CN108409183B - Sodium silicate self-repairing concrete structure - Google Patents
Sodium silicate self-repairing concrete structure Download PDFInfo
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- CN108409183B CN108409183B CN201810498359.4A CN201810498359A CN108409183B CN 108409183 B CN108409183 B CN 108409183B CN 201810498359 A CN201810498359 A CN 201810498359A CN 108409183 B CN108409183 B CN 108409183B
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- concrete
- concrete structure
- self
- solution
- cracks
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- 239000004567 concrete Substances 0.000 title claims abstract description 77
- 239000004115 Sodium Silicate Substances 0.000 title claims abstract description 22
- 229910052911 sodium silicate Inorganic materials 0.000 title claims abstract description 22
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 239000011521 glass Substances 0.000 claims abstract description 35
- 239000012510 hollow fiber Substances 0.000 claims abstract description 35
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 20
- 239000007853 buffer solution Substances 0.000 claims abstract description 19
- 239000000243 solution Substances 0.000 claims abstract description 17
- 239000011259 mixed solution Substances 0.000 claims abstract description 15
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical class [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 12
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 8
- 229920005989 resin Polymers 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 7
- 229920001567 vinyl ester resin Polymers 0.000 claims description 7
- FYFFGSSZFBZTAH-UHFFFAOYSA-N methylaminomethanetriol Chemical compound CNC(O)(O)O FYFFGSSZFBZTAH-UHFFFAOYSA-N 0.000 claims description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000008439 repair process Effects 0.000 abstract description 4
- 239000011150 reinforced concrete Substances 0.000 abstract 2
- 239000013078 crystal Substances 0.000 abstract 1
- 238000002161 passivation Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 4
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 239000010902 straw Substances 0.000 description 3
- 239000000378 calcium silicate Substances 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 239000007983 Tris buffer Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229960004887 ferric hydroxide Drugs 0.000 description 1
- -1 hydroxyl ions Chemical class 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Classifications
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Aftertreatments Of Artificial And Natural Stones (AREA)
- Working Measures On Existing Buildindgs (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a sodium silicate self-repairing concrete structure, which comprises a concrete member, wherein a plurality of glass micro-suction pipes with sealed two ends are uniformly distributed in the concrete structure, a plurality of hollow fibers with sealed two ends are placed in a cavity of each glass micro-suction pipe, sodium silicate or sodium carbonate solution is stored in each hollow fiber, mixed solution is stored in other areas of the cavity of each glass micro-suction pipe, and the mixed solution comprises: buffer solution with the mass percentage content of 20-30 percent and saturated calcium hydroxide solution with the mass percentage content of 70-80 percent. The invention can autonomously sense and repair tiny cracks, when the cracks penetrate through the glass micropipette and the hollow fiber, the solution in the cracks can flow out to react with each other or react with concrete to generate crystals to fill the cracks, thereby realizing the self-repair of the cracks of the concrete, simultaneously slowing down the corrosion process of the reinforcing steel bar, improving the durability of the reinforced concrete structure, prolonging the service life of the reinforced concrete structure and improving the economy of the concrete.
Description
Technical Field
The invention relates to a sodium silicate self-repairing concrete structure, belonging to the field of self-repairing concrete and similar building materials thereof.
Background
In the use process of the concrete, cracks are inevitably generated due to factors such as environment, temperature difference and the like, so that a channel for harmful ions to enter the concrete is provided, and the durability of the structure is reduced. The traditional method for repairing the concrete macroscopic cracks by adopting the repairing material not only increases the cost, but also has poor effect on early cracks. In an actual concrete engineering structure, a plurality of micro cracks occur in the structure, and if the micro-scale damage can be timely and effectively repaired before the micro cracks develop, the later repair or maintenance cost can be greatly reduced. Therefore, effective repair of cracks or loss of structure is a major concern.
In recent years, many suitable and effective restoratives have been developed and found with significant success. However, in the actual self-repairing process, most reactions need to consume calcium ions and hydroxyl ions in the concrete, so that the pH value of the concrete is reduced. In the environment of high alkalinity, the surface of the steel bar is deposited with a layer of compact ferric hydroxide film and turns into a passivation state, and even if air and water enter, the corrosion of the steel bar cannot be caused. When the liquid phase alkalinity of the concrete is reduced due to the action of external factors, the reinforcing steel bars are converted from a passivation state to an active state, and if air and water enter the reinforcing steel bars, the passivation film is damaged, and the reinforcing steel bars begin to rust. Therefore, most self-repair processes reduce the alkalinity of the concrete, thereby increasing the likelihood of corrosion of the steel reinforcement.
Disclosure of Invention
In view of this, the present invention provides a sodium silicate self-repairing concrete structure, which solves the problem of the alkali reduction of concrete in the self-repairing process, and reduces the corrosion possibility of steel bars.
The invention is realized by adopting the following scheme:
the utility model provides a sodium silicate self-repairing concrete structure, includes the concrete component, evenly distributed has a plurality of both ends sealed glass micropipettes in the concrete structure, the cavity of glass micropipette in place a plurality of both ends sealed hollow fiber, sodium silicate or sodium carbonate solution have been stored in the hollow fiber, mixed solution is stored in other regions of cavity of glass micropipette, mixed solution includes: 20-30% of buffer solution and 70-80% of saturated calcium hydroxide solution.
Further, the concrete material of the concrete member is C30 concrete.
Further, both ends of the hollow fiber are sealed with a vinyl ester resin 4.
Furthermore, the diameter of the glass micropipette is 1100-1200 μm,
further, the hollow rate of the glass micropipette is 80-90%.
Further, the diameter of the hollow fiber is 170-540 μm,
further, the hollow fiber has a hollow ratio of 30 to 50%.
Further, the buffer solution is tris (hydroxymethyl) aminomethane.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the sodium silicate solution is added into the concrete to meet the restoration function; buffer solution tris (hydroxymethyl) aminomethane is added to maintain the pH value of the concrete within a certain range, protect reinforcing steel bars in the concrete, protect passive films of the reinforcing steel bars and reduce the possibility of being corroded by external harmful substances; adding saturated calcium hydroxide solution to supplement calcium hydroxide consumed in concrete due to repair, so that the pH value of the concrete is not changed too much, and a passivation film for protecting the reinforcing steel bars is protected; the sodium carbonate solution is added to enhance the repairing effect of the repairing material, provide carbonate ions required by crystallization, and simultaneously effectively regulate and improve the development of the slurry structure.
2. When the concrete cracks and penetrates through the hollow fibers, the sodium silicate solution stored in the hollow fibers can react with calcium hydroxide in the concrete or calcium hydroxide in the glass micropipette to generate hydrated calcium silicate, so that the cracks are repaired, the capacity of automatically repairing the cracks is realized, and the manpower and financial resources for repairing the cracks are saved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
FIG. 2 is a schematic view of a glass micropipette configuration in accordance with an embodiment of the present invention.
FIG. 3 is a schematic view of a hollow fiber configuration of an embodiment of the present invention
The reference numbers in the figures illustrate: 1-concrete member, 2-glass micropipette, 3-sodium silicate solution or sodium carbonate solution, 4-vinyl ester resin, 5-hollow fiber and 6-mixed solution.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to specific embodiments and accompanying drawings.
Example one
As shown in fig. 1 to 3, a sodium silicate self-repairing concrete structure includes a concrete member 1, a plurality of glass micro-suction pipes 2 with sealed two ends are uniformly distributed in the concrete structure 1, the concrete material of the concrete member 1 is C30 concrete, a plurality of hollow fibers 5 with sealed two ends are placed in a cavity of the glass micro-suction pipe 2, a mixed solution 6 is stored in other areas of the cavity of the glass micro-suction pipe 2, and the mixed solution 6 includes: the buffer solution comprises 20% by mass percentage of buffer solution and 80% by mass percentage of saturated calcium hydroxide solution, wherein the buffer solution is tris (hydroxymethyl) aminomethane. The hollow fiber 5 stores sodium silicate or sodium carbonate solution 3, and two ends of the hollow fiber 5 are sealed by vinyl ester resin 4. The diameter of the glass micropipette 2 is 1100 mu m, and the hollow rate is 80-90%. The diameter of the hollow fiber 5 is 170 μm, and the hollow rate is 30-50%.
Example two
As shown in fig. 1 to 3, a sodium silicate self-repairing concrete structure comprises a concrete member 1, wherein a plurality of glass micro-suction pipes 2 with two sealed ends are uniformly distributed in the concrete structure 1. The concrete material of the concrete member 1 is C30 concrete. A plurality of hollow fibers 5 with two sealed ends are arranged in the cavity of the glass micro-suction pipe 2. The other area of the cavity of the glass micropipette 2 stores a mixed solution 6, and the mixed solution 6 comprises: the buffer solution comprises 30% of buffer solution and 70% of saturated calcium hydroxide solution by mass percentage, wherein the buffer solution is trihydroxymethyl aminomethane. The hollow fiber 5 stores a sodium silicate or sodium carbonate solution 3. The hollow fibers 5 are sealed at both ends with a vinyl ester resin 4. The diameter of the glass micropipette 2 is 1100 mu m, and the hollow rate is 80-90%. The diameter of the hollow fiber 5 is 360 μm, and the hollow rate is 30-50%.
EXAMPLE III
As shown in fig. 1 to 3, a sodium silicate self-repairing concrete structure comprises a concrete member 1, wherein a plurality of glass micro-suction pipes 2 with two sealed ends are uniformly distributed in the concrete structure 1. The concrete material of the concrete member 1 is C30 concrete. A plurality of hollow fibers 5 with two sealed ends are placed in the cavity of the glass micro-straw 2. The other area of the cavity of the glass micropipette 2 stores a mixed solution 6, wherein the mixed solution 6 comprises: the buffer solution comprises 20% of buffer solution and 80% of saturated calcium hydroxide solution by mass percentage, wherein the buffer solution is trihydroxymethyl aminomethane. The hollow fiber 5 stores a sodium silicate or sodium carbonate solution 3. The hollow fibers 5 are sealed at both ends with a vinyl ester resin 4. The diameter of the glass micropipette 2 is 1200 mu m, and the hollow rate is 80-90%. The diameter of the hollow fiber 5 is 360 μm, and the hollow rate is 30-50%.
Example four
As shown in fig. 1 to 3, a sodium silicate self-repairing concrete structure comprises a concrete member 1, wherein a plurality of glass micro-suction pipes 2 with two sealed ends are uniformly distributed in the concrete structure 1. The concrete material of the concrete member 1 is C30 concrete. A plurality of hollow fibers 5 with two sealed ends are arranged in the cavity of the glass micro-suction pipe 2. The other area of the cavity of the glass micropipette 2 stores a mixed solution 6, and the mixed solution 6 comprises: the buffer solution comprises 30% by mass percentage of buffer solution and 70% by mass percentage of saturated calcium hydroxide solution, wherein the buffer solution is tris (hydroxymethyl) aminomethane. The hollow fiber 5 stores a sodium silicate or sodium carbonate solution 3. The hollow fibers 5 are sealed at both ends with a vinyl ester resin 4. The diameter of the glass micropipette 2 is 1200 mu m, and the hollow rate is 80-90%. The diameter of the hollow fiber 5 is 540 μm, and the hollow rate is 30 to 50%.
When the concrete member 1 of the above embodiment cracks due to external force or environmental factors and the cracks penetrate through the glass micro-straw 2, the hollow fibers 5 are broken, and the sodium carbonate solution or the sodium silicate solution 3 seeps out of the broken parts of the hollow fibers 5 and enters the cracks of the concrete member 1, so that the calcium silicate hydrate gel is generated by reaction with the concrete of the concrete member 1 or the saturated calcium hydroxide solution in the cavity of the glass micro-straw 2, and finally the cracks on the concrete member 1 are repaired to prevent the expansion, thereby having extremely high environmental protection and economical efficiency. Meanwhile, the buffer solution tris can control the pH value of the concrete within a certain range, so that the passivation film of the steel bar is protected, and the possibility that the passivation film is damaged is reduced.
In the present embodiment, the above-mentioned embodiments further illustrate the objects, technical solutions and advantages of the present invention, and it should be noted that the above-mentioned further embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A sodium silicate self-repairing concrete structure is characterized in that: including concrete member (1), evenly distributed has sealed glass micropipette (2) in a plurality of both ends in concrete member (1), the cavity of glass micropipette (2) in place the sealed hollow fiber (5) in a plurality of both ends, sodium silicate or sodium carbonate solution (3) have been stored in hollow fiber (5), mixed solution (6) have been stored in other regions of cavity of glass micropipette (2), mixed solution (6) include: 20-30% of buffer solution and 70-80% of saturated calcium hydroxide solution.
2. The self-repairing concrete structure of claim 1, wherein: the concrete material of the concrete member (1) is C30 concrete.
3. The self-repairing concrete structure of claim 1, wherein: the two ends of the hollow fiber (5) are sealed by vinyl ester resin (4).
4. The self-repairing concrete structure of claim 1, wherein: the diameter of the glass micropipette (2) is 1100-1200 mu m.
5. The self-repairing concrete structure of claim 4, wherein: the hollow rate of the glass micropipette (2) is 80-90%.
6. The self-repairing concrete structure of claim 1, wherein: the diameter of the hollow fiber (5) is 170-540 μm.
7. The self-repairing concrete structure of claim 6, wherein: the hollow fiber (5) has a hollow ratio of 30 to 50%.
8. The self-repairing concrete structure of claim 1, wherein: the buffer solution is trihydroxymethyl aminomethane.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810498359.4A CN108409183B (en) | 2018-05-23 | 2018-05-23 | Sodium silicate self-repairing concrete structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810498359.4A CN108409183B (en) | 2018-05-23 | 2018-05-23 | Sodium silicate self-repairing concrete structure |
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| CN108409183A CN108409183A (en) | 2018-08-17 |
| CN108409183B true CN108409183B (en) | 2022-12-16 |
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| CN201810498359.4A Expired - Fee Related CN108409183B (en) | 2018-05-23 | 2018-05-23 | Sodium silicate self-repairing concrete structure |
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| CN111592366B (en) * | 2020-04-28 | 2022-04-29 | 河南九环实业发展有限公司 | Environment-friendly multi-element nano wear-resistant corrosion-resistant vitrified lining material |
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| CN204492219U (en) * | 2015-02-03 | 2015-07-22 | 福州大学 | A kind of self-repair concrete structure |
| CN104829156A (en) * | 2015-04-01 | 2015-08-12 | 中国矿业大学 | Formula and preparation method of impermeable waterproof concrete repairing agent |
| JP3207825U (en) * | 2016-08-10 | 2016-12-08 | 前田工繊株式会社 | Self-healing concrete structures |
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| CN208717174U (en) * | 2018-05-23 | 2019-04-09 | 华南理工大学 | A kind of structure of self-repair concrete containing doughnut |
-
2018
- 2018-05-23 CN CN201810498359.4A patent/CN108409183B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101386508A (en) * | 2008-10-24 | 2009-03-18 | 王可良 | Formula of concrete creak self-repair material and preparation technology |
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| JP3207825U (en) * | 2016-08-10 | 2016-12-08 | 前田工繊株式会社 | Self-healing concrete structures |
| CN106946518A (en) * | 2017-01-09 | 2017-07-14 | 华南理工大学 | A kind of accelerated cement base infiltration crystallization type selfreparing waterproof material and preparation method thereof |
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| Title |
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