CN117285308A - Method for repairing concrete cracks by utilizing regenerated calcium source and modified zeolite powder through microorganism-induced calcium carbonate precipitation - Google Patents
Method for repairing concrete cracks by utilizing regenerated calcium source and modified zeolite powder through microorganism-induced calcium carbonate precipitation Download PDFInfo
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- CN117285308A CN117285308A CN202311261652.6A CN202311261652A CN117285308A CN 117285308 A CN117285308 A CN 117285308A CN 202311261652 A CN202311261652 A CN 202311261652A CN 117285308 A CN117285308 A CN 117285308A
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- 239000011575 calcium Substances 0.000 title claims abstract description 89
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title claims abstract description 87
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 87
- 239000000843 powder Substances 0.000 title claims abstract description 80
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 title claims abstract description 78
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical class O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 239000004567 concrete Substances 0.000 title claims abstract description 39
- 229910000019 calcium carbonate Inorganic materials 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 34
- 244000005700 microbiome Species 0.000 title claims abstract description 15
- 238000001556 precipitation Methods 0.000 title claims abstract description 15
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 30
- 239000010457 zeolite Substances 0.000 claims abstract description 30
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910001424 calcium ion Inorganic materials 0.000 claims abstract description 27
- 239000007788 liquid Substances 0.000 claims abstract description 27
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 14
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 8
- 239000011780 sodium chloride Substances 0.000 claims abstract description 7
- 239000001110 calcium chloride Substances 0.000 claims abstract description 6
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 6
- 239000000243 solution Substances 0.000 claims description 55
- 230000008439 repair process Effects 0.000 claims description 36
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 30
- 239000011259 mixed solution Substances 0.000 claims description 22
- 102000002322 Egg Proteins Human genes 0.000 claims description 19
- 108010000912 Egg Proteins Proteins 0.000 claims description 19
- 235000019738 Limestone Nutrition 0.000 claims description 19
- 210000003278 egg shell Anatomy 0.000 claims description 19
- 239000006028 limestone Substances 0.000 claims description 19
- 239000002893 slag Substances 0.000 claims description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 17
- 239000004202 carbamide Substances 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 15
- 235000015097 nutrients Nutrition 0.000 claims description 14
- 230000001580 bacterial effect Effects 0.000 claims description 12
- 230000010355 oscillation Effects 0.000 claims description 12
- 238000002360 preparation method Methods 0.000 claims description 11
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 239000004576 sand Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 239000004094 surface-active agent Substances 0.000 claims description 10
- 238000005119 centrifugation Methods 0.000 claims description 8
- 238000004090 dissolution Methods 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 6
- 241000193830 Bacillus <bacterium> Species 0.000 claims description 5
- 239000001888 Peptone Substances 0.000 claims description 5
- 108010080698 Peptones Proteins 0.000 claims description 5
- 235000015278 beef Nutrition 0.000 claims description 5
- 238000007865 diluting Methods 0.000 claims description 5
- 239000012153 distilled water Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 235000019319 peptone Nutrition 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 5
- 239000006228 supernatant Substances 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 238000012986 modification Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims description 3
- 230000000813 microbial effect Effects 0.000 claims description 3
- QAQSNXHKHKONNS-UHFFFAOYSA-N 1-ethyl-2-hydroxy-4-methyl-6-oxopyridine-3-carboxamide Chemical compound CCN1C(O)=C(C(N)=O)C(C)=CC1=O QAQSNXHKHKONNS-UHFFFAOYSA-N 0.000 claims description 2
- 229920001661 Chitosan Polymers 0.000 claims description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- 239000000945 filler Substances 0.000 claims description 2
- 239000001963 growth medium Substances 0.000 claims description 2
- 238000002715 modification method Methods 0.000 claims description 2
- 229910017604 nitric acid Inorganic materials 0.000 claims description 2
- 238000000643 oven drying Methods 0.000 claims description 2
- 239000012266 salt solution Substances 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 230000006698 induction Effects 0.000 claims 2
- 239000002244 precipitate Substances 0.000 abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 13
- 239000013078 crystal Substances 0.000 abstract description 9
- 101000965313 Legionella pneumophila subsp. pneumophila (strain Philadelphia 1 / ATCC 33152 / DSM 7513) Aconitate hydratase A Proteins 0.000 abstract description 7
- 239000002910 solid waste Substances 0.000 abstract description 6
- 238000005342 ion exchange Methods 0.000 abstract description 4
- 239000004568 cement Substances 0.000 abstract description 3
- 239000000377 silicon dioxide Substances 0.000 abstract description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 abstract description 2
- 239000000920 calcium hydroxide Substances 0.000 abstract description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 abstract description 2
- 238000007596 consolidation process Methods 0.000 abstract description 2
- 230000036571 hydration Effects 0.000 abstract description 2
- 238000006703 hydration reaction Methods 0.000 abstract description 2
- 239000000047 product Substances 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 1
- 229910052710 silicon Inorganic materials 0.000 abstract 1
- 239000010703 silicon Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 239000004570 mortar (masonry) Substances 0.000 description 21
- 230000001954 sterilising effect Effects 0.000 description 12
- 230000005540 biological transmission Effects 0.000 description 6
- 238000001000 micrograph Methods 0.000 description 6
- 238000004659 sterilization and disinfection Methods 0.000 description 6
- 229910021532 Calcite Inorganic materials 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000012258 culturing Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000012512 characterization method Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000006911 nucleation Effects 0.000 description 3
- 238000010899 nucleation Methods 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 2
- DVBJBNKEBPCGSY-UHFFFAOYSA-M cetylpyridinium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+]1=CC=CC=C1 DVBJBNKEBPCGSY-UHFFFAOYSA-M 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000010806 kitchen waste Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 239000002159 nanocrystal Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229940088417 precipitated calcium carbonate Drugs 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/08—Slag cements
- C04B28/082—Steelmaking slags; Converter slags
-
- 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
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00663—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like
- C04B2111/00672—Pointing or jointing materials
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for repairing concrete cracks by utilizing a regenerated calcium source and modified zeolite powder through microorganism-induced calcium carbonate precipitation, wherein the regenerated calcium source from solid waste is treated to obtain a calcium ion-containing repairing liquid which is applied to MICP for repairing concrete cracks, the repaired cracks have good impermeability, and the generated precipitate also has good consolidation capability and good crystal morphology. The zeolite powder used in the invention contains active silicon dioxide and silicon trioxide, and can react with calcium hydroxide, a hydration product of cement, to generate a gel substance, thereby improving the cementing capability of MICP. The zeolite modified by sodium chloride and calcium chloride has larger ion exchange capacity and can adsorb ammonia nitrogen generated by MICP.
Description
Technical Field
The invention relates to the technical field of concrete crack repair, in particular to a method for repairing concrete cracks by utilizing a regenerated calcium source and modified zeolite powder through microorganism-induced calcium carbonate precipitation.
Background
The concrete has the advantages of high compressive strength, good durability, low cost and the like, and is widely applied to a series of civil engineering such as houses, bridges, roads, water conservancy, water transportation and the like. However, in the construction and service process of the concrete structure, the inside or the surface of the concrete is difficult to avoid micro cracks or local defects, the integrity and the durability of the concrete structure are reduced, even catastrophic events are caused, and the life and property safety of people is threatened. The traditional concrete crack repairing methods comprise a surface repairing method, a grouting method, a concrete replacement method, a filling method and the like, but the methods still have great problems in the aspects of repairing effect, economy, environmental protection and the like.
Therefore, it is necessary to develop a new economical concrete crack repairing technology.
Disclosure of Invention
The invention aims to solve the problems and provide a method for repairing concrete cracks by utilizing a regenerated calcium source and modified zeolite powder through microorganism-induced calcium carbonate precipitation. The invention realizes the above purpose through the following technical scheme:
a method for repairing concrete cracks by utilizing a regenerated calcium source and modified zeolite powder through microorganism-induced calcium carbonate precipitation comprises the following steps:
s1: preparation of culture solution: the culture solution is CASO+urea culture medium: 5.0+/-0.5 g/L of peptone, 3.0+/-0.3 g/L of beef extract, 20.0+/-2 g/L of urea, 1.0L of distilled water and pH value of 7.0+/-0.5;
s2: preparing bacterial liquid: b, inoculating strains to the culture solution obtained in the step S1 after the bacillus barbituralis is activated by a flat plate, placing an oscillating box for oscillation after the strains are inoculated, setting the temperature to be 32-38 ℃, and continuously culturing for 18-24 hours at the rotating speed of 120-170 rpm;
s3: preparing a regenerated calcium source nutrient solution: the eggshell powder, limestone powder and steel slag are taken as a regenerated calcium source, acid is used for dissolution according to a certain proportion, and after the regenerated calcium source is completely dissolved, the eggshell powder, the limestone powder and the steel slag are put into an oscillating box for oscillation for 6-12 hours; centrifuging by a centrifuge after oscillation is finished, taking supernatant after centrifugation is finished, and regulating pH to 7.0-7.5 to obtain a dissolved regenerated calcium source; diluting the solution to obtain a calcium source with the calcium ion concentration of 0.25mol/L, and dissolving urea with the calcium ion concentration of 0.25mol/L to obtain the bioremediation concrete crack nutrient solution;
s4: preparing modified zeolite powder: carrying out composite modification on zeolite powder by utilizing salt and surfactant; the specific modification method comprises the following steps: weighing a certain amount of surfactant and salt, dissolving in 1L of deionized water, adding a certain amount of zeolite powder, and stirring for 6 hours at 30-40 ℃; centrifuging, washing with deionized water for 3 times, and oven drying at 60-65deg.C;
s5: preparation of repair liquid: uniformly stirring zeolite powder, sand and bacterial liquid according to a certain proportion to prepare a first mixed liquid; mixing a calcium source solution and a urea solution according to a ratio of 1: mixing the materials according to the volume ratio of 1 to obtain a second mixed solution;
s6: grouting to repair concrete cracks: and repairing the concrete cracks by using grouting equipment through a grouting method.
In a further scheme, in the step S1, the prepared nutrient solution is sterilized at a high temperature of 121+/-1 ℃ for 15+/-5 min.
In the step S3, the acid is acetic acid, nitric acid and hydrochloric acid, and the rotation speed of the centrifugal machine is 5500 rpm-6500 rpm;
the mass fraction of the acetic acid solution is 10% -50%, and the mass ratio of the regenerated calcium source to the acid is 1: 2-1: 6.
in a further scheme, in the step S4, the salt solution is sodium chloride or calcium chloride; in the modification process of natural zeolite by using salt, na with smaller ionic radius + 、Ca 2+ With original Mg in zeolite pore canal 2+ Ion exchange reaction is carried out on the metal ions, and the modified zeolite contains more Na + 、Ca 2+ The zeolite pore canal is expanded, and the ion exchange capacity is increased.
The concentration of the sodium chloride and calcium chloride solution is 1-2.5 mol/L; the surfactant is one or more of cetyl trimethyl ammonium bromide, cetyl pyridinium bromide and chitosan; the surface active agent modification is to form a single layer or a plurality of layers of loads on the surface of the zeolite powder, so that negative charges on the surface of the zeolite powder are exchanged into positive charges, and microorganisms with more negative ions can be adsorbed to form nucleation sites of the microorganism mineralized calcium carbonate.
The dosage of the surfactant is 50-80% of the mass of zeolite; the mixing amount of the zeolite is 10-30 g;
the zeolite powder has a particle size of 200-250 meshes.
In a further scheme, in the step S5, the first mixed solution is prepared from the following components: zeolite powder: 50-100 parts; sand: 10-100 parts; bacterial liquid: 60-200 parts;
the second mixed solution is the regenerated calcium source nutrient solution prepared in the step S3; the particle size of the filler sand is 150-200 meshes.
In a further aspect, in the step S6, the grouting method includes: firstly, a concrete matrix at the crack occurrence position is cleaned by an air compressor under the pressure of 0.5-0.8 MPa, grouting holes are arranged at the positions of the crack width larger than 0.2mm or the positions of the crack staggering and penetrating positions, and the center holes of the grouting holes are aligned to the crack position. And setting a repair point at intervals of 30-50 cm. Injecting grouting components into a grouting nozzle in batches through a grouting pipe to fill cracks; and after grouting is finished, the grouting center is blocked by a sealing bolt, so that grouting components are prevented from overflowing. And after the grouting components in the cracks are initially set, removing the grouting nozzle.
Injecting the mixed solution 1 into the concrete cracks at a pressure of 0.3-0.5 MPa by using grouting equipment; and stopping grouting after the grouting quantity meets the set value, and maintaining the pressure for 5-10 min. Injecting the mixed solution 2 into the concrete cracks by using grouting equipment at the pressure of 0.2-0.3 MPa, stopping grouting after the grouting amount reaches a set value, maintaining the pressure for 10-15 min, standing for 0.5-1 h, and repeating the grouting step; until a large amount of liquid overflows, and grouting is finished.
The grouting quantity set value is related to the size and the number of concrete cracks, and is 50-150 ml.
The invention has the beneficial effects that:
1) The method utilizes the regenerated calcium source from the solid waste to process to obtain the repairing liquid containing calcium ions, and the repairing liquid is applied to MICP repairing concrete cracks, so that the repaired cracks have good impermeability, and the generated precipitate also has good consolidation capability and good crystal morphology.
2) The zeolite powder contains active silica and silica, and can react with calcium hydroxide as hydration product of cement to produce gel material to raise the cementing capacity of MICP.
3) The zeolite modified by sodium chloride and calcium chloride has larger ion exchange capacity and can adsorb ammonia nitrogen generated by MICP.
4) According to Gibbs-Tompson crystal nucleation theory, crystals have a critical size when nucleated, nanocrystals smaller than the size tend to dissolve, and cores larger than the size can continue to grow steadily; the zeolite modified by the surfactant has positive charges and can enrich negatively charged microbial cells, the nucleation probability of calcium carbonate crystals is greatly increased, and the calcium carbonate crystals are more compact and stable.
5) The price of chemical analysis calcium commonly used in the technology of repairing concrete by microorganism induced calcium carbonate precipitation is about 40-60 yuan/kg. Eggshell powder belongs to kitchen waste; limestone powder is used as a byproduct in the process of generating broken stone and stone dust; steel slag is a byproduct of the steelmaking process. The three materials are applied to the MICP technology, are the secondary utilization of solid wastes, and have good economical and environmental protection properties.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the practical drawings required in the embodiments or the prior art description, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1a is a morphology characterization of eggshell powder as a source of regenerated calcium to obtain calcium carbonate precipitate.
FIG. 1b is a morphological characterization of calcium carbonate precipitate obtained from limestone powder as a source of regenerated calcium.
FIG. 1c is a morphology characterization of a steel slag as a source of regenerated calcium to obtain a calcium carbonate precipitate.
Fig. 2a is a transmission electron microscope image of the surface morphology of calcium carbonate precipitate obtained with eggshell powder as a source of regenerated calcium.
Fig. 2b is a transmission electron microscope image of the surface morphology of calcium carbonate precipitate obtained with eggshell powder as a source of regenerated calcium.
FIG. 3a is a transmission electron microscope image of the surface morphology of a calcium carbonate precipitate obtained with limestone powder as a source of regenerated calcium.
FIG. 3b is a transmission electron microscope image of the surface morphology of calcium carbonate precipitate obtained with limestone powder as the source of regenerated calcium.
FIG. 4a is a transmission electron microscope image of the surface morphology of calcium carbonate precipitate obtained from steel slag as a source of recycled calcium.
FIG. 4b is a transmission electron microscope image of the surface morphology of calcium carbonate precipitate obtained from steel slag as a source of recycled calcium.
FIG. 5a is a graph showing the surface of a test piece before restoration, with eggshell powder as a source of regenerated calcium.
Fig. 5b is a surface view of the eggshell powder as a regenerated calcium source after the test piece is repaired.
FIG. 5c is a graph of the surface of a test piece before restoration with limestone powder as the source of regenerated calcium.
FIG. 5d is a surface view of a repaired test piece with limestone powder as the source of regenerated calcium.
FIG. 5e is a graph showing the surface of a test piece before restoration, wherein steel slag is used as a regenerated calcium source.
FIG. 5f is a surface view of a repaired test piece with steel slag as a source of regenerated calcium.
FIG. 6 shows the change in permeability coefficient of the test piece after the restoration mortar using eggshell powder, limestone powder and steel slag as the regenerated calcium source.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.
Concrete often has microcracks therein, and crack propagation generally goes through three stages: crack initiation, stable propagation, and unstable fracture. The expansion of the cracks is accompanied by a change in energy, which is enormous for the cracks to propagate through the coarse aggregate. Therefore, crack extension in ordinary concrete is often located in the mortar and mortar-aggregate interface transition zone, and the energy developed through coarse aggregate is not reached, and the material is destroyed. In order to practically evaluate the implementation effect of the invention and eliminate the influence of coarse aggregate, mortar test pieces are adopted in the examples.
Test piece and crack preparation:
the test piece mixing ratio is sand: water: cement=5:1:2.5, and reinforcing steel bars with a diameter of 7mm are added in the forming process so as to facilitate subsequent prefabrication cracks. The test pieces were cured for 28 days under standard conditions (temperature 20.+ -. 2 ℃ C., relative humidity 95.+ -. 3%).
After curing, taking out the test piece from the curing room, wiping off surface moisture by using a dry towel, and pressing cracks on the bending test machine by adopting a three-point pressure method, wherein the test piece without the prefabricated cracks is used as a control group of a penetration test.
Example 1
The method comprises the following steps:
1. preparation of culture solution:
selecting 5.0+/-0.5 g/L of peptone, 3.0+/-0.3 g/L of beef extract, 20.0+/-2 g/L of urea and 1.0L of distilled water, mixing to obtain a culture solution, and regulating the pH value of the culture solution to 7.0+/-0.5; sterilizing the prepared culture solution at high temperature and then sterilizing by ultraviolet. The high temperature sterilization temperature is 120+/-5 ℃, and the sterilization time is 20+/-5 min.
2. Preparing bacterial liquid:
and (2) inoculating strains to the culture solution obtained in the step (S1) after the bacillus barbituralis is activated by a flat plate, placing an oscillating box for oscillation after the strains are inoculated, setting the temperature to be 32-38 ℃, and continuously culturing for 18-24 hours at the rotating speed of 120-170 rpm.
3. Preparing a regenerated calcium source nutrient solution:
limestone powder is used as a regenerated calcium source, and solid waste and acetic acid with the mass fraction of 20% are mixed according to the ratio of 1: 2-1: 4, dissolving in a mass ratio, and putting the regenerated calcium source into an oscillating box to oscillate for 3-12 hours after the regenerated calcium source is completely dissolved; centrifuging by a centrifugal machine after oscillation is completed, taking supernatant after centrifugation is completed, adjusting pH to 7.0-7.5 to obtain a dissolved regenerated calcium source, and measuring the concentration of dissolved calcium ions by a calcium ion meter, wherein the concentration of the dissolved calcium ions is shown in Table 1.
TABLE 1 calcium ion concentration after dissolution of limestone powder calcium source and 20% acetic acid solution in different proportions
As can be seen from Table 1, the dissolution of limestone powder for about 12 hours substantially reaches the maximum dissolution amount, and the maximum calcium ion concentration is 1:2, 0.7665mol/L. And diluting the solution to obtain a calcium source with the calcium ion concentration of 0.25mol/L, and dissolving urea with the calcium ion concentration of 0.25mol/L to obtain the bioremediation mortar crack nutrient solution.
4. Preparing modified zeolite powder:
7g of cetyltrimethylammonium bromide and 60g of sodium chloride are weighed and dissolved in 1L of deionized water, then 10g of zeolite powder of 250 meshes are added, and stirring is carried out for 6 hours at the temperature of 30-40 ℃. And (3) washing with deionized water for 3 times after centrifugation, and drying at 60-65 ℃.
5. Preparation of repair liquid:
zeolite powder, 200-mesh sand and bacterial liquid are mixed according to the proportion: 50:50:100, uniformly stirring to prepare a mixed solution 1; urea powder calcium source solution was prepared according to 1: mixing the mixture in a volume ratio of 1 to obtain a mixed solution 2.
6. Grouting repair mortar cracks:
(1) Firstly, cleaning a scattered layer, dust, dirt and the like on a mortar matrix at a crack occurrence position by using an air compressor at a pressure of 0.8 MPa;
(2) Arranging grouting holes at positions with the crack width being more than 0.2mm or at positions where the cracks are staggered, penetrating the positions and the like, aligning the central holes of the grouting holes with the crack positions, and arranging a repairing point at intervals of 30-50 cm;
(3) Injecting 100ml of the mixed solution 1 into the mortar cracks by a grouting device at a pressure of 0.5MPa, stopping grouting, and maintaining the pressure for 5-10 min;
(4) Injecting 100ml of mixed solution 2 into the mortar cracks by grouting equipment at the pressure of 0.3MPa, maintaining the pressure for 10-15 min, and standing for 0.5-1 h;
(5) Repeating the grouting steps (3) - (4); until a large amount of liquid overflows, and grouting is finished;
(6) The grouting center is blocked by a sealing bolt, so that grouting components are prevented from overflowing;
(7) And after the grouting components in the cracks are initially set, removing the grouting nozzle.
As shown in fig. 1b, calcium carbonate precipitated after the repair of the repair group of limestone powder as a regenerated calcium source has calcite (C represents calcite) and vaterite (V represents vaterite).
As shown in fig. 3, calcium carbonate produced after the restoration of the restoration group using limestone powder as a regenerated calcium source is precipitated as calcite in a block shape, and the crystal arrangement is compact.
Fig. 5c and 5d are front and rear comparative diagrams of the repair group using limestone powder as a regenerated calcium source for repairing the crack, fig. 5c is a photograph of the crack before repair, and fig. 5d is a photograph of the crack after repair.
As shown in FIG. 6, the permeability coefficient of the mortar test piece after the repair of the repair group with limestone powder as the regenerated calcium source is 3.79×10 -5 cm/s
Example 2
The method comprises the following steps:
1. preparation of culture solution:
selecting 5.0+/-0.5 g/L of peptone, 3.0+/-0.3 g/L of beef extract, 20.0+/-2 g/L of urea and 1.0L of distilled water, mixing to obtain a culture solution, and regulating the pH value of the culture solution to 7.0+/-0.5; sterilizing the prepared culture solution at high temperature and then sterilizing by ultraviolet. The high temperature sterilization temperature is 120+/-5 ℃, and the sterilization time is 20+/-5 min.
2. Preparing bacterial liquid:
and (2) inoculating strains to the culture solution obtained in the step (S1) after the bacillus barbituralis is activated by a flat plate, placing an oscillating box for oscillation after the strains are inoculated, setting the temperature to be 32-38 ℃, and continuously culturing for 18-24 hours at the rotating speed of 120-170 rpm.
3. Preparing a regenerated calcium source nutrient solution:
taking eggshell powder as a regenerated calcium source, and mixing solid waste with 20% acetic acid according to the mass fraction of 1: 2-1: 4, dissolving in a mass ratio, and putting the regenerated calcium source into an oscillating box to oscillate for 3-12 hours after the regenerated calcium source is completely dissolved; centrifuging by a centrifugal machine after oscillation is completed, taking supernatant after centrifugation is completed, adjusting pH to 7.0-7.5 to obtain a dissolved regenerated calcium source, and measuring the concentration of dissolved calcium ions by a calcium ion meter, wherein the concentration of the dissolved calcium ions is shown in Table 2.
TABLE 2 calcium ion concentration after different proportions of eggshell powder calcium source and 20% acetic acid solution were dissolved
From Table 2, it can be seen that the eggshell powder was dissolved for about 12 hours to substantially reach the maximum dissolution amount, and the maximum calcium ion concentration was 1:2, 0.6165mol/L. And diluting the solution to obtain a calcium source with the calcium ion concentration of 0.25mol/L, and dissolving urea with the calcium ion concentration of 0.25mol/L to obtain the bioremediation mortar crack nutrient solution.
4. Preparing modified zeolite powder:
5g of cetyl pyridine bromide and 111g of calcium chloride are weighed and dissolved in 1L of deionized water, then 10g of zeolite powder with 250 meshes is added, and stirring is carried out for 6 hours at the temperature of 30-40 ℃. And (3) washing with deionized water for 3 times after centrifugation, and drying at 60-65 ℃.
5. Preparation of repair liquid:
zeolite powder, 200-mesh sand and bacterial liquid are mixed according to the proportion: 50:50:100, uniformly stirring to prepare a mixed solution 1; urea powder calcium source solution was prepared according to 1: mixing the mixture in a volume ratio of 1 to obtain a mixed solution 2.
6. Grouting repair mortar cracks:
(1) Firstly, cleaning a scattered layer, dust, dirt and the like on a mortar matrix at a crack occurrence position by using an air compressor at a pressure of 0.8 MPa;
(2) Arranging grouting holes at positions with the crack width being more than 0.2mm or at positions where the cracks are staggered, penetrating the positions and the like, aligning the central holes of the grouting holes with the crack positions, and arranging a repairing point at intervals of 30-50 cm;
(3) Injecting 100ml of the mixed solution 1 into the mortar cracks by a grouting device at a pressure of 0.5MPa, stopping grouting, and maintaining the pressure for 5-10 min;
(4) Injecting 100ml of mixed solution 2 into the mortar cracks by grouting equipment at the pressure of 0.3MPa, maintaining the pressure for 10-15 min, and standing for 0.5-1 h;
(5) Repeating the grouting steps (3) - (4); until a large amount of liquid overflows, and grouting is finished;
(6) The grouting center is blocked by a sealing bolt, so that grouting components are prevented from overflowing;
(7) And after the grouting components in the cracks are initially set, removing the grouting nozzle.
As shown in fig. 1a, the calcium carbonate precipitate fraction produced after repair of the prosthetic group of eggshell powder as a source of regenerated calcium is vaterite (V represents vaterite).
As shown in fig. 2, the calcium carbonate produced after the repair of the prosthetic group of eggshell powder as a source of regenerated calcium was compact hexagonal calcite and more smooth surface litchi-like vaterite.
Fig. 5a and 5b are front and rear comparison diagrams of repair groups with eggshell powder as a regenerated calcium source, fig. 5a is a photograph of a crack before repair, and fig. 5b is a photograph of a crack after repair.
As shown in FIG. 6, the permeability coefficient of the mortar test piece after the repair of the repair group by using eggshell powder as the regenerated calcium source is 1.17X10 -4 cm/s
Example 3
The method comprises the following steps:
1. preparation of culture solution:
selecting 5.0+/-0.5 g/L of peptone, 3.0+/-0.3 g/L of beef extract, 20.0+/-2 g/L of urea and 1.0L of distilled water, mixing to obtain a culture solution, and regulating the pH value of the culture solution to 7.0+/-0.5; sterilizing the prepared culture solution at high temperature and then sterilizing by ultraviolet. The high temperature sterilization temperature is 120+/-5 ℃, and the sterilization time is 20+/-5 min.
2. Preparing bacterial liquid:
and (2) inoculating strains to the culture solution obtained in the step (S1) after the bacillus barbituralis is activated by a flat plate, placing an oscillating box for oscillation after the strains are inoculated, setting the temperature to be 32-38 ℃, and continuously culturing for 18-24 hours at the rotating speed of 120-170 rpm.
3. Preparing a regenerated calcium source nutrient solution:
taking steel slag as a regenerated calcium source, and mixing solid waste with 20% acetic acid according to the mass fraction of 1: 2-1: 4, dissolving in a mass ratio, and putting the regenerated calcium source into an oscillating box to oscillate for 3-12 hours after the regenerated calcium source is completely dissolved; centrifuging by a centrifugal machine after oscillation is completed, taking supernatant after centrifugation is completed, adjusting pH to 7.0-7.5 to obtain a dissolved regenerated calcium source, and measuring the concentration of dissolved calcium ions by a calcium ion meter, wherein the concentration of the dissolved calcium ions is shown in Table 3.
TABLE 3 calcium ion concentration after dissolution of slag calcium source and 20% acetic acid solution in different proportions
It can be seen from Table 3 that the steel slag is dissolved for about 12 hours to substantially reach the maximum dissolution amount, and the maximum calcium ion concentration is 1:2 is 0.5021mol/L. And diluting the solution to obtain a calcium source with the calcium ion concentration of 0.25mol/L, and dissolving urea with the calcium ion concentration of 0.25mol/L to obtain the bioremediation mortar crack nutrient solution.
4. Preparing modified zeolite powder:
5g of cetyl pyridine bromide and 111g of calcium chloride are weighed and dissolved in 1L of deionized water, then 10g of zeolite powder with 250 meshes is added, and stirring is carried out for 6 hours at the temperature of 30-40 ℃. And (3) washing with deionized water for 3 times after centrifugation, and drying at 60-65 ℃.
5. Preparation of repair liquid:
zeolite powder, 200-mesh sand and bacterial liquid are mixed according to the proportion: 50:50:100, uniformly stirring to prepare a mixed solution 1; urea powder calcium source solution was prepared according to 1: mixing the mixture in a volume ratio of 1 to obtain a mixed solution 2.
6. Grouting repair mortar cracks:
(1) Firstly, cleaning a scattered layer, dust, dirt and the like on a mortar matrix at a crack occurrence position by using an air compressor at a pressure of 0.8 MPa;
(2) Arranging grouting holes at positions with the crack width being more than 0.2mm or at positions where the cracks are staggered, penetrating the positions and the like, aligning the central holes of the grouting holes with the crack positions, and arranging a repairing point at intervals of 30-50 cm;
(3) Injecting 100ml of the mixed solution 1 into the mortar cracks by a grouting device at a pressure of 0.5MPa, stopping grouting, and maintaining the pressure for 5-10 min;
(4) Injecting 100ml of mixed solution 2 into the mortar cracks by grouting equipment at the pressure of 0.3MPa, maintaining the pressure for 10-15 min, and standing for 0.5-1 h;
(5) Repeating the grouting steps (3) - (4); until a large amount of liquid overflows, and grouting is finished;
(6) The grouting center is blocked by a sealing bolt, so that grouting components are prevented from overflowing;
(7) And after the grouting components in the cracks are initially set, removing the grouting nozzle.
As shown in fig. 1, the calcium carbonate precipitates generated after the repair of the repair group with steel slag as a regenerated calcium source are all substantially vaterite (V represents vaterite).
As shown in fig. 4, calcium carbonate produced after the repair of the repair group, in which steel slag was used as a source of regenerated calcium, precipitated as spherical vaterite.
As shown in fig. 5e and 5f, the steel slag is used as a comparative graph of the repair group of the regenerated calcium source before and after repair, fig. 5e is a photograph of the crack before repair, and fig. 5f is a photograph of the crack after repair.
As shown in FIG. 6, the permeability coefficient of the mortar test piece after the repair of the steel slag group as the regenerated calcium source is 2.9X10 -4 cm/s。
Wherein eggshell powder and steel slag are used as a repairing group of a regenerated calcium source, calcium carbonate precipitates generated after repairing are mainly vaterite, the crystal strength is low, the structure is loose and unstable, and the permeability coefficients of the repaired test pieces are respectively 1.17 multiplied by 10 -4 cm/s and 2.9X10 -4 cm/s. The limestone powder is used as a restoration group of a regenerated calcium source, and the main precipitated calcium carbonate after restoration is calcite with a blocky crystal structure; compared with examples 2 and 3, the adhesive property in cracks is better, and the impermeability of the test piece after repair is better and is 3.79 multiplied by 10 -5 cm/s。
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further. Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (8)
1. The method for repairing the concrete cracks by utilizing the regenerated calcium source and the modified zeolite powder through microorganism-induced calcium carbonate precipitation is characterized by comprising the following steps of:
s1: preparation of culture solution: the culture solution is CASO+urea culture medium: 5.0+/-0.5 g/L of peptone, 3.0+/-0.3 g/L of beef extract, 20.0+/-2 g/L of urea, 1.0L of distilled water and pH value of 7.0+/-0.5;
s2: preparing bacterial liquid: b, after the bacillus barbituralis is activated by a flat plate, inoculating strains into the culture solution obtained in the step S1, and placing an oscillating box for oscillation after the strains are inoculated;
s3: preparing a regenerated calcium source nutrient solution: the eggshell powder, limestone powder and steel slag are taken as a regenerated calcium source, acid is used for dissolution according to a certain proportion, and after the regenerated calcium source is completely dissolved, the eggshell powder, the limestone powder and the steel slag are put into an oscillating box for oscillation for 6-12 hours; centrifuging by a centrifuge after oscillation is finished, taking supernatant after centrifugation is finished, and regulating pH to 7.0-7.5 to obtain a dissolved regenerated calcium source; diluting the solution to obtain a calcium source with the calcium ion concentration of 0.25mol/L, and dissolving urea with the calcium ion concentration of 0.25mol/L to obtain the bioremediation concrete crack nutrient solution;
s4: preparing modified zeolite powder: carrying out composite modification on zeolite powder by utilizing salt and surfactant; the specific modification method comprises the following steps: weighing a certain amount of surfactant and salt, dissolving in 1L of deionized water, adding a certain amount of zeolite powder, and stirring for 6 hours at 30-40 ℃; centrifuging, washing with deionized water for 3 times, and oven drying at 60-65deg.C;
s5: preparation of repair liquid: uniformly stirring zeolite powder, sand and bacterial liquid according to a certain proportion to prepare a first mixed liquid; mixing a calcium source solution and a urea solution according to a ratio of 1: mixing the materials according to the volume ratio of 1 to obtain a second mixed solution;
s6: grouting to repair concrete cracks: and repairing the concrete cracks by using grouting equipment through a grouting method.
2. The method for repairing concrete cracks by microbial induction of calcium carbonate precipitation using a regenerated calcium source and modified zeolite powder according to claim 1, wherein in the step S1, the prepared nutrient solution is sterilized at a high temperature of 121 ℃ ± 1 ℃ for 15±5min.
3. The method for repairing concrete cracks by microorganism-induced calcium carbonate precipitation using a regenerated calcium source and modified zeolite powder according to claim 1, wherein in the step S2, the shaking box is set at a temperature of 32-38 ℃ and a rotation speed of 120-170 rpm, and the culture is continued for 18-24 hours.
4. The method for repairing concrete cracks by microorganism-induced calcium carbonate precipitation by using a regenerated calcium source and modified zeolite powder according to claim 1, wherein in the step S3, the acid is acetic acid, nitric acid or hydrochloric acid, and the rotation speed of the centrifuge is 5500 rpm-6500 rpm;
the mass fraction of the acetic acid solution is 10% -50%, and the mass ratio of the regenerated calcium source to the acid is 1: 2-1: 6.
5. the method for repairing concrete cracks by microbial induction of calcium carbonate precipitation using a regenerated calcium source and modified zeolite powder according to claim 1, wherein in the step S4, the salt solution is sodium chloride or calcium chloride; the concentration of the sodium chloride and calcium chloride solution is 1-2.5 mol/L; the surfactant is one or more of cetyltrimethylammonium bromide, cetylpyridinium bromide and chitosan.
6. The method for repairing concrete cracks by microorganism-induced calcium carbonate precipitation by using a regenerated calcium source and modified zeolite powder according to claim 1, wherein in the step S4, the amount of the surfactant is 50-80% of the mass of the zeolite; the mixing amount of the zeolite is 10-30 g;
the zeolite powder has a particle size of 200-250 meshes.
7. The method for repairing concrete cracks by microorganism-induced calcium carbonate precipitation using a regenerated calcium source and modified zeolite powder as claimed in claim 1, wherein in the step S5, the first mixed solution is prepared by: zeolite powder: 50-100 parts; sand: 10-100 parts; bacterial liquid: 60-200 parts;
the second mixed solution is the regenerated calcium source nutrient solution prepared in the step S3; the particle size of the filler sand is 150-200 meshes.
8. The method for repairing concrete cracks by microorganism-induced calcium carbonate precipitation using a regenerated calcium source and modified zeolite powder according to claim 1, wherein in the step S6, the grouting method comprises: injecting the first mixed solution into the concrete cracks at a pressure of 0.3-0.5 MPa by using grouting equipment; stopping grouting when the grouting amount meets a set value, and maintaining the pressure for 5-10 min; injecting the second mixed solution into the concrete crack by using grouting equipment at the pressure of 0.2-0.3 MPa, stopping grouting after the grouting amount reaches a set value, maintaining the pressure for 10-15 min, and repeating the grouting step after standing for 0.5-1 h; until a large amount of liquid overflows, and grouting is finished.
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