humidity in the crack area meets the preset requirements, the microbial-induced calcium carbonate precipitation process is activated.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. This invention elevates the three major units of chemical repair, biological self-repair, and intelligent operation from the traditional "simple combination" or "sequential superposition" to a "deeply integrated" system-level solution. This deep synergy is not a mechanical addition of functions, but rather forms a preset optimal repair procedure through physical integration, functional coupling, and process association, resulting in a system synergy effect of "1+1+1>3", achieving the unity of immediate strength restoration and long-term performance guarantee.

[0023] 2. This invention encapsulates the functional components of the biological self-healing unit in microcapsules and pre-embeds them uniformly in the grouting material of the chemical repair unit. This simplifies the traditional multi-step complex process into a one-step construction method, that is, the structural repair and self-healing capability are implanted simultaneously in a single grouting operation. This not only shortens the construction period but also reduces material waste and greatly improves repair efficiency and economy.

[0024] 3. This invention uses a compound bacterial agent composed of Bacillus pasteurellii and alkali-resistant Pseudomonas aeruginosa. Through the synergistic effect between the bacterial species, this innovation significantly improves the efficiency of the biomineralization process and the performance of the formed calcium carbonate coating. Even in the step-by-step implementation mode with chemical repair, it can provide the repaired structure with stronger and more durable long-term surface protection and self-healing ability, thereby enhancing the excellence and reliability of the entire system's repair effect. Attached Figure Description

[0025] Figure 1 This is a system structure diagram of the present invention;

[0026] Figure 2 This is a schematic diagram of the system repair process of the present invention. Detailed Implementation

[0027] 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.

[0028] To address the issues of complex construction, long construction periods, and inability to achieve deep coupling of immediate and long-term repair functions resulting from the simple superposition of chemical and biological remediation in existing technologies, please refer to... Figure 1-2 The following technical solutions are provided:

[0029] Example 1

[0030] The repair system consists of three core units: a chemical repair unit, a biological self-repair unit, and an intelligent operation unit.

[0031] The core function of the chemical repair unit is to use grouting materials such as two-component epoxy resin to internally fill and structurally reinforce concrete cracks in order to quickly restore the integrity of the concrete.

[0032] The bio-self-healing unit relies on biological agents that can induce calcium carbonate precipitation, and is responsible for forming a long-lasting surface protection and self-healing layer after chemical repair.

[0033] Intelligent work units serve as execution tools, improving construction quality and efficiency through grouting equipment and its control system.

[0034] The system's basic workflow consists of two sequential steps: the first step involves an intelligent operating unit injecting chemical repair materials into the cracks to achieve immediate structural repair; after the materials have solidified, the second step involves applying a bio-self-healing agent manually or through equipment to form a biomineralized coating on the surface.

[0035] This implementation method achieves unit collaboration through process association, but it is a step-by-step construction method that emphasizes the independent functions and sequential coordination of each unit.

[0036] Example 2

[0037] This embodiment demonstrates a deeply coupled implementation method, which is a more preferred solution.

[0038] In this embodiment, the chemical repair unit and the biological self-repair unit are coupled at the material level. Specifically, the functional components of the biological self-repair unit are encapsulated in gelatin-gum arabic microcapsules and then uniformly dispersed in the grouting material of the chemical repair unit. The functional components can be Bacillus pasteurellus spores and nutrients, and the grouting material can be epoxy resin. This design allows for the simultaneous completion of structural repair and self-repair capability implantation in a single grouting operation, achieving a one-step process.

[0039] The intelligent operation unit employs a self-mixing intelligent grouting device. This device features automatic mixing of two-component grout and can automatically determine the grouting endpoint based on real-time pressure feedback. For example, it automatically shuts down when the pressure continuously exceeds a set threshold for a predetermined time. This implementation method simplifies the construction process into a single step through material integration and intelligent control, significantly improving efficiency and synergy.

[0040] Example 3

[0041] This embodiment focuses on optimizing the bio-self-healing unit to improve system performance. This embodiment uses a microbial compound agent, composed of *Bacillus pasteurellis* and *Pseudomonas alkali-tolerant*. This combination produces a synergistic effect, forming a denser and tougher calcium carbonate coating, thereby improving mineralization efficiency and durability.

[0042] By combining optimized bio-self-healing units with conventional chemical repair units and intelligent operation units, even using a phased construction approach (i.e., chemical repair followed by the application of biological agents), the final repair effect can be significantly enhanced. This implementation method highlights how independent improvements to biological units can be integrated with the overall system to extend the structural service life and demonstrates the flexibility of functional complementarity between units.

[0043] Working principle: The chemical repair unit injects a solidifying grouting material such as epoxy resin into the concrete cracks through the intelligent operation unit, which quickly fills the crack space, restores the integrity and load-bearing capacity of the structure. The self-mixing function of the intelligent operation unit ensures the uniformity of the grout, and the intelligent control logic based on real-time pressure feedback automatically determines the grouting endpoint, achieving precise and quantitative construction.

[0044] After establishing a stable structural foundation, the bio-self-healing unit utilizes microorganisms to induce calcium carbonate precipitation. Under suitable environmental conditions, microorganisms metabolize their nutrient sources to produce carbonate ions, which combine with calcium ions in the surrounding environment to form calcium carbonate crystals. These crystals gradually deposit on the surface of cracks, interfaces, and inside the chemical repair material, ultimately forming a dense and tough biomineralized film. This film not only provides excellent sealing and protection but also endows the material with self-healing potential. When new microcracks are generated due to environmental stress in the future, the exposed microorganisms can be reactivated and deposit calcium carbonate, automatically repairing the damage. The functional components of the bio-self-healing unit are encapsulated in microcapsules and pre-dispersed uniformly in the grouting material of the chemical repair unit, allowing structural reinforcement and self-healing capabilities to be "implanted" simultaneously in a single grouting application. After the chemical material solidifies, triggered by environmental conditions such as humidity, the microcapsules rupture, releasing microorganisms and initiating a long-lasting biomineralization process.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "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.

[0046] 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.

Claims

1. A microbial self-repairing based concrete crack collaborative repair system, characterized in that, include: The chemical repair unit is configured to inject a consolidating material into concrete cracks to achieve structural reinforcement. The bio-self-healing unit is configured to provide microbial-induced calcium carbonate precipitation in the area after the operation of the chemical remediation unit to form a long-lasting protective layer; The intelligent operation unit is configured to perform or assist in the construction operations of the chemical remediation unit and / or the bio-self-remediation unit; The chemical repair unit, the biological self-repair unit, and the intelligent operation unit work together through physical integration, functional coupling, or process association, and operate according to a preset repair procedure.

2. The microbial self-repairing based concrete crack synergistic repair system according to claim 1, characterized in that, The chemical remediation unit and the bio-self-remediation unit are coupled through material composites. The functional components of the bio-self-remediation unit include microorganisms and their nutrient sources, which are pre-encapsulated in microcapsules and uniformly embedded in the grouting material of the chemical remediation unit.

3. The microbial self-repairing concrete crack collaborative repair system based on microorganisms according to claim 2, characterized in that, The bio-self-repair unit contains a microbial compound agent, which is composed of Bacillus pasteurellii and at least one other microorganism with synergistic mineralization effects, wherein the other microorganism is alkali-tolerant Pseudomonas.

4. The microbial self-repairing concrete crack collaborative repair system based on microorganisms according to claim 3, characterized in that, The intelligent operation unit includes a self-mixing intelligent grouting device, which has the function of automatically mixing two-component grout, as well as the function of automatically judging the grouting endpoint and stopping the machine based on real-time pressure feedback.

5. A method for synergistic repair of concrete cracks based on microbial self-repairing, realized by the synergistic repair system for concrete cracks based on microbial self-repairing according to any one of claims 1-4, characterized in that, Includes the following steps: Step 1: Use chemical repair units to repair the internal structure of the crack; Step 2: Based on structural repair, activate the bio-self-healing unit to induce calcium carbonate deposition on the crack surface, interface and inside the material to form a biomineralized coating; Among them, intelligent work units are used to perform at least the structural repair process.

6. The method according to claim 5, wherein the method is characterized by, The structural repair and biomineralization coating processes are combined in time, and the structural repair and self-healing capabilities are implanted simultaneously in a single construction step.

7. The method according to claim 6, wherein the method is characterized by, During the structural repair process, the grouting pressure is monitored in real time by an intelligent operation unit, and the grouting endpoint is automatically determined based on the logic that the pressure continues to exceed a set threshold for a predetermined time.

8. The method according to claim 7, wherein the method is characterized by, The activation of the biological self-repair unit is automatically triggered based on environmental humidity conditions. When the humidity in the crack area meets the preset requirements, the microbial-induced calcium carbonate precipitation process is activated.

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