CN113913469A - Blast furnace crack repairing method based on microbial agent - Google Patents
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P3/00—Preparation of elements or inorganic compounds except carbon dioxide
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5007—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with salts or salty compositions, e.g. for salt glazing
- C04B41/501—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with salts or salty compositions, e.g. for salt glazing containing carbon in the anion, e.g. carbonates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/65—Coating or impregnation with inorganic materials
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/20—Bacteria; Culture media therefor
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
- E04G23/0211—Arrangements for filling cracks or cavities in building constructions using injection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
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Abstract
The invention provides a blast furnace crack repairing method based on a microbial agent, relates to the technical field of microorganism application, and aims to improve the crack repairing efficiency of the microbial agent in a blast furnace concrete environment with high aggregate content and steel fiber by applying a mixed microbial agent of bacillus licheniformis and bacillus megaterium to the blast furnace crack repairing.
Description
Technical Field
The invention relates to the technical field of microorganism application, in particular to a blast furnace crack repairing method based on a microorganism bacterium agent.
Background
The blast furnace shell takes mass concrete as a blast furnace structure, and the service life of the blast furnace influences the production efficiency and the service life of the blast furnace. However, the blast furnace, especially the blast furnace part with a complex structure such as the top of a boiler, is easy to generate micro cracks due to temperature shrinkage stress or the quality of raw materials in construction or the execution deviation of construction standard, and if the micro cracks continue to develop into macro cracks, the heat dissipation loss of the blast furnace is increased, the strength and the durability of the blast furnace are adversely affected, and even the service life of the blast furnace is greatly shortened.
The traditional method for blocking the blast furnace cracks comprises chemical grouting, caulking blocking, surface course repairing, structural reinforcement and the like. Recently, the caulking sealing method combining chemical grouting and caulking processes is adopted to repair and seal the cracks of the blast furnace, so that a good effect is achieved. The caulking method comprises the steps of completing the cutting of a construction groove along a crack, pressing grouting materials into the crack for filling and sealing, bonding the grouting materials to a concrete matrix into a whole after the grouting materials are hardened, and plugging and reinforcing the crack to a certain extent. But has the defects of long repairing time, difficult regulation and control of the repairing process and new microcracks generated after the grouting material is dried and shrunk.
In the prior art, the invention discloses crack self-repairing recycled concrete based on urease-producing microorganism mineralization deposition and a preparation method thereof. The method takes urease-producing microorganisms as a concrete crack repairing agent, produces urease through the metabolism of the urease-producing microorganisms, and decomposes urea into NH4 +And CO3 2+And then mineralize and deposit calcium carbonate to repair the cracks. Although a certain concrete crack repairing effect is realized, the concrete crack repairing method has the following disadvantages:
1) the foundation and the shell of the blast furnace are made of heat-resistant concrete, the heat-resistant concrete contains aggregate with a higher proportion than that of common concrete, the existing concrete crack repairing agent based on urease-producing microorganism mineralization deposition and the original cement stone base have a region with weak bonding, a large number of micro cracks exist in the cracks, so that the mechanical property of the cracks is reduced, and the strength and the durability are poor; 2) steel fiber heat-resistant concrete is adopted in some blast furnaces, the existing concrete crack repairing agent based on urease-producing microorganism mineralization and deposition contains calcium chloride and urea and has the problem of overhigh pH value, and a repairing system taking urea as a reaction substrate can generate a large amount of ammonia in the mineralization process to increase the risk of corrosion of concrete reinforcing steel bars; the calcium chloride corrodes steel fibers and accelerates the steel bars in the concrete to be corroded, so that new cracks are generated to influence the durability of the concrete layer; 3) the self-repairing function of the existing concrete crack repairing agent is outstanding, but the instantaneity and the strength of crack repairing are general; the temperature of the blast furnace shell is higher in the application process, so that the self-repairing function of the concrete crack repairing agent based on urease-producing microorganism mineralization deposition is basically lost; the overall crack repair effect is not ideal.
Therefore, a microbial agent suitable for a blast furnace crack repairing scene is needed.
Disclosure of Invention
In view of the above problems, the present invention provides a method for repairing a blast furnace crack by using a microbial agent, which has a better repairing effect and higher durability for repairing a blast furnace crack.
In order to achieve the purpose, a method for repairing a blast furnace crack based on a microbial agent is characterized in that the microbial agent consisting of bacillus megatherium bacteria liquid and bacillus licheniformis liquid is mixed with glycerol to prepare mixed liquid A; the mixed solution A and the cementing solution are used as microbial grouting materials;
injecting the microbial grouting material into the blast furnace cracks in N rounds by using injection equipment; wherein N is more than or equal to 5.
Further, preferably, the cementing liquid is a mixed liquid B prepared by 1.1mol \ L-1.5 mol \ L of calcium acetate and 1.1mol \ L-1.5 mol \ L of calcium lactate according to a molar ratio of 1: 1.
Further, preferably, the step of injecting the microbial grouting material into the blast furnace cracks by using an injection device comprises:
and injecting the mixed solution A, the mixed solution B and air into the blast furnace cracks in sequence by using injection equipment.
Further, preferably, bacillus megaterium is inoculated into an LB medium solution, urea is added to the medium solution to a concentration of 20g/L, and the medium solution is cultured at 30 ℃ and pH 8 until OD600 becomes 1.2, to prepare a bacillus megaterium solution;
inoculating bacillus licheniformis into a culture medium solution, adding urea into the culture medium solution to a concentration of 17-21 g/L, and adding Ni (NO)3)2Until the concentration is 8-12 g/L; culturing at 40 deg.C and pH of 8.5 until OD600 is 1.2 to obtain Bacillus licheniformis liquid.
Further, preferably, the culture medium solution of the bacillus licheniformis comprises 25g/L of glucose, 12.5g/L of peptone, 5g/L of beef extract and 6.5g/L, KH of yeast extract2PO42g/L, NaCl 1g/L and H 20 1L。
According to the method for repairing the blast furnace cracks based on the microbial agent, on the premise that the blast furnace cracks are repaired without using a traditional grouting material, the microbial agent and a cementing liquid are injected into the crack cavity, calcium carbonate crystals are generated in the cracks through induction by taking microbial cells as a core, and as grouting progresses, calcium carbonate crystal particles gradually increase and are stacked together, so that calcium carbonate blocks with certain strength and induced by pure microbes are formed, and then the repairing operation of the blast furnace cracks is completed; has the following beneficial effects:
in the high-temperature and high-alkali scene of blast furnace crack repair, a bacillus megaterium microbial inoculum and a bacillus licheniformis microbial inoculum are adopted as aerobic mixed bacteria liquid, so that the urease activity and the inorganic conversion rate are higher;
the microbial agent, the cementing liquid and the glycerol are used as the crack repairing liquid for repairing the blast furnace crack, so that the compatibility of the microbial agent and a raw cement stone matrix is improved, and the crack healing rate and the compressive strength recovery rate of the blast furnace are improved;
the crystal structure of microbial induced carbonate deposition (MICP) generated in situ by using a mixture of bacillus megaterium and bacillus licheniformis agents is diverse, including both calcite and vaterite, and aragonite; calcium carbonate in different forms has better compatibility with the concrete matrix with high bone content, reduces the occurrence probability of uneven strength distribution, and further improves the technical effect of durability after repair;
glycerol is added as a protective agent to keep the stable enzyme activity of urease; the surface tension of water is changed by adding glycerol, the hydrophobic effect in urease molecules is enhanced, and the hydroxyl of the glycerol and the amido of the enzyme interact in a hydrogen bond mode, so that the thermal stability of the urease is promoted; the mixture of calcium acetate and calcium lactate is used as the cementing liquid, so that microorganisms are protected from the influence of the blast furnace environment to a certain extent; the corrosion to the wire netting in the blast furnace in the repairing process is avoided, the repairing effect of the blast furnace cracks is further ensured, and the service life of the blast furnace is further prolonged.
Drawings
FIG. 1 is a graph showing the results of testing urease activities of different agents in an embodiment of a microbial agent-based blast furnace crack repair method of the present invention;
FIG. 2 is a graph showing test results of the specimen crack repair rate under different treatments in an example of the microbial agent-based blast furnace crack repair method of the present invention;
FIG. 3 is a graph showing the results of testing uniaxial compressive strength of test pieces under different treatments in an example of the microbial inoculant-based blast furnace crack repair method of the present invention;
FIG. 4 is a graph showing the results of the crack healing rate test of the test piece treated by different filling methods in the embodiment of the method for repairing the crack of the blast furnace based on the microbial agent;
FIG. 5 is a graph showing the results of porosity tests of test pieces treated in different filling manners in an embodiment of the method for repairing a blast furnace crack based on a microbial agent according to the present invention.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The examples do not show specific techniques or conditions, and the reagents or apparatuses used are not shown in the specifications of the products, and the conventional products are available from normal distributors.
The strains used in the present invention are Bacillus licheniformis (Bacil-lus licheniformis) and Bacillus megaterium (Baellusmegatherium); the cell surface of the bacillus licheniformis and the extracellular polysaccharide EPS can provide nucleation sites for mineral precipitation, the extracellular polymer EPS contains a large amount of tyrosine and glycine, and the two amino acids can attract and combine a large amount of cations under alkaline conditions to provide a local saturated microenvironment for mineral formation; the method is more suitable for the scene of repairing the blast furnace crack with high aggregate content. Bacillus megaterium (Baellusmegatherium) is a bacillus spore-forming, gram-positive and aerobic bacterium, can grow and propagate at the temperature of 3-45 ℃, and has strong resistance to extreme environments. Among them, Bacillus licheniformis (Bacillus-lus licheniformis) and Bacillus megaterium (Baellusmegatherium) are commercially available.
Example 1
Inoculating bacillus megaterium to an LB (lysogeny broth) culture medium solution, adding urea into the culture medium solution until the concentration is 20g/L, and culturing at the temperature of 30 ℃ and the pH value of 8 until the OD600 is 1.2 to prepare a bacillus megaterium bacterial solution;
inoculating Bacillus licheniformis to Bacillus licheniformis culture medium solution, wherein the Bacillus licheniformis culture medium solution comprises glucose 25g/L, peptone 12.5g/L, beef extract 5g/L, and yeast extract 6.5g/L, KH2PO42g/L, NaCl 1g/L and H201L of the medium. Adding urea to the culture medium solution to a concentration of 17g/L, and adding Ni (NO)3)2To a concentration of 8 g/L; culturing at 40 deg.C and pH of 8.5 until OD600 is 1.2 to obtain Bacillus licheniformis liquid;
preparing a first microbial agent by using bacillus megaterium liquid and bacillus licheniformis liquid according to the volume ratio of 4: 1;
the mixed solution of 1.1mol \ L calcium acetate and 1.1mol \ L calcium lactate according to the volume ratio of 1:1 is used as the first cementing solution.
Example 2
Inoculating bacillus megaterium to an LB (lysogeny broth) culture medium solution, adding urea into the culture medium solution until the concentration is 20g/L, and culturing at the temperature of 30 ℃ and the pH value of 8 until the OD600 is 1.2 to prepare a bacillus megaterium bacterial solution;
inoculating Bacillus licheniformis to Bacillus licheniformis culture medium solution, wherein the Bacillus licheniformis culture medium solution comprises glucose 25g/L, peptone 12.5g/L, beef extract 5g/L, and yeast extract 6.5g/L, KH2PO42g/L, NaCl 1g/L and H201L of the medium. Adding urea to the culture medium solution to a concentration of 21g/L, and adding Ni (NO)3)2To a concentration of 12 g/L; culturing at 40 deg.C and pH of 8.5 until OD600 is 1.2 to obtain Bacillus licheniformis liquid.
Preparing a bacillus megaterium bacterial solution and a bacillus licheniformis bacterial solution according to the volume ratio of 9:1 to form a microbial agent II;
and a mixed solution of 1.5mol \ L calcium acetate and 1.5mol \ L calcium lactate according to the volume ratio of 1:1 is used as a second cementing solution.
Example 3
Inoculating bacillus megaterium to an LB (lysogeny broth) culture medium solution, adding urea into the culture medium solution until the concentration is 20g/L, and culturing at the temperature of 30 ℃ and the pH value of 8 until the OD600 is 1.2 to prepare a bacillus megaterium bacterial solution;
inoculating Bacillus licheniformis to Bacillus licheniformis culture medium solution, wherein the Bacillus licheniformis culture medium solution comprises glucose 25g/L, peptone 12.5g/L, beef extract 5g/L, and yeast extract 6.5g/L, KH2PO42g/L, NaCl 1g/L and H201L of the medium. Adding urea to the culture medium solutionAdding Ni (NO) at a concentration of 19g/L3)2To a concentration of 11 g/L; culturing at 40 deg.C and pH of 8.5 until OD600 is 1.2 to obtain Bacillus licheniformis liquid.
Preparing a third microbial agent from a bacillus megaterium bacterial solution and a bacillus licheniformis bacterial solution according to the volume ratio of 6: 1;
and a mixed solution of 1.2mol \ L calcium acetate and 1.2mol \ L calcium lactate according to the volume ratio of 1:1 is used as a third cementing solution.
Comparative example
Inoculating bacillus megaterium to an LB (lysogeny broth) culture medium solution, adding urea into the culture medium solution until the concentration is 20g/L, and culturing at the temperature of 30 ℃ and the pH value of 8 until the OD600 is 1.2 to prepare a bacillus megaterium bacterial solution; taking bacillus megaterium as a microbial agent IV;
and a mixed solution of 1.2mol \ L calcium acetate and 1.2mol \ L calcium lactate according to the volume ratio of 1:1 is used as a third cementing solution.
Experimental example 1 urease Activity
And (3) respectively culturing the microbial agent I, the microbial agent II, the microbial agent III and the microbial agent IV for 24 hours in a shaking table at the temperature of 35 ℃ and at the speed of 195r/min, centrifuging for 5 minutes at the speed of 10000r/min, removing supernate, and performing urease activity determination by adopting a Bertholt reaction colorimetric method.
Adding 5ml of glycerol into the microbial agent I, adding 12ml of glycerol into the microbial agent II, adding 7ml of glycerol into the microbial agent III, adding 7ml of glycerol into the microbial agent IV, respectively culturing for 24 hours at 35 ℃ and 195r/min by shaking table, centrifuging for 5 minutes at 10000r/min, removing supernatant, and performing urease activity determination by adopting a Bertholt reaction colorimetric method.
The results of measurement of urease activity of the microbial agent after addition of glycerin and the microbial agent without addition of glycerin are shown in FIG. 1.
According to the observation and discovery of a figure 1, the urease activities of a first microbial agent, a second microbial agent and a third microbial agent of a mixed bacterial solution formed by mixing a bacillus licheniformis bacterial solution and a bacillus megaterium bacterial solution are obviously higher than that of a fourth microbial agent only containing bacillus megaterium; in addition, the urease activities of the microbial agent I, the microbial agent II, the microbial agent III and the microbial agent IV added with the glycerol are improved.
Experimental example 2 repairing concrete cracks
280 parts of aluminate cement, 35 parts of fly ash, 35 parts of slag powder, 800 parts of sand, 980 parts of high alumina macadam, 178 parts of water, 3.5 parts of water reducing agent, 350 parts of rubber material and 5 kg/m of steel fiber3The test pieces of rectangular blast furnace concrete having dimensions of 10cm × 10cm × 40cm were prepared in groups of one to five 5, and after preparation, the test pieces were stored in a mold at room temperature of (20 s 2) ° c for 24 hours. After demolding, curing is carried out for 28 days in saturated lime water at the temperature of (20 seconds 2). Samples of each group were prepared in 3, tested under the same conditions and the test results averaged. It should be noted that all test pieces need to be poured on the same day, the same materials and the same mixing ratio are adopted, and the pouring is performed under the same curing conditions after the mold is removed. And (3) pressing the slit at the speed of 0.3MPa/s and testing the original uniaxial compressive strength of each test block by adopting a WAW-1000KN microcomputer-controlled electro-hydraulic servo universal testing machine of a structural laboratory for each group of test pieces, and then putting the test pieces into water for repairing and maintaining for later use. Wherein, the uniaxial compressive strength is tested by a Material test System810(MTS810), the load precision is +0.5 percent, a displacement control mode is adopted, the axial line of the sample is parallel to the direction of the acting force, and the loading rate is 0.05 mm/min.
According to the volume ratio of 89: 155: 5 preparing a first microbial agent, a first cementing solution and glycerol into a first crack repairing solution; and (3) after the test piece I is repaired and maintained in the crack repairing liquid I for 0, 7 and 28 days, shooting and recording the cracks before and after the test piece is repaired by using a 500-time-code optical microscope, processing the image by using ImagePro Plus software, selecting the crack with the initial crack width of 300 mu m, measuring the crack width before and after the repair, and recording the crack repair rate. Wherein the fracture repair rate is initial fracture width-post-repair fracture width/initial fracture width.
Preparing a second microbial agent, a second cementing solution and glycerol into a second crack repairing solution according to the volume ratio of 55:116: 6; and (3) after the second test piece is repaired and maintained in the second crack repairing liquid for 0, 7 and 28 days, shooting and recording the cracks before and after the repair of the test piece by using a 500-times-code optical microscope, processing the image by using ImagePro Plus software, selecting the crack with the initial crack width of 300 mu m, measuring the crack width before and after the repair, and recording the crack repair rate.
Preparing a third microbial agent, a third cementing liquid and glycerol into a third crack repairing liquid according to the volume ratio of 97:165: 7; and (3) after the third test piece is repaired and maintained in the crack repairing liquid for 0, 7 and 28 days, shooting and recording the cracks before and after the repair of the test piece by using a 500-times-code optical microscope, processing the image by using ImagePro Plus software, selecting the crack with the initial crack width of 300 mu m, measuring the crack width before and after the repair, and recording the crack repair rate.
According to the volume ratio of 97:165:7 preparing a fourth microbial agent, a third cementing liquid and glycerol into a fourth crack repairing liquid; and (3) after the four test pieces are repaired and maintained for 0, 7 and 28d in the four crack repairing liquids, shooting and recording the cracks before and after the repair of the test pieces by using a 500-times-code optical microscope, processing the images by using ImagePro Plus software, selecting the crack with the initial crack width of 300 mu m, measuring the crack width before and after the repair, and recording the crack repair rate.
Preparing a microbial agent III and a cementing liquid III into a crack repairing liquid V according to the volume ratio of 97: 165; and (3) after the test piece five is repaired and maintained for 0, 7 and 28d in the four kinds of the crack repairing liquid, shooting and recording the cracks before and after the test piece is repaired by using a 500-times-code optical microscope, processing the image by using ImagePro Plus software, selecting the crack with the initial crack width of 300 mu m, measuring the crack width before and after the repair, and recording the crack repairing rate.
The measurement results of the crack repair rate of each group of test pieces after curing in the crack repair liquid are shown in fig. 2.
According to the observation and discovery of a figure 2, the crack repair rate of the first crack repair liquid, the second crack repair liquid and the third crack repair liquid of the mixed bacterial liquid formed by mixing the bacillus licheniformis bacterial liquid and the bacillus megaterium bacterial liquid is obviously higher than that of the fourth crack repair liquid only containing the bacillus megaterium; in addition, compared with the crack repairing liquid five without the glycerol, the crack repairing liquid I, the crack repairing liquid II and the crack repairing liquid III after the glycerol is added have the advantage that the crack repairing rate is improved.
After each group of test pieces are cured in the corresponding crack repairing liquid for 28 days, testing the uniaxial compressive strength; the uniaxial compressive strength test results of the respective sets of test pieces are shown in FIG. 3.
By observing and finding the graph in fig. 3, the uniaxial compressive strength of the test piece I, the test piece II and the test piece III cured by the mixed bacterial liquid formed by mixing the bacillus licheniformis bacterial liquid and the bacillus megaterium bacterial liquid is obviously higher than that of the test piece IV cured by the crack repairing liquid only containing bacillus megaterium; in addition, compared with the test piece cured by the crack repair liquid five without the glycerol, the uniaxial compressive strength of the test piece cured by the crack repair liquid containing the glycerol is improved.
Fracture particles that remain firmly connected after uniaxial compression testing are selected and analyzed by quantitative x-ray diffraction (XRD) to determine the constituent minerals of MICP in the sample. Quantitative X-ray diffraction (XRD) analysis discovers that the crystal structures of MICP generated in situ in cracks of a test piece I, a test piece II, a test piece III and a test piece V cured by mixed bacteria liquid of a bacillus megaterium microbial agent and a bacillus licheniformis microbial agent are different, deposited crystals are a mixture of columnar or rhombic calcite, spherical vaterite and cauliflower-shaped vaterite, the crystal morphologies of the calcite, the vaterite and the vaterite are different, the vaterite is spherical, the MICP can move along with grouting liquid, the MICP is distributed in a system relatively uniformly, the MICP is distributed in the system relatively uniformly, the overall strength of microbial agent mortar is improved, and the probability of uneven crack repairing strength distribution is reduced. And the MICP generated in situ in the crack of the test piece four cured by the crack repair liquid four which only adopts the bacillus megaterium fungicide mainly has a calcite crystal structure and a very small amount of spherulite.
Effect example 1
280 parts of aluminate cement, 35 parts of fly ash, 35 parts of slag powder, 800 parts of sand, 980 parts of high alumina macadam, 178 parts of water, 3.5 parts of water reducing agent, 350 parts of rubber material and 5 kg/m of steel fiber3Ratio of (A to (B)Examples rectangular parallelepiped blast furnace concrete test pieces having dimensions of 10cm × 10cm × 40cm were prepared, and after the preparation, these test pieces were stored in a mold at room temperature of (20 s 2) ° c for 24 hours. After demolding, curing is carried out for 28 days in saturated lime water at the temperature of (20 seconds 2). It should be noted that all test pieces need to be poured on the same day, the same materials and the same mixing ratio are adopted, and the pouring is performed under the same curing conditions after the mold is removed. And (3) pressing cracks on each group of test pieces at the speed of 0.3MPa/s by adopting a WAW-1000KN microcomputer control electro-hydraulic servo universal testing machine of a structural laboratory, and then putting the test pieces into water for repairing and maintaining for later use.
Five groups of test pieces with the initial crack length of 300 mu m are selected from the test pieces, 3 test pieces of each group are prepared and tested under the same conditions, and the test results are averaged. And cleaning cracks, detecting indexes such as crack shapes, lengths, widths, depths and the like of the test pieces, and recording.
Grouting operation is carried out on the first test piece, the second test piece and the third test piece at room temperature according to the following modes:
preparing 89: 155: 5, taking the microbial agent I, the cementing liquid I and the glycerol as standby; mixing the microbial agent I and glycerol, and sequentially filling the microbial agent I, the cementing liquid I and air into a crack of the test piece I by using an injector in a multi-cycle injection mode, wherein the number of the cycle batches is 5. The grouting pressure was 50 KPa. Wherein, the microbial agent and the cementing liquid are respectively stored in a slurry storage bottle for grouting.
Preparing 97:165:7 microbial agent III, cementing liquid III and glycerol according to the volume ratio for later use; and mixing the microbial agent III with glycerol, and sequentially filling the microbial agent III, the cementing liquid III and air into the second crack of the test piece by using an injector in a multi-cycle injection mode, wherein the number of the cycle batches is 6. The grouting pressure was 50 KPa.
Prepared according to the volume ratio of 97:165:7, taking the microbial agent IV, the cementing liquid III and the glycerol as standby; and mixing the microbial agent IV with glycerol, and sequentially filling the microbial agent IV, the cementing liquid III and air into the second crack of the test piece by using an injector in a multi-cycle injection mode, wherein the number of the cycle batches is 6. The grouting pressure was 50 KPa.
Grouting the test piece four and the test piece five according to the following modes:
preparing 89: 155: 5, taking the microbial agent I, the cementing liquid I and the glycerol as standby; and mixing the microbial agent I with glycerol, and sequentially filling the microbial agent I, the cementing liquid I and air into four cracks of the test piece by using an injector, wherein the filling pressure is 50 KPa.
Preparing 97:165:7 microbial agent III, cementing liquid III and glycerol according to the volume ratio for later use; and mixing the third microbial agent with glycerol, and sequentially filling the third microbial agent, the third cementing liquid and air into five cracks of the test piece by using an injector, wherein the filling pressure is 50 KPa.
After grouting is finished, shooting and recording cracks before and after repairing the test blocks in 7d, 14d and 28d of each group of test pieces by using a 500-multiple-code optical microscope, processing images by using ImagePro Plus software, measuring the width of the cracks before and after repairing, and recording the crack repairing rate.
The measurement results of the crack repair rate of each group of test pieces after curing in the crack repair liquid are shown in fig. 4.
The result shows that, in the same perfusion mode, compared with a single microbial agent containing a bacillus megaterium agent (test piece three), the crack repair rate of a mixed microbial agent containing the bacillus megaterium agent and a bacillus licheniformis agent (test piece one and test piece two) is higher; in addition, under the scene of adopting the same filling reagent, the repair rate of the first crack of the test piece is higher than that of the fourth crack of the test piece, and the repair rate of the second crack of the test piece is higher than that of the fifth crack of the test piece. The crack repair rate of the first test piece and the second test piece is close to 95%. The method is characterized in that a mode of repeated cyclic injection is adopted, and a grouting mode of sequentially injecting a microbial agent, a cementing liquid and air into the cracks of the test piece by using an injector is favorable for improving the crack repairing rate.
And (5) carrying out mercury intrusion test on each group of test piece samples after the crack is repaired for 28 d. The porosity of each test piece was measured, and is shown in FIG. 5.
Under the same perfusion mode, compared with a single microbial agent containing a bacillus megaterium agent (test piece three), the mixed microbial agent containing the bacillus megaterium agent and the bacillus licheniformis agent (test piece one and test piece two) has lower void ratio; in addition, under the scene of adopting the same filling reagent, the porosity of the test piece I is lower than that of the test piece IV, and the porosity of the test piece II is lower than that of the test piece V. The porosity of test pieces one and two is less than 10 μm. The grouting mode of multiple circulation injection is adopted to help reduce the porosity.
In conclusion, the microbial agent crack repairing liquid for repairing the blast furnace crack disclosed by the invention can improve the crack repairing efficiency of the microbial agent in the blast furnace concrete environment with high aggregate content and steel fiber by applying the mixed microbial agent containing the bacillus licheniformis and the bacillus megaterium.
Although the invention has been described in detail hereinabove by way of general description, specific embodiments and experiments, it will be apparent to those skilled in the art that many modifications and improvements can be made thereto based on the invention. Accordingly, such modifications and improvements do not depart from the spirit of the invention and are intended to be included within the scope of the invention.
Claims (5)
1. A blast furnace crack repairing method based on a microbial agent is characterized in that the microbial agent consisting of bacillus megaterium liquid and bacillus licheniformis liquid is mixed with glycerol to prepare a mixed liquid A; the mixed solution A and the cementing solution are used as microbial grouting materials;
injecting the microbial grouting material into the blast furnace cracks in N rounds by using injection equipment; wherein N is more than or equal to 5.
2. The method for repairing the blast furnace crack based on the microbial agent as claimed in claim 1, wherein the cementing solution is a mixed solution B prepared from 1.1mol \ L-1.5 mol \ L of calcium acetate and 1.1mol \ L-1.5 mol \ L of calcium lactate according to a molar ratio of 1: 1.
3. The method for repairing a crack in a blast furnace according to claim 1, wherein the crack is repaired by adding a microorganism bacterium agent,
the step of injecting the microbial grouting material into the blast furnace cracks by using an injection device comprises the following steps:
and injecting the mixed solution A, the mixed solution B and air into the blast furnace cracks in sequence by using injection equipment.
4. The method for repairing a crack in a blast furnace according to claim 1, wherein the crack is repaired by adding a microorganism bacterium agent,
inoculating bacillus megaterium to an LB (lysogeny broth) culture medium solution, adding urea into the culture medium solution until the concentration is 20g/L, and culturing at the temperature of 30 ℃ and the pH value of 8 until the OD600 is 1.2 to prepare a bacillus megaterium bacterial solution;
inoculating bacillus licheniformis into a culture medium solution, adding urea into the culture medium solution to a concentration of 17-21 g/L, and adding Ni (NO)3)2Until the concentration is 8-12 g/L; culturing at 40 deg.C and pH of 8.5 until OD600 is 1.2 to obtain Bacillus licheniformis liquid.
5. The method for repairing a crack in a blast furnace according to claim 4, wherein the crack is repaired by adding a microorganism bacterium agent,
the culture medium solution of the bacillus licheniformis comprises 25g/L of glucose, 12.5g/L of peptone, 5g/L of beef extract and 6.5g/L, KH of yeast extract2PO42g/L, NaCl 1g/L and H20 1L。
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