CN109437747B - Concrete structure protection material - Google Patents
Concrete structure protection material Download PDFInfo
- Publication number
- CN109437747B CN109437747B CN201811485860.3A CN201811485860A CN109437747B CN 109437747 B CN109437747 B CN 109437747B CN 201811485860 A CN201811485860 A CN 201811485860A CN 109437747 B CN109437747 B CN 109437747B
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- CN
- China
- Prior art keywords
- concrete structure
- concrete
- protection material
- structure protection
- melamine resin
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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
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5024—Silicates
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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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/65—Coating or impregnation with inorganic materials
- C04B41/68—Silicic acid; Silicates
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/16—Sealings or joints
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention discloses a concrete structure protection material, which comprises the following raw material components in percentage by weight: 100 parts of portland cement; 40-100 parts of mineral admixture; 2-6 parts of melamine resin microcapsules; 0.5-1.5 parts of cellulose super absorbent polymer; 120-200 parts of water. The concrete structure protection material integrates self-repairing, high water absorption and anti-corrosion functions, and can be used for pre-coating protection and corrosion prevention of concrete structures in marine environments and self-repairing protection and corrosion prevention of concrete structures after damage, deformation or cracks occur.
Description
Technical Field
The invention relates to a concrete structure protection technology, in particular to a concrete structure protection material.
Background
The additional anti-corrosion measures adopted by the surface layer of the concrete structure with the design protection age within 20 years under the marine environment mainly comprise: surface coatings and silane impregnation, etc. Wherein, the surface coating system can be composed of a bottom layer, a middle layer and a surface layer coating, or composed of a bottom layer and a surface layer coating; the primer can be epoxy resin sealing paint, acrylic resin sealing paint and the like; the intermediate layer coating can use epoxy resin paint and the like; the surface layer coating can use fluorocarbon finish, polysiloxane finish, polyurethane finish, acrylic resin paint, chlorinated rubber paint and the like. Concrete silane impregnation is generally carried out using isooctyltriethoxy paste silane or isobutyltriethoxy liquid silane.
The technical measures for preventing corrosion of the surface layer of the concrete structure in the marine environment are based on the fact that the surface layer of the concrete structure is intact and does not crack, so that the concrete structure can have a good protection effect on corrosion caused by corrosive media such as seawater and salt spray, but the existing technical measures for preventing corrosion of the surface layer are passive protection generally, and once the concrete structure cracks, the protective function of the concrete structure is lost.
Disclosure of Invention
The invention aims to provide a concrete structure protection material which not only can be used for pre-coating protection and corrosion prevention of concrete structures in marine environments, but also can be used for self-repairing protection and corrosion prevention of concrete structures after damage, deformation or cracks occur.
In order to achieve the purpose, the invention adopts the technical scheme that: the concrete structure protection material comprises the following raw material components in percentage by weight:
further, the paint comprises the following bottom layer raw material components in percentage by weight:
further, the Portland cement is P.O42.5-grade ordinary Portland cement, and the specific surface area is 300-400 m2/kg。
Further, the mineral admixture is formed by compounding slag powder and fly ash according to the mass ratio of 1: 1-1: 3, wherein the slag powder is S95-grade slag powder, the fly ash is II-grade fly ash, and the specific surface areas of the fly ash and the slag powder are 400-450 m2/kg。
Furthermore, the melamine resin microcapsule takes melamine resin as a capsule wall, epoxy resin E-51 and a mixture of water glass and sodium oxide are wrapped in the capsule wall to serve as a core material, the particle size of the melamine resin microcapsule is 1-10 mu m, and the mass of the core material accounts for 50-80% of the total mass of the melamine resin microcapsule.
Furthermore, the modulus of the water glass is 1.0-2.0, and the mass of the sodium oxide accounts for 4-7% of the total mass of the mixture of the water glass and the sodium oxide.
Furthermore, the cellulose super absorbent polymer is a super absorbent resin formed by grafting amino acid and acrylamide with sodium carboxymethyl cellulose as a raw material, and the weight ratio of the cellulose super absorbent polymer is as follows: sodium carboxymethylcellulose: amino acids: acrylamide is 1: 2-4: 2 to 4.
The construction method of the concrete structure protection material comprises the following steps:
1) respectively weighing the Portland cement, the mineral admixture, the melamine resin microcapsule, the cellulose super absorbent polymer and the water in corresponding parts by weight according to the weight ratio of the raw material components of the bottom layer for later use;
2) uniformly mixing the weighed Portland cement, mineral admixture, melamine resin microcapsule, cellulose super absorbent polymer and water to obtain a concrete structure protection material;
3) coating the concrete structure protection material on the surface of concrete to be coated, repairing the surface defect of the concrete and curing the surface of the concrete;
4) and after the concrete structure protection material is dried, spraying a layer of chlorinated rubber paint surface protective agent on the concrete structure protection material.
Compared with the prior art, the invention has the following advantages:
firstly, the concrete structure protection material is coated on the surface of concrete, when the surface of the concrete is intact, the self-repairing structure protection material system can play a role in corrosion prevention, particularly when the concrete structure is damaged and deformed or cracks, on one hand, tiny capsules in the material system are broken under the action of crack stress, and bonding materials in the capsules and other self-repairing component materials play a role in cracks; on the other hand, when the crack is large, the whole structure protection material system on the surface of the concrete is damaged, so that corrosive media in seawater or air easily invade into the surface concrete and steel bars in the protection layer to corrode, the high-water-absorptivity high-molecular polymer can absorb a large amount of water, the intelligent repair effect of the self-repairing material is further promoted, the repair of the crack by the self-repairing material system is accelerated, a complete and closed protection layer is formed on the surface of the concrete, and the durability of the concrete and the service life of the structure are improved.
Secondly, the concrete structure protection material integrates self-repairing, high water absorption and anti-corrosion functions, and can be used for pre-coating protection and corrosion prevention of concrete structures in marine environments and self-repairing protection and corrosion prevention of concrete structures after damage deformation or cracks occur.
Thirdly, the concrete structure protection material is simple in composition, can realize factory prefabrication, and can be prepared by firstly coating a layer of concrete structure protection material and then spraying a layer of surface protective agent during field construction.
Detailed Description
The present invention will be described in further detail with reference to specific examples to facilitate the clear understanding of the invention, but the present invention is not limited thereto.
Examples 1-2 and comparative example 1
1) Respectively weighing ordinary portland cement, mineral admixture, melamine resin microcapsule, cellulose super absorbent polymer and water according to the weight ratio of the raw materials of the bottom layer for later use. Wherein the raw materials are prepared as follows:
the Portland cement is P.O42.5 grade Portland cement of Ningbo ring novel building material Co., Ltd, and has a specific surface area of 360m2The initial setting time is 199min, the final setting time is 252min, the 3d compressive strength and the 3d flexural strength are 26.9MPa and 5.7MPa respectively, and the 28d compressive strength and the 28d flexural strength are 51.8MPa and 8.0MPa respectively;
the weight ratio of the fly ash to the slag powder in the mineral admixture is 2, the fly ash is class II fly ash of Ningbo Beilun Tianlu building materials trade Limited company, the fineness is 23.5%, the loss on ignition is 7.9%, the water demand ratio is 104%, and the 28d activity index is 74%; the slag powder is S95 grade mineral powder of Zhangjiagang Changchang novel building material GmbH, the specific surface area is 414m2/kg, the ignition loss is 0.8 percent, the water demand is 98 percent, the fluidity is 102 percent, and the 28d activity index is 99 percent;
the melamine resin microcapsule is produced by Miao Shuanghang Wuhan Bay new material Co., Ltd, the capsule wall particle size is 5 μm, and the weight of the core material accounts for 70% of the total weight of the microcapsule. Wherein, the core material comprises two components, one is epoxy resin E-51, the other is a mixture of water glass and sodium oxide, the modulus of the water glass is 1.5, and the content of the sodium oxide is 6%;
the cellulose super absorbent polymer is produced by Miao Shuanghang Wuhan estuary new material, the deionized water absorption rate of the prepared super absorbent polymer is 545.2g/g, the tap water absorption rate is 100.2g/g, and the physiological saline absorption rate is 40.5 g/g;
the mixed water is clean tap water.
2) Uniformly mixing weighed ordinary portland cement, mineral admixture, melamine resin microcapsules, cellulose super absorbent polymer and water by adopting a manual or mortar mixer to obtain a concrete structure protection material;
3) coating the concrete structure protection material on the surface of concrete to be coated, repairing the surface defects of the concrete and maintaining the surface of the concrete, wherein the age of the concrete to be coated is not less than 28 days and the concrete is qualified; the surface of the concrete to be coated is not adhered with chips, dust, oil stains, concrete curing agents and the like; in order to enhance the adhesion effect, a layer of interface modifier can be coated on the surface of the concrete, and after the interface modifier is dried, the concrete structure protection material is coated on the surface of the concrete;
4) after the concrete structure protection material is dried, spraying a layer of chlorinated rubber paint surface protective agent with the thickness of 200 mu m on the concrete structure protection material.
The raw materials and the corresponding component proportions thereof and the construction method are adopted in the embodiments 1 to 2, the raw materials and the corresponding component proportions thereof are used for pre-coating protection corrosion prevention of a concrete structure in an ocean environment and self-repairing protection corrosion prevention of the concrete structure after damage deformation or cracks appear, the comparative example 1 is a structure protection material system which is prepared by adopting the raw materials and the construction method but is not prepared according to the proportion of the invention, and the weight proportions of the raw materials in the embodiments 1 to 2 and the comparative example 1 are shown in the following table 1:
TABLE 1
The main performance parameters of the concrete structure protective materials prepared in examples 1-2 and comparative example 1 are shown in table 2:
TABLE 2
As can be seen from Table 2, the flexural strength at 28d and the compressive strength at 28d of comparative example 1, which are not in the weight ratio of the invention, are significantly reduced compared with those of examples 1-2, and the chloride ion permeation resistance is also reduced.
After 56d, prepressing the examples 1-2 and the comparative example 1, wherein the prepressing value is 80% of the compressive strength of the samples to enable the samples to generate microcracks, then, carrying out standard maintenance on the prepressed samples, and testing the compressive strength and the corrosion resistance of the samples after 7d of prepressing maintenance, wherein after the concrete structure protective materials are used for repairing the microcracks, the compressive strength and the chlorine ion permeation resistance of the examples 1-2 and the comparative example 1 are improved, but the compressive strength and the chlorine ion permeation resistance of the example 2 are increased most, and compared with the comparative example 1, the corrosion resistance of the examples 1-2 is increased relatively more. Therefore, the self-repairing protective coating used for pre-coating protection and corrosion prevention of the concrete structure in the marine environment and self-repairing protection and corrosion prevention of the concrete structure after damage deformation or cracks occur has good performance indexes, good feasibility and applicability, and self-repairing performance which is not possessed by other materials, solves the problem that the traditional surface layer corrosion prevention technology loses the corrosion prevention function after the concrete structure cracks, and ensures the quality of bridges, tunnels and port engineering.
Claims (5)
1. A concrete structure protection material is characterized in that: comprises the following raw material components in percentage by weight:
the mineral admixture is formed by compounding slag powder and fly ash according to the mass ratio of 1: 1-1: 3, wherein the slag powder is S95-grade slag powder, the fly ash is II-grade fly ash, and the specific surface areas of the fly ash and the slag powder are 400-450 m2/kg；
The melamine resin microcapsule takes melamine resin as a capsule wall, epoxy resin E-51, a mixture of water glass and sodium oxide as a core material are wrapped in the capsule wall, the particle size of the melamine resin microcapsule is 1-10 mu m, and the mass of the core material accounts for 50-80% of the total mass of the melamine resin microcapsule;
the cellulose super absorbent polymer is a super absorbent resin formed by grafting amino acid and acrylamide with sodium carboxymethylcellulose as a raw material, and the weight ratio of the cellulose super absorbent polymer is as follows: sodium carboxymethylcellulose: amino acids: acrylamide is 1: 2-4: 2 to 4.
2. The concrete structure protection material according to claim 1, wherein: comprises the following raw material components in percentage by weight:
3. the concrete structure protection material according to claim 1 or 2, wherein: the Portland cement is P.O42.5-grade ordinary Portland cement, and the specific surface area is 300-400 m2/kg。
4. The concrete structure protection material according to claim 1, wherein: the modulus of the water glass is 1.0-2.0, and the mass of the sodium oxide accounts for 4-7% of the total mass of the mixture of the water glass and the sodium oxide.
5. The method of constructing a concrete structure protective material according to claim 1, wherein: the method comprises the following steps:
1) respectively weighing the Portland cement, the mineral admixture, the melamine resin microcapsule, the cellulose super absorbent polymer and the water in corresponding parts by weight according to the weight ratio of the raw material components of the bottom layer for later use;
2) uniformly mixing the weighed Portland cement, mineral admixture, melamine resin microcapsule, cellulose super absorbent polymer and water to obtain a concrete structure protection material;
3) coating the concrete structure protection material on the surface of concrete to be coated, repairing the surface defect of the concrete and curing the surface of the concrete;
4) and after the concrete structure protection material is dried, spraying a layer of chlorinated rubber paint surface protective agent on the concrete structure protection material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811485860.3A CN109437747B (en) | 2018-12-06 | 2018-12-06 | Concrete structure protection material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811485860.3A CN109437747B (en) | 2018-12-06 | 2018-12-06 | Concrete structure protection material |
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| Publication Number | Publication Date |
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| CN109437747A CN109437747A (en) | 2019-03-08 |
| CN109437747B true CN109437747B (en) | 2021-07-06 |
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| CN110981404B (en) * | 2019-11-29 | 2021-11-12 | 南京绿色增材智造研究院有限公司 | Ultra-high-ductility cement-based material for repairing and reinforcing |
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| CN101041577A (en) * | 2006-03-23 | 2007-09-26 | 同济大学 | Polystyrene foam particle heat-insulating mortar |
| CN101239800A (en) * | 2008-03-07 | 2008-08-13 | 哈尔滨工业大学 | Carbon nano-tube enhanced cement-base composite material and preparation method thereof |
| WO2010112197A1 (en) * | 2009-03-30 | 2010-10-07 | J. Rettenmaier & Söhne Gmbh + Co. Kg | Fibrous material as an additive for a construction product |
| CN103030329A (en) * | 2013-01-05 | 2013-04-10 | 上海富春建业科技股份有限公司 | Enhanced admixture for municipal refuse recycled concrete as well as preparation method thereof and application thereof |
| CN107473675A (en) * | 2017-08-03 | 2017-12-15 | 青岛理工大学 | GO and the scattered CNT modified Nano construction materials of nanometer miberal powder collaboration and preparation method and application |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020117086A1 (en) * | 2000-12-19 | 2002-08-29 | Caijun Shi | Low shrinkage, high strength cellular lightweight concrete |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101041577A (en) * | 2006-03-23 | 2007-09-26 | 同济大学 | Polystyrene foam particle heat-insulating mortar |
| CN101239800A (en) * | 2008-03-07 | 2008-08-13 | 哈尔滨工业大学 | Carbon nano-tube enhanced cement-base composite material and preparation method thereof |
| WO2010112197A1 (en) * | 2009-03-30 | 2010-10-07 | J. Rettenmaier & Söhne Gmbh + Co. Kg | Fibrous material as an additive for a construction product |
| CN103030329A (en) * | 2013-01-05 | 2013-04-10 | 上海富春建业科技股份有限公司 | Enhanced admixture for municipal refuse recycled concrete as well as preparation method thereof and application thereof |
| CN107473675A (en) * | 2017-08-03 | 2017-12-15 | 青岛理工大学 | GO and the scattered CNT modified Nano construction materials of nanometer miberal powder collaboration and preparation method and application |
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