KR101675881B1 - Method for reinforcing the degradation part of concrete structures - Google Patents
Method for reinforcing the degradation part of concrete structures Download PDFInfo
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- KR101675881B1 KR101675881B1 KR1020150186585A KR20150186585A KR101675881B1 KR 101675881 B1 KR101675881 B1 KR 101675881B1 KR 1020150186585 A KR1020150186585 A KR 1020150186585A KR 20150186585 A KR20150186585 A KR 20150186585A KR 101675881 B1 KR101675881 B1 KR 101675881B1
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- Prior art keywords
- mortar
- rust
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- concrete structure
- reinforced concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/22—Apparatus or processes for treating or working the shaped or preshaped articles for cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2676—Polystyrenes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/002—Ground foundation measures for protecting the soil or subsoil water, e.g. preventing or counteracting oil pollution
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Paleontology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Hydrology & Water Resources (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The present invention relates to a method of manufacturing a reinforced concrete structure, the method comprising: cutting a portion of a reinforced concrete structure to expose embedded reinforcing bars to form a cutting portion; Removing the deteriorated concrete at a cutting portion of the reinforced concrete structure and removing rust of the exposed reinforcing bar; Removing the deteriorated surface of the deteriorated concrete and the rust removal surface of the exposed reinforcing bar with high pressure water; A rust-preventive treatment step of uniformly applying a rust-preventive mortar to a cutting portion of the reinforced concrete structure from which the foreign matter is removed to a predetermined thickness; A filling step of uniformly applying filler mortar containing anhydrous mixed powder, foamable polyurethane raw material, styrene butadiene rubber (SBR) latex, and water to a coating surface of the rust-preventive mortar to a predetermined thickness to restore a cross-section; And a surface finishing agent applying step of applying a surface finishing agent to the surface of the cross section filled with the filling mortar, thereby increasing adhesion with the mortar and concrete to improve the workability while maintaining high strength, The present invention relates to a method of repairing and reinforcing a section of a deteriorated portion of a reinforced concrete structure capable of improving the durability of a concrete structure.
Description
The present invention relates to a method of manufacturing a reinforced concrete structure, the method comprising: cutting a portion of a reinforced concrete structure to expose embedded reinforcing bars to form a cutting portion; Removing the deteriorated concrete at a cutting portion of the reinforced concrete structure and removing rust of the exposed reinforcing bar; Removing the deteriorated surface of the deteriorated concrete and the rust removal surface of the exposed reinforcing bar with high pressure water; A rust-preventive treatment step of uniformly applying a rust-preventive mortar to a cutting portion of the reinforced concrete structure from which the foreign matter is removed to a predetermined thickness; A filling step of uniformly applying filler mortar containing anhydrous mixed powder, foamable polyurethane raw material, styrene butadiene rubber (SBR) latex, and water to a coating surface of the rust-preventive mortar to a predetermined thickness to restore a cross-section; And a surface finishing agent applying step of applying a surface finishing agent to the surface of the cross section filled with the filling mortar and finishing the surface finishing agent, and a method for repairing and reinforcing the section of the deteriorated part of the reinforced concrete structure.
Generally, various mortar and concrete structures constructed for civil engineering construction are deteriorated by chemical action of weather change, seawater, groundwater, rainwater, various polluted water and pollution materials and local peeling, peeling, crack, corrosion The damage is generated. Particularly, concrete structures such as waterway boxes, agricultural waterways, etc. are likely to be cracked and deteriorated due to penetration of water or chemicals. If mortar and concrete are degraded due to deterioration, weakness of tensile strength, brittle behavior, and corrosion of reinforcing steel become severe, mortar and concrete structure may collapse, so that if cracks occur in concrete structure, It was necessary to repair the site.
In order to solve the above-mentioned problems, research and development on a single-sided repair mortar have been vigorously carried out. However, in the prior art related to the conventional single-sided repair mortar, in the case of the registered patent (10-2005-0012272) 10-2003-0023873), and antibacterial properties in the case of registered patent (10-2004- 0034527).
However, considering the fact that the deterioration of concrete is not related to any one of the causes, but because the various causes are related to each other in a complex manner, it is urgent to develop technologies and products capable of analyzing and coping with the causes as a whole.
An embodiment of the present invention is to provide a reinforced concrete structure which is capable of providing a reinforced concrete structure with high strength and durability by removing deteriorated portions of concrete structures due to corrosion of reinforcing bars, And to provide a section repair and reinforcement method.
One embodiment of the present invention includes a step of cutting a portion of a reinforced concrete structure to expose embedded reinforcing bars to form a cutting portion; Removing the deteriorated concrete at a cutting portion of the reinforced concrete structure and removing rust of the exposed reinforcing bar; Removing the deteriorated surface of the deteriorated concrete and the rust removal surface of the exposed reinforcing bar with high pressure water; A rust-preventive mortar containing cement, aggregate, urethane emulsion resin, aziridine compound, styrene-butadiene rubber (SBR) latex, modified silicone additive and water is uniformly applied to a cutting part of the reinforced concrete structure from which the foreign substance is removed An anticorrosion treatment step; A mortar containing a mixture of a cement, a dry aggregate, a water-dispersible powder resin and an admixture powder, a foamable polyurethane raw material, a styrene butadiene rubber (SBR) latex, and water is applied to the surface of the rust- A filling step of uniformly applying the coating to a thickness to restore the cross section; And a surface finishing agent including cement, aggregate, urethane emulsion resin, aziridine compound, styrene butadiene rubber (SBR) latex, modified silicone additive, compatibilizing agent and water is applied to the surface of the cross section filled with the filling mortar The present invention also provides a method for repairing and reinforcing a section of a deteriorated portion of a reinforced concrete structure including a surface finishing agent applying step.
Wherein said rust-inhibitive mortar comprises 27 to 33 wt% of cement, 30 to 40 wt% of aggregate, 13 to 17 wt% of urethane emulsion resin, 1 to 5 wt% of aziridine compound, 3 to 15 wt% of styrene butadiene rubber (SBR) 0.5 to 3% by weight of a modified silicone additive and 12 to 17% by weight of water.
In addition, the filling mortar may include a waterless mixed powder including a cement, a dried aggregate, a water dispersible powder resin, an admixture powder, a foamable polyurethane raw material, a styrene butadiene rubber (SBR) latex, and water.
In the filling step, a mixed powder of anhydrous cement, dried aggregate, water-dispersible powder resin, and admixture powder is added to the surface of the rust-inhibitive mortar; Introducing a foamable polyurethane feedstock; Introducing styrene-butadiene rubber (SBR) latex and water, and covering the cover to foam and expand the foamable polyurethane raw material; And curing the foamed polyurethane.
The surface finish may also comprise 23 to 27 wt% of cement, 28 to 32 wt% of aggregate, 7 to 9 wt% of urethane emulsion resin, 1 to 5 wt% of aziridine compound, 6 to 8 wt% of styrene butadiene rubber (SBR) %, 0.1 to 4% by weight of modified silicone additive, 1 to 5% by weight of compatibilizer and 15 to 25% by weight of water.
According to one embodiment of the present invention, in the method of repairing and reinforcing a section of a deteriorated portion of a reinforced concrete structure, a foamed polyurethane foam is foamed, and an anhydrous mixed powder and a styrene butadiene rubber (SBR) latex are integrally combined, So that the adhesive force between the mortar and the concrete is increased, thereby maintaining high strength and improving the workability. In addition, it is possible to improve the durability of reinforced concrete structures by suppressing micro cracks, increasing the watertightness of mortar and concrete, and suppressing the occurrence of additional cracks due to deterioration of freezing due to penetration of air, There is an effect.
Hereinafter, embodiments of the present invention will be described in detail. However, it should be understood that the present invention is not limited thereto, and the present invention is only defined by the scope of the following claims.
One embodiment of the present invention includes a step of cutting a portion of a reinforced concrete structure to expose embedded reinforcing bars to form a cutting portion; Removing the deteriorated concrete at a cutting portion of the reinforced concrete structure and removing rust of the exposed reinforcing bar; Removing the deteriorated surface of the deteriorated concrete and the rust removal surface of the exposed reinforcing bar with high pressure water; A rust-preventive mortar containing cement, aggregate, urethane emulsion resin, aziridine compound, styrene-butadiene rubber (SBR) latex, modified silicone additive and water is uniformly applied to a cutting part of the reinforced concrete structure from which the foreign substance is removed An anticorrosion treatment step; A mortar containing a mixture of a cement, a dry aggregate, a water-dispersible powder resin and an admixture powder, a foamable polyurethane raw material, a styrene butadiene rubber (SBR) latex, and water is applied to the surface of the rust- A filling step of uniformly applying the coating to a thickness to restore the cross section; And a surface finishing agent including cement, aggregate, urethane emulsion resin, aziridine compound, styrene butadiene rubber (SBR) latex, modified silicone additive, compatibilizing agent and water is applied to the surface of the cross section filled with the filling mortar The present invention also provides a method for repairing and reinforcing a section of a deteriorated portion of a reinforced concrete structure including a surface finishing agent applying step.
The rust of the reinforcing bar is removed in the step of removing the deteriorated concrete and the rust removing surface of the exposed reinforcing bar by the high pressure water, and then the aqueous solution of the nitrate is applied to the reinforcing bars. Such a nitrate serves as a rust inhibitor for reinforcing bars. By embedding rust-preventive mortar after applying this aqueous solution, the progress of subsequent corrosion can be effectively suppressed.
Wherein said rust-inhibitive mortar comprises 27 to 33 wt% of cement, 30 to 40 wt% of aggregate, 13 to 17 wt% of urethane emulsion resin, 1 to 5 wt% of aziridine compound, 3 to 15 wt% of styrene butadiene rubber (SBR) 0.5 to 3% by weight of a modified silicone additive and 12 to 17% by weight of water.
The cement of the rust-preventive mortar may be ordinary portland cement as the main binder for the strength development of the rust-preventive mortar. Also, the Portland cement may be prepared by mixing at least one material selected from the group consisting of alumina cement, calcium sulphoaluminate (CSA) cement and mixed cement thereof to improve the durability by imparting acid resistance and shrinkage compensation effect There is an effect that can be. In this case, the alumina cement, calcium sulfate aluminate (CSA) cement, and mixed cement thereof may be used in an amount of 30 to 50 parts by weight based on 100 parts by weight of the Portland cement.
The aggregate of the rust-preventive mortar is generally used in the art, and its kind is not particularly limited, but is selected from the group consisting of silica sand, blast furnace slag, fly ash, silica fume, fine limestone powder, One or more species can be used.
The urethane emulsion resin of the rust-inhibitive mortar may be used as a non-toxic water-dispersible resin and mixed with the silicon-modified acrylic emulsion resin at a volume ratio of 1: 1.
The aziridine compound of the rust-preventive mortar is used for curing the urethane emulsion resin. As the aziridine compound, aziridine functional group participates in the curing reaction, so that it is preferable to use a compound suitable as a crosslinker. Any of the aziridine compounds may be used. In the present invention, CX-100, a product of NeoResin, was used as a polyfunctional aziridine liquid crosslinker.
The modified silicone additive of the anti-corrosive mortar has the effect of improving the water repellency and oil repellency, reducing the adhesion of contaminants, and maximizing the anti-corrosive effect. Such modified silicone additive may be at least one selected from the group consisting of modified fluorine alkylsilane, modified silane polymer acryl, modified amino silane, and mixtures thereof. Particularly, by using the modified fluorine alkylsilane, it is possible not only to maximize the rust prevention effect, but also to increase the adhesion with mortar and concrete.
The filler mortar may include a mixed powder of anhydrous materials including a cement, a dry aggregate, a water dispersible powder resin, an admixture powder, a foamable polyurethane raw material, a styrene butadiene rubber (SBR) latex, and water.
Wherein the anhydrous mixed powder comprises 80 to 150 parts by weight of a dried aggregate, 1 to 20 parts by weight of a water-dispersible powder resin, and 1 to 10 parts by weight of an admixture powder, based on 100 parts by weight of cement, It can be easily reinforced. The anhydrous mixed powder has a particle size generally used in the art, and its size is not particularly limited. Particularly, it is preferable to use the water-dispersible powder resin having an average particle diameter in the range of 50 to 300 mu m. The dried aggregate preferably has a length ranging from 3 to 6 mm.
Wherein the filling step comprises the steps of: a) adding a dry powder mixture containing cement, dry aggregate, water-dispersible powder resin, and admixture powder to a surface of the rust-preventive mortar; Introducing a foamable polyurethane feedstock; Introducing styrene-butadiene rubber (SBR) latex and water, and covering the cover to foam and expand the foamable polyurethane raw material; And curing the foamed polyurethane. As a result, hydration is caused by the inclusion of anhydrous mixed powder in the polyurethane foam layer, and polyurethane is foamed, so that anhydrous mixed powder and styrene-butadiene rubber (SBR) latex are integrally combined and cured, There is an effect that can be combined.
The cement of the mortar for filling is generally used in the art, and the kind thereof is not particularly limited.
The dry aggregate of the mortar for filling is generally used in the art, and the kind thereof is not particularly limited. For example, the dry aggregate of the filler mortar may be selected from the group consisting of silica sand, blast furnace slag, fly ash, silica fume, fine limestone powder, At least one selected may be used. Particularly, it is preferable to use mixed aggregate of silica sand and blast furnace slag.
The water dispersible powder resin of the filling mortar is excellent in adhesiveness for integration with a concrete structure, prevention of penetration of water and harmful substances by pore filling, mechanical properties to resist shrinkage and low sensitivity, abrasion resistance, bending and impact, (Ethylene vinyl acetate), styrene butadiene rubber (SBR), and acryl-based materials.
The admixture powder of the mortar for filling may be used as a retarding agent, an accelerator, a thickener, a defoaming agent and other mineral admixtures, and is commonly known in connection with workability at the time of construction such as control of pot life, proper viscosity, reduction of air volume, Can be used.
The foamable polyurethane raw material of the filling mortar may be composed of a foaming agent, a catalyst, a foam stabilizer, a crosslinking agent, a functional additive (a flame retardant, an antibacterial agent, an antistatic agent, a deodorant, a pigment, etc.) based on polyol and isocyanate.
As the polyol of the foamable polyurethane raw material, polyether-based polypropylene glycol (PPG), polyethylene glycol (PEG), trimethylolpropane (TMP), glycerin and polytetramethylene glycol (PTMG) As the polyester type, propylene glycol (PG) type, ethylene glycol (EG) type, diethylene glycol (DEG) type and the like can be used.
Examples of the isocyanate of the foamable polyurethane raw material include toluene diisocyanate (TDI), methylene diphenyl diisocyanate (MDI), isophorone diisocyanate (IPDI), and hexamethylene diisocyanate (HDI).
Examples of the foaming agent for the foamable polyurethane raw material include carbon dioxide (generated by reaction with water and isocyanate), freon, methylene chloride, pentane, and the like.
As the catalyst for the foamable polyurethane raw material, a tertiary amine catalyst and an organometallic catalyst (tin compound, lead compound, etc.) are generally used in large amounts.
The foaming agent of the foamable polyurethane raw material is a kind of additive which acts on the cell structure in the foam due to the effect of the surfactant effect and controls the mixing property of the raw material, stability, bubble generation, stability of the bubble, Surfactants such as siloxanes may be used.
As the crosslinking agent for the foamable polyurethane raw material, an alcohol or an amine having three or more valences is mainly used.
The surface finish comprises 23 to 27 wt% cement, 28 to 32 wt% aggregate, 7 to 9 wt% urethane emulsion resin, 1 to 5 wt% aziridine compound, 6 to 8 wt% styrene butadiene rubber (SBR) latex, From 0.1 to 4% by weight of a modified silicone additive, from 1 to 5% by weight of a compatibilizer, and from 15 to 25% by weight of water.
The cement of the surface finishing agent may be ordinary Portland cement as a main binder for the strength development of the surface finishing agent. Also, the Portland cement may be prepared by mixing at least one material selected from the group consisting of alumina cement, calcium sulphoaluminate (CSA) cement and mixed cement thereof to improve the durability by imparting acid resistance and shrinkage compensation effect There is an effect that can be. In this case, the alumina cement, calcium sulfate aluminate (CSA) cement, and mixed cement thereof may be used in an amount of 30 to 50 parts by weight based on 100 parts by weight of the Portland cement.
The aggregate of the surface finishing agent is generally used in the art and is not particularly limited. For example, the aggregate of the surface finishing agent is selected from the group consisting of silica sand, a blast furnace slag, fly ash, silica fume, limestone fine powder, metakaolin, May be used. In particular, by using a mixed aggregate comprising 20 to 50 parts by weight of at least one member selected from the group consisting of blast furnace slag, silica fume, metakaolin and mixed powders thereof with respect to 100 parts by weight of silica sand, The aggregate is incorporated into the microvoids of the mortar, thereby enhancing the compactness of the mortar, thereby improving the primary strength and lowering the chloride ion penetration resistance.
The urethane emulsion resin of the surface finishing agent may be used as a non-toxic water-dispersible resin and mixed with the silicon-modified acrylic emulsion resin at a volume ratio of 1: 1.
The aziridine compound of the surface finishing agent is used for curing the urethane emulsion resin. As the aziridine compound, it is preferable to use a compound suitable as a crosslinker because the aziridine functional group participates in the curing reaction. Any of the aziridine compounds may be used. In the present invention, CX-100, a product of NeoResin, was used as a polyfunctional aziridine liquid crosslinker.
The modified silicone additive of the surface finishing agent may be at least one selected from the group consisting of modified fluorine alkylsilane, modified silane polymer acryl, modified amino silane, and mixtures thereof. Particularly, it is preferable that a modified denatured silane polymer comprising 40 to 60 parts by weight of at least one member selected from the group consisting of a modified silane polymer, an amino silane, and a mixture thereof, based on 100 parts by weight of the modified fluorine alkylsilane By using a silicone additive, it is possible to prevent the contaminants from adhering to and penetrating the concrete surface, and to increase adhesion with the mortar and concrete.
The compatibilizing agent of the surface finishing agent can be expected to have a satisfactory effect on workability and mechanical strength by using maleic anhydride grafted polypropylene (hereinafter referred to as MAPP).
According to one embodiment of the present invention, in the method of repairing and reinforcing a section of a deteriorated portion of a reinforced concrete structure, a foamed polyurethane foam is foamed, and an anhydrous mixed powder and a styrene butadiene rubber (SBR) latex are integrally combined, So that the adhesive force between the mortar and the concrete is increased, thereby maintaining high strength and improving the workability. In addition, it is possible to improve the durability of reinforced concrete structures by suppressing micro cracks, increasing the watertightness of mortar and concrete, and suppressing the occurrence of additional cracks due to deterioration of freezing due to penetration of air, There is an effect.
Claims (5)
Removing the deteriorated concrete at a cutting portion of the reinforced concrete structure and removing rust of the exposed reinforcing bar;
Removing the deteriorated surface of the deteriorated concrete and the rust removal surface of the exposed reinforcing bar with high pressure water;
A rust-preventive mortar containing cement, aggregate, urethane emulsion resin, aziridine compound, styrene-butadiene rubber (SBR) latex, modified silicone additive and water is uniformly applied to a cutting portion of the reinforced concrete structure from which the foreign matter has been removed An anticorrosion treatment step;
A mortar containing a mixture of a cement, a dry aggregate, a water-dispersible powder resin and an admixture powder, a foamable polyurethane raw material, a styrene butadiene rubber (SBR) latex, and water is applied to the surface of the rust- A filling step of uniformly applying the coating to a thickness to restore the cross section; And
A surface finishing agent containing cement, aggregate, urethane emulsion resin, aziridine compound, styrene butadiene rubber (SBR) latex, modified silicone additive, compatibilizing agent and water is applied to the surface of the cross section filled with the filling mortar to finish And a surface finishing agent application step,
Wherein the filling step comprises the steps of: a) adding a dry powder mixture containing cement, dry aggregate, water-dispersible powder resin, and admixture powder to a surface of the rust-preventive mortar;
Introducing a foamable polyurethane feedstock;
Introducing styrene-butadiene rubber (SBR) latex and water, and covering the cover to foam and expand the foamable polyurethane raw material; And
A method for repairing and reinforcing a section of a deteriorated portion of a reinforced concrete structure, comprising the step of curing foamed polyurethane, wherein the section is restored by uniformly applying filler mortar to the surface of the rustproofing mortar to a predetermined thickness.
Wherein said rust-inhibitive mortar comprises 27 to 33 wt% of cement, 30 to 40 wt% of aggregate, 13 to 17 wt% of urethane emulsion resin, 1 to 5 wt% of aziridine compound, 3 to 15 wt% of styrene butadiene rubber (SBR) 0.5 to 3 wt% of a modified silicone additive and 12 to 17 wt% of water.
The surface finish comprises 23 to 27 wt% cement, 28 to 32 wt% aggregate, 7 to 9 wt% urethane emulsion resin, 1 to 5 wt% aziridine compound, 6 to 8 wt% styrene butadiene rubber (SBR) latex, 0.1 to 4 wt% of a modified silicone additive, 1 to 5 wt% of a compatibilizer, and 15 to 25 wt% of water.
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| KR1020150186585A KR101675881B1 (en) | 2015-12-24 | 2015-12-24 | Method for reinforcing the degradation part of concrete structures |
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| KR1020150186585A KR101675881B1 (en) | 2015-12-24 | 2015-12-24 | Method for reinforcing the degradation part of concrete structures |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102059571B1 (en) * | 2017-11-07 | 2019-12-26 | (주)한양이엔씨 | Method for repair of steel corrosion by using corrosion inhibition surface coating composition and organic corrosion inhibitor having corrosion performance and fixing chlorine ion |
| CN112497453A (en) * | 2019-09-16 | 2021-03-16 | 中国京冶工程技术有限公司 | Non-corrosive liquid heat-conducting medium for cement electric heating composite template and heat preservation control device |
| CN112645658A (en) * | 2020-12-29 | 2021-04-13 | 南通友力混凝土有限公司 | High-strength recycled concrete and production process thereof |
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