CN114989781A - Material and method for repairing concrete cracks by mineralization of super absorbent resin and mixed bacteria - Google Patents
Material and method for repairing concrete cracks by mineralization of super absorbent resin and mixed bacteria Download PDFInfo
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- CN114989781A CN114989781A CN202210703479.XA CN202210703479A CN114989781A CN 114989781 A CN114989781 A CN 114989781A CN 202210703479 A CN202210703479 A CN 202210703479A CN 114989781 A CN114989781 A CN 114989781A
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- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
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- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/16—Halogen-containing compounds
- C08K2003/162—Calcium, strontium or barium halides, e.g. calcium, strontium or barium chloride
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a material and a method for repairing concrete cracks by mineralization of super absorbent resin and mixed bacteria, wherein the material comprises super absorbent resin powder, microbial solution, calcium source solution and an additive; the repairing method comprises the following steps: measuring the width of a crack, and selecting super absorbent resin and microbial bacteria according to the width of the crack; injecting the super absorbent resin, the microbial liquid, the calcium source solution and the additive into the concrete cracks; step three, when the humidity in the crack is reduced to a lower degree, repeatedly injecting until the crack is completely repaired; the invention can repair fine, wider and deeper cracks, has wide application range, more compact and firmer cementation, short repair period and environmental protection.
Description
Technical Field
The invention belongs to the technical field of building materials, relates to a concrete crack repairing material and a method, and particularly relates to a material and a method for repairing a concrete crack by using microbial mineralization.
Background
With the development of the capital construction industry in China, concrete with excellent performance becomes a common building material. But the concrete is easy to form cracks such as drying shrinkage cracks, temperature cracks, load deformation cracks and the like in the forming and service processes. The generation of cracks not only provides an invasion channel for erosion factors and destroys the safety and stability of the structure, but also accelerates the aging and shortens the service life of the concrete. The traditional method for repairing cracks mainly comprises a surface sealing method, a plugging method and a structure reinforcing and strengthening method. For example: polymer intrusion, metal stapling, drill pluggers, additional rebar, etc. The repairing material is mainly used for repairing wide cracks, and conventional repairing materials cannot enter narrow cracks for filling and sealing, so that the repairing effect on the fine cracks is poor. In addition, most of the traditional repairing methods are organic materials, and the problems of poor durability and incompatibility with a concrete matrix exist.
Most of the existing patents are the research on self-repairing concrete, and the research on existing cracks is relatively less. This patent is based on the repair of existing cracks as the main direction of research. The existing passive repair patent only utilizes the mineralization of microorganisms to repair cracks, and the repair period is long because calcium carbonate precipitates can only be attached to the positions of two walls of the cracks. If the crack is slightly wider, the frequency of putting the repair bacteria liquid is increased, and the width and the depth of the repaired crack are limited. The crack self-repairing method based on urease-producing microorganism mineralization deposition (ZL201611096154.0) and the concrete crack self-repairing material based on microorganism synergistic mineralization and the application (ZL202110410836.9) are characterized in that a newly-built building is actively repaired, microorganisms are added into a concrete mixture, and moisture needs to exist during repair, so that the self-repairing method provided by the patent has certain application range limitation.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the material and the method for repairing concrete cracks by using the super absorbent resin and the mixed bacteria mineralization, which can repair fine, wider and deeper cracks, have wide application range, compact and firm cementation, short repair period and are green and environment-friendly.
In order to achieve the purpose, the invention adopts the following technical scheme:
the material for repairing concrete cracks by using super absorbent resin and mixed bacteria mineralization comprises, by mass, 10-30 parts of super absorbent resin powder, 20-50 parts of microbial liquid, 20-50 parts of calcium source solution and 1-10 parts of an additive;
the fungus in the microbial liquid comprises aerobic mixed fungus, anaerobic mixed fungus or aerobic-anaerobic binary mixed fungus with the function of inducing mineralized carbonate deposition;
OD of the aerobic mixed bacteria liquid 600 The concentration is 0.7-3, and the urease activity is 15-22 mmol/(L.min);
OD of the anaerobic mixed bacteria liquid and the aerobic-anaerobic binary mixed bacteria liquid 600 The concentration is 0.4-2;
the calcium source solution comprises a low-concentration calcium source solution with the concentration of 20mmol/L and a high-concentration calcium source solution with the concentration of 1 mol/L.
The invention also has the following technical characteristics:
preferably, the particle size of the super absorbent resin powder is 0.38-0.70 μm.
Preferably, the aerobic mixed bacteria comprise a plurality of bacillus pasteurianus, carbonic anhydrase producing bacteria, bacillus colchici, bacillus licheniformis and bacillus subtilis;
the anaerobic mixed bacteria comprise a plurality of denitrifying bacteria, bacillus stutzeri, bacillus gasseri, pseudomonas and alcaligenes;
the aerobic-anaerobic binary mixed bacteria comprise any combination of the aerobic mixed bacteria and the anaerobic mixed bacteria, and the mass ratio of aerobic mixed bacteria liquid to anaerobic mixed bacteria liquid is (1-3): (0.5-2) mixing and preparing.
Preferably, the calcium source comprises one or more of calcium acetate, calcium chloride, calcium nitrate and calcium lactate.
Preferably, the additive comprises perlite filter aid, polyacrylamide, an early strength agent or an active anionic catalyst.
The invention also provides a method for repairing concrete cracks by using the material and mineralizing the super absorbent resin and the mixed bacteria, which comprises the following steps:
measuring the width of a crack, and selecting super absorbent resin and microbial bacteria according to the width of the crack;
injecting the super absorbent resin, the microbial liquid, the calcium source solution and the additive into the concrete cracks;
and step three, repeatedly injecting until the humidity in the crack is reduced to below 50 percent until the crack is completely repaired.
Preferably, in the second step, the method for injecting the super absorbent resin, the microbial liquid, the calcium source solution and the additive into the concrete cracks comprises the following steps: firstly, spraying a high-water-absorption resin powder material into a crack by using a high-pressure spray gun, premixing microorganisms and a low-concentration calcium source solution, putting the mixture into the high-pressure spray gun to spray into the crack, and then mixing the high-concentration calcium source solution and an additive to spray into the crack.
Preferably, in the second step, the method for injecting the super absorbent resin, the microbial liquid, the calcium source solution and the additive into the concrete cracks comprises the following steps: the four materials are mixed and then sprayed into the cracks by a high-pressure spray gun.
Preferably, the mass ratio of the low-concentration calcium source solution to the high-concentration calcium source solution is 1 (0.5-2).
Compared with the prior art, the invention has the following technical effects:
the concrete crack is repaired by combining the super absorbent resin and the microbial mineralization, on one hand, the super absorbent resin can be used as a filler to fill the crack, on the other hand, the water required by the growth, metabolism and mineralization of the microbes can be provided, the problem that the traditional repairing method cannot repair the fine crack is solved, the problem that the width and the depth of the microbial mineralization repair are limited is also solved, and the repairing time of the crack is greatly shortened; the bacteria liquid is inserted into gaps of the super absorbent resin, calcium carbonate is generated by mineralization to fill the gaps, and the super absorbent resin, fillers and raw materials at the gaps are glued into a whole by calcium carbonate and colloidal substances generated by the mineralization of microorganisms; the super absorbent resin is added into the concrete, so that the tensile strength of the repaired material can be improved, the freezing resistance, the impermeability and the corrosion resistance of the material can be improved, the internal moisture can be increased, a calcium silicate hydrate is generated through hydration, and the structure is more compact and firmer;
the high water absorption resin and the mixed bacterium mineralization are combined to repair the cracks, so that the environment is protected, the repair time can be greatly shortened, the repair range of the concrete cracks is enlarged, the repair rate and the impermeability of the concrete structure are improved, the compression resistance, the crack resistance and the impermeability of the repaired concrete are improved, the service life of the concrete structure is prolonged, and the vacancy of the existing passive repair field is made up;
compared with a single-bacterium mineralization repair system, the mixed-bacterium mineralization repair system has strong environmental impact resistance, and different colonies have synergistic action, namely metabolites can be exchanged or molecular signals can be transmitted among the colonies, so that the mixed-bacterium mineralization repair system can bear more tasks, the more perfect repair characteristic of the mixed-bacterium mineralization repair system is more beneficial to realizing deep crack repair, and simultaneously the requirements of the environment where the actual concrete structure is located on microorganisms are more met.
Drawings
FIG. 1 is a flow chart of the steps of the concrete crack repair method of the present invention.
Detailed Description
The present invention will be explained in further detail with reference to examples.
Firstly, measuring the width of a crack, and selecting super absorbent resin with different particle sizes and different types of microorganisms for repairing according to different crack widths;
the additives in the following examples: the perlite filter aid, the polyacrylamide, the early strength agent or the active anion catalyst are all commercial building products.
Example 1
Less than 0.3mm for crack widthThe crack of (2) is made of a super absorbent resin having a particle size of 0.38 to 0.70 μm. The microorganism is aerobic mixed bacteria of Bacillus pasteurii and carbonic anhydrase producing bacteria, which are put into a fermentation medium containing 20g/L yeast extract and 10g/L ammonium sulfate, and the pH is adjusted to 9 by 0.1mol/L sodium hydroxide solution; sterilizing at 121 deg.C for 20min, cooling, inoculating 1%, and shake culturing at 30 deg.C for 22 hr in a shaker at 210r/min to obtain OD of bacterial liquid 600 The concentration is 2.7, and the urease activity is 20 mmol/(L.min); the calcium source is selected from a mixed solution of calcium chloride and calcium nitrate with the concentration of 1mol/L and a mixed solution of calcium chloride and calcium nitrate with the concentration of 20 mmol/L; the additive is perlite filter aid;
after the four raw materials are respectively prepared according to the mass ratio, 10 parts of super absorbent resin powder is firstly filled into a high-pressure spray gun to be sprayed into cracks, 10 parts of calcium source solution with the concentration of 20mmol/L and 20 parts of bacterial liquid are mixed and filled into the high-pressure spray gun to be sprayed into the cracks, 20 parts of calcium source solution with the concentration of 1mol/L and 1 part of perlite filter aid are filled into the high-pressure spray gun to be sprayed into the cracks, and when the humidity in the cracks is reduced to below 50 percent within 4-6 hours, the high-pressure spray gun is used for spraying mixed liquid prepared by the microbial solution, the 1mol/L calcium source solution, the super absorbent resin and the perlite filter aid according to the mass ratio of 10:20:20:1 into the cracks until the cracks are completely repaired.
Example 2
Aiming at the cracks with the crack width within the range of 0.3-0.8 mm, selecting super absorbent resin with the grain diameter of 0.38-0.70 mu m; the microorganism selects anaerobic mixed bacteria denitrifying bacilli and Sterliae, and the freeze-dried powder is activated and then placed into a culture medium containing 10g/L peptone, 3.29g/L beef extract, 5g/L sodium chloride, 1.3g/L sucrose and 0.012g/L manganese sulfate monohydrate; standing and culturing for 22h in an incubator at 30 ℃; diluting the bacterial solution to obtain OD 600 The concentration is 0.40; calcium source is calcium lactate solution with concentration of 1 mol/L; the additive is polyacrylamide;
the method comprises the following steps of taking 20 parts of super absorbent resin powder, 50 parts of microbial liquid, 40 parts of calcium source solution and 5 parts of additive in parts by mass, mixing the materials, adding the mixture into a high-pressure spray gun, spraying the mixture into a crack, and repeatedly spraying the mixture into the crack by using the high-pressure spray gun when the humidity in the crack is reduced to below 50% within 4-6 hours until the crack is completely repaired.
Example 3
Aiming at cracks with the crack width larger than 0.8mm, selecting super absorbent resin with the grain diameter of 0.38-0.70 mu m; mixing the different mixed bacteria liquid obtained in the above embodiments 1 and 2 according to the mass ratio of 1:1 to obtain aerobic-anaerobic binary mixed bacteria, diluting the bacteria liquid to obtain OD 600 The concentration is 0.40; calcium source is selected from calcium lactate and calcium nitrate solution with concentration of 1 mol/L; the admixture selects early strength agent or active anion catalyst;
the method comprises the following steps of taking 30 parts of super absorbent resin powder, 40 parts of microbial liquid, 50 parts of calcium source solution and 10 parts of additive in parts by mass, mixing the materials, adding the mixture into a high-pressure spray gun, spraying the mixture into a crack, and repeatedly spraying the mixture into the crack by using the high-pressure spray gun when the humidity in the crack is reduced to below 50% within 4-6 hours until the crack is completely repaired.
Example 4
Example 4 the same procedure as in example 1 was repeated, except that the aerobic mixed bacteria were Bacillus pasteurii, carbonic anhydrase producing bacteria and Bacillus cohnii, and the OD of the bacteria solution was 600 The concentration is 3, and the urease activity is 22 mmol/(L.min);
during operation, firstly 20 parts of calcium source solution with the concentration of 20mmol/L and 20 parts of bacterial liquid are mixed and put into a high-pressure spray gun to be sprayed into the crack, and then 10 parts of calcium source solution with the concentration of 1mol/L and 1 part of perlite filter aid are put into the high-pressure spray gun to be sprayed into the crack.
Example 5
Example 5 the same procedure as in example 1, except that the aerobic mixture is Bacillus pasteurii, carbonic anhydrase producing bacteria, Bacillus cohnii, Bacillus licheniformis and Bacillus subtilis, and the OD of the resulting mixture is 600 The concentration is 0.7, and the urease activity is 15 mmol/(L.min);
during operation, 10 parts of calcium source solution with the concentration of 20mmol/L and 20 parts of bacterial liquid are mixed and loaded into a high-pressure spray gun to be sprayed into cracks, and then 10 parts of calcium source solution with the concentration of 1mol/L and 1 part of perlite filter aid are loaded into the high-pressure spray gun to be sprayed into the cracks.
Example 6
Example 6 the same as example 2, only difference is that the anaerobic mixed bacteria is denitrifying bacillus, stewartia, firefly bacillus, Pseudomonas, OD of bacteria liquid 600 The concentration was 2.
Example 7
Example 7 the same as example 3, except that the different mixed bacteria liquids obtained in examples 4 and 6 were mixed at a mass ratio of 1:0.5 to obtain mixed aerobic-anaerobic bacteria, and the mixed bacteria liquids were diluted to obtain OD 600 The concentration was 1.0.
Example 8
Example 8 the same as example 3, except that the different mixed bacteria liquid obtained in examples 5 and 2 were mixed at a mass ratio of 3:0.5 to obtain the aerobic-anaerobic binary mixed bacteria, and the bacteria liquid was diluted to obtain OD 600 The concentration was 0.8.
Example 9
Example 9 the same as example 3, except that the different mixed bacteria liquids obtained in examples 4 and 2 were mixed at a mass ratio of 1:2 to obtain an aerobic-anaerobic mixed bacteria, and the mixed bacteria liquid was diluted to obtain OD 600 The concentration was 2.
The time for repairing the crack in the embodiment 1 is 3 to 28 days, the water permeability resistance is tested, and the permeability coefficient is 1.0 multiplied by 10 -9 ～1.0×10 -6 cm/s, and the wave speed in ultrasonic seam crossing detection is not less than 10-30% in seamless detection when the ultrasonic method is used for detection.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (9)
1. The material for repairing concrete cracks through mineralization of super absorbent resin and mixed bacteria is characterized by comprising, by mass, 10-30 parts of super absorbent resin powder, 20-50 parts of microbial liquid, 20-50 parts of calcium source solution and 1-10 parts of additive;
the fungi in the microorganism liquid comprise aerobic mixed fungi, anaerobic mixed fungi or aerobic-anaerobic binary mixed fungi with the function of inducing mineralized carbonate deposition;
OD of the aerobic mixed bacteria liquid 600 0.7 to 3, urease activity 15 to 22 mmol/(L.min);
OD of the anaerobic mixed bacteria liquid and the aerobic-anaerobic binary mixed bacteria liquid 600 The concentration is 0.4-2;
the calcium source solution comprises a low-concentration calcium source solution with the concentration of 20mmol/L and a high-concentration calcium source solution with the concentration of 1 mol/L.
2. The material for repairing concrete cracks by using the super absorbent resin and mixed bacteria mineralization as claimed in claim 1, wherein the particle size of the super absorbent resin powder is 0.38-0.70 μm.
3. The material for repairing concrete cracks by mineralization of super absorbent resin and mixed bacteria as claimed in claim 1, wherein the aerobic mixed bacteria comprise a plurality of bacillus pasteurii, carbonic anhydrase producing bacteria, bacillus koshii, bacillus licheniformis and bacillus subtilis;
the anaerobic mixed bacteria comprise a plurality of denitrifying bacteria, bacillus stutzeri, bacillus gasseri, pseudomonas and alcaligenes;
the aerobic-anaerobic binary mixed bacteria comprise any combination of the aerobic mixed bacteria and the anaerobic mixed bacteria, and the mass ratio of aerobic mixed bacteria liquid to anaerobic mixed bacteria liquid is (1-3): (0.5-2) mixing and preparing.
4. The material for repairing concrete cracks using superabsorbent resin and mixed bacterial mineralization of claim 1, wherein the calcium source comprises one or more of calcium acetate, calcium chloride, calcium nitrate, and calcium lactate.
5. The material for repairing concrete cracks by using the super absorbent resin and mixed bacteria mineralization as claimed in claim 1, wherein the additive comprises perlite filter aid, polyacrylamide, an early strength agent or an active anion catalyst.
6. A method for repairing concrete cracks by using the material as claimed in claims 1 to 5 and utilizing the super absorbent resin and mixed bacteria mineralization, which is characterized by comprising the following steps:
measuring the width of a crack, and selecting super absorbent resin and microbial bacteria according to the width of the crack;
injecting the super absorbent resin, the microbial liquid, the calcium source solution and the additive into the concrete cracks;
and step three, repeatedly injecting until the humidity in the crack is reduced to below 50 percent until the crack is completely repaired.
7. The method for repairing concrete cracks by using the super absorbent resin and mixed bacteria mineralization as claimed in claim 6, wherein in the second step, the method for injecting the super absorbent resin, the microbial liquid, the calcium source solution and the additive into the concrete cracks comprises the following steps: firstly spraying a high-water-absorption resin powder material into the crack by using a high-pressure spray gun, then premixing microorganisms and a low-concentration calcium source solution, putting the mixture into the high-pressure spray gun to spray the mixture into the crack, and then mixing the high-concentration calcium source solution and an additive to spray the mixture into the crack.
8. The method for repairing concrete cracks by using the super absorbent resin and mixed bacteria mineralization as claimed in claim 6, wherein in the second step, the method for injecting the super absorbent resin, the microbial liquid, the calcium source solution and the additive into the concrete cracks comprises the following steps: the four materials are mixed and then sprayed into the cracks by a high-pressure spray gun.
9. The method for repairing concrete cracks by using the super absorbent resin and mixed bacteria mineralization as claimed in claim 7, wherein the mass ratio of the low-concentration calcium source solution to the high-concentration calcium source solution is 1 (0.5-2).
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| CN115717045A (en) * | 2022-11-02 | 2023-02-28 | 中铁四局集团有限公司 | Concrete microcrack repairing material and preparation method thereof |
| CN115745512A (en) * | 2022-11-18 | 2023-03-07 | 河北工业大学 | 3D printing self-repairing concrete preparation method based on composite microbial inoculum |
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| CN106699026A (en) * | 2016-12-02 | 2017-05-24 | 太原理工大学 | Crack self-remediation regenerated concrete based on urease production microorganism mineralization deposition and preparation method |
| CN113121145A (en) * | 2021-04-15 | 2021-07-16 | 同济大学 | Concrete crack self-repairing material based on microbial collaborative mineralization and application |
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| WO2015007011A1 (en) * | 2013-07-18 | 2015-01-22 | 东南大学 | Preparation method of self-repairing cement-based material |
| CN106699026A (en) * | 2016-12-02 | 2017-05-24 | 太原理工大学 | Crack self-remediation regenerated concrete based on urease production microorganism mineralization deposition and preparation method |
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| CN115717045A (en) * | 2022-11-02 | 2023-02-28 | 中铁四局集团有限公司 | Concrete microcrack repairing material and preparation method thereof |
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| CN115745512A (en) * | 2022-11-18 | 2023-03-07 | 河北工业大学 | 3D printing self-repairing concrete preparation method based on composite microbial inoculum |
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