CN107500589B - Self-repairing microcapsule concrete capable of fixing carbon dioxide - Google Patents
Self-repairing microcapsule concrete capable of fixing carbon dioxide Download PDFInfo
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- CN107500589B CN107500589B CN201710965873.XA CN201710965873A CN107500589B CN 107500589 B CN107500589 B CN 107500589B CN 201710965873 A CN201710965873 A CN 201710965873A CN 107500589 B CN107500589 B CN 107500589B
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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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Abstract
The invention relates to self-repairing microcapsule concrete capable of fixing carbon dioxide, which comprises self-compacting concrete and first steel capsules dispersed in the self-compacting concrete, wherein the first steel capsules comprise first steel capsule walls, first capsule cores and first ceramic rings, the first capsule cores comprise carbon dioxide solid adsorbents adsorbing carbon dioxide, and the first ceramic rings are arranged in the middle of the steel capsules. The brittle ceramic ring is broken in time when being stressed, and after the ceramic ring is broken, the carbon dioxide diffuses the steel-tapping capsule to react with free calcium ions in water to generate solid calcium carbonate to fill cracks. The invention has the beneficial effects that the intelligent self-repairing function can be realized, the emission of carbon dioxide is reduced by converting the carbon dioxide into calcium carbonate, the carbon dioxide solid adsorbent can be recycled, and the generation of solid waste is reduced.
Description
Technical Field
The invention relates to the technical field of self-repairing concrete. In particular to self-repairing microcapsule concrete capable of fixing carbon dioxide.
Background
Cracks in cement-based materials are the root cause of premature failure of building structures. The art has been working on developing concrete having a self-repairing function.
The Chinese patent application 201210580233.4 discloses a composite capsule underground structure concrete self-repairing system with built-in aerobic microorganisms, which has the basic idea that when cracks appear in concrete, capsules are broken to activate dormant microorganisms, carbon dioxide released by the respiration of the microorganisms reacts with free calcium ions in water to generate solid calcium carbonate, and thus the cracks are repaired and filled. Calcium hydroxide is slightly soluble in water and therefore the free calcium ions are not sufficient to generate the calcium carbonate needed to repair the microcracks.
Chinese patent application 201610169329.X discloses a nuclear radiation-proof self-healing concrete containment, disclosing a lead steel capsule comprising a ceramic ring, because the ceramic is a brittle material, and has a proper thickness, and can be damaged in time, so that the structural adhesive in the lead steel capsule can flow out in time to repair cracks.
In addition, carbon dioxide is a greenhouse gas, and excessive emission of carbon dioxide causes a series of global climate problems such as melting of icebergs and rising of sea level. Currently, the use of carbon dioxide solid adsorbents to adsorb carbon dioxide is a new hot spot for carbon dioxide capture and separation. The adsorbed carbon dioxide can be separated from the carbon dioxide solid adsorbent by changing the temperature, i.e. the carbon dioxide solid adsorbent is regenerated. However, after a plurality of regeneration cycles, the adsorption efficiency of the carbon dioxide solid adsorbent is reduced. Eventually, the carbon dioxide solid adsorbent having absorbed a large amount of carbon dioxide becomes solid waste, causing a serious environmental problem.
Therefore, the self-repairing microcapsule concrete capable of fixing carbon dioxide, which can realize the self-repairing function and reduce the carbon dioxide solid adsorbent waste, is urgently needed in the field.
Disclosure of Invention
The invention aims to provide self-repairing microcapsule concrete capable of fixing carbon dioxide, which can realize a self-repairing function and reduce carbon dioxide solid adsorbent waste. Specifically, the self-healing microencapsulated concrete of the present invention comprises steel capsules dispersed in self-compacting concrete, the steel capsules comprising brittle ceramic rings to break in time when stressed. In addition, the steel capsule includes a carbon dioxide solid adsorbent adsorbing carbon dioxide as a capsule core, and carbon dioxide is separated from the carbon dioxide solid adsorbent with day-night alternation and four-season alternation. After the ceramic ring is broken, the carbon dioxide diffuses out of the steel capsule to react with free calcium ions in the water, solid calcium carbonate is generated, and cracks are filled. The self-repairing microcapsule concrete capable of fixing carbon dioxide can realize an intelligent self-repairing function, reduces the emission of carbon dioxide by converting the carbon dioxide into calcium carbonate, and can recycle the carbon dioxide solid adsorbent and reduce the generation of solid wastes.
In order to achieve the above object, the present invention provides the following technical solutions.
In a first aspect, the present invention provides a carbon dioxide-fixable, self-repairing microcapsule concrete comprising self-compacting concrete and first steel capsules dispersed therein, the first steel capsules comprising a first steel capsule wall, a first capsule core, and a first ceramic ring, wherein the first capsule core comprises a carbon dioxide solid adsorbent that adsorbs carbon dioxide, and the first ceramic ring is disposed in the middle of the steel capsules.
In one embodiment of the first aspect, the self-repairing microcapsule concrete capable of fixing carbon dioxide further comprises a second steel capsule, the second steel capsule comprises a second steel capsule wall, a second capsule core and a second ceramic ring, wherein the second capsule core comprises a water-heating material, and the second ceramic ring is arranged in the middle of the second steel capsule.
In another embodiment of the first aspect, the water-swellable material comprises calcium oxide.
In another embodiment of the first aspect, the first steel capsule wall further comprises a corrosion resistant coating disposed on an inner surface thereof.
In another embodiment of the first aspect, the carbon dioxide solid adsorbent comprises a mesoporous material, a molecular sieve, a carbonaceous adsorbent.
In another embodiment of the first aspect, the carbon dioxide solid adsorbent comprises one or more of a 13X molecular sieve adsorbent modified with an attapulgite binder, carbon nanotubes, activated carbon, MIL-101 material, and zeolitic imidazolate structural material.
In another embodiment of the first aspect, the first ceramic ring has a wall thickness of 0.2-0.3mm and a height of 2-2.5mm, and the first ceramic ring has an inner diameter the same as the inner diameter of the first steel capsule wall and is disposed within the central groove of the first steel capsule wall.
In another embodiment of the first aspect, the second ceramic ring has a wall thickness of 0.2-0.3mm and a height of 2-2.5mm, and has an inner diameter the same as the inner diameter of the second steel capsule wall and is disposed within the central groove of the second steel capsule wall.
In another embodiment of the first aspect, the first steel capsule wall has a thickness of 0.2-0.4 mm.
In another embodiment of the first aspect, the thickness of the second steel capsule wall is 0.2-0.4 mm.
Compared with the prior art, the invention has the beneficial effects that the intelligent self-repairing function can be realized, the emission of carbon dioxide is reduced by converting the carbon dioxide into calcium carbonate, and the carbon dioxide solid adsorbent can be recycled, so that the generation of solid wastes is reduced.
Drawings
Fig. 1 schematically shows a structural view of a first steel capsule according to the present invention.
Fig. 2 schematically shows a structural view of a second steel capsule according to the present invention.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments of the present invention. The dimensions of the figures are not to scale and the dimensions of some of the elements may be exaggerated to show some features clearly.
The invention aims to provide self-repairing microcapsule concrete capable of fixing carbon dioxide, which can realize a self-repairing function and reduce carbon dioxide solid adsorbent waste. Specifically, the self-healing microencapsulated concrete of the present invention comprises steel capsules dispersed in self-compacting concrete, the steel capsules comprising brittle ceramic rings to break in time when stressed. In addition, the steel capsule includes a carbon dioxide solid adsorbent adsorbing carbon dioxide as a capsule core, and carbon dioxide is separated from the carbon dioxide solid adsorbent with day-night alternation and four-season alternation. After the ceramic ring is broken, the carbon dioxide diffuses out of the steel capsule to react with free calcium ions in the water, solid calcium carbonate is generated, and cracks are filled.
In one embodiment, the self-repairing microcapsule concrete of the invention can also comprise a steel capsule with a ceramic ring of a water-heating material. In actual construction, the two microcapsules can be uniformly mixed first. After two kinds of steel capsules are all damaged, the water-encountering heating material is dissolved in water to release heat and promote the separation of carbon dioxide from the carbon dioxide solid adsorbent, so that the microcracks of the concrete are quickly and intelligently repaired.
In a preferred embodiment, the water-heating material may be calcium oxide. Under the condition, calcium oxide is dissolved in water to form calcium hydroxide, so that the release of carbon dioxide can be promoted, sufficient free calcium ions can be provided, and the self-repairing of concrete is promoted.
Specifically, the invention provides a carbon dioxide-fixable self-repairing microcapsule concrete which comprises self-compacting concrete and first steel capsules dispersed in the self-compacting concrete, wherein the first steel capsules comprise first steel capsule walls, first capsule cores and first ceramic rings, the first capsule cores comprise carbon dioxide solid adsorbents adsorbing carbon dioxide, and the first ceramic rings are arranged in the middles of the steel capsules.
In one embodiment of the first aspect, the self-repairing microcapsule concrete capable of fixing carbon dioxide further comprises a second steel capsule, the second steel capsule comprises a second steel capsule wall, a second capsule core and a second ceramic ring, wherein the second capsule core comprises a water-heating material, and the second ceramic ring is arranged in the middle of the second steel capsule.
In another embodiment of the first aspect, the water-swellable material comprises calcium oxide.
In another embodiment of the first aspect, the first steel capsule wall further comprises a corrosion resistant coating disposed on an inner surface thereof.
In another embodiment of the first aspect, the carbon dioxide solid adsorbent comprises a mesoporous material, a molecular sieve, a carbonaceous adsorbent.
In another embodiment of the first aspect, the carbon dioxide solid adsorbent comprises one or more of a 13X molecular sieve adsorbent modified with an attapulgite binder, carbon nanotubes, activated carbon, MIL-101 material, and zeolitic imidazolate structural material.
In another embodiment of the first aspect, the first ceramic ring has a wall thickness of 0.2-0.3mm and a height of 2-2.5mm, and the first ceramic ring has an inner diameter the same as the inner diameter of the first steel capsule wall and is disposed within the central groove of the first steel capsule wall.
In another embodiment of the first aspect, the second ceramic ring has a wall thickness of 0.2-0.3mm and a height of 2-2.5mm, and has an inner diameter the same as the inner diameter of the second steel capsule wall and is disposed within the central groove of the second steel capsule wall.
In another embodiment of the first aspect, the first steel capsule wall has a thickness of 0.2-0.4 mm.
In another embodiment of the first aspect, the thickness of the second steel capsule wall is 0.2-0.4 mm.
Referring to fig. 1, fig. 1 shows a schematic structural view of a first steel capsule 100 according to the present invention. The first steel capsule 100 comprises a first steel capsule wall 11, a first capsule core 12, and a first ceramic ring 13, wherein the first capsule core 12 comprises a carbon dioxide solid adsorbent adsorbing carbon dioxide, and the first ceramic ring 13 is disposed in the middle of the steel capsule 100. When a crack is formed in the concrete structure, the ceramic ring 13 is damaged by stress, so that carbon dioxide separated from the solid adsorbent in the first capsule is diffused to the outside of the capsule, and reacts with calcium ions dissociated in water to generate calcium carbonate, thereby repairing the crack.
The preparation method of the steel capsule can be seen in Chinese patent application 201610169329. X. For example, the steel capsule can be pressed and molded by a mold, then the capsule core material is added into the steel capsule, and finally the ceramic ring is spliced at the groove of the steel capsule.
Although the wall 11 of the first steel capsule 100 is shown in the figures as comprising two ceramic rings 13, it will be appreciated by those skilled in the art that any desired number of ceramic rings may be provided on the first steel capsule wall 11.
In a preferred embodiment, referring to fig. 2, the self-repairing microcapsule concrete capable of fixing carbon dioxide of the present invention further comprises a second steel capsule 200, wherein the second steel capsule 200 comprises a second steel capsule wall 21, a second capsule core 22, and a second ceramic ring 23, wherein the second capsule core 22 comprises a water-heat-generating material, and the second ceramic ring 23 is disposed in the middle of the second steel capsule 200. The structure and manufacturing method of the second steel capsule 200 are similar to those of the first steel capsule 100, and the details are as described above.
The second steel capsule 200 functions to introduce a water-encountering exothermic material, facilitating the separation of carbon dioxide from the solid adsorbent. For example, in one embodiment, the water-swellable material may include calcium oxide. In preparing the self-repairing concrete of the present invention, the first steel capsules 100 and the second steel capsules 200 may be uniformly mixed. After both the first steel capsule 100 and the second steel capsule 200 are broken, calcium oxide is dissolved in water, releasing heat, resulting in a local temperature increase, and carbon dioxide in the first steel capsule 200 is separated from the solid adsorbent. Meanwhile, calcium oxide is dissolved in water to supplement free calcium ions, so that sufficient calcium carbonate can be generated to repair the cracks.
The embodiments described above are presented to enable a person having ordinary skill in the art to make and use the invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments herein, and those skilled in the art can make improvements and modifications within the scope of the present invention based on the disclosure of the present invention without departing from the scope and spirit of the present invention.
Claims (8)
1. The self-repairing microcapsule concrete capable of fixing carbon dioxide comprises self-compacting concrete and a first steel capsule and a second steel capsule which are dispersed in the self-compacting concrete, wherein the first steel capsule comprises a first steel capsule wall, a first capsule core and a first ceramic ring, the first capsule core comprises a carbon dioxide solid adsorbent adsorbing carbon dioxide, and the first ceramic ring is arranged in the middle of the steel capsule; the second steel capsule comprises a second steel capsule wall, a second capsule core and a second ceramic ring, wherein the second capsule core comprises a water-encountering heating material, and the second ceramic ring is arranged in the middle of the second steel capsule; the water-heating material comprises calcium oxide.
2. The carbon dioxide-fixable, self-healing microcapsule concrete of claim 1, wherein the first steel capsule wall further comprises an anti-corrosive coating disposed on an interior surface thereof.
3. The self-repairing microcapsule concrete capable of fixing carbon dioxide as claimed in claim 1, wherein the carbon dioxide solid adsorbent comprises mesoporous materials, molecular sieves and carbonaceous adsorbents.
4. The self-repairing microcapsule concrete capable of fixing carbon dioxide according to claim 1, wherein the carbon dioxide solid adsorbent comprises one or more of attapulgite binder modified 13X molecular sieve adsorbent, carbon nanotubes, activated carbon, MIL-101 material and zeolite imidazolate structural material.
5. The self-repairing microcapsule concrete capable of fixing carbon dioxide as claimed in claim 1, wherein the first ceramic ring has a wall thickness of 0.2-0.3mm and a height of 2-2.5mm, and has an inner diameter the same as that of the first steel capsule wall and is disposed in the middle groove of the first steel capsule wall.
6. The self-repairing microcapsule concrete capable of fixing carbon dioxide as claimed in claim 1, wherein the wall thickness of the second ceramic ring is 0.2-0.3mm, the height is 2-2.5mm, and the inner diameter of the second ceramic ring is the same as that of the second steel capsule wall and is arranged in a middle groove of the second steel capsule wall.
7. The self-repairing microcapsule concrete capable of fixing carbon dioxide according to claim 1, wherein the thickness of the first steel microcapsule wall is 0.2-0.4 mm.
8. The self-repairing microcapsule concrete capable of fixing carbon dioxide according to claim 1, wherein the thickness of the second steel microcapsule wall is 0.2-0.4 mm.
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| CN201710965873.XA CN107500589B (en) | 2017-10-17 | 2017-10-17 | Self-repairing microcapsule concrete capable of fixing carbon dioxide |
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| CN108821690B (en) * | 2018-07-20 | 2021-11-12 | 北京工业大学 | Preparation method of MOF high-performance concrete with high strength and small shrinkage |
| CN111889501A (en) * | 2020-07-02 | 2020-11-06 | 达小莉 | Device for repairing heavy metal soil pollution based on temperature |
| CN113788645B (en) * | 2021-09-24 | 2023-04-25 | 广西源盛矿渣综合利用有限公司 | Self-healing pavement concrete capable of absorbing automobile exhaust |
| CN114669181B (en) * | 2022-03-09 | 2023-01-13 | 中国石油大学(华东) | System for constructing and promoting carbon dioxide and water gas-liquid transfer based on anionic vesicles |
| CN115073055B (en) * | 2022-07-11 | 2023-02-17 | 中建商品混凝土有限公司 | Preparation method of concrete self-repairing microcapsule |
| CN116199446A (en) * | 2023-03-14 | 2023-06-02 | 仲恺农业工程学院 | Green self-healing concrete capsule and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0555238B1 (en) * | 1990-07-20 | 1997-04-02 | E. Khashoggi Industries | Engineered cementitious contaminant barriers and their methods of manufacture |
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| CN102531671A (en) * | 2010-12-31 | 2012-07-04 | 上海杰远环保科技有限公司 | Foaming cement realized through adsorptive material and realizing method thereof |
| CN103043937B (en) * | 2012-12-27 | 2015-12-23 | 同济大学 | The complex capsule underground structure concrete self-repairing system of a kind of built-in aerobic microorganism |
| CN105835466B (en) * | 2016-03-23 | 2017-10-24 | 武汉大学 | A kind of self union concrete containment of anti-nuclear radiation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0555238B1 (en) * | 1990-07-20 | 1997-04-02 | E. Khashoggi Industries | Engineered cementitious contaminant barriers and their methods of manufacture |
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Effective date of registration: 20200518 Address after: Feng Ming Licheng District Lingang Development Zone, 250101 Ji'nan Road, Shandong province No. 1000 Applicant after: FENG, Lin Address before: 256600 the Yellow River Road, Shandong, No. five, No. 391, Binzhou Applicant before: BINZHOU University |
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