CN112551973A - Anti-cracking self-repairing concrete and preparation method thereof - Google Patents
Anti-cracking self-repairing concrete and preparation method thereof Download PDFInfo
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- CN112551973A CN112551973A CN202011401005.7A CN202011401005A CN112551973A CN 112551973 A CN112551973 A CN 112551973A CN 202011401005 A CN202011401005 A CN 202011401005A CN 112551973 A CN112551973 A CN 112551973A
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant 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
- 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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Abstract
The invention relates to anti-cracking self-repairing concrete and a preparation method thereof, belonging to the technical field of preparation of building materials. The crack-resistant self-repairing concrete is prepared by arranging the effective components of the self-made repairing filler, the shell powder crushed material, the self-made slag crack-resistant repairing agent, the composite crack-resistant repairing filler, the ethylene diamine tetraacetic acid, the sodium aluminosilicate and the like, can automatically repair concrete cracks, can effectively prevent the concrete cracks from being generated, and has wide application prospect.
Description
Technical Field
The invention relates to anti-cracking self-repairing concrete and a preparation method thereof, belonging to the technical field of preparation of building materials.
Background
The concrete material has higher compressive strength, good durability and lower cost, is widely applied to modern civil engineering construction of buildings, bridges, water conservancy and power, nuclear power, ports, oceans and the like, and is applied and developed to large-span, high-rise, giant and special structural engineering at present. For a considerable period of time in the future, concrete will remain the indispensable, leading building material for the civil engineering of the world. However, the concrete material inevitably causes local damage such as micro cracks during long-term use and under the influence of the surrounding complex environment. After the concrete is damaged, the service performance and the durability of the structure are greatly influenced, the service life of the structure is shortened by a light person, and the safety of the structure is seriously threatened.
In recent years, the self-repairing of concrete cracks mainly comprises the following 3 types:
1. when cracks are generated or expanded, the capsules or the fibers are cracked, and the repairing agent flows out to finish repairing;
2. arranging devices such as an SMA (shape memory alloy) inductor and the like in concrete to manufacture an intelligent concrete structure, automatically sensing when a crack is generated, and effectively repairing the crack under the action of an SMA shape memory effect;
3. and (3) cement-based permeable crystallization type self-repairing.
However, the traditional crack repairing means are post-treatment and passive repairing and have no effect on concrete microcracks.
In view of the above drawbacks, the designer actively makes research and innovation to create a crack-resistant self-repairing concrete and a preparation method thereof, so that the concrete has industrial utilization value.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide anti-cracking self-repairing concrete and a preparation method thereof.
The invention relates to anti-cracking self-repairing concrete which comprises the following components in parts by weight:
55-65 parts of ordinary portland cement;
15-20 parts of composite anti-cracking repair filler;
50-60 parts of expanded perlite;
200-250 parts of water;
the composite anti-cracking repair filler is prepared by mixing a self-made repair filler and fine shell powder materials in proportion; through enriching the bacillus cereus in the zeolite of the immobilized microorganism and under the condition of water permeating from the microcracks, arabic gum and nutrient substances are taken as nutrients, metabolism is carried out to release carbon dioxide and generate high temperature, the release of the carbon dioxide enables the system to expand, on one hand, the volume expansion enables the concrete to be further compacted, the compactness is improved, partial microcracks are offset, the effect of closing water and oxygen permeation channels is achieved, the anti-corrosion performance is improved, secondly, the generated carbon dioxide and water can react with calcium carbonate in shell powder to enable the shell powder to be dissolved into calcium bicarbonate solution, the calcium bicarbonate solution is absorbed into the microcracks under the capillary action of the microcracks, and the calcium bicarbonate is deposited again to form calcium carbonate crystals under the action of heat generated by metabolism of the microorganism, so that the microcracks are blocked, thereby having the self-repairing effect of concrete cracks;
the self-made repair filler is prepared by mixing and reacting zeolite, tryptone, yeast extract, sucrose, calcium chloride solution, bacillus cereus liquid and arabic gum liquid. Enriching bacillus cereus by utilizing nutrient substances in pores of zeolite, adding Arabic gum solution, performing cementing and packaging reaction by utilizing the Arabic gum solution and the zeolite, and further fixing and dormancy the microorganisms to obtain the zeolite enriched with immobilized microorganisms as a self-made repairing filler; the self-made repairing filler is enriched with the bacillus cereus, the bacillus cereus is added into concrete, the bacillus cereus can accelerate and induce the deposition of calcium carbonate on the surface area of a crack in a crack environment enriched with calcium ions, so that a better crack self-repairing effect is achieved, the bacillus cereus can secrete carbonic anhydrase, the hydration reaction of carbon dioxide is effectively improved, the conversion of the carbon dioxide to bicarbonate radical is promoted, the bicarbonate radical and hydroxyl ions quickly react to generate carbonate radical ions in the crack alkaline solution environment of the concrete, and the calcium ions in the crack solution are continuously chelated to generate calcium carbonate precipitates, so that the self-repairing effect of the concrete is improved, meanwhile, the crack of the concrete is prevented from growing and growing, and the crack resistance effect is achieved;
further, the paint comprises the following components in parts by weight:
55-65 parts of ordinary portland cement;
15-20 parts of composite anti-cracking repair filler;
10-15 parts of a self-made slag crack-resistant repairing agent;
50-60 parts of expanded perlite;
200-250 parts of water;
the self-made slag crack-resistant repairing agent comprises coarse slag and phosphogypsum.
Further, the paint comprises the following components in parts by weight:
55-65 parts of ordinary portland cement;
15-20 parts of composite anti-cracking repair filler;
10-15 parts of a self-made slag crack-resistant repairing agent;
50-60 parts of expanded perlite;
200-250 parts of water;
the self-made slag crack-resistant repairing agent comprises coarse slag, phosphogypsum and sodium aluminosilicate. The phosphogypsum mainly comprises dihydrate phosphogypsum, slag and sulfate in the phosphogypsum are subjected to hydration reaction under the alkaline excitation catalysis of sodium aluminosilicate to generate tricalcium aluminate hydrate and calcium silicate hydrate gel, the tricalcium aluminate hydrate and the dihydrate phosphogypsum are subjected to secondary reaction again in the sodium aluminosilicate to generate ettringite with higher strength, hydration products generated by the hydration reaction form a layer of spatial network structure on the surface of the phosphogypsum, the generated calcium silicate hydrate gel and ettringite are gradually increased along with the progress of the hydration reaction, the formed network structure is tighter, gaps are reduced, the strength is improved, and therefore the anti-cracking repair effect of filling and sealing the inner pores of concrete is achieved;
further, the paint comprises the following components in parts by weight:
55-65 parts of ordinary portland cement;
15-20 parts of composite anti-cracking repair filler;
10-15 parts of a self-made slag crack-resistant repairing agent;
3-5 parts of ethylene diamine tetraacetic acid;
50-60 parts of expanded perlite;
200-250 parts of water.
Further, the preparation steps of the composite anti-crack repair filler are as follows:
(1) weighing 40-50 parts of zeolite, 5-6 parts of tryptone, 2-3 parts of yeast extract, 1-2 parts of sucrose and 150-180 parts of calcium chloride solution with the mass fraction of 10%, mixing, placing on a shaking table, shaking and dipping for 40-60 min, and filtering to obtain a filter cake, namely the pretreated zeolite;
(2) mixing the above pretreated zeolite with a concentration of 107Mixing cfu/mL bacillus cereus liquid according to a mass ratio of 1:10, standing and enriching for 24h at 37 ℃, obtaining bacterium-carrying zeolite after enrichment is finished, mixing and stirring the bacterium-carrying zeolite and 15% acacia gum liquid according to a mass ratio of 1:10 for 40-50 min, filtering after reaction is finished to obtain filter residue, and naturally drying to obtain the self-made repair filler;
(3) and mixing the self-made repair filler and the fine shell powder material according to the mass ratio of 1:3 to obtain the composite anti-cracking repair filler.
Further, the self-made slag crack-resistant repairing agent comprises the following preparation steps:
(1) collecting waste slag generated after blast furnace ironmaking, sieving with a 50-mesh sieve, and collecting to obtain slag coarse material;
(2) and mixing the obtained slag coarse material, phosphogypsum and sodium aluminosilicate according to the mass ratio of 10:17:1 to obtain the self-made slag crack resistance repairing agent.
Further, the concrete preparation steps of the anti-cracking self-repairing concrete are as follows:
weighing 55-65 parts of ordinary portland cement, 15-20 parts of composite anti-cracking repairing filler, 10-15 parts of self-made slag anti-cracking repairing agent, 3-5 parts of ethylenediamine tetraacetic acid, 50-60 parts of expanded perlite and 200-250 parts of water in parts by weight, sequentially loading into a stirring truck, stirring at the rotating speed of 70-80 r/min at the temperature of 45-55 ℃ for 4-5 min, and discharging to obtain the anti-cracking self-repairing concrete.
Further, the mesh number of the fine materials of the shell powder crushed material is 100 meshes.
Further, the mesh number of the slag coarse material is 50 meshes. By compounding and using the fine material and the coarse material, the size matching and filling among the raw materials are realized, the early-stage dense filling degree of the concrete is increased, and the generation of partial primary cracks is eliminated, so that the growth and expansion of later-stage cracks are prevented, and the primary crack resistance effect is realized;
by the scheme, the invention at least has the following advantages:
the crack-resistant self-repairing concrete is prepared by arranging the effective components of the self-made repairing filler, the shell powder crushed material, the self-made slag crack-resistant repairing agent, the composite crack-resistant repairing filler, the ethylene diamine tetraacetic acid, the sodium aluminosilicate and the like, can automatically repair concrete cracks, can effectively prevent the concrete cracks from being generated, and has wide application prospect.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate a certain embodiment of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is an electron micrograph of actual dimensions of concrete of example 1 of the present invention after curing for 3 days, which was chiseled out for SEM analysis;
FIG. 2 is an electron micrograph at 500 times magnification of an SEM analysis of a concrete of example 1 of the present invention after curing for 3 days while chiseling;
FIG. 3 is an electron micrograph of actual dimensions of concrete of example 1 of the present invention after 28 days of curing and after chiseling for SEM analysis;
FIG. 4 is an electron micrograph at 500 times magnification of an SEM analysis of a concrete of example 1 of the present invention after it was cured for 28 days by chiseling.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
(1) Weighing 40-50 parts of zeolite, 5-6 parts of tryptone, 2-3 parts of yeast extract, 1-2 parts of sucrose and 150-180 parts of calcium chloride solution with the mass fraction of 10%, mixing, placing on a shaking table, shaking and dipping for 40-60 min, and filtering to obtain a filter cake, namely the pretreated zeolite; utilizing the abundant pore space structure of zeolite to adsorb nutrient substances and calcium ion salts;
(2) mixing the above pretreated zeolite with a concentration of 107Mixing cfu/mL bacillus cereus liquid according to a mass ratio of 1:10, standing and enriching for 24h at 37 ℃, obtaining bacterium-carrying zeolite after enrichment is finished, mixing and stirring the bacterium-carrying zeolite and 15% acacia gum liquid according to a mass ratio of 1:10 for 40-50 min, filtering after reaction is finished to obtain filter residue, and naturally drying to obtain the self-made repair filler; enrichment of waxy spores with nutrients in zeolite poresAdding gum arabic liquid, performing a cementing and packaging reaction by using the gum arabic liquid and zeolite, and further fixing and dormancy of microorganisms to obtain the zeolite enriched with immobilized microorganisms, which is used as a self-made repairing filler; the self-made repairing filler is enriched with the bacillus cereus, the bacillus cereus is added into concrete, the bacillus cereus can accelerate and induce the deposition of calcium carbonate on the surface area of a crack in a crack environment enriched with calcium ions, so that a better crack self-repairing effect is achieved, the bacillus cereus can secrete carbonic anhydrase, the hydration reaction of carbon dioxide is effectively improved, the conversion of the carbon dioxide to bicarbonate radical is promoted, the bicarbonate radical and hydroxyl ions quickly react to generate carbonate radical ions in the crack alkaline solution environment of the concrete, and the calcium ions in the crack solution are continuously chelated to generate calcium carbonate precipitates, so that the self-repairing effect of the concrete is improved, meanwhile, the crack of the concrete is prevented from growing and growing, and the crack resistance effect is achieved;
(3) collecting waste shells, putting the waste shells into a grinder, grinding for 1-2 hours, sieving with a 100-mesh sieve, collecting sieved materials to obtain fine materials of the crushed shells, collecting waste slag generated after blast furnace ironmaking, sieving with a 50-mesh sieve, and collecting coarse slag materials; by compounding and using the fine material and the coarse material, the size matching and filling among the raw materials are realized, the early-stage dense filling degree of the concrete is increased, and the generation of partial primary cracks is eliminated, so that the growth and expansion of later-stage cracks are prevented, and the primary crack resistance effect is realized;
(4) mixing the obtained slag coarse material, phosphogypsum and sodium aluminosilicate according to the mass ratio of 10:17:1 to obtain a self-made slag crack resistance repairing agent; the phosphogypsum mainly comprises dihydrate phosphogypsum, slag and sulfate in the phosphogypsum are subjected to hydration reaction under the alkaline excitation catalysis of sodium aluminosilicate to generate tricalcium aluminate hydrate and calcium silicate hydrate gel, the tricalcium aluminate hydrate and the dihydrate phosphogypsum are subjected to secondary reaction again in the sodium aluminosilicate to generate ettringite with higher strength, hydration products generated by the hydration reaction form a layer of spatial network structure on the surface of the phosphogypsum, the generated calcium silicate hydrate gel and ettringite are gradually increased along with the progress of the hydration reaction, the formed network structure is tighter, gaps are reduced, the strength is improved, and therefore the anti-cracking repair effect of filling and sealing the inner pores of concrete is achieved;
(5) mixing the self-made repair filler and the fine shell powder material according to the mass ratio of 1:3 to obtain the composite anti-cracking repair filler; through enriching the bacillus cereus in the zeolite of the immobilized microorganism and under the condition of water permeating from the microcracks, arabic gum and nutrient substances are taken as nutrients, metabolism is carried out to release carbon dioxide and generate high temperature, the release of the carbon dioxide enables the system to expand, on one hand, the volume expansion enables the concrete to be further compacted, the compactness is improved, partial microcracks are offset, the effect of closing water and oxygen permeation channels is achieved, the anti-corrosion performance is improved, secondly, the generated carbon dioxide and water can react with calcium carbonate in shell powder to enable the shell powder to be dissolved into calcium bicarbonate solution, the calcium bicarbonate solution is absorbed into the microcracks under the capillary action of the microcracks, and the calcium bicarbonate is deposited again to form calcium carbonate crystals under the action of heat generated by metabolism of the microorganism, so that the microcracks are blocked, thereby having the self-repairing effect of concrete cracks;
(6) weighing 55-65 parts of ordinary portland cement, 15-20 parts of composite anti-cracking repairing filler, 10-15 parts of self-made slag anti-cracking repairing agent, 3-5 parts of ethylenediamine tetraacetic acid, 50-60 parts of expanded perlite and 200-250 parts of water in parts by weight, sequentially loading into a stirring truck, stirring at the rotating speed of 70-80 r/min at the temperature of 45-55 ℃ for 4-5 min, and discharging to obtain the anti-cracking self-repairing concrete. Because the active chemical component ethylene diamine tetraacetic acid is added, after cracks are generated in the concrete, external water infiltrates and the active chemical component ethylene diamine tetraacetic acid is carried into the concrete cracks, the active chemical component ethylene diamine tetraacetic acid can complex calcium ions in the concrete material to generate a soluble complex compound, the soluble complex compound permeates into the concrete under the action of concentration difference and chemical potential, chemical conversion is generated when free silicate ions meet, the calcium ions are taken away to generate more stable hydrated calcium silicate gel, and the chemical conversion is easy to occur in the holes and cracks, and conversion products fill the cracks. In addition, the process can consume a cement hydration product calcium hydroxide, so that the secondary hydration of unhydrated cement in the concrete is promoted, the healing of concrete cracks is facilitated, and the anti-cracking self-repairing effect of the concrete is further improved.
Example 1
Weighing 40-50 parts of zeolite, 5-6 parts of tryptone, 2-3 parts of yeast extract, 1-2 parts of sucrose and 150-180 parts of calcium chloride solution with the mass fraction of 10%, mixing, placing on a shaking table, shaking and dipping for 40-60 min, and filtering to obtain a filter cake, namely the pretreated zeolite;
mixing the above pretreated zeolite with a concentration of 107Mixing cfu/mL bacillus cereus liquid according to a mass ratio of 1:10, standing and enriching for 24h at 37 ℃, obtaining bacterium-carrying zeolite after enrichment is finished, mixing and stirring the bacterium-carrying zeolite and 15% acacia gum liquid according to a mass ratio of 1:10 for 40-50 min, filtering after reaction is finished to obtain filter residue, and naturally drying to obtain the self-made repair filler;
collecting waste shells, putting the waste shells into a grinder, grinding for 1-2 hours, sieving with a 100-mesh sieve, collecting sieved materials to obtain fine materials of the crushed shells, collecting waste slag generated after blast furnace ironmaking, sieving with a 50-mesh sieve, and collecting coarse slag materials;
mixing the obtained slag coarse material, phosphogypsum and sodium aluminosilicate according to the mass ratio of 10:17:1 to obtain a self-made slag crack resistance repairing agent;
mixing the self-made repair filler and the fine shell powder material according to the mass ratio of 1:3 to obtain the composite anti-cracking repair filler;
weighing 55-65 parts of ordinary portland cement, 15-20 parts of composite anti-cracking repairing filler, 10-15 parts of self-made slag anti-cracking repairing agent, 3-5 parts of ethylenediamine tetraacetic acid, 50-60 parts of expanded perlite and 200-250 parts of water in parts by weight, sequentially loading into a stirring truck, stirring at the rotating speed of 70-80 r/min at the temperature of 45-55 ℃ for 4-5 min, and discharging to obtain the anti-cracking self-repairing concrete.
Example 2
Weighing 40-50 parts of zeolite, 5-6 parts of tryptone, 2-3 parts of yeast extract, 1-2 parts of sucrose and 150-180 parts of calcium chloride solution with the mass fraction of 10%, mixing, placing on a shaking table, shaking and dipping for 40-60 min, and filtering to obtain a filter cake, namely the pretreated zeolite;
mixing the above pretreated zeolite with a concentration of 107Mixing cfu/mL bacillus cereus liquid according to a mass ratio of 1:10, standing and enriching for 24h at 37 ℃, obtaining bacterium-carrying zeolite after enrichment is finished, mixing and stirring the bacterium-carrying zeolite and 15% acacia gum liquid according to a mass ratio of 1:10 for 40-50 min, filtering after reaction is finished to obtain filter residue, and naturally drying to obtain the self-made repair filler;
collecting waste shells, putting the waste shells into a grinder, grinding for 1-2 hours, sieving with a 100-mesh sieve, collecting sieved materials to obtain fine materials of the crushed shells, collecting waste slag generated after blast furnace ironmaking, sieving with a 50-mesh sieve, and collecting coarse slag materials;
mixing the obtained slag coarse material, phosphogypsum and sodium aluminosilicate according to the mass ratio of 10:17:1 to obtain a self-made slag crack resistance repairing agent;
mixing the self-made repair filler and the fine shell powder material according to the mass ratio of 1:3 to obtain the composite anti-cracking repair filler;
weighing 55-65 parts of ordinary portland cement, 15-20 parts of composite anti-cracking repairing filler, 10-15 parts of self-made slag anti-cracking repairing agent, 3-5 parts of ethylenediamine tetraacetic acid, 50-60 parts of expanded perlite and 200-250 parts of water in parts by weight, sequentially loading into a stirring truck, stirring at the rotating speed of 70-80 r/min at the temperature of 45-55 ℃ for 4-5 min, and discharging to obtain the anti-cracking self-repairing concrete.
Example 3
Weighing 40-50 parts of zeolite, 5-6 parts of tryptone, 2-3 parts of yeast extract, 1-2 parts of sucrose and 150-180 parts of calcium chloride solution with the mass fraction of 10%, mixing, placing on a shaking table, shaking and dipping for 40-60 min, and filtering to obtain a filter cake, namely the pretreated zeolite;
mixing the above pretreated zeolite with a concentration of 107Mixing cfu/mL bacillus cereus liquid according to the mass ratio of 1:10, standing and enriching for 24h at 37 ℃, obtaining bacterium-carrying zeolite after the enrichment is finished, mixing and stirring the bacterium-carrying zeolite and 15% acacia gum liquid according to the mass ratio of 1:10 for 40-50 min, filtering after the reaction is finished to obtain filter residue,naturally drying to obtain a self-made repairing filler;
collecting waste shells, putting the waste shells into a grinder, grinding for 1-2 hours, sieving with a 100-mesh sieve, collecting sieved materials to obtain fine materials of the crushed shells, collecting waste slag generated after blast furnace ironmaking, sieving with a 50-mesh sieve, and collecting coarse slag materials;
mixing the obtained slag coarse material, phosphogypsum and sodium aluminosilicate according to the mass ratio of 10:17:1 to obtain a self-made slag crack resistance repairing agent;
mixing the self-made repair filler and the fine shell powder material according to the mass ratio of 1:3 to obtain the composite anti-cracking repair filler;
weighing 55-65 parts of ordinary portland cement, 15-20 parts of composite anti-cracking repairing filler, 10-15 parts of self-made slag anti-cracking repairing agent, 3-5 parts of ethylenediamine tetraacetic acid, 50-60 parts of expanded perlite and 200-250 parts of water in parts by weight, sequentially loading into a stirring truck, stirring at the rotating speed of 70-80 r/min at the temperature of 45-55 ℃ for 4-5 min, and discharging to obtain the anti-cracking self-repairing concrete.
Example 4
The preparation method is basically the same as that of example 1, except that the self-healing filler of the invention is not added, and other conditions and component ratios are the same as those in example 1.
Example 5
The preparation method is basically the same as that of example 1, except that the self-made slag crack-resistant repairing agent of the invention is not added, and other conditions and component proportions are the same as those of example 1.
Example 6
The preparation method is basically the same as that of the example 1, except that the composite anti-cracking repairing agent is not added, and other conditions and component proportions are the same as those of the example 1.
Performance test
The concrete in examples 1 to 6 of the present invention was subjected to performance tests, and the test results are shown in tables 1 and 2:
detection method/test method
1. Reserved crack concrete compressive strength test
The reserved cracks refer to micro cracks which are artificially arranged in the concrete cubic compression-resistant test piece and have regular shapes and uniform sizes. The width, the length and the depth of the crack can be controlled, so that the comparability of the self-repairing performance of the concrete can be enhanced. The reserved cracks have great influence on the compressive strength of the concrete, the cracks have certain self-repairing capacity in the curing process, and the compressive strength of the concrete can reflect the repairing degree of the reserved cracks.
In the test, a plastic plate with the thickness of 0.2mm is fixed in a test die in advance, a test piece is molded and finally solidified, and then the molded plastic plate is drawn out to form a reserved crack, wherein the size of the concrete test piece is 100mm multiplied by 100mm, the length of the crack is 100mm, the width of the crack is 0.2mm, and the depth of the crack is 50 mm. Carrying out compressive strength tests on the concrete test pieces after the concrete test pieces are subjected to standard maintenance for 3 days, 7 days, 28 days and 56 days respectively, wherein the direction of the reserved crack and the loading direction are on the same straight line during loading;
2. secondary anti-seepage pressure detection
The concrete impermeability can reflect the internal structure of the concrete and can be used as a measurement index for measuring the self-repairing effect of the concrete. The test researches the concrete permeation resistance pressure of the invention through a concrete permeation resistance pressure test and a secondary permeation resistance pressure test. The anti-seepage pressure can reflect the restoration capability of the inherent capillary holes and the micro cracks of the concrete, when the upper surface of the concrete anti-seepage test piece is permeable, the internal pores of the concrete are in a communicated state, and after a certain period of maintenance, the communicated pores can be healed to a certain extent. The secondary impervious pressure can reflect the repairing effect of the concrete after being punctured by water. The test process refers to a test method of secondary seepage pressure resistance provided in GB 18445-2001 cement-based permeable crystalline waterproof material;
3. SEM analysis was conducted by chiseling the concrete in example 1 after 3 days and 28 days of curing.
TABLE 1 compression Strength test results for concrete with reserved cracks
TABLE 2 results of the impermeability pressure test
The performance of the examples 1 to 3 is compared, wherein the compressive strength and the secondary permeation resistance pressure in the example 3 are optimal, because the proportion of the added materials in the example 3 is the highest, and the technical scheme of the application is reflected from the side surface to be practicable.
Comparing the performances of the example 1 and the example 4, the compressive strength and the secondary permeation resistance pressure are reduced because the self-repairing filler of the invention is not added in the example 4, so that the addition of the self-repairing filler of the invention can improve the crack resistance and the self-repairing performance of the concrete, and the technical scheme of the example 4 can be implemented by reflecting from the side.
Comparing the performances of the example 1 and the example 5, the self-made slag crack-resistant repairing agent of the invention is not added in the example 5, so that the compressive strength and the permeation resistance are reduced, and therefore, the addition of the self-made slag crack-resistant repairing agent of the invention can improve the crack-resistant self-repairing performance of concrete, and the technical scheme of the example 5 is reflected from the side surface to be implemented.
Comparing the performances of the example 1 and the example 6, the compressive strength and the permeation resistance pressure are reduced because the example 6 is not added with the composite anti-cracking repairing agent, so that the addition of the composite anti-cracking repairing agent can improve the anti-cracking self-repairing performance of the concrete, and the technical scheme of the example 6 is reflected from the side face to be implementable.
Referring to fig. 1 to 4, scanning electron micrographs obtained by SEM analysis of concrete samples in example 1 after being respectively chiseled after curing for 3 days and 28 days are shown, and as can be seen from comparison of the scanning electron micrographs, the concrete samples in the reserved cracks are chiseled after curing for 3d and 28d, and the concrete fragments in the reserved cracks are taken for SEM analysis. As can be seen from figures 1 and 2, the cured 3d concrete is not completely hydrated, a large number of holes and micro cracks exist in the concrete, and the connection between crystal grains is weak and discontinuous. As can be seen from figures 3 and 4, the concrete after being cured for 28 days has improved compactness, obviously increased hydration products and fewer holes and micro-cracks, and the concrete of the invention can repair the cracks by self.
Comparative example 1
The preparation method was substantially the same as that of example 1 except that no ethylenediaminetetraacetic acid of the present invention was added, and other conditions and component ratios were the same as those of example 1.
Comparative example 2
The preparation process is essentially the same as in example 1, except that the sodium aluminosilicate of the invention is not added, and the other conditions and component ratios are the same as in example 1.
Comparative example 3
The preparation was carried out in essentially the same manner as in example 1, except that the shell powder of the invention was not added, and the other conditions and the proportions of the components were the same as in example 1.
Performance test
The concrete in comparative examples 1 to 3 of the present invention was subjected to performance tests, and the test results are shown in tables 3 and 4:
detection method/test method
1. Reserved crack concrete compressive strength test
The reserved cracks refer to micro cracks which are artificially arranged in the concrete cubic compression-resistant test piece and have regular shapes and uniform sizes. The width, the length and the depth of the crack can be controlled, so that the comparability of the self-repairing performance of the concrete can be enhanced. The reserved cracks have great influence on the compressive strength of the concrete, the cracks have certain self-repairing capacity in the curing process, and the compressive strength of the concrete can reflect the repairing degree of the reserved cracks.
In the test, a plastic plate with the thickness of 0.2mm is fixed in a test die in advance, a test piece is molded and finally solidified, and then the molded plastic plate is drawn out to form a reserved crack, wherein the size of the concrete test piece is 100mm multiplied by 100mm, the length of the crack is 100mm, the width of the crack is 0.2mm, and the depth of the crack is 50 mm. Carrying out compressive strength tests on the concrete test pieces after the concrete test pieces are subjected to standard maintenance for 3 days, 7 days, 28 days and 56 days respectively, wherein the direction of the reserved crack and the loading direction are on the same straight line during loading;
2. secondary anti-seepage pressure detection
The concrete impermeability can reflect the internal structure of the concrete and can be used as a measurement index for measuring the self-repairing effect of the concrete. The test researches the concrete permeation resistance pressure of the invention through a concrete permeation resistance pressure test and a secondary permeation resistance pressure test. The anti-seepage pressure can reflect the restoration capability of the inherent capillary holes and the micro cracks of the concrete, when the upper surface of the concrete anti-seepage test piece is permeable, the internal pores of the concrete are in a communicated state, and after a certain period of maintenance, the communicated pores can be healed to a certain extent. The secondary impervious pressure can reflect the repairing effect of the concrete after being punctured by water. The test process refers to a test method of secondary seepage pressure resistance provided in GB 18445-2001 cement-based permeable crystalline waterproof material;
TABLE 3 test results of compressive strength of concrete with reserved cracks in comparison example
TABLE 2 results of the permeation pressure resistance test of the control example
Comparing the test data in comparative example 1 with the test data in example 1; the compressive strength and the secondary anti-seepage pressure are obviously reduced because the EDTA is not added in the comparative example 1, so that after cracks are generated in the concrete, the external water infiltrates and the EDTA carrying an active chemical component infiltrates into the gaps of the concrete, and because the EDTA capable of complexing calcium ions in the concrete material generates a soluble complex, the EDTA permeates into the concrete under the action of concentration difference and chemical potential, and chemical conversion occurs when encountering free silicate ions, the calcium ions are taken away to generate more stable hydrated calcium silicate gel, and the chemical conversion easily occurs in the gaps and cracks, and the conversion product fills the cracks. In addition, the process can consume a cement hydration product calcium hydroxide, so that the secondary hydration of unhydrated cement in the concrete is promoted, the healing of concrete cracks is facilitated, and the anti-cracking self-repairing effect of the concrete is further improved.
Comparing the test data in comparative example 2 with the test data in example 1; the sodium aluminosilicate of the invention is not added in the comparative example 2, so that the compressive strength and the secondary anti-seepage pressure are both obviously reduced, therefore, the addition of the sodium aluminosilicate of the invention can carry out alkaline excitation catalysis on the sulfate in the slag and the phosphogypsum to generate hydration reaction, tricalcium aluminate hydrate and calcium silicate hydrate gel are generated firstly, the tricalcium aluminate hydrate and the phosphogypsum dihydrate are subjected to secondary reaction again in the sodium aluminosilicate to generate ettringite with higher strength, the hydration product generated by the hydration reaction forms a layer of space network structure on the surface of the phosphogypsum, the calcium silicate hydrate gel and the ettringite generated are gradually increased along with the progress of the hydration reaction, the formed network structure is more compact, the gaps are reduced, the strength is improved, and the anti-cracking repair effect of the inner gaps of the filled concrete is achieved;
comparing the test data in comparative example 3 with the test data in example 1; the comparative example 3 does not add the shell powder of the invention, so that the compressive strength and the secondary permeation resistance pressure are both obviously reduced, and therefore, the addition of the shell powder of the invention can enable carbon dioxide and water generated by microorganisms to react with calcium carbonate in the shell powder, so that the shell powder is dissolved into a calcium bicarbonate solution, the calcium bicarbonate solution is absorbed into the microcracks under the capillary action of the microcracks, and the calcium bicarbonate is redeposited to form calcium carbonate crystals under the action of heat generated by metabolism of the microorganisms, so that the microcracks are plugged, and the self-repairing effect of concrete cracks is achieved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The crack-resistant self-repairing concrete is characterized in that: the paint comprises the following components in parts by weight:
55-65 parts of ordinary portland cement;
15-20 parts of composite anti-cracking repair filler;
50-60 parts of expanded perlite;
200-250 parts of water;
the composite anti-cracking repair filler is prepared by mixing a self-made repair filler and fine shell powder materials in proportion;
the self-made repair filler is prepared by mixing and reacting zeolite, tryptone, yeast extract, sucrose, calcium chloride solution, bacillus cereus liquid and arabic gum liquid.
2. The crack-resistant self-repairing concrete according to claim 1, characterized in that: the paint comprises the following components in parts by weight:
55-65 parts of ordinary portland cement;
15-20 parts of composite anti-cracking repair filler;
10-15 parts of a self-made slag crack-resistant repairing agent;
50-60 parts of expanded perlite;
200-250 parts of water;
the self-made slag crack-resistant repairing agent comprises coarse slag and phosphogypsum.
3. The crack-resistant self-repairing concrete according to claim 2, characterized in that: the paint comprises the following components in parts by weight:
55-65 parts of ordinary portland cement;
15-20 parts of composite anti-cracking repair filler;
10-15 parts of a self-made slag crack-resistant repairing agent;
50-60 parts of expanded perlite;
200-250 parts of water;
the self-made slag crack-resistant repairing agent comprises coarse slag, phosphogypsum and sodium aluminosilicate.
4. The crack-resistant self-repairing concrete according to claim 2, characterized in that: the paint comprises the following components in parts by weight:
55-65 parts of ordinary portland cement;
15-20 parts of composite anti-cracking repair filler;
10-15 parts of a self-made slag crack-resistant repairing agent;
3-5 parts of ethylene diamine tetraacetic acid;
50-60 parts of expanded perlite;
200-250 parts of water.
5. The crack-resistant self-repairing concrete according to any one of claims 1 to 4, which is characterized in that: the preparation steps of the composite anti-crack repair filler are as follows:
(1) weighing 40-50 parts of zeolite, 5-6 parts of tryptone, 2-3 parts of yeast extract, 1-2 parts of sucrose and 150-180 parts of calcium chloride solution with the mass fraction of 10%, mixing, placing on a shaking table, shaking and dipping for 40-60 min, and filtering to obtain a filter cake, namely the pretreated zeolite;
(2) mixing the above pretreated zeolite with a concentration of 107Mixing cfu/mL bacillus cereus liquid according to a mass ratio of 1:10, standing and enriching for 24h at 37 ℃, obtaining bacterium-carrying zeolite after enrichment is finished, mixing and stirring the bacterium-carrying zeolite and 15% acacia gum liquid according to a mass ratio of 1:10 for 40-50 min, filtering after reaction is finished to obtain filter residue, and naturally drying to obtain the self-made repair filler;
(3) and mixing the self-made repair filler and the fine shell powder material according to the mass ratio of 1:3 to obtain the composite anti-cracking repair filler.
6. The crack-resistant self-repairing concrete according to claim 3, characterized in that: the self-made slag crack-resistant repairing agent is prepared by the following steps:
(1) collecting waste slag generated after blast furnace ironmaking, sieving with a 50-mesh sieve, and collecting to obtain slag coarse material;
(2) and mixing the obtained slag coarse material, phosphogypsum and sodium aluminosilicate according to the mass ratio of 10:17:1 to obtain the self-made slag crack resistance repairing agent.
7. The crack-resistant self-repairing concrete according to claim 4, characterized in that: the concrete preparation steps of the crack-resistant self-repairing concrete are as follows:
weighing 55-65 parts of ordinary portland cement, 15-20 parts of composite anti-cracking repairing filler, 10-15 parts of self-made slag anti-cracking repairing agent, 3-5 parts of ethylenediamine tetraacetic acid, 50-60 parts of expanded perlite and 200-250 parts of water in parts by weight, sequentially loading into a stirring truck, stirring at the rotating speed of 70-80 r/min at the temperature of 45-55 ℃ for 4-5 min, and discharging to obtain the anti-cracking self-repairing concrete.
8. The crack-resistant self-repairing concrete according to claim 5, characterized in that: the mesh number of the fine materials of the shell powder crushed material is 100 meshes.
9. The crack-resistant self-repairing concrete according to claim 6, characterized in that: the mesh number of the slag coarse material is 50 meshes.
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