CN112047681A - Anti-corrosion cement-based protective coating for wading concrete structure and preparation method thereof - Google Patents
Anti-corrosion cement-based protective coating for wading concrete structure and preparation method thereof Download PDFInfo
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- CN112047681A CN112047681A CN202010836385.0A CN202010836385A CN112047681A CN 112047681 A CN112047681 A CN 112047681A CN 202010836385 A CN202010836385 A CN 202010836385A CN 112047681 A CN112047681 A CN 112047681A
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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
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
- C04B2111/00155—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
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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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Aftertreatments Of Artificial And Natural Stones (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses an anti-corrosion cement-based protective coating for a wading concrete structure and a preparation method thereof, wherein the cement-based protective coating comprises the following raw materials in parts by weight: 40-50 parts of cement, 10-15 parts of fly ash, 15-20 parts of silica fume, 65-80 parts of quartz sand, 12-18 parts of water, 1.5-2 parts of water reducing agent, 0.5-1 part of expanding agent and 2-3 parts of accelerating agent. After polishing the original concrete structure surface layer, the spraying method is adopted to apply the concrete structure surface layer. The coating has good compatibility with concrete, and can enhance the calcium corrosion resistance of the surface of a concrete structure.
Description
Technical Field
The invention belongs to the field of hydraulic concrete calcium corrosion protection, and particularly relates to an anti-corrosion cement-based protective coating for a wading concrete structure and a preparation method thereof.
Technical Field
The total amount of water resources in China is rich, but the water resources are not uniformly distributed in time and space. In order to fully develop and utilize water resources in various regions and prevent and control flood disasters. A large number of hydraulic engineering is built in China, and numerous wading concrete structures appear, including long water delivery tunnels for water transfer across drainage basins, large-scale reservoirs for flood control and water storage, dams and the like. These are all the civil engineering, the service life of the structure is long, and higher requirements are put forward for durability.
The structure of the water-involved concrete is exposed to the atmosphere and water environment for a long time, and the water can have a plurality of adverse effects on the concrete. Under the long-term action of flowing water, the concrete often has the problem of calcium corrosion. Because the ion concentration in the water environment is low, the ion concentration difference exists inside and outside the concrete, and calcium ions in the concrete can be lost into the water environment. Under the running water environment, if the concrete is not treated, the calcium precipitation of the concrete can be continuously carried out.
In order to solve the problem of concrete calcium corrosion, the most fundamental is to improve the compactness of the concrete and reduce the porosity, but the compactness is difficult to improve due to more conditions. Particularly for already built structures, it is suitable to provide effective protection at the concrete-water contact surface.
At present, the economical and effective method is to coat asphalt and epoxy hydrophobic materials on the surface of concrete. However, such coatings have high requirements for concrete substrates and require compaction, cleanliness and drying, and therefore, poor concrete substrates need to be repaired and air-dried first. Meanwhile, chemical materials coated on the surface of concrete have the problems of mottle, peeling and the like, and the chemical coatings are not safe to use under the condition of high water quality requirement.
Disclosure of Invention
In order to solve the problems, the invention provides the anti-corrosion cement-based protective coating for the wading concrete structure and the preparation method thereof.
The invention provides an anti-corrosion cement-based protective coating for a wading concrete structure, which comprises the following raw materials in parts by weight: 40-50 parts of cement, 10-15 parts of fly ash, 15-20 parts of silica fume, 65-80 parts of fine aggregate, 12-18 parts of water, 1.5-2 parts of water reducing agent, 0.5-1 part of expanding agent and 2-3 parts of accelerating agent.
Further, the cement is 52.5-grade ordinary portland cement.
Further, the fly ash is ultrafine fly ash.
Furthermore, the silica fume is superfine silica fume, and the particle size is less than or equal to 1 mu m.
Further, the grading of the cementing material is 0.1 mu m-1 mm.
Further, the fine aggregate is quartz sand with the particle size of 0.1mm-0.5 mm.
Further, the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent.
Further, the swelling agent is a plastic swelling agent.
Further, the accelerator is an alkali-free accelerator.
The invention also provides a preparation method of the anti-corrosion cement-based protective coating for the wading concrete structure, which comprises the following steps: determining the use amount of each raw material according to the mixing proportion, respectively weighing, putting the raw materials into a stirrer in sequence of fine aggregate, cement, fly ash and silica fume, uniformly stirring, dissolving a water reducing agent, an expanding agent and an accelerating agent into half of water, adding the water reducing agent, the expanding agent and the accelerating agent into the stirrer, uniformly stirring, finally adding the other half of water, and fully stirring to obtain the anti-corrosion cement-based protective coating for the wading concrete structure.
Has the advantages that:
the corrosion-resistant cement-based protective coating for the wading concrete structure has good expansibility, good fluidity and small viscosity, and is suitable for the existing spraying technology. The cement-based protective coating is concrete in nature and is more environment-friendly. Compared with chemical materials, the material is safer and more reliable. After the existing concrete matrix is simply treated, the concrete matrix is sprayed on the existing concrete matrix, on one hand, the damaged part is repaired, and on the other hand, a protective outer layer is formed. The concrete has good compatibility with the existing concrete material, high strength and good toughness, is not easy to peel off, mottle and the like, and can realize long-term and effective protection.
Drawings
FIG. 1 is a schematic view of the corrosion-resistant cement-based protective coating for a wading concrete structure according to the present invention sprayed on the wading concrete.
In the figure, 1 is wading concrete; 2 is a protective coating formed by spraying anti-corrosion cement-based protective coating for the wading concrete structure.
Detailed Description
The practice of the invention is further illustrated below.
The cement used in the following examples is 52.5-grade ordinary portland cement, the fly ash is ultrafine fly ash, the silica fume is ultrafine silica fume, the particle size is less than or equal to 1 μm, the grading of the cementing material is 0.1 μm-1mm, the fine aggregate is quartz sand with the particle size of 0.1mm-0.5mm,
the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent, the expanding agent is a plastic expanding agent, and the accelerating agent is an alkali-free accelerating agent. The raw materials can be purchased from the market.
Example 1
An anti-corrosion cement-based protective coating for a wading concrete structure comprises the following components in parts by weight: 40 parts of cement, 10 parts of fly ash, 15 parts of silica fume, 65 parts of quartz sand, 12 parts of water, 1.5 parts of a water reducing agent, 0.5 part of an expanding agent and 2 parts of an accelerating agent. Determining the use amount of each raw material according to the mixing proportion, respectively weighing, putting the raw materials into a stirrer in sequence of fine aggregate, cement, fly ash and silica fume, forcibly stirring for 4min, dissolving a water reducing agent, an expanding agent and an accelerating agent into half of water, then adding the mixture into the stirrer, continuously stirring for 3min, finally adding the other half of water, and fully stirring to obtain the anti-corrosion cement-based protective coating for the wading concrete structure.
Example 2
An anti-corrosion cement-based protective coating for a wading concrete structure comprises the following components in parts by weight: 45 parts of cement, 12 parts of fly ash, 18 parts of silica fume, 70 parts of quartz sand, 15 parts of water, 1.8 parts of water reducing agent, 0.8 part of expanding agent and 2.5 parts of accelerating agent. Determining the use amount of each raw material according to the mixing proportion, respectively weighing, putting the raw materials into a stirrer in sequence of fine aggregate, cement, fly ash and silica fume, forcibly stirring for 4min, dissolving a water reducing agent, an expanding agent and an accelerating agent into half of water, then adding the mixture into the stirrer, continuously stirring for 3min, finally adding the other half of water, and fully stirring to obtain the anti-corrosion cement-based protective coating for the wading concrete structure.
Example 3
An anti-corrosion cement-based protective coating for a wading concrete structure comprises the following components in parts by weight: 50 parts of cement, 15 parts of fly ash, 20 parts of silica fume, 80 parts of quartz sand, 18 parts of water, 2 parts of water reducing agent, 1 part of expanding agent and 3 parts of accelerating agent. Determining the use amount of each raw material according to the mixing proportion, respectively weighing, putting the raw materials into a stirrer in sequence of fine aggregate, cement, fly ash and silica fume, forcibly stirring for 4min, dissolving a water reducing agent, an expanding agent and an accelerating agent into half of water, then adding the mixture into the stirrer, continuously stirring for 3min, finally adding the other half of water, and fully stirring to obtain the anti-corrosion cement-based protective coating for the wading concrete structure.
Example 4
The contact surface of the existing concrete and water is polished to remove the loose and mottled part damaged on the surface, so that the surface of the original concrete is basically flat.
The corrosion-resistant cement-based protective coating for the wading concrete structure is prepared according to the embodiment. The concrete is uniformly and completely sprayed on the surface of the concrete (the wading concrete structure) after being polished by a spraying device. And after construction, maintaining to obtain a compact protective layer with good protective performance, wherein the thickness of the coating is 2-5 mm, as shown in figure 1.
The invention improves the component proportion of the existing cement-based material, so that the cement-based material is uniform and compact, has small porosity, large fluidity, good ductility, small cohesiveness and good calcium corrosion resistance, is suitable for spraying equipment and can be applied to spraying. Compared with the existing problems of mottle, peeling and the like of concrete calcium corrosion protection (chemical coating), the corrosion-resistant cement-based protective coating can not only protect calcium corrosion but also repair the existing damaged surface of the wading concrete when being coated on the surface of the wading concrete. The concrete has good compatibility with the existing concrete material, high strength and good toughness, is not easy to peel off, mottle and the like, and can realize long-term and effective protection.
The present invention is not limited to the above-described embodiments, and modifications and variations are possible, and all modifications and alterations made within the spirit of the present invention are within the scope of the present invention.
Claims (10)
1. The corrosion-resistant cement-based protective coating for the wading concrete structure is characterized by comprising the following raw materials in parts by weight: 40-50 parts of cement, 10-15 parts of fly ash, 15-20 parts of silica fume, 65-80 parts of fine aggregate, 12-18 parts of water, 1.5-2 parts of water reducing agent, 0.5-1 part of expanding agent and 2-3 parts of accelerating agent.
2. The anti-corrosion cement-based protective coating for the wading concrete structure according to claim 1, wherein the cement is 52.5-grade ordinary portland cement.
3. The anti-corrosion cement-based protective coating for the wading concrete structure as claimed in claim 1, wherein the fly ash is ultrafine fly ash.
4. The anti-corrosion cement-based protective coating for the wading concrete structure according to claim 1, wherein the silica fume is ultrafine silica fume with a particle size of less than or equal to 1 μm.
5. The corrosion-resistant cement-based protective coating for the wading concrete structure according to claim 1, wherein the grading of the cementing material is 0.1 μm to 1 mm.
6. The anti-corrosion cement-based protective coating for the wading concrete structure according to claim 1, wherein the fine aggregate is quartz sand with a particle size of 0.1mm to 0.5 mm.
7. The anti-corrosion cement-based protective coating for the wading concrete structure according to claim 1, wherein the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent.
8. The corrosion-resistant cement-based protective coating for the water-involved concrete structure according to claim 1, wherein the expanding agent is a plastic expanding agent.
9. The corrosion-resistant cement-based protective coating for the wading concrete structure according to claim 1, wherein the accelerator is an alkali-free accelerator.
10. The method for preparing the anti-corrosion cement-based protective coating for the wading concrete structure according to claims 1 to 9, which is characterized by comprising the following steps: determining the use amount of each raw material according to the mixing proportion, respectively weighing, putting the raw materials into a stirrer in sequence of fine aggregate, cement, fly ash and silica fume, uniformly stirring, dissolving a water reducing agent, an expanding agent and an accelerating agent into half of water, adding the water reducing agent, the expanding agent and the accelerating agent into the stirrer, uniformly stirring, finally adding the other half of water, and fully stirring to obtain the anti-corrosion cement-based protective coating for the wading concrete structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010836385.0A CN112047681A (en) | 2020-08-19 | 2020-08-19 | Anti-corrosion cement-based protective coating for wading concrete structure and preparation method thereof |
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| CN202010836385.0A CN112047681A (en) | 2020-08-19 | 2020-08-19 | Anti-corrosion cement-based protective coating for wading concrete structure and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113277786A (en) * | 2021-06-03 | 2021-08-20 | 郑州大学 | High-durability coating protection cement-based composite material and preparation method and application thereof |
| CN114890734A (en) * | 2022-04-26 | 2022-08-12 | 陕西交通控股集团有限公司 | Calcium corrosion resistant cement-based material for concrete and preparation method and application thereof |
| CN115286331A (en) * | 2022-07-19 | 2022-11-04 | 山东水总有限公司 | Concrete for lining water delivery tunnel and production process thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113277786A (en) * | 2021-06-03 | 2021-08-20 | 郑州大学 | High-durability coating protection cement-based composite material and preparation method and application thereof |
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| CN115286331A (en) * | 2022-07-19 | 2022-11-04 | 山东水总有限公司 | Concrete for lining water delivery tunnel and production process thereof |
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Application publication date: 20201208 |