Concrete crack repairing material as well as preparation method and application thereof
By using soy urease solution and calcium gluconate cementitious solution, combined with sodium alginate as a glycogen stabilizer, the unstable urease activity and environmental safety problems in MICP technology were solved, and efficient and environmentally friendly concrete crack repair effect was achieved.
Patent Information
- Application Number
- CN202411973635.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-03-28
AI Technical Summary
The urease activity in the existing MICP technology is unstable, and the high-yield urease bacteria are pathogenic and have high cost, and the impact on environmental safety is uncertain.
Soy urease solution is used as repair solution A, calcium carbonate deposition is induced by plant-source urease, and cementitious solution prepared by calcium gluconate as calcium source is used as repair solution B, and sodium alginate solution is added as glycogen stabilizer.
It improves the convenience of urease extraction, avoids secondary environmental pollution, enhances the reinforcement and leakage plugging effect of repair materials, improves the repair efficiency, and is easy to obtain materials, which has good economical and environmental friendly.
Smart Images
Figure CN119707436A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of concrete crack repair, and in particular relates to a concrete crack repair material and a preparation method and application thereof. Background Art
[0002] As one of the most widely used and consumed building materials today, the service life and durability of concrete have always been valued by the industry. However, concrete cracking is one of the most widespread and harmful durability problems. In complex application scenarios and service environments, the generation of tiny cracks in concrete structures is inevitable. Concrete cracking will not only lead to leakage, but also hydrolysis and destruction of the internal structure of concrete, resulting in a reduction in bearing capacity. It will also cause the internal steel bars of the concrete to be exposed to a corrosive environment, resulting in rust and destroying the integrity of the structure. Microcracks are usually harmless cracks that do not harm the load-bearing, anti-seepage and other functions of concrete. However, after the concrete is subjected to loads, temperature differences, etc., the microcracks will continue to expand and connect, eventually forming macro cracks visible to the naked eye.
[0003] At present, microbial induced carbonate precipitation (MICP) technology is an emerging crack or soil reinforcement technology used to reinforce sand and rock to improve the mechanical properties of rock and soil. However, the urease produced by bacterial metabolism in MICP technology is easily affected by external environmental factors such as temperature and pH, and the urease activity is very unstable. At the same time, the high-yield urease bacteria used in MICP technology have certain pathogenicity and high cost, and the impact on environmental safety is uncertain. Summary of the invention
[0004] In view of the technical problems existing in the prior art, the present invention provides a concrete crack repair material and a preparation method and application thereof, so as to solve the technical problems in MICP technology that the urease activity is unstable, the high-yield urease bacteria used have certain pathogenicity and high cost, and the impact on environmental safety is uncertain.
[0005] In order to achieve the above object, the technical solution adopted by the present invention is: The invention provides a concrete crack repair material, comprising a repair liquid A, a repair liquid B and a glycogen stabilizer; wherein the repair liquid A is a soybean urease solution; the repair liquid B is a cementing liquid prepared by using calcium gluconate as a calcium source; and the glycogen stabilizer is a sodium alginate solution.
[0006] Furthermore, the volume ratio of the repair liquid A to the repair liquid B is 1:(0.75-1.5), and the volume of the sodium alginate solution is 0.5%-2.0% of the total volume of the repair liquid A and the repair liquid B; The concentration of the repair solution A is 20-200 g / L; The repair solution B is prepared by using a calcium gluconate solution and a urea solution in a volume ratio of (0.5-1.0): (0.6-1.2); wherein the concentration of the calcium gluconate solution is 1.0 mol / L, and the concentration of the urea solution is 1.2 mol / L; The concentration of the sodium alginate solution is 5-20 g / L.
[0007] Furthermore, the volume ratio of the repair liquid A to the repair liquid B is 1:1, and the volume of the sodium alginate solution is 0.5% of the total volume of the repair liquid A and the repair liquid B; The concentration of the repair liquid A is 80g / L; The repair solution B is prepared by using a calcium gluconate solution and a urea solution in a volume ratio of 1.0:1.2; wherein the concentration of the calcium gluconate solution is 1.0 mol / L, and the concentration of the urea solution is 1.2 mol / L; The concentration of the sodium alginate solution is 5 g / L.
[0008] The present invention also provides a method for preparing a concrete crack repair material, comprising: The dried soybeans are crushed and mixed with water to obtain a soybean powder solution; the soybean powder solution is centrifuged to obtain a soybean urease solution; Mixing calcium gluconate and urea to obtain a cementing liquid; mixing sodium alginate with water to obtain a sodium alginate solution; The soybean urease solution is used as the repair liquid A, the cementing liquid is used as the repair liquid B, and the sodium alginate solution is used as the glycogen stabilizer.
[0009] Further, the dried soybeans are crushed and mixed with water to obtain a soybean powder solution; and the soybean powder solution is centrifuged to obtain a soybean urease solution, as follows: The soybeans are placed in an oven and roasted to obtain dried soybeans; The dried soybeans are crushed and sieved to obtain soybean powder; The soybean powder is mixed with deionized water to obtain a soybean powder solution; the soybean powder solution is centrifuged, and the soybean dregs are removed by filtering to obtain a soybean urease solution.
[0010] Furthermore, the preparation process of the cementing fluid is as follows: The cementing liquid is obtained by mixing a calcium gluconate solution with a urea solution.
[0011] The present invention also provides an application of a concrete crack repair material, and the concrete cracks are repaired by using the concrete repair material.
[0012] Further, the process of using the concrete repair material to repair concrete cracks is as follows: The repair liquid A, the repair liquid B and the glycogen stabilizer are sequentially and cyclically injected into the concrete cracks to be repaired by injection until precipitates are generated in the concrete cracks to be repaired and cannot be injected.
[0013] Furthermore, in the process of cyclically injecting the repair liquid A, the repair liquid B and the glycogen stabilizer into the concrete crack to be repaired in sequence, the cyclic injection is performed 6-12 times within 72 hours.
[0014] Further, the process of using the concrete repair material to repair concrete cracks is as follows: The repair agent is obtained by mixing the repair liquid A, the repair liquid B and the glycogen stabilizer by the perfusion method; then the repair agent is perfused into the concrete crack to be repaired; wherein, before the process of perfuming the repair agent into the concrete crack to be repaired, the surface of the concrete crack to be repaired is cleaned and sealed; wherein, during the sealing process, an injection port is reserved for the injection channel of the repair agent.
[0015] Compared with the prior art, the present invention has the following beneficial effects: The concrete crack repair material provided by the present invention, as well as its preparation method and application, adopts soybean urease solution as repair liquid A, does not need to use the cultivation of microbial urease, and ensures the convenience of urease extraction; inducing calcium carbonate deposition through plant-derived urease to repair concrete cracks, avoids the problem of secondary environmental pollution, and belongs to an environmentally friendly repair method; through the fixation effect of sodium alginate on calcium ions, the reinforcement and plugging effect of the repair material is improved; specifically, by adding sodium alginate solution as a glycogen stabilizer, free calcium ions are fixed, calcium ions are promoted to combine with anions to generate calcium precipitates, and the internal molecular arrangement of the calcium precipitates is made more compact and stable, while increasing the nucleation sites for urease to repair concrete, sodium alginate is avoided from occupying the nucleation sites, thereby greatly improving the repair efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0017] Figure 1 This is a schematic diagram of the preparation process of the concrete crack repair material described in Example 1; Figure 2 A comparison chart of concrete cracks before and after repair using the concrete crack repair material prepared in Example 1; Figure 3 The XRD diagram of concrete cracks repaired by the concrete crack repair material prepared in Example 1; Figure 4 This is a SEM image of the product at the crack after the concrete crack was repaired using the concrete crack repair material prepared in Example 1. DETAILED DESCRIPTION
[0018] In order to make the technical problems, technical solutions and beneficial effects solved by this application clearer, the technical solutions in the embodiments of this application will be described clearly and completely in combination with the drawings in the embodiments of this application; obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0019] The invention provides a concrete crack repair material, comprising a repair liquid A, a repair liquid B and a glycogen stabilizer; the repair liquid A is a soybean urease solution, the repair liquid B is a cementing liquid prepared by using calcium gluconate as a calcium source; and the glycogen stabilizer is a sodium alginate solution.
[0020] In the present invention, sodium alginate solution is added as a glycogen stabilizer to fix free calcium ions, promote the combination of calcium ions and anions to generate calcium precipitates, and make the internal molecular arrangement of the calcium precipitate more compact and stable. While increasing the nucleation sites for urease to repair concrete, sodium alginate is prevented from occupying the nucleation sites, thereby greatly improving the repair efficiency.
[0021] Example 1 This embodiment 1 provides a concrete crack repair material, including a repair liquid A, a repair liquid B and a glycogen stabilizer; wherein the repair liquid A is a soybean urease solution; the repair liquid B is a binder prepared using calcium gluconate as a calcium source; and the glycogen stabilizer is a sodium alginate solution.
[0022] The volume ratio of the repair liquid A to the repair liquid B is 1:1, and the volume of the sodium alginate solution is 0.5% of the total volume of the repair liquid A and the repair liquid B.
[0023] The concentration of the repair liquid A is 80g / L; the repair liquid B is prepared by using calcium gluconate solution and urea solution in a volume ratio of 1.0:1.2; wherein the concentration of the calcium gluconate solution is 1.0mol / L, and the concentration of the urea solution is 1.2mol / L; the concentration of the glycogen stabilizer is 5g / L.
[0024] As attached Figure 1 As shown, the preparation method of the concrete crack repair material described in this embodiment 1 includes the following steps: Step 1, crushing the dried soybeans and mixing them with water to obtain a soybean powder solution; centrifuging the soybean powder solution to obtain a soybean urease solution; specifically, placing the soybeans in an oven and baking them at 40° C. for 6 hours to obtain dried soybeans; crushing and sieving the dried soybeans to obtain soybean powder; mixing the soybean powder with deionized water to obtain a soybean powder solution; centrifuging the soybean powder solution at 8000 r / min for 6 minutes, filtering to remove the dregs, and obtaining a soybean urease solution.
[0025] Step 2: Mix the calcium gluconate solution and the urea solution in a volume ratio of 1.0:1.2 to obtain a cementing solution; wherein the concentration of the calcium gluconate solution is 1.0 mol / L, and the concentration of the urea solution is 1.2 mol / L.
[0026] Step 3: Mix sodium alginate and water to obtain a sodium alginate solution; wherein the concentration of the sodium alginate solution is 5 g / L.
[0027] Step 4: Use the soybean urease solution as repair liquid A, the binder solution as repair liquid B, and the sodium alginate solution as a glycogen stabilizer to obtain the concrete crack repair material.
[0028] Taking the repair of preset cracks in a concrete test block as an example, the application process of the concrete crack repair material described in this embodiment 1 is described as follows: The concrete crack repair material is used to repair cracks by injection method, and the process includes: Place the jointed concrete test block into the compartment of the curing box, and use a disposable medical sterile syringe to circulate and inject the repair liquid A, the repair liquid B and the glycogen stabilizer into the concrete crack to be repaired in sequence until precipitates are generated in the concrete crack to be repaired and cannot be injected; wherein, in the process of circulatory injecting the repair liquid A, the repair liquid B and the glycogen stabilizer into the concrete crack to be repaired in sequence, the cyclic injection is adopted for 6-12 times within 72 hours, until precipitates are generated in the concrete crack to be repaired and cannot be injected.
[0029] This embodiment 1 also provides a method for implementing crack repair using a perfusion method, which is as follows: Concrete cracks to be repaired on the jointed concrete test block are identified, and the surface of the concrete cracks to be repaired is cleaned and sealed; wherein, during the sealing treatment, an injection port is reserved for an injection channel for the repair agent; then, the repair liquid A, the repair liquid B and the glycogen stabilizer are mixed to obtain a repair agent; thereafter, the repair agent is poured into the concrete cracks to be repaired.
[0030] The concrete crack repair material described in Example 1 uses soybean urease solution as repair liquid A, selects calcium gluconate as a calcium source to prepare a binder as repair liquid B, and adds sodium alginate solution as a glycogen stabilizer. The glycogen stabilizer can fix free calcium ions, promote the combination of calcium ions and anions to form calcium precipitates, and make the internal molecular arrangement of the calcium precipitate more compact and stable. While increasing the nucleation sites for concrete repair by urease, it avoids the occupation of the nucleation sites by sodium alginate, facilitates the generation of calcium carbonate and enhances the internal connection of the structure, thereby promoting the repair of concrete cracks. During the repair construction process, it can not only play a role in repairing concrete cracks, but also be easy to make on site, easy to use and can complete the repair task, thereby achieving the purpose of low carbon, environmental protection, and economic benefits.
[0031] As attached Figure 2 As shown, attached Figure 2 A comparison chart of concrete crack repair material prepared in Example 1 before and after concrete crack repair is given in FIG. Figure 2 The left side of the figure is a diagram before the concrete crack is repaired. Figure 2 The right side of the figure is a diagram of the concrete crack after repair; Figure 2 It can be seen that after the concrete cracks are repaired with the concrete crack repair material described in Example 1, the precipitates at the cracks of the concrete test block are evenly and tightly attached to the surface or cracks of the test block; the principle is: the white calcium carbonate precipitate is generated by the mineralization reaction of urease to seal the cracks, thereby reducing the porosity of the concrete specimen, and the sealing effect is obvious.
[0032] As attached Figure 3 As shown, attached Figure 3 The XRD graph of the concrete crack repair material prepared in Example 1 after the concrete cracks were repaired is given in the figure; Figure 3It can be seen that after the concrete cracks are repaired with the concrete crack repair material described in Example 1, the strong peak 2θ values of the mineralized products generated are mainly 24.92° and 29.36°; after comparing the above strong peak 2θ values with the standard spectrum, it can be found that they correspond to the (104) crystal plane of calcite, among which vaterite is mainly generated at 24.92°, corresponding to the (110) crystal plane of vaterite; secondly, the peak shape of each diffraction peak is sharp, indicating that the crystallization performance of the sample is good; thus, it can be obtained that the precipitate of the specimen is calcite-type calcium carbonate and vaterite-type calcium carbonate, which is consistent with the SEM and EDS analysis results.
[0033] As attached Figure 4 As shown, attached Figure 4 The SEM image of the product at the crack after the concrete crack was repaired by the concrete crack repair material prepared in Example 1 is given in the figure; wherein, Figure 4 The scale of the diagram increases from left to right; Figure 4 It can be seen that the crystal form of calcium carbonate precipitation is determined by SEM scanning. After the concrete crack repair material described in Example 1 repairs the concrete cracks, the main type of calcium carbonate crystals generated at the cracks of the repaired test block is vaterite, and the crystal morphology is uniformly spherical, with a smooth surface and tight bridging.
[0034] Example 2 This embodiment 2 provides a concrete crack repair material, including a repair liquid A, a repair liquid B and a glycogen stabilizer; wherein the repair liquid A is a soybean urease solution; the repair liquid B is a binder prepared using calcium gluconate as a calcium source; and the glycogen stabilizer is a sodium alginate solution.
[0035] The volume ratio of the repair liquid A to the repair liquid B is 1.0:0.75, and the volume of the sodium alginate solution is 1.0% of the total volume of the repair liquid A and the repair liquid B.
[0036] The concentration of the repair liquid A is 20g / L.
[0037] The repair liquid B is prepared by mixing calcium gluconate solution and urea solution in a volume ratio of 0.5:0.6; wherein the concentration of the calcium gluconate solution is 1.0 mol / L, and the concentration of the urea solution is 1.2 mol / L.
[0038] The concentration of the sodium alginate solution is 10 g / L.
[0039] It should be noted that the preparation and application process of the concrete crack repair material provided in this embodiment 2 is basically similar to the preparation and application process of the concrete crack repair material described in the above embodiment 1, and will not be repeated here.
[0040] Example 3 This embodiment 3 provides a concrete crack repair material, including a repair liquid A, a repair liquid B and a glycogen stabilizer; wherein the repair liquid A is a soybean urease solution; the repair liquid B is a binder prepared using calcium gluconate as a calcium source; and the glycogen stabilizer is a sodium alginate solution.
[0041] The volume ratio of the repair liquid A to the repair liquid B is 1.0:1.25, and the volume of the sodium alginate solution is 1.5% of the total volume of the repair liquid A and the repair liquid B.
[0042] The concentration of the repair liquid A is 200g / L.
[0043] The repair liquid B is prepared by using calcium gluconate solution and urea solution in a volume ratio of 0.8:1.0; wherein the concentration of the calcium gluconate solution is 1.0 mol / L, and the concentration of the urea solution is 1.2 mol / L.
[0044] The concentration of the sodium alginate solution is 15 g / L.
[0045] It should be noted that the preparation and application process of the concrete crack repair material provided in this embodiment 3 is basically similar to the preparation and application process of the concrete crack repair material described in the above embodiment 1, and will not be repeated here.
[0046] Example 4 This embodiment 4 provides a concrete crack repair material, including repair liquid A, repair liquid B and a glycogen stabilizer; wherein the repair liquid A is a soybean urease solution; the repair liquid B is a binder prepared using calcium gluconate as a calcium source; and the glycogen stabilizer is a sodium alginate solution.
[0047] The volume ratio of the repair liquid A to the repair liquid B is 1.0:1.5, and the volume of the sodium alginate solution is 2.0% of the total volume of the repair liquid A and the repair liquid B.
[0048] The concentration of the repair liquid A is 150g / L.
[0049] The repair liquid B is prepared by mixing calcium gluconate solution and urea solution in a volume ratio of 0.7:0.8; wherein the concentration of the calcium gluconate solution is 1.0 mol / L, and the concentration of the urea solution is 1.2 mol / L.
[0050] The concentration of the sodium alginate solution is 20 g / L.
[0051] It should be noted that the preparation and application process of the concrete crack repair material provided in this embodiment 4 is basically similar to the preparation and application process of the concrete crack repair material described in the above embodiment 1, and will not be repeated here.
[0052] The concrete crack repair material of the present invention avoids the step of cultivating microbial urease by extracting plant urease; because the cultivation of microorganisms requires not only the activation of the primary bacteria, but also the cultivation of the second or even third generation of bacteria to achieve a more ideal state, the convenience of urease extraction is ensured by extracting the plant urease; secondly, by adding a sodium alginate solution and using the sodium alginate solution as a glycogen stabilizer and utilizing the immobilization effect of sodium alginate on calcium ions, it is avoided that the free urease cannot be combined with the interior of the concrete, resulting in a reduction in the repair efficiency, and the nucleation sites for concrete repair by the urease are increased without occupying them, thereby greatly improving the repair efficiency.
[0053] In the present invention, plant-derived urease is used to induce calcium carbonate deposition to repair concrete cracks, thereby avoiding the problem of secondary environmental pollution caused by other materials, and the invention belongs to an environmentally friendly repair method; by adjusting the urease concentration and the ratio of different binders, the crack healing can be quickly promoted, the material is easy to obtain, and the invention has good practicality; it should be noted that the repair liquid B is a binder prepared by selecting other calcium-containing solutions as the calcium source; preferably, the other calcium source solutions include calcium chloride, wood calcium or calcium acetate; the materials required by the present invention can all be produced on site, thereby reducing the cost of material use, and the invention has the advantages of good economy, environmental friendliness and simple operation.
[0054] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention.
Claims
1. A concrete crack repair material, characterized in that: It comprises a repair liquid A, a repair liquid B and a glycogen stabilizer; wherein the repair liquid A is a soybean urease solution; the repair liquid B is a cementing liquid prepared by using calcium gluconate as a calcium source; and the glycogen stabilizer is a sodium alginate solution.
2. A concrete crack repair material according to claim 1, characterized in that: The volume ratio of the repair liquid A to the repair liquid B is 1:(0.75-1.5), and the volume of the sodium alginate solution is 0.5%-2.0% of the total volume of the repair liquid A and the repair liquid B; The concentration of the repair solution A is 20-200 g / L; The repair solution B is prepared by using a calcium gluconate solution and a urea solution in a volume ratio of (0.5-1.0): (0.6-1.2); wherein the concentration of the calcium gluconate solution is 1.0 mol / L, and the concentration of the urea solution is 1.2 mol / L; The concentration of the sodium alginate solution is 5-20 g / L.
3. A concrete crack repair material according to claim 1, characterized in that: The volume ratio of the repair liquid A to the repair liquid B is 1:1, and the volume of the sodium alginate solution is 0.5% of the total volume of the repair liquid A and the repair liquid B; The concentration of the repair liquid A is 80g / L; The repair solution B is prepared by using a calcium gluconate solution and a urea solution in a volume ratio of 1.0:1.2; wherein the concentration of the calcium gluconate solution is 1.0 mol / L, and the concentration of the urea solution is 1.2 mol / L; The concentration of the sodium alginate solution is 5 g / L.
4. A method for preparing a concrete crack repair material according to any one of claims 1 to 3, characterized in that: include: The dried soybeans are crushed and mixed with water to obtain a soybean powder solution; Centrifuging the soybean powder solution to obtain a soybean urease solution; Mixing calcium gluconate and urea to obtain a cementing liquid; mixing sodium alginate with water to obtain a sodium alginate solution; The soybean urease solution is used as the repair liquid A, the cementing liquid is used as the repair liquid B, and the sodium alginate solution is used as the glycogen stabilizer.
5. The method for preparing a concrete crack repair material according to claim 4, characterized in that: The process of crushing dried soybeans and mixing with water to obtain a soybean powder solution; and centrifuging the soybean powder solution to obtain a soybean urease solution is as follows: The soybeans are placed in an oven and roasted to obtain dried soybeans; The dried soybeans are crushed and sieved to obtain soybean powder; The soybean powder is mixed with deionized water to obtain a soybean powder solution; the soybean powder solution is centrifuged, and the soybean dregs are removed by filtering to obtain a soybean urease solution.
6. The method for preparing a concrete crack repair material according to claim 4, characterized in that: The preparation process of the cementing fluid is as follows: The cementing liquid is obtained by mixing a calcium gluconate solution with a urea solution.
7. The use of a concrete crack repair material according to any one of claims 1 to 3, characterized in that: The concrete repair material is used to repair concrete cracks.
8. The use of a concrete crack repair material according to claim 7, characterized in that: The process of repairing concrete cracks using the concrete repair material is as follows: The repair liquid A, the repair liquid B and the glycogen stabilizer are sequentially and cyclically injected into the concrete cracks to be repaired by injection until precipitates are generated in the concrete cracks to be repaired and cannot be injected.
9. The use of a concrete crack repair material according to claim 8, characterized in that: In the process of sequentially cyclically injecting the repair liquid A, the repair liquid B and the glycogen stabilizer into the concrete cracks to be repaired, the cyclic injection is performed 6-12 times within 72 hours.
10. The use of a concrete crack repair material according to claim 7, characterized in that: The process of repairing concrete cracks using the concrete repair material is as follows: The repair agent is obtained by mixing the repair liquid A, the repair liquid B and the glycogen stabilizer by the perfusion method; then the repair agent is perfused into the concrete crack to be repaired; wherein, before the process of perfuming the repair agent into the concrete crack to be repaired, the surface of the concrete crack to be repaired is cleaned and sealed; wherein, during the sealing process, an injection port is reserved for the injection channel of the repair agent.