CN108455934B - Anaerobic bacterium self-healing crack concrete - Google Patents
Anaerobic bacterium self-healing crack concrete Download PDFInfo
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- CN108455934B CN108455934B CN201810317853.6A CN201810317853A CN108455934B CN 108455934 B CN108455934 B CN 108455934B CN 201810317853 A CN201810317853 A CN 201810317853A CN 108455934 B CN108455934 B CN 108455934B
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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
- 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
- C04B28/04—Portland cements
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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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
- 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
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- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
The invention provides anaerobic bacterium self-healing crack concrete which mainly comprises portland cement, aggregate, mineral powder, modified cellulose fiber, an anaerobic bacterium compound and water.
Description
Technical Field
The invention belongs to the field of concrete, and particularly relates to anaerobic bacterium self-healing crack concrete.
Background
The concrete has the advantages of high compressive strength, good durability, low cost and the like, and is widely applied to the field of building engineering. However, concrete is a typical brittle material, and micro cracks or local damage are inevitably generated under the action of external force or other factors, so that the mechanical property and durability of the concrete are reduced. If effective treatment measures are not taken in time, cracks can be further expanded, so that harmful substances such as water, oxygen, carbon dioxide, chloride and the like can easily enter the concrete, the steel bars can be corroded, even macro cracks can be caused, brittle fracture can be caused, and economic loss and casualties which are difficult to recover are caused.
In order to realize the repair of concrete, the current microbial crack self-repair application is wider, and microbes form organic and inorganic compounds with lower solubility to fill a permeable porous medium by utilizing biological action, so that the aims of reducing the permeability and repairing cracks are fulfilled. The microorganisms used for self-repair mainly comprise anaerobic microorganisms and aerobic microorganisms. The anaerobic microorganisms metabolize in a humid environment to generate urease, then hydrolyze the urease into ammonia gas and carbon dioxide, and the carbon dioxide reacts with calcium ions dissolved in gaps in the concrete to generate calcium carbonate precipitates.
At present, microorganisms and culture media are generally added into a cement-based material directly when a microorganism self-repairing experiment is carried out, or the microorganisms are prepared into capsules and added into the cement-based material, for example, a composite capsule underground structure concrete self-repairing system with aerobic microorganisms built in is disclosed in CN103043937, and the repairing can be carried out, but the width of repaired cracks is limited.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the anaerobic bacterium self-healing crack concrete which can realize a good and long-time repair function on a wider crack and has very good strength.
The specific technical scheme of the invention is as follows:
the invention provides anaerobic bacterium self-healing crack concrete which mainly comprises the following components in parts by weight:
portland cement 60-80 aggregate 20-35 mineral powder 16-32
Modified cellulose fiber 9-15 anaerobic bacteria compound 12-25 water 40-50.
In a further improvement, the modified cellulose fiber comprises the following components in parts by weight:
cellulose fiber 6-8 polyethylene glycol 4001-3
2, 3-epoxypropyltrimethylammonium chloride 2-4.
In a further improvement, the anaerobic bacteria compound comprises the following components in parts by weight:
2-5 culture medium of anaerobic bacteria 2-5 polyacrylamide 1-3
Hydroxyethyl-beta-cyclodextrin 7-12.
In a further improvement, the modified cellulose fiber is prepared by the following method: placing cellulose fiber in a container, adding 7.5g/mL sodium ethoxide water solution with weight ratio of 1:1.2, heating to 65-70 deg.C, adding polyethylene glycol 400 under stirring, reacting for 20-25min at stirring rate of 1500 r.min-1Then adding 15g/mL sodium ethoxide aqueous solution, keeping the temperature at 65-70 ℃, adding 2, 3-epoxypropyltrimethylammonium chloride while stirring, reacting for 20-25min at the stirring speed of 2500 r/min-1Removing the sodium ethoxide aqueous solution and drying to obtain modified cellulose fibers, wherein the weight ratio of the sodium ethoxide aqueous solution to the cellulose fibers is 1: 1.2; preferably, the anaerobic bacteria compound is prepared by the following method: the preparation method comprises the steps of putting polyacrylamide, anaerobic bacteria and a culture medium into 1.2 times of water by weight, emulsifying under a shearing machine to prepare an emulsion, adding hydroxyethyl-beta-cyclodextrin into 2-5 times of water by weight, fully grinding into paste, adding the emulsion into the paste under stirring, uniformly mixing, and freeze-drying to prepare the anaerobic bacteria compound.
The invention adopts the mixture of mineral powder, modified cellulose fiber and anaerobic bacteria compound as the anti-cracking activity reinforcing agent, thereby obviously improving the self-repairing capability and repairing time of the concrete.
In a further improvement, the mineral powder is composed of the following components in parts by weight.
5-10 parts of bentonite and 3-7 parts of fly ash
7-12 parts of polyacrylic resin, 1-3 parts of calcium silicate.
In a further improvement, the aggregate is selected from one or more of silica fume, slag or perlite.
In a further improvement, the selected mineral powder can obviously improve the strength of concrete.
The invention also provides a preparation method of the anaerobic bacterium self-healing crack concrete, which comprises the following steps:
s1: preparing mineral powder;
s2: preparing modified cellulose fibers;
s3: preparing an anaerobic bacteria compound;
s4: uniformly mixing portland cement, aggregate, mineral powder and 1/2 parts by weight of water to prepare a mixture A;
s5: uniformly mixing the anaerobic bacteria compound, the modified cellulose fiber and 1/2 parts by weight of water to obtain a mixture B;
s6: and uniformly mixing the mixture A and the mixture B, stirring and curing to obtain the concrete.
In a further improvement, the preparation method of the mineral powder comprises the following steps:
s11: uniformly dispersing polyacrylic resin and calcium silicate in water at 2100 r.min-1Stirring to prepare a solution;
s12: dispersing bentonite and fly ash in water at 1500-1600 r.min-1Stirring to obtain mixed slurry;
s13: grinding the mixed slurry in a ball mill with dropping solution A while grinding at 4500--1After dripping, continuously grinding for 12h, and spray dryingDrying, sieving, and making into mineral powder.
Further improvement, the preparation method of the modified cellulose fiber comprises the following steps: placing cellulose fiber in a container, adding 7.5g/mL sodium ethoxide water solution with weight ratio of 1:1.2, heating to 65-70 deg.C, adding polyethylene glycol 400 under stirring, reacting for 20-25min at stirring rate of 1500 r.min-1Then adding 15g/mL sodium ethoxide aqueous solution, keeping the weight ratio of the sodium ethoxide aqueous solution to the cellulose fiber at 65-70 ℃, reacting for 20-25min, removing the sodium ethoxide aqueous solution, and drying to obtain the modified cellulose fiber.
Further improved, the preparation method of the anaerobic bacteria compound comprises the following steps: the preparation method comprises the steps of putting polyacrylamide, anaerobic bacteria and a culture medium into 1.2 times of water by weight, emulsifying under a shearing machine to prepare an emulsion, adding hydroxyethyl-beta-cyclodextrin into 2-5 times of water by weight, fully grinding into paste, adding the emulsion into the paste under stirring, uniformly mixing, and freeze-drying to prepare the anaerobic bacteria compound.
The concrete prepared by the method has very good repairing capability and strength.
The mineral powder, the modified cellulose fiber and the anaerobic bacteria compound are mixed and used as the anti-cracking activity reinforcing agent, so that the self-repairing capability and the repairing time of the concrete are obviously improved, and the prepared mixed soil has very good strength and compactness.
Detailed Description
Examples 1 to 14
The embodiments 1 to 14 of the invention respectively provide anaerobic bacterium self-healing crack concrete, and the weight parts of the concrete in each embodiment are shown in tables 1 to 2.
TABLE 1 EXAMPLES 1-6 concrete compositions and amounts
The modified cellulose fiber of example 5 of the present invention was prepared by the following method:placing cellulose fiber in a container, adding 7.5g/mL sodium ethoxide water solution with weight ratio of 1:1.2, heating to 65 deg.C, adding polyethylene glycol 400 under stirring, and reacting for 25min at stirring rate of 1500r min-1Then adding 15g/mL sodium ethoxide aqueous solution, keeping 65 ℃, adding 2, 3-epoxypropyl trimethyl ammonium chloride while stirring, reacting for 25min at the stirring speed of 2500 r.min-1Removing the sodium ethoxide aqueous solution and drying to obtain modified cellulose fibers, wherein the weight ratio of the sodium ethoxide aqueous solution to the cellulose fibers is 1: 1.2; the anaerobic bacteria compound is prepared by the following method: the preparation method comprises the steps of putting polyacrylamide, anaerobic bacteria and a culture medium into 1.2 times of water by weight, emulsifying under a shearing machine to prepare an emulsion, adding hydroxyethyl-beta-cyclodextrin into 2 times of water by weight, fully grinding into paste, adding the emulsion into the paste under stirring, uniformly mixing, and freeze-drying to prepare the anaerobic bacteria compound.
The preparation method of the anaerobic bacterium self-healing crack concrete in the embodiment 6 of the invention comprises the following steps:
s1: preparing mineral powder;
s2: the preparation method of the modified cellulose fiber comprises the following steps: placing cellulose fiber in a container, adding 7.5g/mL sodium ethoxide water solution with weight ratio of 1:1.2, heating to 70 deg.C, adding polyethylene glycol 400 under stirring, and reacting for 20min at stirring rate of 1500r min-1Then adding 15g/mL sodium ethoxide aqueous solution, keeping 70 ℃, adding 2, 3-epoxypropyl trimethyl ammonium chloride while stirring, reacting for 20min at the stirring speed of 2500 r.min-1Removing the sodium ethoxide aqueous solution and drying to obtain modified cellulose fibers, wherein the weight ratio of the sodium ethoxide aqueous solution to the cellulose fibers is 1: 1.2;
s3: the preparation method of the anaerobic bacterium compound comprises the following steps: putting polyacrylamide, anaerobic bacteria and a culture medium into 1.2 times of water by weight, emulsifying under a shearing machine to prepare an emulsion, adding hydroxyethyl-beta-cyclodextrin into 2-5 times of water by weight, fully grinding into paste, adding the emulsion into the paste under stirring, uniformly mixing, and freeze-drying to prepare an anaerobic bacteria compound;
s4: uniformly mixing portland cement, aggregate, mineral powder and 1/2 parts by weight of water to prepare a mixture A;
s5: uniformly mixing the anaerobic bacteria compound, the modified cellulose fiber and 1/2 parts by weight of water to obtain a mixture B;
s6: and uniformly mixing the mixture A and the mixture B, stirring and curing to obtain the concrete.
TABLE 2 examples 7-14 concrete compositions and amounts
The modified cellulose fiber of example 11 of the present invention was prepared by the following method: placing cellulose fiber in a container, adding 7.5g/mL sodium ethoxide water solution with weight ratio of 1:1.2, heating to 70 deg.C, adding polyethylene glycol 400 under stirring, and reacting for 20min at stirring rate of 1500r min-1Then adding 15g/mL sodium ethoxide aqueous solution, keeping 70 ℃, adding 2, 3-epoxypropyl trimethyl ammonium chloride while stirring, reacting for 20min at the stirring speed of 2500 r.min-1Removing the sodium ethoxide aqueous solution and drying to obtain modified cellulose fibers, wherein the weight ratio of the sodium ethoxide aqueous solution to the cellulose fibers is 1: 1.2; the anaerobic bacteria compound is prepared by the following method: the preparation method comprises the steps of putting polyacrylamide, anaerobic bacteria and a culture medium into 1.2 times of water by weight, emulsifying under a shearing machine to prepare an emulsion, adding hydroxyethyl-beta-cyclodextrin into 2 times of water by weight, fully grinding into paste, adding the emulsion into the paste under stirring, uniformly mixing, and freeze-drying to prepare the anaerobic bacteria compound.
The mineral powder of example 12 of the invention was prepared by the following method:
s11: uniformly dispersing polyacrylic resin and calcium silicate in water at 2000 r.min-1Stirring downStirring to obtain a solution;
s12: dispersing bentonite and fly ash in water at 1500 r.min-1Stirring to obtain mixed slurry;
s13: grinding the mixed slurry in a ball mill at a grinding rate of 4500r min while adding dropwise the solution A-1After dripping, continuously grinding for 12h, spray drying, and sieving to obtain mineral powder.
The modified cellulose fiber of example 13 of the present invention was prepared by the following method: placing cellulose fiber in a container, adding 7.5g/mL sodium ethoxide water solution with weight ratio of 1:1.2, heating to 65 deg.C, adding polyethylene glycol 400 under stirring, and reacting for 25min at stirring rate of 1500r min-1Then adding 15g/mL sodium ethoxide aqueous solution, keeping 65 ℃, adding 2, 3-epoxypropyl trimethyl ammonium chloride while stirring, reacting for 25min at the stirring speed of 2500 r.min-1Removing the sodium ethoxide aqueous solution and drying to obtain modified cellulose fibers, wherein the weight ratio of the sodium ethoxide aqueous solution to the cellulose fibers is 1: 1.2; the anaerobic bacteria compound is prepared by the following method: putting polyacrylamide, anaerobic bacteria and a culture medium into 1.2 times of water by weight, emulsifying under a shearing machine to prepare an emulsion, adding hydroxyethyl-beta-cyclodextrin into 2 times of water by weight, fully grinding into paste, adding the emulsion into the paste under stirring, uniformly mixing, and freeze-drying to prepare an anaerobic bacteria compound; the mineral powder is prepared by the following method:
s11: uniformly dispersing polyacrylic resin and calcium silicate in water at 2100 r.min-1Stirring to prepare a solution;
s12: dispersing bentonite and fly ash in water at 1600 r.min-1Stirring to obtain mixed slurry;
s13: grinding the mixed slurry in a ball mill while dropping solution A at 4600r min-1After dripping, continuously grinding for 12h, spray drying, and sieving to obtain mineral powder.
The preparation method of the anaerobic bacterium self-healing crack concrete in the embodiment 14 of the invention comprises the following steps:
s1: preparing mineral powder, specifically comprising:
s11: uniformly dispersing polyacrylic resin and calcium silicate in water at 2050 r.min-1Stirring to prepare a solution;
s12: dispersing bentonite and fly ash in water at 1550 r.min-1Stirring to obtain mixed slurry;
s13: grinding the mixed slurry in a ball mill, dripping the solution A while grinding, wherein the grinding speed is 4550 r.min-1After dripping, continuously grinding for 12h, spray drying, and sieving to obtain mineral powder;
s2: the preparation method of the modified cellulose fiber comprises the following steps: placing cellulose fiber in a container, adding 7.5g/mL sodium ethoxide water solution with weight ratio of 1:1.2, heating to 65 deg.C, adding polyethylene glycol 400 under stirring, and reacting for 25min at stirring rate of 1500r min-1Then adding 15g/mL sodium ethoxide aqueous solution, keeping 65 ℃, adding 2, 3-epoxypropyl trimethyl ammonium chloride while stirring, reacting for 25min at the stirring speed of 2500 r.min-1Removing the sodium ethoxide aqueous solution and drying to obtain modified cellulose fibers, wherein the weight ratio of the sodium ethoxide aqueous solution to the cellulose fibers is 1: 1.2;
s3: the preparation method of the anaerobic bacterium compound comprises the following steps: putting polyacrylamide, anaerobic bacteria and a culture medium into 1.2 times of water by weight, emulsifying under a shearing machine to prepare an emulsion, adding hydroxyethyl-beta-cyclodextrin into 2 times of water by weight, fully grinding into paste, adding the emulsion into the paste under stirring, uniformly mixing, and freeze-drying to prepare an anaerobic bacteria compound;
s4: uniformly mixing portland cement, aggregate, mineral powder and 1/2 parts by weight of water to prepare a mixture A;
s5: uniformly mixing the anaerobic bacteria compound, the modified cellulose fiber and 1/2 parts by weight of water to obtain a mixture B;
s6: and uniformly mixing the mixture A and the mixture B, stirring and curing to obtain the concrete.
Comparative examples 1 to 22
The invention provides anaerobic bacterium self-healing crack concrete in comparison examples, and the parts by weight of the concrete in each comparison example are shown in tables 3-4.
TABLE 3 comparative examples 1-10 concrete compositions and amounts
The modified cellulose and the anaerobic compound were prepared in the same manner as in example 5 in comparative examples 1 to 10.
Comparative example 11
Comparative example 11 provided concrete substantially the same as example 5, except that the modified cellulose fiber was prepared by the following method:
placing cellulose fiber in a container, adding 10g/mL sodium ethoxide water solution with weight ratio of 1:1, heating to 60 deg.C, adding polyethylene glycol 400 under stirring, and reacting for 25min at stirring speed of 1000 r.min-1Then adding 10g/mL sodium ethoxide aqueous solution, keeping 60 ℃, adding 2, 3-epoxypropyl trimethyl ammonium chloride under stirring, reacting for 25min at the stirring speed of 1000 r.min-1And the weight ratio of the sodium ethoxide aqueous solution to the cellulose fiber is 1:1, removing the sodium ethoxide aqueous solution, and drying to obtain the modified cellulose fiber.
Comparative example 12
Comparative example 12 provided concrete substantially the same as example 5, except that the modified cellulose fiber was prepared by the following method:
placing cellulose fiber in a container, adding 15g/mL sodium ethoxide water solution with weight ratio of sodium ethoxide water solution to cellulose fiber of 1:2.4, heating to 65 deg.CAdding polyethylene glycol 400 and 2, 3-epoxypropyltrimethylammonium chloride under stirring, reacting for 50min at the stirring speed of 1500 r.min-1And removing the sodium ethoxide aqueous solution, and drying to obtain the modified cellulose fiber.
Comparative example 13
Comparative example 13 provided concrete substantially the same as example 5, except that the anaerobic composite was prepared by the following method:
uniformly mixing polyacrylamide, anaerobic bacteria, a culture medium and hydroxyethyl-beta-cyclodextrin to obtain the anaerobic bacteria compound.
Comparative example 14
Comparative example 14 provided concrete substantially the same as example 5, except that the anaerobic composite was prepared by the following method:
uniformly mixing polyacrylamide, anaerobic bacteria and a culture medium to obtain a mixture, adding hydroxyethyl-beta-cyclodextrin into 2 times of water by weight, fully grinding the mixture to paste, adding the mixture into the paste while stirring, uniformly mixing, and freeze-drying to obtain the anaerobic bacteria compound.
TABLE 4 COMPARATIVE EXAMPLES 16-20 CONCRETE WITH COMPONENTS AND USE
- -means no such ingredient. Comparative examples 15 to 19 modified cellulose, anaerobic composite and mineral powder were prepared in the same manner as in example 13.
Comparative example 20
Comparative example 20 provided a concrete substantially the same as that of example 13, except that the mineral powder was prepared by the following method:
s11: dispersing polyacrylic resin and calcium silicate uniformly in water at 1500 r.min-1Stirring to prepare a solution;
s12: dispersing bentonite and fly ash in water at 1400 r.min-1Stirring to obtain mixed slurry;
s13: mixing the raw materialsGrinding the slurry in a ball mill at a grinding rate of 4200 r/min while adding dropwise solution A-1After dripping, continuously grinding for 12h, spray drying, and sieving to obtain mineral powder.
Comparative example 21
Comparative example 21 provided a concrete substantially the same as example 13, except that the mineral powder was prepared by the following method:
s11: uniformly dispersing polyacrylic resin and calcium silicate in water at 2500r min-1Stirring to prepare a solution;
s12: dispersing bentonite and fly ash in water at 1700 r.min-1Stirring to obtain mixed slurry;
s13: grinding the mixed slurry in a ball mill at a grinding rate of 4700r min while adding dropwise solution A-1After dripping, continuously grinding for 12h, spray drying, and sieving to obtain mineral powder.
Comparative example 22
Comparative example 22 provided a concrete substantially the same as example 13, except that the mineral powder was prepared by the following method:
s11: and uniformly mixing the polyacrylic resin, the calcium silicate, the bentonite and the fly ash to obtain mineral powder.
Testing of concrete Properties
The concrete of each example and comparative example was subjected to a self-repairing test (prepressing with test pieces) and a strength test, and the test results are shown in table 5. The elastic recovery rate is the ratio of the second flexural strength to the first flexural strength.
Table 5 concrete performance test results of each example and comparative example
As can be seen from the table, the concrete provided by the present invention has very good repairing performance and very good hardness and compactness, and thus it is concluded that the mixing of the anaerobic compound, the modified cellulose fiber and the mineral powder can significantly improve the repairing performance of the concrete and make the prepared concrete have very good strength and compactness, and when the ingredients or preparation method thereof are changed, the repairing performance and strength of the concrete are significantly reduced.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as those of the present application, fall within the protection scope of the present invention.
Claims (5)
1. The anaerobic bacterium self-healing crack concrete is characterized by comprising the following components in parts by weight:
60-80 parts of Portland cement, 20-35 parts of aggregate, 16-32 parts of mineral powder,
9-15 parts of modified cellulose fiber, 12-25 parts of anaerobic bacteria compound and 40-50 parts of water;
the anaerobic bacteria compound comprises the following components in parts by weight:
2-5 parts of anaerobic bacteria, 2-5 parts of culture medium, 1-3 parts of polyacrylamide,
7-12 parts of hydroxyethyl-beta-cyclodextrin;
the modified cellulose fiber comprises the following components in parts by weight:
6-8 parts of cellulose fiber, 4001-3 parts of polyethylene glycol,
2-4 parts of 2, 3-epoxypropyltrimethylammonium chloride;
the modified cellulose fiber is prepared by the following method: placing cellulose fiber in a container, adding 7.5g/mL sodium ethoxide water solution with weight ratio of 1:1.2, heating to 65-70 deg.C, adding polyethylene glycol 400 under stirring, reacting for 20-25min at stirring rate of 1500 r.min-1Then adding 15g/mL sodium ethoxide aqueous solution, and keeping the temperature at 65-70 DEG CAdding 2, 3-epoxypropyltrimethylammonium chloride while stirring, reacting for 20-25min at the stirring speed of 2500 r.min-1Removing the sodium ethoxide aqueous solution and drying to obtain modified cellulose fibers, wherein the weight ratio of the sodium ethoxide aqueous solution to the cellulose fibers is 1: 1.2;
the anaerobic bacterium compound is prepared by the following method: the preparation method comprises the steps of putting polyacrylamide, anaerobic bacteria and a culture medium into 1.2 times of water by weight, emulsifying under a shearing machine to prepare an emulsion, adding hydroxyethyl-beta-cyclodextrin into 2-5 times of water by weight, fully grinding into paste, adding the emulsion into the paste under stirring, uniformly mixing, and freeze-drying to prepare the anaerobic bacteria compound.
2. The anaerobic self-healing crack concrete according to claim 1, wherein the mineral powder comprises the following components in parts by weight:
5-10 parts of bentonite, 3-7 parts of fly ash,
7-12 parts of polyacrylic resin and 1-3 parts of calcium silicate.
3. The anaerobic self-healing crack concrete according to claim 1, wherein the aggregate is selected from one or more of slag, silica fume or perlite.
4. The preparation method of the anaerobic bacterium self-healing crack concrete according to claim 1, wherein the preparation method comprises the following steps:
s1: preparing mineral powder;
s2: preparing modified cellulose fibers; placing cellulose fiber in a container, adding 7.5g/mL sodium ethoxide water solution with weight ratio of 1:1.2, heating to 65-70 deg.C, adding polyethylene glycol 400 under stirring, reacting for 20-25min at stirring rate of 1500 r.min-1Then adding 15g/mL sodium ethoxide aqueous solution, wherein the weight ratio of the sodium ethoxide aqueous solution to the cellulose fiber is 1:1.2, continuously keeping the temperature at 65-70 ℃, reacting for 20-25min, removing the sodium ethoxide aqueous solution, and drying to obtain the modified fiberCellulose fibers;
s3: preparing an anaerobic bacteria compound; putting polyacrylamide, anaerobic bacteria and a culture medium into 1.2 times of water by weight, emulsifying under a shearing machine to prepare an emulsion, adding hydroxyethyl-beta-cyclodextrin into 2-5 times of water by weight, fully grinding into paste, adding the emulsion into the paste under stirring, uniformly mixing, and freeze-drying to prepare an anaerobic bacteria compound;
s4: uniformly mixing portland cement, aggregate, mineral powder and 1/2 parts by weight of water to prepare a mixture A;
s5: uniformly mixing the anaerobic bacteria compound, the modified cellulose fiber and 1/2 parts by weight of water to obtain a mixture B;
s6: and uniformly mixing the mixture A and the mixture B, stirring and curing to obtain the concrete.
5. The method of claim 4, wherein the mineral powder is prepared by:
s11: uniformly dispersing polyacrylic resin and calcium silicate in water at 2100 r.min-1Stirring to prepare a solution;
s12: dispersing bentonite and fly ash in water at 1500-1600 r.min-1Stirring to obtain mixed slurry;
s13: grinding the mixed slurry in a ball mill with dropping solution A while grinding at a grinding rate of 4500--1After dripping, continuously grinding for 12h, spray drying, and sieving to obtain mineral powder.
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| CN103043937B (en) * | 2012-12-27 | 2015-12-23 | 同济大学 | The complex capsule underground structure concrete self-repairing system of a kind of built-in aerobic microorganism |
| NL2013203B1 (en) * | 2014-07-17 | 2016-05-19 | Univ Delft Tech | Process for the production of cementious material. |
| CN106608919A (en) * | 2015-10-23 | 2017-05-03 | 金东纸业（江苏）股份有限公司 | Preparation method of cationic starch |
| CN106082767B (en) * | 2016-06-06 | 2018-01-09 | 重庆三峡学院 | A kind of string loads the self-repairing cement-base material of microorganism |
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