CN114873958A - Crack self-repairing concrete suitable for sewage treatment tank and preparation method thereof - Google Patents
Crack self-repairing concrete suitable for sewage treatment tank and preparation method thereof Download PDFInfo
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- CN114873958A CN114873958A CN202210635392.3A CN202210635392A CN114873958A CN 114873958 A CN114873958 A CN 114873958A CN 202210635392 A CN202210635392 A CN 202210635392A CN 114873958 A CN114873958 A CN 114873958A
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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
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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
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/107—Acids or salts thereof
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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
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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
- C12N1/36—Adaptation or attenuation of cells
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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
- C12N1/38—Chemical stimulation of growth or activity by addition of chemical compounds which are not essential growth factors; Stimulation of growth by removal of a chemical compound
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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
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses crack self-repairing concrete suitable for a sewage treatment tank and a preparation method thereof, relating to the technical field of preparation of adsorption materials and comprising the following components in parts by mass: 1180-1320 parts of enhanced recycled coarse aggregate, 145-235 parts of recycled fine aggregate, 300-340 parts of cement, 520-610 parts of sand, 110-125 parts of fly ash and 170-200 parts of water, wherein 20-30% of the recycled fine aggregate is loaded with nutrient substances. The invention comprises the following steps: preparing sludge mixed liquor; preparing a trace element solution; preparing a selective culture medium; acclimating aerobic characteristics; domesticating anaerobic characteristics; passage enrichment; preparing a strain; reinforcing the recycled coarse aggregate; preparing recycled fine aggregate; and preparing the self-repairing concrete. The self-repairing concrete for the sewage treatment tank is reasonable in design, can perform self-repairing in a severe environment of the sewage treatment tank, meets certain mechanical property and impermeability, reduces economic cost, realizes sustainable development, and has great practical significance and application value.
Description
Technical Field
The invention relates to the technical field of concrete materials, in particular to the technical field of crack self-repairing concrete materials, and specifically relates to crack self-repairing concrete suitable for a sewage treatment tank and a preparation method thereof.
Background
With the rapid development of economy, the growth of population and other factors, the quantity of industrial wastewater and domestic sewage is increasing year by year, which leads to the increasingly serious urban environmental pollution problem. In order to protect the environment and promote the sustainable development of urban economy, the construction of urban sewage treatment plants is gradually being developed.
Under the environment of urban sewage, the sewage treatment tank is generally in a buried, semi-buried closed, semi-closed or open outdoor form, is acted by factors such as flowing abrasion and scouring of chemicals such as acid and alkali, industrial sewage, industrial atmosphere, ultraviolet rays and solid particles for a long time, has various complex corrosion forms such as acid-base corrosion, atmospheric corrosion, abrasion and osmotic bursting physical erosion, microbial corrosion of bacteria and algae and the like, and can also generate physical destruction of bursting and infiltration, thereby forming serious corrosion. The concrete of the sewage treatment tank is corroded by various acids, alkalis, organic matters, inorganic matters and microorganisms, and in addition, the corrosion mechanism of the concrete is extremely complex under the actions of mechanical impact, abrasion and climatic factors.
From various research studies at home and abroad, various concrete structures of sewage treatment plants have corrosion phenomena with different degrees, so that the longest service time of the structures is not more than 20 years, and even part of facilities are seriously deteriorated after being used for less than ten years. Obviously, the existing concrete design methods are not suitable for sewage treatment facilities.
The metabolic processes of microorganisms can be divided into aerobic metabolism and anaerobic metabolism, wherein the aerobic metabolism mainly occurs at the surface layer of the water surface of the sewage treatment tank, and the anaerobic metabolism mainly occurs at the underwater part, so far, evidence has proved that the manifestation of bacteria of the genus thiobacillus is a main factor causing concrete aging under sewage conditions. Their metabolic products form sulfuric acid, attack the concrete's biological matrix, causing a loss of strength and cohesion, whereas thiobacilli are only part of a widespread and complex corrosion process. Sulfuric acid has been identified as a caustic agent not only in the corrosion of sewers, but also in corrosion of sewage treatment plants. These threat factors, coupled with the low tensile strength of concrete, increase the likelihood of cracking of the concrete, and the increased permeability of the concrete due to cracking exposes the reinforcing steel to contaminated water, which can result in carbonization, a decrease in the ph, and ultimately, a retardation of the passivation of the reinforcing steel.
The passive repairing method for the concrete cracks mainly comprises epoxy resin reinforced grouting, gravity filling or epoxy injection by using a cementing material and the like. However, these methods have high maintenance cost and complicated treatment procedures, are not suitable for large-area popularization and use, and cannot meet the requirements of actual work. At present, most of scholars at home and abroad adopt pure bacteria as a microorganism self-repairing agent, the preparation cost of the pure bacteria is high, and the microorganism repairing cost is invisibly increased.
Therefore, a series of problems that various concrete structures of the existing sewage treatment plant are seriously corroded, the service life is short, concrete is seriously aged under water conditions, the existing repairing method is high in maintenance cost and complex in treatment process, is not suitable for popularization, cannot meet actual work and the like need to be researched and solved.
Disclosure of Invention
The invention provides crack self-repairing concrete suitable for a sewage treatment tank and a preparation method thereof, aiming at solving a series of problems that the crack self-repairing protection of microorganisms in the sewage treatment tank is influenced by a high-alkali environment, the self-repairing is slow under the severe and harsh condition of the sewage treatment tank, the repairing method for the sewage treatment tank is high in maintenance cost, complex in treatment process, unsuitable for popularization, incapable of meeting the actual work and the like.
The invention is realized by adopting the following technology:
the invention provides crack self-repairing concrete suitable for a sewage treatment tank, which comprises the following components in parts by weight: 1180-1320 parts of recycled coarse aggregate which is reinforced for 5-7 days and has the particle size of 4.75-26.5 mm, 145-235 parts of recycled fine aggregate with the particle size of 2.36-4.75 mm, 300-340 parts of cement, 520-610 parts of sand, 110-125 parts of fly ash and 170-200 parts of water, wherein mixed bacteria suspension, lactic acid and calcium nitrate are adsorbed on the recycled coarse aggregate, 20-30% of the recycled fine aggregate is loaded with nutrient substances, and the nutrient substances are mixed solution of lactic acid and calcium nitrate, wherein the concentration of the lactic acid is 55-65 g/L, and the concentration of the calcium nitrate is 55-65 g/L.
The concrete preparation process of the crack self-repairing concrete suitable for the sewage treatment tank comprises the following steps: the method comprises the following steps:
a, preparing sludge mixed liquor
Active sludge and garden soil of a sewage treatment plant are taken and sieved to remove impurities contained in the active sludge and garden soil, and the mass ratio of the active sludge to the garden soil is 1:1, uniformly mixing to prepare a sludge mixed solution;
b, preparing a trace element solution
Adding 0.2g of vitamin H, 0.2g of folic acid (vitamin B9), 1g of vitamin B6, 0.5g of vitamin B2, 0.5g of vitamin B1, 0.5g of nicotinic acid (vitamin B3), 0.5g of vitamin B5, 0.01g of vitamin B12, 0.5g of p-aminobenzoic acid and 0.5g of lipoic acid into per liter of distilled water, preparing for later use, and diluting by 100 times when in use;
c, preparing a selection medium
Adding 0.85g of sodium lactate (calculated by 60%) and 0.02g of ammonium chloride into 1L of sewage, and 10mL of the trace element solution prepared in step b to prepare a liquid selective medium; wherein the sewage is selected from sewage treatment plants;
d, acclimatization of aerobic characteristics
Taking sludge mixed liquor and selective culture medium in a volume ratio of 1:10, and adding Na 3 PO 4 Adjusting the pH value to 11, covering a film, sealing, carrying out constant-temperature shaking culture at 33 ℃ for 2d, collecting the supernatant, taking the sludge mixed solution at the bottom, and preparing the sludge mixed solution subjected to primary aerobic characteristic domestication;
e, acclimatization of anaerobic characteristics
Taking the sludge mixed solution which is prepared in the step d and has undergone primary aerobic characteristic acclimation and the selective culture medium according to the volume ratio of 1:10, and adding Na 3 PO 4 Adjusting pH to 11, introducing nitrogen to remove oxygen for 15min, sealing, culturing at constant temperature under shaking for 2d, collecting supernatant, collecting bottom sludge mixed solution, and performing primary anaerobic characteristic acclimationThe sludge mixed solution of (1); in order to enable the screened mixed bacteria to resist the severe environment of a sewage treatment tank and form spores, sewage is adopted for culture and domestication;
f, passage enrichment
D, circularly carrying out passage enrichment on the steps d and e, and taking bottom bacterium liquid after continuously culturing for ten cycles; the structure of the sewage treatment pool is damaged on the surface layer of the water surface and under the water, and the gas-liquid interface flushed by sewage is most serious according to different damage degrees of the concrete caused by corrosion of the sewage in the prior research, so that facultative aerobic mixed bacteria are adopted;
g, preparing strains
Centrifuging the bottom bacterium liquid obtained in the step f for 20min at the speed of 4000r/min, taking bacterium mud, re-suspending the bacterium mud in sterile distilled water, and diluting the bacterium mud until the concentration of the bacterium is 5.5-6.0 multiplied by 10 6 cfu/mL to obtain mixed bacteria suspension;
h, reinforcing recycled coarse aggregate
Adsorbing the mixed bacteria suspension prepared in the step g to the surface and inner pores of the recycled aggregate by using an internal and external pressure difference through a vacuum adsorption method, drying at 45 +/-2 ℃ through a drying box, spraying a mixed solution of lactic acid and calcium nitrate on the surface of the recycled aggregate particles adsorbing facultative aerobic mixed bacteria at regular time, continuously spraying and enhancing for 5-7 days, and performing secondary drying at the same temperature to prepare reinforced recycled coarse aggregate with the particle size of 4.75-26.5 mm; because the sewage treatment tank has certain water pressure and is easy to generate permeability bursting, the sewage treatment tank has certain requirements on strength and impermeability, and the regenerated coarse aggregate which is reinforced for 5-7 days is adopted as a carrier to immobilize microorganisms;
i, preparing recycled fine aggregate loaded with nutrient substances
Adsorbing the mixed solution of lactic acid and calcium nitrate onto the surface and the inner pores of the recycled fine aggregate by using an internal and external pressure difference by adopting a vacuum adsorption method to prepare the recycled fine aggregate with the particle size of 2.36-4.75 mm; wherein the concentration of the lactic acid is 55-65 g/L, and the concentration of the calcium nitrate is 55-65 g/L. Because a part of available nutrients exist in the sewage, 20-30% of the regenerated fine aggregate is used for immobilizing the nutrients, and the rest of the regenerated fine aggregate is not used for immobilizing the nutrients, and a small water-cement ratio is adopted, so that the mechanical property of the concrete is ensured, and the cost for inputting the nutrients is saved;
j, preparing self-repairing concrete
Putting 40% of the enhanced recycled coarse aggregate 1180-1320 parts, the recycled fine aggregate 145-235 parts, the sand 520-610 parts and the water 170-220 parts which are prepared in the step h into a stirrer, and stirring for 30 s; adding 300-340 parts of cement, 110-125 parts of fly ash and the rest water into a stirrer and stirring for 3-4 min; and f, adding the nutrient substances to the recycled fine aggregate in the step i, wherein 20-30% of 145-235 parts of the recycled fine aggregate is the recycled fine aggregate loaded with the nutrient substances prepared in the step i. After the fly ash is doped into the concrete, the stress corrosion, the strength loss, the expansion rate and the steel bar rust resistance are obviously improved under the load action of artificial sewage, so the fly ash is added into the concrete to improve the performance of the concrete.
Compared with the prior art, the invention has the following beneficial effects: according to the crack self-repairing concrete suitable for the sewage treatment tank and the preparation method thereof, sewage is adopted for culture and domestication, the cultured microorganisms can survive under the severe condition of the sewage treatment tank and can be self-repaired by using organic matters and nutrient substances in the sewage, and only 20% -30% of regenerated fine aggregate is replaced to carry the nutrient substances, so that the mechanical property of the concrete is ensured, the cost for inputting the nutrient substances is saved, the crack self-repairing can be carried out under the severe and severe environment of the sewage treatment tank, and the sufficient mechanical property and the sufficient seepage-proofing property can be met. The carrier used is the recycled aggregate which is reinforced for 5-7 days, namely, the pores on the surface of the recycled aggregate are utilized to provide attachment points for mixed bacteria, and the carriers are enhanced by mineralization treatment to provide better environmental protection for microorganisms, so that the mechanical property and the working property of recycled concrete are improved. The durability of a concrete structure is prolonged, the maintenance cost of the sewage treatment tank is reduced, the environment can be protected due to the construction of the sewage treatment tank, and the sustainable development of economy is promoted. The self-repairing concrete prepared by using the recycled aggregate as the carrier can solve the problem of natural sandstone resource shortage, effectively solve the problems of building waste stacking and pollution, realize the resource utilization of the building waste and have practical significance. The microorganisms adopted by the invention are facultative aerobic mixed bacteria, and aerobic metabolism can be carried out when the oxygen is sufficient, namely the surface layer of the water surface; under the anoxic environment, namely the underwater structure can carry out anaerobic metabolism, the mixed bacteria has more excellent mineralization deposition performance than the pure bacteria, compared with the pure bacteria, the mixed bacteria has more excellent mineralization deposition performance, the preparation cost of the strain is obviously reduced, and the characteristics of the strain are more consistent with the requirements of the actual concrete structure on the microbial repairing agent. The sewage can be used for culturing mixed bacteria, and can be self-healed by using nutrient substances and matrixes in the concrete when contacting the concrete. Tests prove that the test method provided by the invention has the self-repairing widths of 0.65mm, 0.74mm and 0.83mm respectively through a 28-day underwater repairing and maintaining crack test, and can keep a high complete crack repairing rate. The self-repairing concrete for the sewage treatment tank is reasonable in design, can perform self-repairing in a severe environment of the sewage treatment tank, meets certain mechanical property and impermeability, reduces economic cost, realizes sustainable development, and has great practical significance and application value.
Drawings
FIG. 1 is an appearance diagram of a repair and maintenance crack in water in example 1, wherein a is repair and maintenance 14d before maintenance, b is repair and maintenance 28 d.
FIG. 2 is an apparent view of the underwater repair and maintenance cracks of example 2, wherein a represents repair and maintenance 14d before maintenance, b represents repair and maintenance 28 d.
FIG. 3 is an apparent view of the underwater repairing and curing crack of example 3, wherein a represents repairing and curing 14d before curing, b represents repairing and curing 28 d.
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
Example 1
The crack self-repairing concrete suitable for the sewage treatment tank comprises the following components in parts by mass: the paint comprises the following components in parts by weight: 1180 parts of recycled coarse aggregate with the particle size of 4.75-26.5 mm, 145 parts of recycled fine aggregate with the particle size of 2.36-4.75 mm, 300 parts of cement, 575 parts of sand, 110 parts of fly ash and 170 parts of water, wherein mixed bacteria suspension, lactic acid and calcium nitrate are adsorbed on the recycled coarse aggregate, 20-30% of the recycled fine aggregate is loaded with nutrient substances, and the nutrient substances are mixed solution of lactic acid and calcium nitrate, wherein the concentration of the lactic acid and the calcium nitrate is 55 g/L.
The preparation method of the crack self-repairing concrete suitable for the sewage treatment tank comprises the following specific steps:
a, preparing sludge mixed liquor
Active sludge and garden soil of a sewage treatment plant are taken and sieved to remove impurities contained in the active sludge and garden soil, and the mass ratio of the active sludge to the garden soil is 1:1, uniformly mixing to prepare a sludge mixed solution;
b, preparing a trace element solution
Adding 0.2g of vitamin H, 0.2g of folic acid, 1g of vitamin B6, 0.5g of vitamin B2, 0.5g of vitamin B1, 0.5g of nicotinic acid, 0.5g of vitamin B5, 0.01g of vitamin B12, 0.5g of p-aminobenzoic acid and 0.5g of lipoic acid into per liter of distilled water, and diluting by 100 times when the vitamin H, the folic acid, the nicotinic acid, the vitamin B and the lipoic acid are used for preparation and standby;
c, preparing a selection medium
Adding 0.85g of sodium lactate (calculated by 60%) and 0.02g of ammonium chloride into 1L of sewage, and 10mL of the trace element solution prepared in step b to prepare a liquid selective medium;
d, acclimatization of aerobic characteristics
10mL of the sludge mixture and 100mL of the selection medium were added to a 150mL Erlenmeyer flask and Na was added 3 PO 4 Adjusting pH to 11 to cover the bottle mouth with a high-temperature-resistant tissue culture sealing film, culturing at 33 ℃ in a constant-temperature oscillation incubator for 2d, taking sludge mixed solution at the bottom from the supernatant of the culture enclosure, and preparing sludge mixed solution subjected to primary aerobic characteristic domestication;
e, acclimatization of anaerobic characteristics
Taking 10mL of the sludge mixed solution which is subjected to primary aerobic characteristic domestication and prepared in the step d, adding 100mL of selective culture medium, and adding Na 3 PO 4 Adjusting the pH value to 11, introducing nitrogen to remove oxygen for 15min, covering a sealing film and sealing, culturing for 2d in a constant-temperature oscillation incubator, taking a sludge mixed solution at the bottom from a supernatant of the incubator, and preparing the sludge mixed solution subjected to primary anaerobic characteristic acclimation;
f, passage enrichment
D, circulating the steps d and e for passage enrichment, circulating ten times of acclimation with aerobic-anaerobic characteristics, and continuously culturing for ten cycles, and then taking bottom bacterium liquid of a bottle;
g, preparing strains
Centrifuging the bottom bacterium liquid obtained in the step f for 20min at the speed of 4000r/min, taking bacterium mud, re-suspending the bacterium mud in sterile distilled water, and diluting the bacterium mud until the concentration of the bacterium is 5.5-6.0 multiplied by 10 6 cfu/mL to obtain mixed bacteria suspension;
h, reinforcing recycled coarse aggregate
Adsorbing the mixed bacteria suspension prepared in the step g to the surface and inner pores of the recycled aggregate by using an internal and external pressure difference through a vacuum adsorption method, drying the mixed bacteria suspension at the temperature of 45 +/-2 ℃ through a drying box, regularly spraying a mixed solution of lactic acid and calcium nitrate on the surface of the recycled aggregate particles adsorbing facultative aerobic mixed bacteria, continuously spraying and enhancing the lactic acid and calcium nitrate for 5-7 days, and performing secondary drying at the same temperature to prepare an enhanced recycled coarse aggregate with the particle size of 4.75-26.5 mm;
i, preparing recycled fine aggregate loaded with nutrient substances
Adsorbing the mixed solution of lactic acid and calcium nitrate onto the surface and the inner pores of the recycled fine aggregate by using an internal and external pressure difference by adopting a vacuum adsorption method to prepare the recycled fine aggregate with the particle size of 2.36-4.75 mm; wherein the concentration of the lactic acid and the concentration of the calcium nitrate are both 55 g/L; because part of available nutrients exist in the sewage, 20-30% of the regenerated fine aggregate is used for immobilizing the nutrients, and the rest of the regenerated fine aggregate is not used for immobilizing the nutrients;
j, preparing self-repairing concrete
Putting 1180 parts of the enhanced recycled coarse aggregate prepared in the step h, 145 parts of the recycled fine aggregate, 575 parts of sand and 40% of 170 parts of water (namely 68 parts of water) into a stirrer, and stirring for 30 s; adding 300 parts of cement, 110 parts of fly ash and the rest 102 parts of water into a stirrer and stirring for 3-4 min; and f, wherein 20-30% of 145 parts of the recycled fine aggregate is the recycled fine aggregate loaded with the nutrient substances prepared in the step i.
The crack self-repairing effect is tested, as shown in fig. 1, the width of the crack to be repaired in water is 0.65mm before maintenance, after the repair is carried out, the crack to be repaired in water is basically repaired at 14 days, and the crack to be repaired in water is repaired at 28 days.
Example 2
The crack self-repairing concrete suitable for the sewage treatment tank comprises the following components in parts by mass: the paint comprises the following components in parts by weight: 1230 parts of recycled coarse aggregate which is reinforced for 5 days and has the particle size of 4.75-26.5 mm, 220 parts of recycled fine aggregate with the particle size of 2.36-4.75 mm, 315 parts of cement, 520 parts of sand, 115 parts of fly ash and 180 parts of water, wherein mixed bacteria suspension, lactic acid and calcium nitrate are adsorbed on the recycled coarse aggregate, 20-30% of the recycled fine aggregate is loaded with nutrient substances, and the nutrient substances are mixed solution of lactic acid and calcium nitrate, wherein the concentration of the lactic acid and the calcium nitrate is 55 g/L.
The procedure is as in example 1 except for the addition of components in step j.
The crack self-repairing effect is tested, as shown in fig. 2, the width of the crack to be repaired in water is 0.74mm before maintenance, after the repair is carried out, the crack to be repaired in water is basically repaired at 14d, and the crack to be repaired in water is repaired at 28 d.
Example 3
The crack self-repairing concrete suitable for the sewage treatment tank comprises the following components in parts by mass: the paint comprises the following components in parts by weight: 1280 parts of 7 d-reinforced recycled coarse aggregate with the particle size of 4.75-26.5 mm, 150 parts of recycled fine aggregate with the particle size of 2.36-4.75 mm, 330 parts of cement, 610 parts of sand, 120 parts of fly ash and 190 parts of water, wherein mixed bacteria suspension, lactic acid and calcium nitrate are adsorbed on the recycled coarse aggregate, 20-30% of the recycled fine aggregate carries nutrient substances, and the concentration of the nutrient substances is 65g/L of mixed solution of lactic acid and calcium nitrate.
The concentrations of lactic acid and calcium nitrate in the nutrients in steps h and i were 65g/L, and the additive components in step j were prepared according to the above-mentioned components, in the same manner as in example 1.
The crack self-repairing effect is tested, as shown in fig. 3, the width of the crack to be repaired in water is 0.83mm before maintenance, after the repair is carried out, a gap still exists in the crack to be repaired in water at 14 days, and the crack to be repaired in water is repaired at 28 days.
Example 4
The crack self-repairing concrete suitable for the sewage treatment tank comprises the following components in parts by mass: the paint comprises the following components in parts by weight: 1320 parts of recycled coarse aggregate which is 7 days old and has the grain diameter of 4.75-26.5 mm, 235 parts of recycled fine aggregate with the grain diameter of 2.36-4.75 mm, 340 parts of cement, 545 parts of sand, 125 parts of fly ash and 200 parts of water, wherein mixed bacteria suspension, lactic acid and calcium nitrate are adsorbed on the recycled coarse aggregate, 20-30% of the recycled fine aggregate carries nutrient substances, and the nutrient substances are mixed solution of lactic acid and calcium nitrate, wherein the concentration of the lactic acid and the calcium nitrate is 65 g/L.
The procedure is as in example 3 except for the addition of components in step j.
The scope of the invention is not limited to the above embodiments, and various modifications and changes may be made by those skilled in the art, and any modifications, improvements and equivalents within the spirit and principle of the invention should be included in the scope of the invention.
Claims (9)
1. The utility model provides a crack selfreparing concrete suitable for sewage treatment pond which characterized in that: the paint comprises the following components in parts by weight: 1180-1320 parts of recycled coarse aggregate with the particle size of 4.75-26.5 mm, 145-235 parts of recycled fine aggregate with the particle size of 2.36-4.75 mm, 300-340 parts of cement, 520-610 parts of sand, 110-125 parts of fly ash and 170-200 parts of water, wherein 20-30% of the recycled fine aggregate is loaded with nutrient substances.
2. The crack self-repairing concrete suitable for the sewage treatment tank is characterized in that: the nutrient substance is a mixed solution of lactic acid and calcium nitrate, wherein the concentration of the lactic acid is 55-65 g/L, and the concentration of the calcium nitrate is 55-65 g/L.
3. The crack self-repairing concrete suitable for the sewage treatment tank is characterized in that: the recycled coarse aggregate is adsorbed with mixed bacteria suspension, lactic acid and calcium nitrate.
4. A preparation method of crack self-repairing concrete suitable for a sewage treatment tank is characterized by comprising the following steps: the method comprises the following steps:
a, preparing sludge mixed liquor
Taking activated sludge and garden soil of a sewage treatment plant, sieving, and mixing according to a mass ratio of 1:1, uniformly mixing to prepare a sludge mixed solution;
b, preparing a trace element solution
Adding 0.2g of vitamin H, 0.2g of folic acid, 1g of vitamin B6, 0.5g of vitamin B2, 0.5g of vitamin B1, 0.5g of nicotinic acid, 0.5g of vitamin B5, 0.01g of vitamin B12, 0.5g of p-aminobenzoic acid and 0.5g of lipoic acid into per liter of distilled water, and diluting by 100 times when the vitamin H, the folic acid, the nicotinic acid, the vitamin B and the lipoic acid are used for preparation and standby;
c, preparing a selection medium
Adding 0.85g of sodium lactate, 0.02g of ammonium chloride and 10mL of the trace element solution prepared in the step b into every 1L of sewage to prepare a selective culture medium;
d, acclimatization of aerobic characteristics
Taking sludge mixed liquor and selective culture medium in a volume ratio of 1:10, and adding Na 3 PO 4 Adjusting the pH value to 11, covering a film, sealing, carrying out constant-temperature oscillation culture for 2d, collecting the bottom sludge mixed solution from the supernatant, and preparing the sludge mixed solution subjected to primary aerobic characteristic domestication;
e, acclimatization of anaerobic characteristics
Taking the sludge mixed solution which is prepared in the step d and has undergone primary aerobic characteristic acclimation and the selective culture medium according to the volume ratio of 1:10, and adding Na 3 PO 4 Adjusting the pH value to 11, filling nitrogen to remove oxygen for 15min, sealing, carrying out constant-temperature shaking culture for 2d, collecting the supernatant, taking the sludge mixed solution at the bottom, and preparing the sludge mixed solution subjected to primary anaerobic characteristic acclimation;
f, passage enrichment
D, circularly carrying out passage enrichment on the steps d and e, and taking bottom bacterium liquid after continuously culturing for ten cycles;
g, preparing strains
Centrifuging the bottom bacterium liquid obtained in the step f, taking bacterium mud, re-suspending the bacterium mud in sterile distilled water, and diluting until the concentration of the bacterium is 5.5-6.0 multiplied by 10 6 cfu/mL to obtain mixed bacteria suspension;
h, reinforcing recycled coarse aggregate
Adsorbing the mixed bacteria suspension prepared in the step g to the surface and the inner pores of the recycled aggregate by using an internal and external pressure difference through a vacuum adsorption method, drying, spraying nutrient substances on the surface of the recycled aggregate particles adsorbing facultative aerobic mixed bacteria at regular time, continuously spraying and enhancing for 5-7 days, and performing secondary drying to prepare enhanced recycled coarse aggregate with the particle size of 4.75-26.5 mm;
i, preparing recycled fine aggregate loaded with nutrient substances
Absorbing nutrient substances to the surface and the inner pores of the recycled fine aggregate by using an internal and external pressure difference by adopting a vacuum absorption method to prepare the recycled fine aggregate with the particle size of 2.36-4.75 mm;
j, preparing self-repairing concrete
Putting 40% of the enhanced recycled coarse aggregate 1180-1320 parts, the recycled fine aggregate 145-235 parts, the sand 520-610 parts and the water 170-220 parts which are prepared in the step h into a stirrer, and stirring for 30 s; adding 300-340 parts of cement, 110-125 parts of fly ash and the rest water into a stirrer and stirring for 3-4 min; and f, adding the nutrient substances to the recycled fine aggregate in the step i, wherein 20-30% of 145-235 parts of the recycled fine aggregate is the recycled fine aggregate loaded with the nutrient substances prepared in the step i.
5. The preparation method of the crack self-repairing concrete suitable for the sewage treatment tank as claimed in claim 4, wherein the preparation method comprises the following steps: in the step d, the constant temperature shaking culture temperature is 33 ℃; step g, centrifuging at 4000r/min for 20 min; in the step h, two times of drying are carried out at 45 +/-2 ℃ by adopting a drying oven, and the nutrient substances in the steps h and i are mixed solution of lactic acid and calcium nitrate, wherein the concentration of the lactic acid is 55-65 g/L, and the concentration of the calcium nitrate is 55-65 g/L.
6. The preparation method of the crack self-repairing concrete suitable for the sewage treatment tank, according to claim 4, is characterized in that: in the step h, 1180 parts of reinforced 5d recycled coarse aggregate, 145 parts of recycled fine aggregate, 300 parts of cement, 575 parts of sand, 110 parts of fly ash and 170 parts of water are taken, and the concentrations of lactic acid and calcium nitrate in the nutrient substances in the steps h and i are both 55 g/L.
7. The preparation method of the crack self-repairing concrete suitable for the sewage treatment tank, according to claim 4, is characterized in that: in the step h, 1230 parts of reinforced 5d recycled coarse aggregate, 220 parts of recycled fine aggregate, 315 parts of cement, 520 parts of sand, 115 parts of fly ash and 180 parts of water are taken, and the concentrations of lactic acid and calcium nitrate in the nutrient substances in the steps h and i are both 55 g/L.
8. The preparation method of the crack self-repairing concrete suitable for the sewage treatment tank, according to claim 4, is characterized in that: in the step h, 1280 parts of recycled coarse aggregate for enhancing 7d, 150 parts of recycled fine aggregate, 330 parts of cement, 610 parts of sand, 120 parts of fly ash and 190 parts of water are taken, and the concentrations of lactic acid and calcium nitrate in the nutrient substances in the steps h and i are 65 g/L.
9. The preparation method of the crack self-repairing concrete suitable for the sewage treatment tank, according to claim 4, is characterized in that: in the step h, 1320 parts of recycled coarse aggregate for reinforcing the aggregate for 7d, 235 parts of recycled fine aggregate, 340 parts of cement, 545 parts of sand, 125 parts of fly ash and 200 parts of water are taken, and the concentrations of lactic acid and calcium nitrate in the nutrient substances in the steps h and i are 65 g/L.
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