CN113149496A - Concrete self-repairing material, preparation method thereof and concrete with same - Google Patents
Concrete self-repairing material, preparation method thereof and concrete with same Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
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- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
- C01F11/185—After-treatment, e.g. grinding, purification, conversion of crystal morphology
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/26—Carbonates
- C04B14/28—Carbonates of calcium
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- 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
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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
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
- C04B20/1048—Polysaccharides, e.g. cellulose, or derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/24—Sea water resistance
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Abstract
The application relates to the field of building materials, and particularly discloses a concrete self-repairing material, a preparation method thereof and concrete with the same. The concrete self-repairing material comprises: the porous substrate core is formed into porous structure inorganic particles, a plurality of mutually communicated load pore channels are arranged on the porous structure inorganic particles, and microorganisms are loaded in the load pore channels; and the anti-loss coating shell is arranged on the surface of the porous matrix core to isolate the microorganisms from the external environment. This application is with this concrete material uses porous structure's inorganic particle as the kernel, at its kernel surface cladding shell, forms the mineral through the mineral ion in the sea under the microbial action, accomplishes the selfreparing to concrete material, and this application scheme adopts the invasion of nuclear shell structure stop corrosion material simultaneously, has promoted the engineering durability and the service life of concrete preparation.
Description
Technical Field
The application relates to the field of building materials, in particular to a concrete self-repairing material, a preparation method thereof and concrete with the concrete self-repairing material.
Background
Cement concrete is the most common construction material in construction. Compared with common concrete, marine concrete faces a harsher environment, and seawater contains harmful ions of soluble salts with higher concentration, such as Cl-、SO4 2-、CO3 2-、Mg2+And Ca2+And the corrosive ions enter the matrix through the pores of the concrete and can chemically react with certain components in the set cement to generate harmful products and generate cracks, so that the durability of the concrete is seriously influenced.
Because the ocean contains a large amount of chloride ions, in the actual use process, the chloride ions can diffuse into the concrete in a building and cause corrosion of reinforcing steel bars, so that cracking and peeling of the concrete are caused, the surface performance of marine concrete is improved and strengthened frequently by adding a microorganism mineralized material in the concrete engineering, so that the porosity of the concrete is reduced, the invasion of corrosive ions in the concrete is prevented, and the engineering durability is obviously improved.
In view of the above-mentioned related technical solutions, the inventor believes that the existing marine concrete using process is gradually known by the public, but in the actual technical solution, the repairing effect of the concrete material is not significant due to the low mineralization of the microorganism on the concrete crack surface and the slow repairing efficiency, and the corrosion resistance of the concrete after being modified by the microorganism mineralization is not significantly changed, which not only improves the repairing cost, but also reduces the mechanical property of the concrete material.
Disclosure of Invention
In order to overcome the defect that a concrete repairing material has poor concrete repairing effect, the application provides a concrete self-repairing material, a preparation method thereof and concrete with the concrete self-repairing material, and the following technical scheme is adopted:
in a first aspect, the present application provides a concrete self-repairing material, which adopts the following technical scheme:
a concrete self-repairing material comprises: the porous substrate core is formed into porous structure inorganic particles, a plurality of loading pore channels are arranged on the porous structure inorganic particles, and microorganisms are loaded in the loading pore channels;
and the anti-loss coating shell is arranged on the surface of the porous matrix core to isolate the microorganisms from the external environment.
By adopting the technical scheme, the concrete material takes the inorganic particles with porous structures as the inner core, mineralized microorganisms are loaded in the pores of the inner core, mineral ions in seawater form minerals under the action of the mineralized microorganisms, the pores of the concrete are effectively filled and blocked, and the invasion of corrosive ions is prevented, so that the self-repairing performance of the concrete material is completed.
Meanwhile, the anti-loss coating shell is coated on the surface of the porous matrix core, so that on one hand, the core in the core-shell structure can be used as an inorganic framework to form a good supporting function in the concrete strengthening process; on the other hand, after the concrete self-repairing material with the core-shell structure is coated by the shell, the surface function is strengthened while the performance of a concrete matrix is ensured, pores on the surface of the concrete are filled and blocked, the compactness is improved, corrosive substances are prevented from invading, and the engineering durability and service life of concrete preparation are improved.
Further, the anti-loss coating shell is prepared from the following substances in parts by weight:
the soluble barium silver salt comprises barium nitrate and silver nitrate mixed according to the mass ratio of 1: 1.
By adopting the technical scheme, the prepared concrete self-repairing material forms a shell-core structure by selecting the metal-based (barium-silver) alginate for coating and preparing the ion response carrier, the concrete surface pores are effectively filled and blocked by the anti-loss coating shell, the compactness is improved, the invasion of corrosive substances is prevented, and the engineering durability and the service life are improved.
On this basis, to traditional microorganism mineralize mineralization repair concrete material in-process, because partial microorganism can cause the microorganism to activate prematurely along with moisture from the pore release when the concrete mixes, seriously reduce the problem of the microorganism mineralize mineralization in the later stage selfreparing process, this application still prevents the release activation of microorganism when the concrete mixes through setting up the anti-flow losing cladding shell that alginate formed, ensures the performance of later stage microorganism mineralize mineralization.
In the scheme, barium nitrate and silver nitrate are added as main materials, and the finally prepared silver-based alginate in the anti-loss coating shell can quickly respond to chloride ions and the barium-based alginate can quickly respond to sulfate ions, so that in the actual use process, after the concrete self-repairing material contacts the chloride ions and the sulfate ions, the interior of the anti-loss coating shell is damaged by inorganic particles formed by mineralization, the anti-loss coating shell is opened, the quick and efficient release of microorganisms is realized, the mineralization process of the microorganisms is accelerated, and the purposes of improving the compactness of a concrete structure and preventing the invasion of corrosive substances outside the concrete structure are achieved.
Further, the porous matrix inner core is porous calcium carbonate particles, and the porosity of the porous calcium carbonate is 20-60%.
By adopting the technical scheme, the calcium carbonate with a porous structure is preferably used as the loading substrate of the microbial material, so that on one hand, the microorganism is effectively loaded through the porous structure of the porous calcium carbonate, the loading quantity of the microorganism in the loading pore channel of the concrete self-repairing material is increased, and the complete release of the subsequent microorganism is facilitated; on the other hand, the porous structure can effectively increase the contact area between the microorganisms and the inorganic mineral, so that more contact is formed between the microorganisms and the inorganic mineral ions, the efficiency of forming inorganic substances by microorganism mineralization is improved, the microorganism mineralization process is accelerated, and the aims of quickly improving the compactness of the concrete gap structure and preventing corrosive substances outside the concrete from invading are fulfilled.
Further, the porous calcium carbonate particles are made from materials comprising, by weight:
the organic template comprises any one of polyethylene glycol, sodium dodecyl sulfate or sodium dodecyl sulfate.
Through adopting above-mentioned technical scheme, this application chooses the scheme preparation porous calcium carbonate of organic template, and calcium chloride and sodium bicarbonate are mixed with water after, and the reaction generates the nano calcium carbonate granule, forms good cladding effect to the organic template surface through the nano calcium carbonate granule, because the organic template evenly forms good disperse system in aqueous dispersion to the porous calcium carbonate granule that makes the preparation has even porosity and good structural strength.
Further, the porous matrix inner core also comprises 3-8 parts by weight of magnetic particles.
By adopting the technical scheme, because the magnetic particles are added into the inner core of the porous matrix for modification, and the magnetic particles are effectively dispersed in the porous matrix, calcium ions in a cement material are enriched in the using process, and a calcium ion gathering area taking the magnetic particles as the center is formed, so that the quantity of inorganic matters capable of being utilized by microorganisms is effectively increased, the mineralization efficiency of the microorganisms is obviously improved, the using amount of magnetic calcium carbonate microspheres is greatly reduced, and the preparation cost is reduced.
Further, the magnetic particles comprise any one or more of ferroferric oxide, chromium dioxide or cobaltosic oxide.
By adopting the technical scheme, as ferroferric oxide, chromium dioxide or cobaltosic oxide are selected as the magnetic particles, on one hand, the magnetic particles adopted by the method are stable in structure, cheap and easy to obtain, and can effectively reduce the production cost, and on the other hand, the magnetic particles adopted by the method can be uniformly dispersed in the porous matrix core in the preparation process, so that the stability and the mechanical strength of the prepared porous matrix core are improved.
Further, the microorganism is bacillus lysinate.
Through adopting above-mentioned technical scheme, the preferred lysine bacillus of this application is for carrying the microorganism, because this application is through the screening, this bacterial has high temperature resistant, quick reviving and the advantage of stronger secretase, can adapt to different environment well, and above all, it has good acid and alkali-resistance characteristic, can carry out long-term existence under having stronger acid-base corrosion environment to further prolong the life of the concrete self-repair material of this application preparation.
In a second aspect, the application provides a preparation method of a concrete self-repairing material, which adopts the following technical scheme:
a preparation method of a concrete self-repairing material comprises the following steps: s1, preparing a porous matrix inner core: according to the formula, firstly taking water, an organic template and magnetic particles, dividing the water, the organic template and the magnetic particles into two parts by weight, firstly adding calcium chloride into half mass of water, stirring and mixing to obtain a calcium chloride solution, then adding sodium bicarbonate into the rest water to obtain a sodium bicarbonate solution, respectively adding the organic template and the magnetic particles with equal mass into the calcium chloride solution and the sodium bicarbonate solution, stirring and mixing to respectively obtain a sodium bicarbonate mixed solution and a calcium chloride mixed solution, then adding the calcium chloride mixed solution into the sodium bicarbonate mixed solution under the stirring condition, standing, centrifugally separating, collecting lower-layer precipitates, washing the lower-layer precipitates with absolute ethyl alcohol, and drying and screening the lower-layer precipitates to prepare a porous matrix core;
s2, microbial loading: taking and enriching and culturing a lysine bacillus strain, collecting spore culture solution, soaking a porous matrix core into the spore culture solution according to the mass ratio of 1:10, standing for adsorption, and performing vacuum freeze drying to complete coating of a microorganism load layer to obtain an intermediate material;
s3, anti-loss coating shell coating: adding sodium alginate and soluble barium silver salt into deionized water according to a formula, stirring, mixing and ultrasonically dispersing, collecting a dispersion mixed solution, adding an intermediate material into the dispersion mixed solution according to a mass ratio of 1:8, stirring, mixing, spray drying, collecting dry particles, and thus obtaining the concrete self-repairing material.
Through adopting above-mentioned technical scheme, because this application prepares porous base member kernel earlier, as the carrier of microbiological material, after in order to prevent the microorganism load, can appear premature release in the use problem, this application still carries out the cladding processing through anti-loss cladding shell, silver-based alginate and barium-based alginate that rethread addition soluble barium silver salt and sodium alginate mixed formation, wherein silver-based alginate corresponds chloride ion response, barium-based alginate corresponds the sulfate radical ion response, realize the quick high-efficient release of microorganism through chloride ion, sulfate radical composite response, accelerate the microorganism mineralization process, reach and improve the compactedness, the purpose that prevents corrosive substance to invade, thereby make the concrete self-repairing material that this application prepared can improve its intensive effect better, increase of service life.
Further, the aperture of the screen mesh in the step S1 is 0.5-1.0 mm.
By adopting the technical scheme, the aperture of the screen is optimized, the prepared porous matrix inner core has uniform particle size, and meanwhile, when the porous matrix inner core with the optimized particle size is filled into concrete to perform strengthening action, the porous matrix inner core can effectively permeate into concrete pores due to the good size structure, so that the mechanical property and the strength of the concrete material can be further improved while the concrete material is well repaired.
In a third aspect, the present application provides a concrete, which adopts the following technical scheme:
the concrete comprises the concrete self-repairing material, and the use amount of the concrete self-repairing material in the concrete is 1% -10% of that of concrete aggregate.
Through adopting above-mentioned technical scheme, this application has adopted this concrete self repair material to replace some concrete aggregate inside the concrete to realize that surface function strengthens when guaranteeing concrete matrix performance, fill shutoff concrete surface hole, improve the compactedness, prevent corroding the invasion of material, promote engineering durability and service life.
In summary, the present application includes at least one of the following beneficial technical effects:
firstly, the concrete material takes inorganic particles with a porous structure as an inner core, mineralized microorganisms are loaded in pores of the inner core, mineral ions in seawater form minerals under the action of the mineralized microorganisms, the pores of the concrete are effectively filled and blocked, and invasion of corrosive ions is prevented, so that the self-repairing performance of the concrete material is completed. Meanwhile, the anti-loss coating shell is coated on the surface of the porous matrix core, so that on one hand, the core in the core-shell structure can be used as an inorganic framework to form a good supporting function in the concrete strengthening process; on the other hand, after the concrete self-repairing material with the core-shell structure is coated by the shell, the surface function is strengthened while the performance of a concrete matrix is ensured, pores on the surface of the concrete are filled and blocked, the compactness is improved, corrosive substances are prevented from invading, and the engineering durability and service life of concrete preparation are improved.
Secondly, the ion response carrier is prepared by coating metal-based (barium-silver) alginate, so that the prepared concrete self-repairing material forms a shell-core structure, pores on the surface of the concrete are effectively filled and blocked by the anti-leaching coating shell, the compactness is improved, the invasion of corrosive substances is prevented, the engineering durability is improved, and the service life is prolonged. On this basis, to traditional microorganism mineralize mineralization repair concrete material in-process, because partial microorganism can cause the microorganism to activate prematurely along with moisture from the pore release when the concrete mixes, seriously reduce the problem of the microorganism mineralize mineralization in the later stage selfreparing process, this application still prevents the release activation of microorganism when the concrete mixes through setting up the anti-flow losing cladding shell that alginate formed, ensures the performance of later stage microorganism mineralize mineralization. In the scheme, barium nitrate and silver nitrate are added as main materials, and the finally prepared silver-based alginate in the anti-loss coating shell can quickly respond to chloride ions and the barium-based alginate can quickly respond to sulfate ions, so that in the actual use process, after the concrete self-repairing material contacts the chloride ions and the sulfate ions, the interior of the anti-loss coating shell is damaged by inorganic particles formed by mineralization, the anti-loss coating shell is opened, the quick and efficient release of microorganisms is realized, the mineralization process of the microorganisms is accelerated, and the purposes of improving the compactness of a concrete structure and preventing the invasion of corrosive substances outside the concrete structure are achieved.
Thirdly, the magnetic particles are added into the inner core of the porous matrix for modification, and the magnetic particles are effectively dispersed in the porous matrix, so that calcium ions in the cement material are enriched in the using process, and a calcium ion gathering area taking the magnetic particles as the center is formed, so that the quantity of inorganic matters capable of being utilized by microorganisms is effectively increased, the mineralization efficiency of the microorganisms is obviously improved, the using amount of the magnetic calcium carbonate microspheres is greatly reduced, and the preparation cost is reduced.
The bacillus lysinate is preferably selected as the load microorganism, and the bacillus lysinate has the advantages of high temperature resistance, quick revival and strong secretase due to the screening, can be well adapted to different environments, and most importantly, has good acid and alkali resistance, and can survive for a long time in a strong acid-base corrosion environment, so that the service life of the concrete self-repairing material prepared by the application is further prolonged.
Detailed Description
The present application will be described in further detail with reference to examples.
In the examples of the present application, the raw materials and the equipment used are as follows, but not limited thereto.
Preparation example
Preparation of lysine bacillus strain
Preparation example 1
The method comprises the steps of taking high-calcium soil with the calcium content of 14500-18850 mu g/mL sampled in Yumen Gansu, screening and extracting mineralized microbial strains from the high-calcium soil, separating the microbial strains by adopting a high-flux microbial reaction system, respectively culturing in a solid culture medium to obtain a plurality of single microbial strains, judging to select separated strains through mineralized product deposition, and screening to obtain the lysine bacillus strains.
Examples
Example 1
S1, preparing a porous matrix inner core: adding 0.5kg of calcium chloride into 7.5kg of water, stirring and mixing to obtain a calcium chloride solution, adding 0.5kg of sodium bicarbonate into 7.5kg of water to obtain a sodium bicarbonate solution, respectively adding 1kg of sodium dodecyl sulfate and 0.3kg of 1000-mesh ferroferric oxide magnetic particles with equal mass into the calcium chloride solution and the sodium bicarbonate solution, stirring and mixing to respectively obtain a sodium bicarbonate mixed solution and a calcium chloride mixed solution, then adding the calcium chloride mixed solution into the sodium bicarbonate mixed solution under the stirring condition of 30 ℃, standing for 2 hours, performing centrifugal separation to collect a lower-layer precipitate, washing the lower-layer precipitate with absolute ethyl alcohol, drying the lower-layer precipitate through a 0.5mm screen mesh, and preparing a porous matrix core with the porosity of 20%;
s2, microbial loading: taking lysine bacillus strains, carrying out enrichment culture for 48h, collecting spore culture solution, soaking 1kg of porous matrix core into 10kg of spore culture solution, standing for adsorption, and carrying out vacuum freeze drying to complete coating of a microorganism loading layer to obtain an intermediate material;
s3, anti-loss coating shell coating: adding 1kg of sodium alginate, 0.1kg of silver nitrate and 0.1kg of barium nitrate into 4kg of deionized water according to a formula, stirring, mixing and ultrasonically dispersing for 15min, collecting a dispersion mixed solution, adding 0.1kg of an intermediate material into 0.8kg of the dispersion mixed solution according to a mass ratio of 1:8, stirring, mixing, spray drying, and collecting dried particles to prepare the concrete reinforcing material.
Examples 2 to 5
Examples 2 to 5: the difference between the concrete self-repairing material and the embodiment 1 is that the raw material proportion is shown in tables 2-3.
Table 2 examples 1-5 amounts of core Material Components for porous substrates
TABLE 3 EXAMPLES 1-5 raw material component amounts for preparation of sag resistant coated casing
Example 6: the difference between the concrete self-repairing material and the embodiment 2 is that the porosity of the porous matrix core in the concrete self-repairing material is 40%, and other preparation conditions and parameter settings are the same as those in the embodiment 2.
Example 7: the difference between the concrete self-repairing material and the embodiment 2 is that the porosity of the porous matrix core in the concrete self-repairing material is 60%, and other preparation conditions and parameter settings are the same as those in the embodiment 2.
Example 8: the difference between the concrete self-repairing material and the embodiment 2 is that the particle size of the porous matrix core in the concrete self-repairing material is 0.75mm, and other preparation conditions and parameter settings are the same as those in the embodiment 2.
Example 9: the difference between the concrete self-repairing material and the embodiment 2 is that the particle size of the porous matrix core in the concrete self-repairing material is 1.0mm, and other preparation conditions and parameter settings are the same as those in the embodiment 2.
Comparative example
Comparative example 1: the difference between the concrete self-repairing material and the embodiment 2 is that the concrete self-repairing material is not provided with the anti-loss coating shell.
Comparative example 2: the difference between the concrete self-repairing material and the embodiment 2 is that polyvinyl alcohol is adopted to replace sodium alginate in the concrete self-repairing material to prepare the anti-loss coating shell.
Comparative example 3: the difference between the concrete self-repairing material and the concrete self-repairing material in the embodiment 2 is that no microorganism is added in the concrete self-repairing material.
Comparative example 4: the difference between the concrete self-repairing material and the concrete self-repairing material in example 2 is that diatomite with the particle size of 0.5mm is adopted to replace a porous matrix inner core in the concrete self-repairing material.
Comparative example 5: the difference between the concrete self-repairing material and the embodiment 2 is that no organic template is added when the porous matrix inner core is prepared in the concrete self-repairing material.
Comparative example 6: the difference between the concrete self-repairing material and the embodiment 2 is that 0.55kg of ferrous oxide particles are adopted to replace ferroferric oxide magnetic particles when the porous matrix core is prepared in the concrete self-repairing material.
Performance test
The concrete self-repairing materials prepared in the examples 1-9 and the comparative examples 1-6 are added into concrete respectively, and the total amount of the cementing materials is fixed to be 450kg/m3The sand rate is 33% -35%, the water reducing agent and the fine adjustment workability of the sand rate are used, the self-repairing material of the concrete is adopted to replace part of aggregate in the cement during construction, the replacement proportion is that the water-cement ratio is kept unchanged, and a test piece with the size of 300mm multiplied by 30mm is prepared;
in examples 1 to 9, the ratio of the concrete self-repairing material replacing a part of the aggregate in the cement was 10%, and then example 10 was set, the replacement ratio adopted in example 10 was 1%, and the remaining steps and conditions were the same as those in example 9.
The test piece is maintained at normal temperature for 24 hours, then maintained at normal temperature for 7 days, and then placed in a seawater environment (Cl)-Concentration of 0.8mol, SO4 2+Simulated seawater with the ion concentration of 0.6 mol) and monitoring the pore characteristics of the surface layer of the test piece; the volume ratio of the simulated seawater to the sample is 1.5, and the simulated seawater is replaced every two weeks; and for the dry-wet cycle condition, the sample undergoes a dry-wet cycle every 24 hours, the sample is soaked for 12 hours and then dried for 12 hours, and for the drying process in the dry-wet cycle condition, the temperature is set to be 20 +/-1 ℃ according to the change trend of the annual temperature and humidity in the south sea area, and the relative humidity is 80%.
Detection method/test method
And continuously observing the width of the crack on the surface of the sample by using a stereoscopic microscope (the magnification is 50 times) in the crack self-repairing process. The calculation formula of the fracture healing rate is as follows: a ═ is (W1-W2)/W1, where a is the fracture healing rate, W1 is the initial fracture width, and W2 is the repaired fracture width, and the fracture healing rates were measured after 30 days, 45 days, and 60 days, respectively, and the specific test results are shown in table 4 below:
TABLE 4 fracture healing Rate Performance test Table
Combining the above conclusions and referring to the comparison of the performance tests of table 4, it can be found that:
(1) the performance tests in table 4 show that the concrete self-repairing material prepared in the technical scheme has a good repairing effect on the concrete material, so that the technical scheme selects the metal-based (barium silver) alginate to coat and prepare the ion response carrier, the prepared concrete self-repairing material forms a shell-core structure, and the engineering durability and service life are improved; on the basis, the anti-loss coating shell formed by alginate is arranged, so that the release and activation of microorganisms during concrete mixing are avoided, and the later-stage microbial mineralization is ensured to be exerted; in the scheme, barium nitrate and silver nitrate are added as main materials, silver-based alginate in the finally prepared anti-loss coating shell can quickly respond to chloride ions, and barium-based alginate can quickly respond to sulfate ions, so that in the actual use process, after concrete is contacted with the chloride ions and the sulfate ions, the anti-loss coating shell is damaged by inorganic particles formed by mineralization, and therefore the anti-loss coating shell is opened.
(2) The performance comparison between the embodiments 6-7 and the embodiments 8-9 and the embodiments 1-5 shows that the technical scheme optimizes the particle size and porosity of the porous matrix core and can effectively permeate into concrete pores, so that the mechanical properties and strength of the concrete material can be further improved while the concrete material is well repaired.
(3) Comparing the example 10 with the example 9, it can be seen from the table that the repair performance of the concrete self-repairing material prepared in the technical scheme of the application is significantly better than that of the example 10 because the replacement proportion adopted in the example 9 is 10%, which shows that the concrete self-repairing material can effectively fill and block the pores on the surface of concrete, improve the compactness, prevent the invasion of corrosive substances, and improve the engineering durability and service life.
(4) Data comparison is carried out between comparative examples 1-2 and examples 1-5, and the anti-loss coated shell structure in comparative examples 1-2 is changed, and data in Table 4 show that the repair performance is remarkably reduced, which further illustrates that the anti-loss coated shell formed by alginate in the technical scheme of the application avoids the release and activation of microorganisms during concrete mixing and ensures the exertion of the mineralization of microorganisms in the later period.
(5) Comparing the comparative example 3 with the example 2, because the technical scheme in the comparative example 3 does not add microorganisms, as can be seen from table 4, the strain has no repairing performance, and the crack structure of the strain continuously expands along with the passage of time, which indicates that the technical scheme of the application prefers the bacillus lysinate as the load microorganism.
(6) Comparing the comparative example 4 with the example 2, the repair performance of the porous matrix is reduced as the core of the porous matrix is adjusted in the comparative example 4, which shows that the calcium carbonate with a porous structure is preferably used as the load matrix of the microbial material in the technical scheme of the application, and on one hand, the porous structure of the porous calcium carbonate is used for effectively loading the microbes, so that the load quantity of the microbes in the load pore channel of the concrete self-repairing material is increased, and the subsequent microbes are conveniently and completely released; on the other hand, the porous structure can effectively increase the contact area between the microorganisms and the inorganic mineral, so that more contact is formed between the microorganisms and the inorganic mineral ions, the efficiency of forming inorganic substances by microorganism mineralization is improved, the microorganism mineralization process is accelerated, and the aims of quickly improving the compactness of the concrete gap structure and preventing corrosive substances outside the concrete from invading are fulfilled.
(7) Comparing the comparative example 5 with the example 2, the comparative example 5 adjusts the scheme for preparing the porous matrix core, and the repair performance is reduced, which shows that the technical scheme of the application selects the scheme of the organic template for preparing the porous calcium carbonate, the calcium chloride, the sodium bicarbonate and the water are mixed and then react to generate the nano calcium carbonate particles, the nano calcium carbonate particles form a good coating effect on the surface of the organic template, and the organic template is uniformly dispersed in the water to form a good dispersion system, so that the prepared porous calcium carbonate particles can accelerate the process of microorganism mineralization, and the purposes of improving the compactness of a concrete structure and preventing the invasion of corrosive substances outside the concrete structure are achieved.
(8) Comparing the comparative example 6 with the example 2, the scheme of adding the magnetic particles into the porous matrix core is adjusted in the comparative example 6, and the repair performance is reduced, which shows that the technical scheme of the application selects the magnetic particles to be added into the porous matrix core for modification, and the calcium ions in the cement material are enriched through the effective dispersion of the magnetic particles in the porous aggregate in the using process, so that a calcium plasma aggregation area taking the magnetic particles as the center is formed, the inorganic matters available for the microorganisms are effectively improved, and the mineralization efficiency of the microorganisms is further obviously improved.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. A concrete self-repairing material is characterized by comprising:
the porous substrate core is formed into porous structure inorganic particles, a plurality of loading pore channels are arranged on the porous structure inorganic particles, and microorganisms are loaded in the loading pore channels;
and the anti-loss coating shell is arranged on the surface of the porous matrix core to isolate the microorganisms from the external environment.
2. The concrete self-repairing material of claim 1, wherein the anti-run-off coating shell is made of the following materials in parts by weight:
40-80 parts of deionized water;
10-15 parts of sodium alginate;
2-10 parts of soluble barium silver salt;
the soluble barium silver salt comprises barium nitrate and silver nitrate mixed according to the mass ratio of 1: 1.
3. The concrete self-repairing material of claim 1, wherein the porous matrix inner core is porous calcium carbonate particles, and the porosity of the porous calcium carbonate is 20-60%.
4. The concrete self-repairing material of claim 3, wherein the porous calcium carbonate particles are made from materials comprising, by weight:
5-15 parts of calcium chloride;
5-15 parts of sodium bicarbonate;
150-200 parts of water;
10-15 parts of an organic template;
the organic template comprises any one of polyethylene glycol, sodium dodecyl sulfate or sodium dodecyl sulfate.
5. The concrete self-repairing material of claim 4, wherein the porous matrix inner core further comprises 3-8 parts by weight of magnetic particles.
6. The concrete self-repairing material of claim 5, wherein the magnetic particles comprise a mixture of any one or more of ferroferric oxide, chromium dioxide or cobaltosic oxide.
7. The concrete self-repairing material of claim 1, wherein the microorganism is bacillus lysimachiae.
8. The preparation method of the concrete self-repairing material of claim 1, characterized by comprising the following concrete preparation steps:
s1, preparing a porous matrix inner core: according to the formula, firstly taking water, an organic template and magnetic particles, dividing the water, the organic template and the magnetic particles into two parts by weight, firstly adding calcium chloride into half mass of water, stirring and mixing to obtain a calcium chloride solution, then adding sodium bicarbonate into the rest water to obtain a sodium bicarbonate solution, respectively adding the organic template and the magnetic particles with equal mass into the calcium chloride solution and the sodium bicarbonate solution, stirring and mixing to respectively obtain a sodium bicarbonate mixed solution and a calcium chloride mixed solution, then adding the calcium chloride mixed solution into the sodium bicarbonate mixed solution under the stirring condition, standing, centrifugally separating, collecting lower-layer precipitates, washing the lower-layer precipitates with absolute ethyl alcohol, and drying and screening the lower-layer precipitates to prepare a porous matrix core;
s2, microbial loading: taking and enriching and culturing a lysine bacillus strain, collecting spore culture solution, soaking a porous matrix core into the spore culture solution according to the mass ratio of 1:10, standing for adsorption, and performing vacuum freeze drying to complete coating of a microorganism load layer to obtain an intermediate material;
s3, anti-loss coating shell coating: adding sodium alginate and soluble barium silver salt into deionized water according to a formula, stirring, mixing and ultrasonically dispersing, collecting a dispersion mixed solution, adding an intermediate material into the dispersion mixed solution according to a mass ratio of 1:8, stirring, mixing, spray drying, collecting dry particles, and thus obtaining the concrete self-repairing material.
9. The preparation method of the concrete self-repairing material of claim 8, wherein the screen mesh of step S1 has a pore size of 0.5-1.0 mm.
10. The concrete is characterized by comprising the concrete self-repairing material as claimed in any one of claims 1 to 7, wherein the usage amount of the concrete self-repairing material in the concrete is 1% -10% of the concrete aggregate.
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| CN114716170A (en) * | 2022-03-17 | 2022-07-08 | 华南理工大学 | Core-shell type particle and preparation method and application thereof |
| WO2023065437A1 (en) * | 2021-10-21 | 2023-04-27 | 江苏科技大学 | Self-repairing microsphere with multi-layer core-shell structure, preparation method therefor and application thereof |
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Application publication date: 20210723 |