CN115124270A - Layered adsorption type hydrotalcite mortar rust-resistant layer and preparation method and application thereof - Google Patents
Layered adsorption type hydrotalcite mortar rust-resistant layer and preparation method and application thereof Download PDFInfo
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/61—Corrosion inhibitors
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
- C04B2111/00525—Coating or impregnation materials for metallic surfaces
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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
- C04B2111/26—Corrosion of reinforcement resistance
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention relates to the field of reinforcing steel bar rust inhibitors, in particular to a layered adsorption type hydrotalcite mortar rust inhibitor layer and a preparation method and application thereof. Firstly, synthesizing hydrotalcite loaded rust inhibitor by adopting a coprecipitation method, wherein the hydrotalcite is calcium-aluminum hydrotalcite, and the intercalation rust inhibitor is benzotriazole and vitamin B6. And coating the mortar on the surface of the steel bar layer by layer, and adsorbing a hydrotalcite-loaded rust inhibitor with a certain content after coating each layer of the mortar. The hydrotalcite-loaded rust inhibitor is added into the mortar rust inhibitor layer in a layered adsorption manner, so that the problems of poor dispersibility and difficult migration of the hydrotalcite-loaded rust inhibitor in a cement-based material can be solved well, a more targeted gradient barrier and gradient chlorine fixation effect can be provided, and the advantage of rust inhibition from point to surface can be exerted.
Description
Technical Field
The invention relates to the field of reinforcing steel bar rust inhibitors, in particular to a layered adsorption type hydrotalcite mortar rust inhibitor layer and a preparation method and application thereof.
Background
The reinforced concrete structure is an indispensable part in various projects, and has the advantages of convenient construction, low cost, long service time and the like. With the increase of the service time of the reinforced concrete structure, the durability problem gradually appears. Among them, the corrosion of steel reinforcement caused by the corrosion of chloride ion is an important factor threatening the safety of concrete structure. The addition of the rust inhibitor into the concrete is a simple and direct measure for preventing the corrosion of the reinforcing steel bars. In addition, coating epoxy on the surface of the steel bar is also a common rust-resisting means.
However, the conventional rust inhibitor still faces some problems in the using process: firstly, in a newly poured reinforced concrete structure, the rust inhibitor is mixed into concrete in the mixing stage and uniformly dispersed in the whole structure, only a small amount of rust inhibitor near the surface of the steel bar can contact and act with the steel bar, and the rust inhibitor in the rest area is difficult to naturally migrate to the surface of the steel bar. Secondly, the current rust inhibitor also faces the problems of light control, passive rust inhibition, environmental leakage and the like. For common epoxy resin coatings, due to the fact that different matrix components have large differences, the problems that the interface bonding degree of the coatings and reinforcing steel bars and the interface bonding degree of the coatings and cement-based materials are poor and the like are faced, and the defects that the bonding force is poor, the interface gap is large and the like are caused.
In concrete or organic coatings, the rust inhibitor is generally uniformly incorporated into the base during the blending stage, in which the poorly soluble rust inhibitor is prone to agglomeration, and in which the rust inhibitor remains in the spot-to-spot region, resulting in some rust inhibitor "holes".
In view of the wide application of steel bars in concrete and the harmfulness of steel bar corrosion, the technology of improving the corrosion resistance of steel bars is still the direction and focus of the existing research.
Disclosure of Invention
Aiming at the problems of difficult migration, heavy prevention and light control, environmental leakage and the like of the existing rust inhibitor and short plates with poor compatibility of epoxy coatings and reinforced concrete, the invention aims to provide a layered adsorption type hydrotalcite mortar rust inhibitor layer, a preparation method and application thereof, which can play a role in efficiently inhibiting rust of steel bars in concrete.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a preparation method of a layered adsorption type hydrotalcite mortar rust-resistant layer comprises the following steps:
(1) preparing a hydrotalcite loaded rust inhibitor:
firstly, preparing a calcium source and an aluminum source into a salt solution, preparing the corrosion inhibitor and an alkaline substance into an alkaline solution, slowly dropwise adding the salt solution into the alkaline solution, strongly stirring the alkaline solution during titration, introducing nitrogen, controlling the pH value of the solution to keep stable in the process, and then aging, washing and drying to prepare the hydrotalcite-loaded corrosion inhibitor.
(2) Preparing a layered adsorption type hydrotalcite mortar rust-resistant layer:
and mixing cement mortar, coating the cement mortar on the surface of the steel bar in a rust-resistant layer manner, adsorbing a layer of hydrotalcite-loaded rust inhibitor particles on the surface of the mortar after each layer of mortar is coated, and circulating the steps after curing for a certain time. In the mixing process of the mortar, a proper amount of anti-cracking agent, shrinkage reducing agent and water-retaining agent are added to keep the state of the rust-resistant layer of the mortar.
Further, the rust inhibitor in the step (1) is one of benzotriazole and vitamin B6; the calcium source and the aluminum source are respectively Ca (NO) 3 ) 2 ·4H 2 O, and Al (NO) 3 ) 2 ·9H 2 O, bothIn a molar ratio of 3: 1; the alkaline solution comprises a rust inhibitor and NaOH, and the molar ratio of the rust inhibitor to the NaOH is 1: 1.
Further, controlling the pH value of the solution in the step (1) to be 9-11, aging for 3-5 h, washing the reaction product with deionized water after aging until the pH value is neutral, and drying at 50-60 ℃ to obtain the hydrotalcite loaded rust inhibitor.
Further, the water-cement ratio of the mortar in the step (2) is 0.45-0.55, the sand-lime ratio is 0.4, and the doping amount of the hydrotalcite loaded rust inhibitor is 1-6% of the mass of the cement; the anti-cracking agent is hydroxypropyl methyl cellulose, and the mixing amount is 0.1 to 0.3 percent; the shrinkage reducing agent is polyethylene glycol, and the mixing amount of the polyethylene glycol is 0.1 to 0.3 percent; the water-retaining agent is maltodextrin, and the mixing amount of the water-retaining agent is 0.3 to 1 percent.
And (3) further, coating the layered adsorption type hydrotalcite mortar rust-resistant layer obtained in the step (2) on the surface of the steel bar in a manner of brushing a brush layer by layer, spraying hydrotalcite loaded with a rust-resistant agent after each brushing of one layer, and continuing the next brushing and spraying process after curing for 1-2 hours. The thickness of the mortar rust-resistant layer is controlled to be 1-6 mm.
Compared with the prior art, the invention has the advantages that:
1. as a rust inhibitor material, the rust inhibitor is different from the traditional rust inhibitor which is doped during concrete pouring, and can effectively solve the problems of difficult migration, easy leakage, large addition amount and the like of the rust inhibitor in concrete by doping a cement mortar rust inhibitor layer.
2. The hydrotalcite-loaded rust inhibitor is doped into the mortar rust inhibitor layer in a layered adsorption manner, so that the problem of poor dispersibility of the hydrotalcite-loaded rust inhibitor in a cement-based material can be well solved, a more targeted gradient barrier and a sustained-release chlorine inhibition effect can be provided for the hydrotalcite-loaded rust inhibitor, and the advantage of rust inhibition from point to surface can be exerted.
3. Compared with the common epoxy coating, the mortar rust-resistant layer has better compatibility with a concrete matrix and provides a better interface bonding state.
4. The hydrotalcite is used for loading the green pollution-free organic rust inhibitor, so that chloride ions in the environment can be adsorbed while the rust inhibitor is effectively slowly released, and the risk of corrosion of the steel bar is reduced from the source.
Drawings
FIG. 1 is a graph showing the open circuit potential values of the samples subjected to dry-wet cycle corrosion in this example.
FIG. 2 is a graph showing the corrosion inhibition efficiency of the sample subjected to dry-wet cycle corrosion in this example.
Detailed Description
In order to better explain the present invention, the technical solution of the present invention is further explained below with reference to the accompanying drawings and specific embodiments.
Example 1
Synthesizing hydrotalcite loaded benzotriazole rust inhibitor by adopting coprecipitation method, firstly, Ca (NO) is added 3 ) 2 ·4H 2 O and Al (NO) 3 ) 2 ·9H 2 And preparing the O into a salt solution, wherein the ratio of the O to the salt solution is 3: 1. Preparing the benzotriazole rust inhibitor and NaOH into an alkali solution according to the molar ratio of 1: 1. Slowly dropwise adding the salt solution into the alkali solution, strongly stirring the alkali solution during titration, introducing nitrogen, controlling the pH of the solution to be 9 in the process, aging for 3h, washing the reaction product with deionized water after aging until the pH is neutral, and drying at 50 ℃ to obtain the hydrotalcite-loaded rust inhibitor. The usage amount of the hydrotalcite-loaded benzotriazole rust inhibitor is 1 percent of the mass of the cement, the mixing amount of the anti-cracking agent hydroxypropyl methyl cellulose is 0.1 percent of the mass of the cement, the mixing amount of the shrinkage reducing agent polyethylene glycol is 0.1 percent of the mass of the cement, and the mixing amount of the water retaining agent maltodextrin is 0.3 percent of the mass of the cement. The water-cement ratio is 0.55, and the sand-lime ratio is 0.4. A layered adsorption type hydrotalcite mortar rust-resistant layer is formed by coating mortar on the surface of a steel bar in a brush layer-by-layer coating mode, spreading hydrotalcite loaded rust-resistant agent after each layer of coating, and continuing the next coating and spreading process after curing for 2 hours. The thickness of the mortar rust-resistant layer is controlled to be about 1mm by controlling the brushing times.
Example 2
Synthesizing hydrotalcite loaded benzotriazole rust inhibitor by adopting coprecipitation method, firstly, Ca (NO) is added 3 ) 2 ·4H 2 O and Al (NO) 3 ) 2 ·9H 2 And preparing the O into a salt solution, wherein the ratio of the O to the salt solution is 3: 1. Benzotriazole rust inhibitor and NaOH are prepared into alkaline solution according to the molar ratio of 1: 1. Slowly dropwise adding the salt solution into the alkali solution, strongly stirring the alkali solution during titration, introducing nitrogen, controlling the pH of the solution to be 10 during the process, aging for 4h, washing the reaction product with deionized water after aging until the pH is neutral, and drying at 55 ℃ to obtain the hydrotalcite-loaded rust inhibitor. The usage amount of the hydrotalcite-loaded benzotriazole rust inhibitor is 3 percent of the mass of the cement, the mixing amount of the crack resistance agent hydroxypropyl methyl cellulose is 0.2 percent, the mixing amount of the shrinkage reducing agent polyethylene glycol is 0.2 percent, and the mixing amount of the water retention agent maltodextrin is 0.6 percent. The water-cement ratio is 0.5, and the sand-lime ratio is 0.4. The stirring speed of the mortar is 20r/min, and the stirring time is 120 s. The layered adsorption type hydrotalcite mortar rust-resistant layer is coated on the surface of a steel bar in a brush layer-by-layer coating mode, hydrotalcite loaded with a rust inhibitor is sprayed after one layer is coated, and the next coating and spraying process is continued after maintenance is carried out for 1.5 hours. The thickness of the mortar rust-resistant layer is controlled to be about 3mm by controlling the brushing times.
Example 3
Synthesizing hydrotalcite loaded benzotriazole rust inhibitor by adopting coprecipitation method, firstly, Ca (NO) is added 3 ) 2 ·4H 2 O and Al (NO) 3 ) 2 ·9H 2 And preparing the O into a salt solution, wherein the ratio of the O to the salt solution is 3: 1. Preparing the benzotriazole rust inhibitor and NaOH into an alkali solution according to the molar ratio of 1: 1. Slowly dropwise adding the salt solution into the alkali solution, strongly stirring the alkali solution during titration, introducing nitrogen, controlling the pH of the solution to be 11 during the process, aging for 5h, washing the reaction product with deionized water after aging until the pH is neutral, and drying at 60 ℃ to obtain the hydrotalcite-loaded rust inhibitor. The usage amount of the hydrotalcite-loaded benzotriazole rust inhibitor is 6 percent of the mass of the cement, the mixing amount of the crack resistance agent hydroxypropyl methyl cellulose is 0.3 percent, the mixing amount of the shrinkage reducing agent polyethylene glycol is 0.3 percent, and the mixing amount of the water retention agent maltodextrin is 1 percent. The water-cement ratio is 0.45, and the sand-lime ratio is 0.4. The layered adsorption type hydrotalcite mortar rust-resisting layer is formed by coating the surface of a steel bar layer by a brush, spraying hydrotalcite loaded with a rust-resisting agent after each layer is coated, and waiting for curingAfter the protection for 1 hour, the next brushing and spreading process is continued. The thickness of the mortar rust-resistant layer is controlled to be about 6mm by controlling the painting times.
Example 4
The preparation method of the hydrotalcite-supported vitamin B6 rust inhibitor is the same as that of the example 1 except that the rust inhibitor is replaced by the vitamin B6 from benzotriazole. The usage amount of the hydrotalcite-loaded vitamin B6 rust inhibitor is 1 percent of the mass of the cement, the mixing amount of the crack resistance agent hydroxypropyl methyl cellulose is 0.1 percent, the mixing amount of the shrinkage reducing agent polyethylene glycol is 0.1 percent, and the mixing amount of the water retention agent maltodextrin is 0.3 percent. The water-cement ratio is 0.55, and the sand-lime ratio is 0.4. The layered adsorption type hydrotalcite mortar rust-resistant layer is coated on the surface of a steel bar in a brush layer-by-layer coating mode, hydrotalcite loaded with a rust inhibitor is sprayed after one layer is coated, and the next coating and spraying process is continued after maintenance is carried out for 2 hours. The thickness of the mortar rust-resistant layer is controlled to be about 1mm by controlling the brushing times.
Example 5
The preparation method is the same as that in example 2 except that the rust inhibitor is replaced by vitamin B6 from benzotriazole, and the hydrotalcite-supported vitamin B6 rust inhibitor is prepared. The usage amount of the hydrotalcite-loaded vitamin B6 rust inhibitor is 3% of the mass of the cement, and the mixing amount of the hydrotalcite-loaded rust inhibitor is 3% of the mass of the cement. 0.2 percent of anti-cracking agent hydroxypropyl methyl cellulose, 0.2 percent of shrinkage reducing agent polyethylene glycol and 0.6 percent of water retention agent maltodextrin. The water-cement ratio is 0.5, and the sand-lime ratio is 0.4. The layered adsorption type hydrotalcite mortar rust-resistant layer is coated on the surface of a steel bar by adopting a brush layer-by-layer coating mode, after one layer is coated, a hydrotalcite load rust-resistant agent is sprayed, and after the steel bar is maintained for 1.5 hours, the next coating and spraying process is continued. The thickness of the mortar rust-resistant layer is controlled to be about 3mm by controlling the brushing times.
Example 6
The preparation method is the same as that in example 3 except that the rust inhibitor is replaced by vitamin B6 from benzotriazole, and the hydrotalcite-supported vitamin B6 rust inhibitor is prepared. The usage amount of the hydrotalcite-loaded vitamin B6 rust inhibitor is 6 percent of the mass of the cement, the mixing amount of the crack resistance agent hydroxypropyl methyl cellulose is 0.3 percent, the mixing amount of the shrinkage reducing agent polyethylene glycol is 0.3 percent, and the mixing amount of the water retention agent maltodextrin is 1 percent. The water-cement ratio is 0.45, and the sand-lime ratio is 0.4. The layered adsorption type hydrotalcite mortar rust-resistant layer is coated on the surface of a steel bar in a brush layer-by-layer coating mode, hydrotalcite loaded with a rust inhibitor is sprayed after one layer is coated, and the next coating and spraying process is continued after maintenance is carried out for 1 hour. The thickness of the mortar rust-resistant layer is controlled to be about 6mm by controlling the brushing times.
Comparative example 1
The hydrotalcite is internally doped with the rust inhibitor loaded sample, and in the mortar mixing stage, the hydrotalcite rust inhibitor is doped into the mortar, and other steps are consistent with the components and the preparation process of the mortar rust inhibitor layer in the example 2.
Comparative example 2
3% of hydrotalcite-loaded rust inhibitor-doped epoxy resin coating, wherein the type of the hydrotalcite-loaded rust inhibitor is the same as that in example 2, and the coating thickness is 3 mm.
Evaluation of rust resistance:
pouring the steel bar coated with the rust-resistant layer into a mortar test block according to the use method of a common steel bar, then carrying out a dry-wet cycle alternate corrosion test on the test block, wherein the concentration of sodium chloride in a corrosion solution is 5%, and qualitatively and quantitatively researching the corrosion inhibition capability by adopting an Open Circuit Potential (OCP) Electrochemical Impedance Spectroscopy (EIS). Tests were carried out in the experimental manner given above, giving open circuit potentials (fig. 1) and rust inhibition efficiencies (fig. 2), respectively.
As can be seen from the data of open-circuit potential (figure 1) and rust-resisting efficiency (figure 2), the rust-resisting effect of the layered adsorption type hydrotalcite mortar rust-resisting layer is obviously superior to that of the traditional epoxy coating and the mortar rust-resisting layer internally doped with the hydrotalcite-loaded rust inhibitor. This is due to several reasons: (1) the main components of the mortar rust-resistant layer are consistent with the components of the mortar test block, the compatibility problem does not exist, the compatibility between the epoxy coating and the mortar and the steel bar is poor, after the mortar rust-resistant layer is soaked for a period of time, obvious gaps are formed between the epoxy coating and the steel bar and between the epoxy coating and the mortar, and a large amount of corrosive solution permeates into the gaps to accelerate the corrosion of the steel bar; (2) the hydrotalcite rust inhibitor has a good synergistic effect, and effectively solidifies chloride ions in the environment while slowly releasing the rust inhibitor; (3) the hydrotalcite rust inhibitor is added in a spreading and adsorbing manner, so that the problem of agglomeration of the hydrotalcite rust inhibitor in mortar is effectively avoided, and the rust inhibiting effect is improved; (4) through the adding mode of layer-by-layer spreading and layered adsorption, a multi-layer slow-release chlorine-resistant barrier is formed in the mortar rust-resistant layer, and chlorine ion transmission is effectively isolated.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A preparation method of a layered adsorption type hydrotalcite mortar rust-resistant layer is used for corrosion prevention of reinforced concrete, and is characterized by comprising the following steps:
(1) preparing a hydrotalcite loaded rust inhibitor:
synthesizing and preparing the hydrotalcite-loaded rust inhibitor by adopting a coprecipitation method, firstly preparing a calcium source and an aluminum source into a salt solution, preparing the rust inhibitor and an alkaline substance into an alkaline solution, slowly dropwise adding the salt solution into the alkaline solution, strongly stirring the alkaline solution during titration, introducing nitrogen, controlling the pH value of the solution to keep stable in the process, and preparing the hydrotalcite-loaded rust inhibitor by ageing, washing and drying;
(2) preparing a layered adsorption type hydrotalcite mortar rust-resistant layer:
mixing cement mortar, coating the cement mortar on the surface of a steel bar in a form of a rust-resistant layer, adsorbing a layer of hydrotalcite-loaded rust inhibitor particles on the surface of the mortar after each layer of mortar is coated, and circulating the steps after curing for a period of time to obtain a layered adsorption type hydrotalcite mortar rust-resistant layer; in the mixing process of the mortar, an anti-cracking agent, a shrinkage reducing agent and a water-retaining agent are added simultaneously to keep the state of a rust-resistant layer of the mortar.
2. The preparation method of the layered adsorption type hydrotalcite mortar rust-resistant layer according to claim 1, which is characterized by comprising the following steps: the rust inhibitor in the step (1) is one of benzotriazole and vitamin B6Seed growing; the calcium source and the aluminum source in the step (1) are respectively Ca (NO) 3 ) 2 ·4H 2 O and Al (NO) 3 ) 2 ·9H 2 O, the ratio of the two is 3: 1; the components of the alkali solution are a rust inhibitor and NaOH, and the molar ratio of the rust inhibitor to the NaOH is 1: 1.
3. The preparation method of the layered adsorption type hydrotalcite mortar rust-resistant layer according to claim 1, which is characterized by comprising the following steps: and (2) controlling the pH value of the solution in the step (1) to be 9-11, aging for 3-5 hours, washing the reaction product with deionized water after aging until the pH value is neutral, and drying at 50-60 ℃ to obtain the hydrotalcite-loaded rust inhibitor.
4. The preparation method of the layered adsorption type hydrotalcite mortar rust-resistant layer according to claim 1, characterized in that: the water-cement ratio of the mixed cement mortar in the step (2) is 0.45-0.55, the sand-lime ratio is 0.4, and the doping amount of the hydrotalcite load corrosion inhibitor is 1-6% of the mass of the cement; the anti-cracking agent is hydroxypropyl methyl cellulose, and the mixing amount of the anti-cracking agent is 0.1-0.3 percent of the mass of the cement; the shrinkage reducing agent is polyethylene glycol, and the mixing amount of the polyethylene glycol accounts for 0.1-0.3 percent of the mass of the cement; the water-retaining agent is maltodextrin, and the mixing amount of the water-retaining agent is 0.3-1% of the mass of the cement.
5. The preparation method of the layered adsorption type hydrotalcite mortar rust-resistant layer according to claim 1, characterized in that: the layered adsorption type hydrotalcite mortar rust-resistant layer obtained in the step (2) is coated on the surface of the reinforcing steel bar in a layer-by-layer coating mode through a brush, a hydrotalcite load rust-resistant agent is sprayed after each layer is coated, the next coating and spraying process is continued after the curing is carried out for 1-2 hours, and the thickness of the mortar rust-resistant layer is 1-6 mm.
6. A layered adsorption type hydrotalcite mortar rust-resistant layer is characterized in that: the layered adsorption type hydrotalcite mortar rust-resistant layer is prepared by the method of any one of claims 1 to 5.
7. The application of the layered adsorption type hydrotalcite mortar rust-resistant layer of claim 6 is characterized in that: the layered adsorption type hydrotalcite mortar rust-resistant layer is used for corrosion prevention in reinforced concrete.
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| KR102343389B1 (en) * | 2021-01-20 | 2021-12-28 | 한국산업기술 주식회사 | Eco-friendly repairing multiple protection layer with waterproof and corrosion protecting function for reinforced concrete structure and reinforced concrete structure repairing method using the same |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320769A (en) * | 2011-07-29 | 2012-01-18 | 暨南大学 | Composite reinforced concrete corrosion-inhibiting agent and preparation method thereof |
| CN107988601A (en) * | 2017-11-29 | 2018-05-04 | 中国科学院海洋研究所 | A kind of hydrotalcite intercalation 5- methyl isophthalic acids, 3,4,-thiadiazoles -2- sulfydryls corrosion inhibitor and its application |
| CN107986662A (en) * | 2017-11-29 | 2018-05-04 | 中国科学院海洋研究所 | A kind of hydrotalcite intercalation 2- amino -5- sulfydryls -1,3,4- thiadiazoles corrosion inhibitor and its application |
| CN108439852A (en) * | 2018-03-31 | 2018-08-24 | 芜湖扬展新材料科技服务有限公司 | A kind of rust-resistant agent for concrete reinforcing bar |
| KR102343389B1 (en) * | 2021-01-20 | 2021-12-28 | 한국산업기술 주식회사 | Eco-friendly repairing multiple protection layer with waterproof and corrosion protecting function for reinforced concrete structure and reinforced concrete structure repairing method using the same |
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