CN115073082B - Microcapsule for self-repairing cement-based material microcrack in running water environment and preparation method thereof - Google Patents
Microcapsule for self-repairing cement-based material microcrack in running water environment and preparation method thereof Download PDFInfo
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- CN115073082B CN115073082B CN202210529177.5A CN202210529177A CN115073082B CN 115073082 B CN115073082 B CN 115073082B CN 202210529177 A CN202210529177 A CN 202210529177A CN 115073082 B CN115073082 B CN 115073082B
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- cement
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- microcapsule
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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
- C04B2111/72—Repairing or restoring existing buildings or building materials
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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 invention discloses a microcapsule for self-repairing a cement-based material microcrack in a running water environment and a preparation method thereof, wherein the core material of the microcapsule comprises the following components: chelating super absorbent resin, cement permeation crystallization waterproof material and high-performance expanding agent; preparing core material particles by a round pan granulation method, wherein the super absorbent resin is used as an expansion plugging component, the cement permeation crystallization waterproof material and the high-performance expansion agent are used as a crystallization repairing component, the expansion plugging component expands to plug cracks when meeting water, and the crystallization repairing component further repairs the cracks; the Portland cement is adopted to wrap the core material particles, and redispersible emulsion powder aqueous solution is sprayed for bonding during wrapping, so that the microcapsule core material can be prevented from contacting and reacting with mixing water during pouring by the wrapping process; the invention is used for self-repairing the cement-based material cracks in the running water environment with water pressure, and has wider application range.
Description
Technical Field
The invention relates to the technical field of new materials, in particular to a microcapsule for self-repairing cement-based material microcracks in a running water environment and a preparation method thereof.
Background
Cement-based materials are the most widely used materials in the civil engineering field, but because of their poor tensile properties, they are very susceptible to cracking during service, so cement-based materials are typically in service with cracks. However, the existence of cracks greatly influences the service performance and service life of the cement-based material, and later maintenance, repair and even reconstruction are needed manually, so that a great deal of manpower and material resources are consumed.
Although the cement-based material itself has some self-repairing capability of cracks, natural repairing is a very slow process and has a limited degree of repairing. Therefore, cement-based material self-repairing technology has become one of the emerging research directions in the field of civil engineering materials. The common cement-based material crack self-repairing method comprises the following steps: hollow tube self-repair, microbial self-repair, microcapsule self-repair, and the like. Chinese patent CN109336525a discloses a bridge crack repairing material with self-repairing effect and a preparation method thereof, wherein nano zinc oxide-based asphalt is used as an organic system in the repairing material, the permeability of the repairing material is utilized to enable the crack position to generate self-repairing effect, and bostat is added to improve the connection strength of cement and an original bridge, and the repairing material is mainly used for piers of highways. The patent utilizes the permeability of the repairing material to enable the repairing material to generate self-repairing effect at the crack position, and the main component is hydrophobic organic matters, so that the repairing effect can be obviously lost in the flowing water environment. Chinese patent CN110372310a discloses an anti-crack self-repairing concrete and its preparation method, the anti-crack self-repairing concrete comprises fly ash, semi-hydrated gypsum, silica fume, polypropylene fiber, calcium oxide, ammonium chloride, barium hydroxide octahydrate, silane coupling agent, etc.; and (3) mixing the glass fiber pipe filled with the repairing agent into concrete to prepare the anti-crack self-repairing concrete. The self-repairing effect of the self-repairing material in the flowing water environment is not related. Chinese patent CN204529127a discloses a microbial composite additive for self-repairing cement-based material cracking, which is formed by mixing bacterial liquid, repairing nutrient components and auxiliary components. It is not demonstrated by examples whether the running water environment would jeopardize the survival conditions of the microorganisms in this patent and impair their self-healing effect. Chinese patent CN106082893A discloses a leakage self-repairing mortar and a preparation method thereof, wherein the main components of the mortar comprise sulphoaluminate cement, super absorbent polymer, silicon dioxide, calcium hydroxide and the like, and the mortar is mainly used for waterproof engineering of a concrete surface layer. The repairing material in the mortar can react with water rapidly in the mixing process due to no denser package, so that the later repairing effect is reduced; and the strength of the mortar is lowered due to the reaction of the super absorbent polymer and the mixing water.
The other problem of the above patent is that the construction cost is high, the mechanical property of concrete is affected, and the microorganism is difficult to survive in high-alkali environment. In addition, the existing self-repairing technology of cement-based materials is mostly realized under the condition of still water. However, some cement-based materials in engineering practice are required to meet certain impervious requirements or to be in service under water flow conditions. Under the action of water pressure, the repairing substances generated in the cracks are very easy to wash away by water flow, and the expected repairing effect cannot be achieved. Therefore, the self-repairing technology should be actually combined with engineering, and the influence of water flow on the repairing effect is considered, so that the self-repairing of the cement-based material cracks under the action of the water flow is realized.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides the self-repairing microcapsule which can be automatically repaired in a running water environment after cracking and can realize leakage prevention or plugging.
The invention adopts a mode of combining expansion plugging and crystallization repairing, uses the chelating treated super absorbent resin as an expansion component, uses cement permeation crystallization waterproof material and concrete high-performance expanding agent as a crystallization repairing component, sprays swelling resin aqueous solution when granulating in a round pot to play a role of bonding powder and certain waterproof, and uses silicate cement to wrap a shell and spray redispersible emulsion powder aqueous solution after the obtained particles are dried to prevent repairing substances from directly contacting and reacting with water in the preparation process of cement-based materials.
The technical scheme of the invention is as follows:
the microcapsule for self-repairing the cement-based material microcrack in the running water environment is prepared from the following raw materials in percentage by mass:
preferably, the microcapsule for self-repairing cement-based material microcracks in an flowing water environment is prepared from the following raw materials in percentage by mass:
also preferably, the microcapsule for self-repairing cement-based material microcracks in an flowing water environment is prepared from the following raw materials in percentage by mass:
in the invention, the following components are added:
the chelating super absorbent resin is white powder, the particle size is 80 meshes or less, the chelating super absorbent resin can not absorb water and expand when meeting water, and the Jie Ao chelating super absorbent resin can recover the water absorption expansion function;
the cement permeation crystallization waterproof material is a powdery solid, and the fineness is 80 meshes or less; the main components of the cement comprise Portland cement, fine sand, sodium citrate, sodium carbonate and the like;
the high-performance expanding agent is powdery solid and is ettringite expanding agent, and the fineness is 80 meshes or less;
the swelling resin is polyvinyl alcohol powder, the alcoholysis degree is 99%, and the particle size is 100 meshes or less;
the redispersible emulsion powder is white powder, the main component is vinyl acetate/ethylene copolymerized emulsion powder, and the particle size is below 400 mu m;
the ordinary Portland cement is gray powder, and the main components of the ordinary Portland cement comprise Portland cement clinker, gypsum and the like.
The preparation method of the microcapsule for self-repairing the cement-based material microcrack in the running water environment comprises the following steps of:
A. adding the swelling resin into water, heating to 80-85 ℃, stirring to fully dissolve and disperse the swelling resin to obtain a swelling resin aqueous solution;
B. uniformly mixing the chelating super absorbent resin, the cement permeation crystallization waterproof material and the high-performance expanding agent, pouring the mixture into a circular pot granulator, controlling the circular pot to rotate at a rotating speed of 35-45 r/min, spraying the swelling resin aqueous solution, bonding the wet powder to form particles, drying (100 ℃) and sieving to select the particle size of 0.25mm or less to obtain the self-repairing core material;
C. adding the redispersible latex powder into water, heating to 70-80 ℃, stirring to dissolve and disperse the redispersible latex powder to obtain redispersible latex powder aqueous solution;
D. uniformly mixing the self-repairing core material and the ordinary Portland cement, pouring the mixture into a circular pot granulator, controlling the circular pot to rotate at a rotating speed of 35-45 r/min, and simultaneously spraying a redispersible emulsion powder aqueous solution to enable the cement to be attached to the core material to form a shell;
E. and (3) curing the core material of the wrapping shell for 7 days at the room temperature of 20 ℃ and the humidity of below 70%, and sieving to select the particle size of 0.25-1.18 mm to obtain the crack self-repairing microcapsule.
Compared with the prior art, the invention has the advantages that:
the invention develops the microcapsule which combines expansion plugging and crystallization repair and can autonomously repair the crack under the state of cracking seepage, and can solve the problem of repairing the cement-based material crack under the action of water flow. The chelate super absorbent resin used in the invention does not absorb water and expand in the preparation process of the self-repairing microcapsule. After the cement-based material is cracked, water flows permeate into the cracks, and carbonate in the cement-permeated crystalline waterproof material in the microcapsules is dissolved, so that the super absorbent resin is subjected to chelation and water absorption expansion, the cracks are quickly plugged, and leakage is relieved. Then, the cement permeates the crystalline waterproof material and the high-performance expanding agent to generate a repairing substance through chemical reaction so as to further repair the crack.
The chelating super absorbent resin has a three-dimensional network structure with a large number of hydrophilic groups and low crosslinking degree, and is a novel functional polymer material capable of absorbing a large amount of water, only expanding but not dissolving, and also locking the water without flowing outwards. The material can absorb water with the volume of more than 100 times, and the highest water absorption rate can even reach more than 1000 times, and when the material is used as a self-repairing material, the material can expand after the cement-based material is cracked, and the crack can be quickly plugged.
The chelating super absorbent resin of the invention has greatly reduced water absorption capacity after being subjected to chelating treatment (C-SAP), and can quickly recover the water absorption capacity when the chelating super absorbent resin is contacted with carbonate. The chelating treatment can prevent the super absorbent resin from absorbing mixing water during the preparation of the cement-based material, affecting the working performance and mechanical property of the cement-based material, and simultaneously preventing the super absorbent resin from losing expansion capacity before crack repair.
The active substances in the cement-based permeable crystalline waterproof material can react with calcium ions in the cement material and permeate into capillary channels or microcracks of the cement-based material. In a humid environment, these active substances can react with the cement hydration product Ca (OH) 2 、Ca + The reaction generates insoluble calcium salt, fills up capillary channels and cracks, and simultaneously makes cement-based materials become more compact.
The high-performance expanding agent used in the invention is a common building material additive, and the high-performance expanding agent can promote the formation of ettringite in a cement-based material system. Ettringite may be filled in the cracks to repair the cracks.
The swelling resin is polyvinyl alcohol (PVA), has an alcoholysis degree of 99%, has certain viscosity after being dissolved in water, can bond powder of the core material, and can play a role of slow-release core material.
The redispersible emulsion powder has good redispersibility, can be re-emulsified into stable polymer emulsion after being added with water, is a common waterproof material, and has outstanding waterproof performance and good bonding strength.
The microcapsule for self-repairing of cement-based material microcracks in a running water environment is doped into a cement-based material in a mode of replacing fine aggregates by equal mass.
Drawings
FIG. 1 is a flow chart of the preparation of microcapsules for self-repairing cement-based microcracks in an in-line environment.
Detailed Description
The present invention is further described below by way of specific examples, but the scope of the present invention is not limited thereto.
The sources of raw materials and their associated parameters used in the following examples are shown in the following table:
example 1
The proportion of each component in the embodiment is as follows:
the preparation method of the self-repairing microcapsule comprises the following steps:
preparing a swellable resin aqueous solution according to the ratio of swellable resin to water=1:99, and pouring the swellable resin aqueous solution into a watering can; mixing the chelating super absorbent resin, the cement permeation crystallization waterproof material and the high-performance expanding agent, uniformly stirring, pouring into a round pan granulator, rotating at the rotating speed of 35r/min, and simultaneously spraying the swelling resin aqueous solution to prepare a granule core material; drying the obtained core material particles, and sieving to select the particle size of 0.25mm or less; preparing a redispersible emulsion powder aqueous solution according to the ratio of water=1:9, and pouring the redispersible emulsion powder aqueous solution into a spray can; uniformly mixing the core materials according to the proportion of Portland cement=1:2, pouring the mixture into a circular pan granulator for rotating at a rotating speed of 35r/min, spraying a redispersible emulsion powder aqueous solution to prepare self-repairing microcapsules, placing the microcapsules at room temperature of 20 ℃ and humidity of 70% for curing for 7 days, and selecting self-repairing particles with the particle size of 0.25-1.18 mm.
Repair performance: a restoration performance pre-evaluation device (see CN202110449200.5 for details) is used, the water head height is controlled to be 50mm, a water seepage test is carried out, microcapsules with the volume doping amount of 20% are doped, and a crack with the thickness of 0.5mm can be restored in 41.7 hours.
Example 2
The proportion of each component in the embodiment is as follows:
the preparation method of the self-repairing microcapsule is shown in example 1.
Repair performance: the restoration performance pre-evaluation device (see CN202110449200.5 for details) is used, the water head height is controlled to be 50mm, a water seepage test is carried out, microcapsules with the volume doping amount of 30% are doped, and a crack with the thickness of 0.6mm can be restored within 35.4 hours.
The foregoing is illustrative of the present invention and is not to be construed as limiting thereof, but rather, the present invention is to be construed as limited to the appended claims.
Claims (3)
1. The microcapsule for self-repairing the cement-based material microcrack in the running water environment is characterized by being prepared from the following raw materials in percentage by mass:
wherein, the liquid crystal display device comprises a liquid crystal display device,
the chelating super absorbent resin is white powder with the particle diameter of 80 meshes or less, the chelating super absorbent resin can not absorb water and expand when meeting water, and the Jie Ao chelating super absorbent resin can recover the water absorption and expansion function;
the cement-penetrating crystalline waterproof material is powdery solid, and the fineness is 80 meshes or below; the main components of the cement comprise Portland cement, fine sand, sodium citrate and sodium carbonate;
the redispersible emulsion powder is white powder, the main component is vinyl acetate/ethylene copolymerized emulsion powder, and the particle size is below 400 mu m;
the preparation method of the microcapsule for self-repairing the cement-based material microcrack in the running water environment comprises the following steps:
A. adding the swelling resin into water, heating to 80-85 ℃, stirring to fully dissolve and disperse the swelling resin to obtain a swelling resin aqueous solution;
B. uniformly mixing the chelating super absorbent resin, the cement permeation crystallization waterproof material and the high-performance expanding agent, pouring the mixture into a circular pot granulator, controlling the circular pot to rotate at a rotating speed of 35-45 r/min, spraying the swelling resin aqueous solution at the same time, bonding the wet powder to form particles, drying, sieving the particles, and selecting the particle size of 0.25mm or less to obtain the self-repairing core material;
C. adding the redispersible latex powder into water, heating to 70-80 ℃, stirring to dissolve and disperse the redispersible latex powder to obtain redispersible latex powder aqueous solution;
D. uniformly mixing the self-repairing core material and the ordinary Portland cement, pouring the mixture into a circular pot granulator, controlling the circular pot to rotate at a rotating speed of 35-45 r/min, and simultaneously spraying a redispersible emulsion powder aqueous solution to enable the cement to be attached to the core material to form a shell;
E. and (3) curing the core material of the wrapping shell for 7 days at the room temperature of 20 ℃ and the humidity of below 70%, and sieving to select the particle size of 0.25-1.18 mm to obtain the crack self-repairing microcapsule.
2. The microcapsule for self-repairing cement-based material microcracks in an aqueous environment according to claim 1, which is characterized by being prepared from the following raw materials in percentage by mass:
3. the microcapsule for self-repairing cement-based material microcracks in an aqueous environment according to claim 1, which is characterized by being prepared from the following raw materials in percentage by mass:
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104671697A (en) * | 2015-02-05 | 2015-06-03 | 江苏苏博特新材料股份有限公司 | Modified calcium oxide expansive agent used for cement concrete and preparation method thereof |
| CN110282903A (en) * | 2019-07-26 | 2019-09-27 | 深圳大学 | Microcapsules of repairing concrete crack and preparation method thereof |
| CN110776270A (en) * | 2019-11-06 | 2020-02-11 | 山东大学 | Composite structure self-repairing microcapsule particle and preparation method and application thereof |
| CN111847946A (en) * | 2020-06-10 | 2020-10-30 | 山东大学 | Efficient lossless preparation method of controllable particle size self-repairing microcapsule and prepared microcapsule |
| CN113045283A (en) * | 2021-03-24 | 2021-06-29 | 交通运输部公路科学研究所 | Intelligent trigger type concrete micro-crack self-repairing microcapsule and preparation method thereof |
| CN114195418A (en) * | 2021-12-30 | 2022-03-18 | 山东大学 | High-strength self-repairing capsule and production process thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104944833A (en) * | 2015-03-31 | 2015-09-30 | 深圳大学 | Microcapsule for self-repair concrete and preparation method of self-repair concrete |
| CN108823198A (en) * | 2018-07-20 | 2018-11-16 | 山东科技大学 | A kind of microcapsules and preparation method thereof that may continue from repairing Leaking Stoppage in Coal Mine wind material crack |
-
2022
- 2022-05-16 CN CN202210529177.5A patent/CN115073082B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104671697A (en) * | 2015-02-05 | 2015-06-03 | 江苏苏博特新材料股份有限公司 | Modified calcium oxide expansive agent used for cement concrete and preparation method thereof |
| CN110282903A (en) * | 2019-07-26 | 2019-09-27 | 深圳大学 | Microcapsules of repairing concrete crack and preparation method thereof |
| CN110776270A (en) * | 2019-11-06 | 2020-02-11 | 山东大学 | Composite structure self-repairing microcapsule particle and preparation method and application thereof |
| CN111847946A (en) * | 2020-06-10 | 2020-10-30 | 山东大学 | Efficient lossless preparation method of controllable particle size self-repairing microcapsule and prepared microcapsule |
| CN113045283A (en) * | 2021-03-24 | 2021-06-29 | 交通运输部公路科学研究所 | Intelligent trigger type concrete micro-crack self-repairing microcapsule and preparation method thereof |
| CN114195418A (en) * | 2021-12-30 | 2022-03-18 | 山东大学 | High-strength self-repairing capsule and production process thereof |
Non-Patent Citations (2)
| Title |
|---|
| 微胶囊自修复水泥基材料渗透性修复效果及其评定;金海东;《中国优秀硕士学位论文全文数据库工程科技Ⅰ辑》;20190715(第07期);第1.3节、第2.2.2.3节、第2.2.2.5节以及第2.3.3节 * |
| 裂缝自修复材料修复性能评价的实验研究;金城阳;《中国优秀硕士学位论文全文数据库工程科技Ⅰ辑》;20200215(第02期);第2.1.1节、第3.1节 * |
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