CN114988775A - Self-repairing high-performance concrete - Google Patents
Self-repairing high-performance concrete Download PDFInfo
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- CN114988775A CN114988775A CN202210709111.4A CN202210709111A CN114988775A CN 114988775 A CN114988775 A CN 114988775A CN 202210709111 A CN202210709111 A CN 202210709111A CN 114988775 A CN114988775 A CN 114988775A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/02—Making microcapsules or microballoons
- B01J13/04—Making microcapsules or microballoons by physical processes, e.g. drying, spraying
- B01J13/043—Drying and spraying
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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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0675—Macromolecular compounds fibrous from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0691—Polyamides; Polyaramides
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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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/06—Oxides, Hydroxides
- C04B22/062—Oxides, Hydroxides of the alkali or alkaline-earth metals
- C04B22/064—Oxides, Hydroxides of the alkali or alkaline-earth metals of the alkaline-earth metals
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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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/10—Acids or salts thereof containing carbon in the anion
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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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2652—Nitrogen containing polymers, e.g. polyacrylamides, polyacrylonitriles
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/281—Polyepoxides
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/282—Polyurethanes; Polyisocyanates
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The application relates to the field of concrete, and particularly discloses self-repairing high-performance concrete. The self-repairing high-performance concrete comprises the following raw materials in parts by weight: 60-80 parts of cement, 90-120 parts of fine sand, 250 parts of gravel, 30-40 parts of water, 15-20 parts of spandex filament, 10-15 parts of polyurethane adhesive, 10-15 parts of calcium oxide and 2-3 parts of water reducing agent, wherein the polyurethane adhesive and the calcium oxide are respectively sealed and arranged in the glass fiber tube. After the concrete cracks, the glass fiber tube cracks, the polyurethane adhesive flows out to repair the concrete crack, and meanwhile, water and calcium oxide react to release heat, the spandex filament is heated to shrink, the contact area of the polyurethane adhesive and the concrete crack is increased, the self-repairing effect of the concrete is improved, so that the concrete is not prone to secondary cracking, the repair is more timely, the cost is lower, and the development requirement of modern building economy can be met.
Description
Technical Field
The present application relates to the field of concrete, and more particularly, it relates to a self-repairing high performance concrete.
Background
Concrete is a cement-based composite material which is uneven, porous and brittle, and is also the most used building material in the world today.
The concrete is very easy to generate micro cracks in the construction or long-term use process, if the micro cracks can not be repaired in time, the normal use of the concrete is influenced, the service life of a building is shortened, macro cracks are caused, brittle fracture occurs, serious construction and building accidents occur, and economic loss which is difficult to recover is caused to the society.
The concrete is usually repaired by adopting a mode of regular maintenance and after-repair, but the cost is higher, the effect is not good, the development requirement of the economy of modern buildings cannot be met, and the improvement is needed.
Disclosure of Invention
In order to improve the problem that the cost of concrete repair is higher and the effect is not good, the self-repairing high performance concrete is provided.
The self-repairing high-performance concrete adopts the following technical scheme:
the self-repairing high-performance concrete comprises the following raw materials in parts by weight: 60-80 parts of cement, 90-120 parts of fine sand, 250 parts of gravel, 30-40 parts of water, 15-20 parts of spandex filament, 10-15 parts of polyurethane adhesive, 10-15 parts of calcium oxide and 2-3 parts of water reducing agent, wherein the polyurethane adhesive and the calcium oxide are respectively sealed and arranged in a glass fiber tube.
By adopting the technical scheme, after the concrete cracks, the glass fiber tube positioned at the cracking position cracks, and the polyurethane adhesive in the glass fiber tube flows out to fill the crack so as to repair the cracking position of the concrete.
The spandex silk has better elasticity, can improve the holistic toughness of concrete after mixing for the difficult fracture that takes place of concrete pressurized, and when the concrete fracture, the fracture department of part spandex silk connection concrete reduces cracked initial width, still can restrain cracked expansion, so that the solidification of polyurethane gluing agent is restoreed.
When the concrete ftractures, the glass fiber tube fracture of calcium oxide is equipped with in part, make the calcium oxide spill over, contain water in the polyurethane adhesive, water and calcium oxide contact take place to react exothermic, make the spandex silk be heated and take place the shrink, make the crack narrow, under the limited or great condition of crack width of the polyurethane adhesive that flows out, increase polyurethane adhesive and concrete fissured area of contact, the bonding effect of polyurethane adhesive has been improved, make the difficult secondary fracture that takes place of restoration department of concrete, thereby the selfreparing effect of concrete has been improved, it is more timely to restore, and for periodic maintenance, the cost is cheaper, can more satisfy the development demand of modern building economy.
Preferably, the raw materials further comprise 4-6 parts by weight of sodium bicarbonate, and the sodium bicarbonate and the polyurethane adhesive are sealed and arranged in the glass fiber tube after being mixed.
Through adopting above-mentioned technical scheme, sodium bicarbonate among the polyurethane adhesive receives the heat that calcium oxide and water reaction produced to take place to decompose and produce sodium carbonate, carbon dioxide and water, and carbon dioxide and calcium hydroxide reaction generate calcium carbonate and promote the crack to repair, and simultaneously, the carbon dioxide spills over and turns over the polyurethane adhesive for the contact of polyurethane adhesive and calcium oxide promotes more calcium oxide and water reaction, increases the shrink effect of spandex silk.
After the polyurethane adhesive fills the cracks, part of Ca contained in the concrete 2+ Dissolved in the polyurethane adhesive, Ca 2+ Reacting with sodium bicarbonate/sodium carbonate contained in polyurethane adhesive to generate calcium carbonate to further repair cracks, and the other part of Ca 2+ Polyurethane rubberThe moisture in the adhesive permeates into the interior of the adhesive and reacts with sodium bicarbonate/sodium carbonate positioned in the polyurethane adhesive to generate calcium carbonate, so that the polyurethane adhesive undergoes surface expansion, the contact between the polyurethane adhesive and the concrete crack is further increased, and the self-repairing effect of the concrete is better.
Preferably, the raw materials also comprise 2-4 parts of bacillus by weight.
By adopting the technical scheme, the bacillus has good adaptability to the high-alkalinity environment in the concrete, the bacillus is in a dormant state in a dry environment, and after the concrete cracks, the bacillus is activated by contacting oxygen and water to promote the deposition of calcium carbonate, so that the repair of the concrete cracks is further promoted.
Preferably, the raw materials further comprise 20-30 parts of diatomite by weight, and when the bacillus subtilis is used, the bacillus subtilis and the nutrient solution are mixed to prepare a bacterial suspension, and then the diatomite is added for ultrasonic stirring and then is dried for later use.
By adopting the technical scheme, the diatomite is used for loading the bacillus, the bacillus is protected when the concrete is stirred and mixed, the damage of other raw materials to the bacillus is reduced, and the survival rate of the bacillus is improved.
Preferably, the mass ratio of the bacillus to the nutrient solution is 3: 2, according to the weight part of the bacillus, the nutrient solution comprises 40-50 parts of water, 20-25 parts of urea, 0.5-1 part of yeast extract, 10-15 parts of calcium compound, 0.05-0.1 part of 3, 5-dinitrobenzyl alcohol and 0.02-0.08 part of sodium trimetaphosphate.
By adopting the technical scheme, the nutrient substances are fixed on the diatomite, so that the nutrient substances can be prevented from flowing into a concrete matrix in the concrete preparation and maintenance processes, the effective utilization rate of the nutrient substances is increased, and the interference on crack repair is reduced.
Preferably, the raw materials further comprise 10-15 parts of mica powder by weight.
By adopting the technical scheme, the mica powder has a lamellar structure, and after the mica powder is uniformly mixed, the glass fiber pipe filled with the calcium oxide/polyurethane adhesive can be separated and lifted by utilizing the structure of the mica powder, so that the stacking and deposition of the glass fiber pipe filled with the calcium oxide/polyurethane adhesive are inhibited, and the uniformity of the overall concrete repair effect is improved.
Preferably, the raw materials further comprise 15-20 parts of steel fibers by weight, and the length of the steel fibers is 1-5 mm.
Through adopting above-mentioned technical scheme, steel fiber has good intensity, can improve the bulk strength of concrete after mixing, and when the concrete fracture, because steel fiber length is shorter and difficult emergence fracture, at the section department that the concrete splits, some steel fiber can stretch out the section and stretch into polyurethane adhesive, has improved the connection fastness between polyurethane adhesive and the concrete, has further reduced the probability that the secondary fracture takes place for the concrete.
Preferably, the raw materials further comprise 8-12 parts by weight of calcium sulfoaluminate capsules, and the preparation method of the calcium sulfoaluminate capsules comprises the following steps: granulating 50-60 parts of calcium sulphoaluminate and drying for later use, dissolving 70-90 parts of water-based epoxy resin and 30-50 parts of polyacrylamide in water at 70-80 ℃ to form a soaking solution, then soaking the prepared calcium sulphoaluminate in the soaking solution for 20-30min, taking out, and drying at 60-80 ℃ for 6-8h to obtain the calcium sulphoaluminate capsule.
By adopting the technical scheme, the concrete is alkaline, the water-based epoxy resin and the polyacrylamide are dissolved in the stirring process, the direct contact between calcium sulphoaluminate and the concrete is reduced, the water absorption of the calcium sulphoaluminate is inhibited, after the concrete is preformed and shaped, the water-based epoxy resin and the polyacrylamide on the surface of the calcium sulphoaluminate are completely dissolved or a small amount of water-based epoxy resin and the polyacrylamide are remained, after the concrete cracks, an alkaline solution is formed in the crack, the water-based epoxy resin and the polyacrylamide on the surface of the calcium sulphoaluminate are further dissolved, so that the calcium sulphoaluminate overflows or the calcium sulphoaluminate directly contacts with the alkaline solution, the water absorption of the calcium sulphoaluminate expands, the blockage is formed at the crack, the condition that the polyurethane adhesive overflows the crack is inhibited, and the filling effect of the polyurethane adhesive on the crack is improved.
In summary, the present application has the following beneficial effects:
1. because this application adopts the polyurethane fibre silk, sealed polyurethane adhesive and the calcium oxide of adorning in the glass fiber pipe, the concrete takes place the fracture back, glass fiber pipe break off, polyurethane adhesive flows and restores concrete fracture department, and simultaneously, water and calcium oxide reaction are exothermic, and polyurethane fibre silk thermal contraction increases polyurethane adhesive and concrete fissured area of contact, has improved the selfreparing effect of concrete for the difficult secondary fracture that takes place of concrete, and it is more timely to restore, and the cost is cheaper.
2. Preferred adoption sodium bicarbonate in this application, sodium bicarbonate are heated decomposition and are produced sodium carbonate, carbon dioxide and water, promote the crack and restore, and simultaneously, the carbon dioxide overflows the polyurethane adhesive that turns over for the contact of polyurethane adhesive and calcium oxide, the shrink effect of increase spandex silk, Ca 2+ The polyurethane adhesive reacts with sodium bicarbonate/sodium carbonate in the polyurethane adhesive to generate surface expansion, so that the contact between the polyurethane adhesive and the concrete crack is further increased, and the self-repairing effect of the concrete is better.
3. The calcium sulphoaluminate capsule is preferably adopted in the application, after the concrete is cracked, the calcium sulphoaluminate absorbs water and expands, a barrier is formed at the crack, the condition that the polyurethane adhesive overflows the crack is inhibited, and the filling effect of the polyurethane adhesive on the crack is improved.
Detailed Description
The present application will be described in further detail with reference to examples.
The raw materials used in the following embodiments may be those conventionally commercially available unless otherwise specified.
Preparation examples of raw materials
Preparation example 1
Preparing calcium sulphoaluminate capsules: 50g of calcium sulphoaluminate is granulated and dried for later use, 70g of water-based epoxy resin and 30g of polyacrylamide are dissolved in water at 70 ℃ to form a soaking solution, then 50g of the prepared calcium sulphoaluminate is soaked in the soaking solution for 30min and then taken out, and the calcium sulphoaluminate capsule is prepared after drying for 8h at 60 ℃.
Preparation example 2
Preparing calcium sulphoaluminate capsules: granulating 60g of calcium sulphoaluminate and drying for later use, dissolving 90g of water-based epoxy resin and 50g of polyacrylamide in water at 80 ℃ to form a soaking solution, then soaking 60g of the calcium sulphoaluminate for later use in the soaking solution for 20min, taking out, and drying at 80 ℃ for 6h to obtain the calcium sulphoaluminate capsule.
Preparation example 3
Preparing calcium sulphoaluminate capsules: and granulating 55g of calcium sulphoaluminate and drying for later use, dissolving 80g of water-based epoxy resin and 40g of polyacrylamide in 75 ℃ water to form a soaking solution, soaking 55g of the calcium sulphoaluminate for later use in the soaking solution for 25min, taking out, and drying at 70 ℃ for 7h to obtain the calcium sulphoaluminate capsule.
Preparation example 4
Preparing a nutrient solution: 40g of water, 20g of urea, 0.5g of yeast extract, 10g of calcium compound, 0.05g of 3, 5-dinitrobenzyl alcohol and 0.02g of sodium trimetaphosphate are mixed uniformly to prepare the nutrient solution.
Preparation example 5
Preparing a nutrient solution: 50g of water, 25g of urea, 1g of yeast extract, 15g of calcium compound, 0.1g of 3, 5-dinitrobenzyl alcohol and 0.08g of sodium trimetaphosphate are mixed uniformly to prepare the nutrient solution.
Preparation example 6
Preparing a nutrient solution: 45g of water, 25g of urea, 0.7g of yeast extract, 12g of calcium compound, 0.08g of 3, 5-dinitrobenzyl alcohol and 0.06g of sodium trimetaphosphate are mixed uniformly to prepare the nutrient solution.
Examples
Example 1
The application discloses selfreparing high-performance concrete, including following raw materials: cement, fine sand, stones, water, spandex filaments, a polyurethane adhesive, calcium oxide and a water reducing agent, wherein the content of each component is shown in the following table 1-1.
The preparation method of the self-repairing high-performance concrete comprises the following steps:
after the polyurethane adhesive is filled into the glass fiber tube, the two ends of the glass fiber tube are heat-sealed, so that the polyurethane adhesive is hermetically arranged in the glass fiber tube, in addition, after calcium oxide is filled into the glass fiber tube, the two ends of the glass fiber tube are heat-sealed, so that the calcium oxide is hermetically arranged in the glass fiber tube, then cement, fine sand, stones, spandex filaments, the polyurethane adhesive hermetically arranged in the glass fiber tube and the calcium oxide hermetically arranged in the glass fiber tube are uniformly stirred, then water and a water reducing agent are added, and the concrete is uniformly stirred, so that the concrete is prepared.
Example 2
The difference from example 1 is that the contents of the respective components are different, and the contents of the respective components are shown in the following table 1-1.
Example 3
The difference from example 1 is that the contents of the respective components are different, and the contents of the respective components are shown in the following table 1-1.
Example 4
The difference from example 1 is that sodium bicarbonate was added to the raw material, and the contents of the respective components are shown in the following table 1-1.
The preparation method of the self-repairing high-performance concrete comprises the following steps:
uniformly stirring and filling the polyurethane adhesive and sodium bicarbonate into a glass fiber tube, then thermally sealing two ends of the glass fiber tube to enable the polyurethane adhesive to be sealed and filled in the glass fiber tube, filling calcium oxide into the glass fiber tube, thermally sealing two ends of the glass fiber tube to enable the calcium oxide to be sealed and filled in the glass fiber tube, then uniformly stirring cement, fine sand, stone, spandex filaments, the polyurethane adhesive sealed and filled in the glass fiber tube and the calcium oxide sealed and filled in the glass fiber tube, then adding water and a water reducing agent, and uniformly stirring to obtain the concrete.
Example 5
The difference from example 1 is that Bacillus was added to the raw material and the contents of the components are shown in the following Table 1-1.
The preparation method of the self-repairing high-performance concrete comprises the following steps:
after the polyurethane adhesive is filled into the glass fiber tube, two ends of the glass fiber tube are heat-sealed, so that the polyurethane adhesive is hermetically arranged in the glass fiber tube, calcium oxide is filled into the glass fiber tube, two ends of the glass fiber tube are heat-sealed, so that the calcium oxide is hermetically arranged in the glass fiber tube, then cement, fine sand, cobblestones, spandex filaments, bacillus, the polyurethane adhesive hermetically arranged in the glass fiber tube and the calcium oxide hermetically arranged in the glass fiber tube are uniformly stirred, water and a water reducing agent are added, and the concrete is prepared.
Example 6
The difference from example 5 is that diatomaceous earth was added to the raw materials, and the contents of the components are shown in the following table 1-1.
The preparation method of the self-repairing high-performance concrete comprises the following steps:
and (3) mixing the following components in percentage by mass: 2 to prepare a bacterial suspension, adding diatomite, stirring for 30min by ultrasonic waves, and drying at 40 ℃ for later use, wherein the nutrient solution is prepared by the preparation example 1.
After the polyurethane adhesive is filled into the glass fiber tube, two ends of the glass fiber tube are heat-sealed, so that the polyurethane adhesive is hermetically arranged in the glass fiber tube, calcium oxide is filled into the glass fiber tube, two ends of the glass fiber tube are heat-sealed, so that the calcium oxide is hermetically arranged in the glass fiber tube, then the mixture of cement, fine sand, cobblestone, spandex filament, bacillus, spare bacillus and diatomite, the polyurethane adhesive hermetically arranged in the glass fiber tube and the calcium oxide hermetically arranged in the glass fiber tube are uniformly stirred, water and a water reducing agent are added and uniformly stirred, and the concrete is prepared.
Example 7
The difference from example 1 is that mica powder is added to the raw materials, and the contents of the components are shown in the following table 1-1.
The preparation method of the self-repairing high-performance concrete comprises the following steps:
and then uniformly stirring the cement, the fine sand, the pebbles, the spandex filaments, the mica powder, the polyurethane adhesive hermetically arranged in the glass fiber tube and the calcium oxide hermetically arranged in the glass fiber tube, adding water and the water reducing agent, and uniformly stirring to obtain the concrete.
Example 8
The difference from example 1 is that steel fiber is added to the raw material, and the contents of the respective components are shown in the following table 1-1.
The preparation method of the self-repairing high-performance concrete comprises the following steps:
and then uniformly stirring cement, fine sand, stones, spandex filaments, steel fibers, the polyurethane adhesive hermetically arranged in the glass fiber tube and the calcium oxide hermetically arranged in the glass fiber tube, adding water and a water reducing agent, and uniformly stirring to obtain the concrete.
Example 9
The difference from example 1 is that calcium sulfoaluminate capsules, the contents of each component of which are shown in the following table 1-1, were added to the raw materials, and the calcium sulfoaluminate capsules were prepared by preparation example 1.
The preparation method of the self-repairing high-performance concrete comprises the following steps:
after the polyurethane adhesive is filled into the glass fiber tube, the two ends of the glass fiber tube are heat-sealed, so that the polyurethane adhesive is sealed and filled in the glass fiber tube, in addition, after calcium oxide is filled into the glass fiber tube, the two ends of the glass fiber tube are heat-sealed, so that the calcium oxide is sealed and filled in the glass fiber tube, then cement, fine sand, stones, spandex filaments, calcium sulphoaluminate capsules, the polyurethane adhesive sealed and filled in the glass fiber tube and the calcium oxide sealed and filled in the glass fiber tube are uniformly stirred, and then water and a water reducing agent are added and uniformly stirred, so that the concrete is prepared.
Example 10
The application discloses selfreparing high-performance concrete, including following raw materials: cement, fine sand, pebbles, water, spandex filaments, polyurethane adhesives, calcium oxide, a water reducing agent, bacillus, diatomite, mica powder, steel fibers and calcium sulfoaluminate capsules, wherein the content of each component is shown in the following table 1-1.
The preparation method of the self-repairing high-performance concrete comprises the following steps:
and (3) mixing the following components in percentage by mass: 2 to prepare a bacterial suspension, adding diatomite, stirring for 30min by ultrasonic waves, and drying at 40 ℃ for later use, wherein the nutrient solution is prepared by the preparation example 1.
Uniformly stirring and filling the polyurethane adhesive and sodium bicarbonate into a glass fiber tube, then heat-sealing two ends of the glass fiber tube to seal and install the polyurethane adhesive in the glass fiber tube, filling calcium oxide into the glass fiber tube, then heat-sealing two ends of the glass fiber tube to seal and install the calcium oxide in the glass fiber tube, then uniformly stirring cement, fine sand, stones, spandex filaments, the polyurethane adhesive hermetically installed in the glass fiber tube, the calcium oxide, mica powder, steel fibers and calcium sulfoaluminate capsules hermetically installed in the glass fiber tube, then adding water and a water reducing agent, and uniformly stirring to obtain the concrete.
Example 11
The application discloses selfreparing high-performance concrete, including following raw materials: cement, fine sand, cobblestone, water, spandex filament, polyurethane adhesive, calcium oxide, water reducing agent, bacillus, diatomite, mica powder, steel fiber and calcium sulphoaluminate capsule, wherein the content of each component is shown in the following table 1-2.
The preparation method of the self-repairing high-performance concrete comprises the following steps:
and (3) mixing the following components in percentage by mass: 2 to prepare a bacterial suspension, adding diatomite, stirring for 30min by ultrasonic waves, and drying at 40 ℃ for later use, wherein the nutrient solution is prepared by the preparation example 2.
The concrete is prepared by uniformly stirring and then uniformly mixing the polyurethane adhesive and sodium bicarbonate, then putting the mixture into a glass fiber tube, thermally sealing two ends of the glass fiber tube to enable the polyurethane adhesive to be sealed and arranged in the glass fiber tube, additionally, after calcium oxide is arranged in the glass fiber tube, thermally sealing two ends of the glass fiber tube to enable the calcium oxide to be sealed and arranged in the glass fiber tube, then uniformly stirring cement, fine sand, stones, spandex filaments, the polyurethane adhesive sealed and arranged in the glass fiber tube, the calcium oxide, mica powder, steel fibers and calcium sulphoaluminate capsules sealed and arranged in the glass fiber tube, then, adding water and a water reducing agent, and uniformly stirring.
Example 12
The application discloses selfreparing high-performance concrete, including following raw materials: cement, fine sand, cobblestone, water, spandex filament, polyurethane adhesive, calcium oxide, water reducing agent, bacillus, diatomite, mica powder, steel fiber and calcium sulphoaluminate capsule, wherein the content of each component is shown in the following table 1-2.
The preparation method of the self-repairing high-performance concrete comprises the following steps:
and (3) mixing the following components in percentage by mass: 2 to prepare a bacterial suspension, adding diatomite, stirring for 30min by ultrasonic waves, and drying at 40 ℃ for later use, wherein the nutrient solution is prepared by the preparation example 3.
The concrete is prepared by uniformly stirring and then uniformly mixing the polyurethane adhesive and sodium bicarbonate, then putting the mixture into a glass fiber tube, thermally sealing two ends of the glass fiber tube to enable the polyurethane adhesive to be sealed and arranged in the glass fiber tube, additionally, after calcium oxide is arranged in the glass fiber tube, thermally sealing two ends of the glass fiber tube to enable the calcium oxide to be sealed and arranged in the glass fiber tube, then uniformly stirring cement, fine sand, stones, spandex filaments, the polyurethane adhesive sealed and arranged in the glass fiber tube, the calcium oxide, mica powder, steel fibers and calcium sulphoaluminate capsules sealed and arranged in the glass fiber tube, then, adding water and a water reducing agent, and uniformly stirring.
Example 13
The difference from example 4 is that sodium bicarbonate was replaced with sodium carbonate, and the contents of each component are shown in tables 1 to 2 below.
Example 14
The difference from example 7 is that mica powder is replaced by fly ash, and the contents of each component are shown in the following tables 1-2.
Example 15
The difference from example 8 is that the steel fiber is replaced with glass fiber, and the contents of the components are shown in the following tables 1 to 2.
Example 16
The difference from example 9 is that the calcium sulfoaluminate capsules were replaced with calcium sulfoaluminate, and the contents of the respective components are shown in tables 1 to 2 below.
Comparative example
Comparative example 1
The difference from example 1 is that the antibacterial polyethylene material without polyvinyl acetal adhesive, spandex filament and calcium oxide added in the raw materials is used as a blank control group.
Comparative example 2
The difference from example 1 is that spandex filament is replaced with glass fiber, and the contents of each component are shown in tables 1-2 below.
Comparative example 3
The difference from example 1 is that calcium oxide was not added and the contents of the respective components are shown in the following tables 1 to 2.
Comparative example 4
The difference from comparative example 2 is that calcium oxide was not added and the contents of the respective components are shown in tables 1 to 2 below.
TABLE 1-1 ingredient content Table (unit: g)
TABLE 1-2 ingredient content Table (unit: g)
Performance test
(1) And (3) testing the repairing performance: the concrete obtained in examples 1 to 16 and comparative examples 1 to 4 was poured and molded, then left to stand for 48 hours, demolded, and maintained at a humidity of 85. + -. 5% RH and a temperature of 22. + -. 2 ℃ for 7 days, and then cracks were preformed to obtain test pieces.
Prefabricating a crack: according to the standard GB/T50081-2002 standard for testing mechanical properties of common concrete, the compressive strength of the test pieces of the examples 1-16 and the comparative examples 1-4 is tested by using a universal compression testing machine, the speed of the compression testing machine is 0.04mm/min, the crack development conditions of the side surfaces of the test pieces are observed at the same time, and the width of the crack developed on the four side surfaces of each test piece after being compressed is measured and recorded.
Stopping loading when a crack with the width of 0.3-0.5mm appears on the side surface of the test piece, unloading after holding the load for 90s, selecting 3 cracks with the width of 0.3-0.5mm in each test piece after taking down the test piece, marking the test piece, then watering the test piece for maintenance, periodically measuring 3 cracks by adopting a crack observer, calculating the average width value of the 3 cracks, and obtaining the test result shown in the following table 2.
(2) Testing of adhesive property: cracks with the width of 3-4mm are prepared on the side surfaces of the test pieces of the examples 8 and 15, the inner walls of the cracks on the test pieces of the examples 8 and 15 are observed, the observed results are recorded, and the test results are as follows: the test piece of example 8 had a portion of the steel fiber ends protruding and lying within the crack on the inside wall of the crack, and the test piece of example 15 had glass fibers broken on the inside wall of the crack with end faces flush with the inside wall of the crack.
(3) And (3) anti-overflow test: when the cracks are prefabricated, the cracks are formed, the width is recorded, then the test piece is kept stand for 12 hours, the surfaces of the test pieces of the examples 9 and 16 are observed by adopting an electron scanning microscope, the phenomenon is recorded, and the test result is as follows: no glue solution overflows around the cracks on the surface of the test piece in the embodiment 9, and the glue solution overflows around the cracks on the surface of the test piece in the embodiment 16.
TABLE 2 test results of examples and comparative examples
In summary, the following conclusions can be drawn:
1. combining examples 1-3 and comparative examples 1-2 and combining table 2, it can be seen that the addition of spandex filament to concrete can improve the self-repair effect of concrete, which may be due to: the spandex yarn has better elasticity, can inhibit the expansion of cracks and promote the repair of concrete cracks.
2. Combining example 1 and comparative examples 2-4 with table 2, it can be seen that the combination of spandex filament and calcium oxide encapsulated in glass fiber tube in concrete can improve the self-repairing effect of concrete, probably because: when the concrete cracks, the glass fiber tube is broken, the calcium oxide overflows and reacts with water to release heat, so that the spandex filaments are heated to shrink, the cracks are narrowed, the contact area of the polyurethane adhesive and the concrete cracks is increased, and the self-repairing effect of the concrete is improved.
3. As can be seen from the combination of examples 1, 4 and 13 and table 2, the addition of sodium bicarbonate to concrete is beneficial to improving the self-repairing effect of concrete, and the reason may be that: sodium bicarbonate is heated and decomposed to generate sodium carbonate, carbon dioxide and water, the carbon dioxide and calcium hydroxide react to generate calcium carbonate to promote crack repair, meanwhile, the carbon dioxide overflows and turns over the polyurethane adhesive, the contact between the polyurethane adhesive and calcium oxide is accelerated, the shrinkage effect of spandex filaments is increased, and part of Ca 2+ The polyurethane adhesive reacts with sodium bicarbonate/sodium carbonate in the polyurethane adhesive to generate calcium carbonate, so that the polyurethane adhesive generates surface expansion, the contact between the polyurethane adhesive and the concrete crack is further increased, and the self-repairing effect of the concrete is comprehensively improved.
4. As can be seen from the combination of examples 1, 7 and 14 and table 2, the addition of mica powder to concrete can improve the self-repairing effect of concrete, which may be due to the following reasons: the mica powder has a lamellar structure, and after being uniformly mixed, the glass fiber tube filled with the calcium oxide/polyurethane adhesive can be separated and lifted, so that the stacking and deposition of the glass fiber tube filled with the calcium oxide/polyurethane adhesive are inhibited, and the overall repairing effect of the concrete is more uniform.
5. As can be seen from the combination of examples 1, 9 and 16, the addition of calcium thioaluminate capsules to concrete improves the self-healing effect of concrete, which may be due to: after the concrete cracks, the water-based epoxy resin and the polyacrylamide are dissolved, the calcium sulphoaluminate overflows and absorbs water to expand, the overflow of the polyurethane adhesive is reduced, and the filling effect of the polyurethane adhesive on the cracks is 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 (8)
1. The self-repairing high-performance concrete is characterized by comprising the following raw materials in parts by weight: 60-80 parts of cement, 90-120 parts of fine sand, 250 parts of gravel, 30-40 parts of water, 15-20 parts of spandex filament, 10-15 parts of polyurethane adhesive, 10-15 parts of calcium oxide and 2-3 parts of water reducing agent, wherein the polyurethane adhesive and the calcium oxide are respectively sealed and arranged in a glass fiber tube.
2. The self-repairing high performance concrete of claim 1, wherein: the raw materials also comprise 4-6 parts of sodium bicarbonate according to parts by weight, and the sodium bicarbonate and the polyurethane adhesive are sealed and arranged in the glass fiber tube after being mixed.
3. The self-repairing high performance concrete of claim 1, wherein: the raw materials also comprise 2-4 parts of bacillus by weight.
4. The self-repairing high performance concrete of claim 3, wherein: the raw materials also comprise 20-30 parts of diatomite by weight, when in use, bacillus and nutrient solution are mixed to prepare bacterial suspension, and then the diatomite is added for ultrasonic stirring and then is dried for standby.
5. The self-repairing high performance concrete of claim 1, wherein: the mass ratio of the bacillus to the nutrient solution is 3: 2, according to the weight part of the bacillus, the nutrient solution comprises 40-50 parts of water, 20-25 parts of urea, 0.5-1 part of yeast extract, 10-15 parts of calcium compound, 0.05-0.1 part of 3, 5-dinitrobenzyl alcohol and 0.02-0.08 part of sodium trimetaphosphate.
6. The self-repairing high performance concrete of claim 1, wherein: the raw materials also comprise 10-15 parts of mica powder by weight.
7. The self-healing high performance concrete of claim 1, wherein: the raw materials also comprise 15-20 parts of steel fibers according to parts by weight, and the length of the steel fibers is 1-5 mm.
8. The self-repairing high performance concrete of claim 1, wherein: the raw materials also comprise 8-12 parts of calcium sulphoaluminate capsules by weight, and the preparation method of the calcium sulphoaluminate capsules comprises the following steps: 50-60 parts of calcium sulphoaluminate are granulated and dried for later use, 70-90 parts of aqueous epoxy resin and 30-50 parts of polyacrylamide are dissolved in water at 70-80 ℃ to form a soaking solution, then the prepared calcium sulphoaluminate is soaked in the soaking solution for 20-30min and then taken out, and the calcium sulphoaluminate capsule is prepared after drying for 6-8h at 60-80 ℃.
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