KR101653972B1 - Repair Mortar Composition Comprising Hybrid Fiber and Repairing Method Using the Same - Google Patents
Repair Mortar Composition Comprising Hybrid Fiber and Repairing Method Using the Same Download PDFInfo
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- KR101653972B1 KR101653972B1 KR1020160048156A KR20160048156A KR101653972B1 KR 101653972 B1 KR101653972 B1 KR 101653972B1 KR 1020160048156 A KR1020160048156 A KR 1020160048156A KR 20160048156 A KR20160048156 A KR 20160048156A KR 101653972 B1 KR101653972 B1 KR 101653972B1
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/386—Carbon
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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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/02—Cellulosic materials
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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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/12—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone characterised by the shape, e.g. perforated strips
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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
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/283—Polyesters
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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
- C04B24/38—Polysaccharides or derivatives thereof
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/44—Thickening, gelling or viscosity increasing agents
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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
- C04B2111/72—Repairing or restoring existing buildings or building materials
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Nanotechnology (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
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Abstract
Description
The present invention relates to a repair mortar composition including a hybrid fiber and a repair method using the same, and more particularly, to a mortar composition for repairing concrete structures, which comprises a hybrid fiber in which carbon fibers and natural fibers are mixed, The present invention relates to a repair mortar composition including a hybrid fiber capable of effectively repairing and reinforcing a deteriorated portion of a concrete structure and a repair method using the same.
In the case of concrete structures such as buildings, bridges, and tunnels, many microcracks occur during the initial curing process due to the characteristics of concrete, and cracks, corrosion, corrosion, Peeling phenomenon is often generated, and concrete deteriorates due to the time elapsed due to the external atmosphere condition or environmental influences, resulting in various performance deterioration factors.
In order to prevent the damage caused by the performance deterioration factors of such concrete structures and to improve the life of the concrete structures, it is required to carry out repair work which can restore the original performance and shape from the cracks, corrosion and deteriorated portions of the concrete. Repair mortar is used to repair the section of the structure.
As a conventional technique disclosed in relation to the above concrete structure repair mortar, cement mortar comprising cement, blast furnace slag powder, fine blast furnace slag fine aggregate, and tackifier; An acidic substance comprising an aluminum sulfate aqueous solution or an acrylic acid ester copolymer emulsion; 1 to 9 parts by weight of a chloride ion adsorbent composed of a calcium aluminum complex hydroxide or a calcium aluminum complex hydroxide containing an acetic acid ion between layers is added to 100 parts by weight of the cement and 0.5 to 100 parts by weight of a cement based expanding agent and 20 to 500 0.1 to 50 parts by weight in terms of solid content of the resin, 0.05 to 5 parts by weight of any one of organic fibers and inorganic fibers; 25 to 35 parts by weight of blast furnace slag powder, 25 to 35 parts by weight of cement and 30 to 50 parts by weight of blast furnace slag fine aggregate; And a proliferating material composed of at least one kind selected from the group consisting of fine silica having a particle size of 30 to 500 탆, water glass and magnesium fluoride or magnesia and silica. Therefore, it is possible to prevent maintenance and deterioration and prolong the life There is known a cement mortar composition for preventing the neutralization of concrete structures and the prevention of salt corrosion.
However, in the case of the above-mentioned conventional mortar composition, durability is considered by applying various aggregates together with cement. However, since only one fiber of organic fiber or inorganic fiber is selectively applied, There is a problem that the weight of the composition is increased and maintenance work is difficult, and when the organic fiber alone is applied, the durability of the structure is poor.
Also, conventionally, in the process of producing a mortar composition, since chloride ions penetrate into the mortar itself to generate a large number of bubbles, there is a problem that the quality due to the repair work of the concrete structure is lowered and the durability is lowered.
Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a hybrid fiber comprising a mixture of cement and silica, an expandable material, a VAE powder resin, an admixture and a thickener, And to provide a repair mortar composition including hybrid fibers capable of enhancing maintenance durability while preventing pore generation at a repair work site and improving repair work quality.
In addition, since the present invention is configured to repair the concrete structure by applying a primer and a surface protective agent to the site to be applied before and after the repair mortar composition, it is possible to repair the hybrid fiber to improve the durability of various types of structures The present invention provides a repair method using a repair mortar composition including a mortar composition.
The repair mortar composition including the hybrid fibers proposed by the present invention comprises hybrid fibers obtained by mixing cement and silica, an expansion agent, a VAE powder resin, an admixture and a thickener, and carbon fibers and natural fibers.
Wherein the VAE powder is used in an amount of 0.5 to 1.0 part by weight, the admixture is used in an amount of 1.6 to 1.7 parts by weight, the thickener is used in an amount of 0.03 to 0.05 part by weight, 0.07 to 0.09 part by weight of the hybrid fiber.
The silica sand is composed of 20 to 22 parts by weight of the particles 3 to 4 having a particle size of 1.2 to 2.4 mm and 33 to 34 parts by weight of the particles 5 to 6 having a particle size of 0.35 to 1.2 mm.
The thickener is constituted by mixing MEHEC thickener and starch / polysaccharide thickener in a ratio of 1: 3.
The hybrid fibers are composed of carbon fibers and natural fibers mixed at a ratio of 5: 5.
The hybrid fibers are constructed such that the lengths of the carbon fibers and the natural fibers are 0.3 to 3.0 mm, respectively.
The repair method using the repair mortar composition including the hybrid fiber proposed by the present invention comprises (1) 40 to 43 parts by weight of cement, 53 to 55 parts by weight of silica sand, 2.0 to 2.1 parts by weight of expanding agent, 0.5 to 1.0 part by weight of VAE powder resin 1.6 to 1.7 parts by weight of an admixture, 0.03 to 0.05 part by weight of a thickener, and 0.07 to 0.09 part by weight of a hybrid fiber to prepare a maintenance mortar composition; (2) crushing and chipping and subjecting the deteriorated work site of the concrete structure to pretreatment; (3) applying an adhesion strengthening primer to the site to be applied of the concrete structure; (4) charging the repair mortar composition prepared in the step (1) to a site to be treated of the concrete structure so as to repair the section; (5) applying a neutralizing surface-protective agent to the repairing site of the concrete structure.
And washing the concrete structure with high pressure so as to remove dust and foreign matter on the surface of the work site before applying the adhesive-strengthening primer in the step (3).
Further, in step (3), water is sprayed to saturate the inside of the concrete structure before applying the adhesive-strengthening primer, and drying the surface of the concrete structure part of the concrete structure.
In the step (3), at least one selected from the group consisting of an acrylic resin, a polyacrylic ester resin, an ethylvinyl acetate resin, a methyl methacrylate resin and a silane compound is used as the adhesion enhancing primer.
In the step (5), at least one selected from the group consisting of an acrylic resin, a polyacrylic ester resin, an ethylvinyl acetate resin, a methyl methacrylate resin, a silicone resin and a silane compound is used as the neutralization surface protecting agent.
According to the repair mortar composition including the hybrid fiber according to the present invention and the repair method using the same, since the repair mortar including the VAE powder resin, the thickener and the hybrid fiber is formed in the cement and silica sand, the excellent properties of the repair mortar product are improved, To improve the workability of the construction by adjusting the weight and viscosity of the mortar and to improve the quality of the work by eliminating the factors that cause voids during the repair mortar construction and at the same time, The effect of improving the durability as well as the performance is obtained.
In addition, according to the repair mortar composition including the hybrid fiber according to the present invention and the repair method using the same, since the adhesive reinforced primer and the neutralization surface protecting agent are used in the repairing process, the flexible construction is applied to various types of concrete structures, It is possible to achieve a high reinforcing effect and to apply a good adhesion force with the concrete structure, thereby ensuring reliable maintenance and reinforcement efficiency.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing one embodiment of a repair method using a repair mortar composition including hybrid fibers according to the present invention. FIG.
The present invention is a technical feature of a maintenance mortar composition including hybrid fibers comprising cement and silica, an expandable material, a VAE powder resin, an admixture and a thickener, and hybrid fibers obtained by mixing carbon fibers and natural fibers.
Wherein the VAE powder is used in an amount of 0.5 to 1.0 part by weight, the admixture is used in an amount of 1.6 to 1.7 parts by weight, the thickener is used in an amount of 0.03 to 0.05 part by weight, , And 0.07 to 0.09 part by weight of the hybrid fiber, is made into a technical feature of the repair mortar composition including the hybrid fiber.
The present invention also provides a method for producing a VAE powder, which comprises (1) 40 to 43 parts by weight of cement, 53 to 55 parts by weight of silica sand, 2.0 to 2.1 parts by weight of an expanding agent, 0.5 to 1.0 part by weight of VAE powder resin, 1.6 to 1.7 parts by weight of an admixture, 0.07 to 0.09 part by weight of a hybrid fiber to prepare a maintenance mortar composition; (2) crushing and chipping and subjecting the deteriorated work site of the concrete structure to pretreatment; (3) applying an adhesion strengthening primer to the site to be applied of the concrete structure; (4) charging the repair mortar composition prepared in the step (1) to a site to be treated of the concrete structure so as to repair the section; (5) applying a neutralizing surface protective agent to the repair and construction site of the concrete structure, and a repair method using the repair mortar composition including the hybrid fiber.
Next, the repair mortar composition including the hybrid fiber according to the present invention will be described in detail.
However, the embodiments of the present invention can be modified into various forms, and the scope of the present invention is not construed as being limited to the embodiments described below. The embodiments of the present invention are provided so that those skilled in the art can understand the present invention.
First, the repair mortar composition including the hybrid fiber according to the present invention comprises cement and silica, an expansion agent, a VAE powder resin, an admixture and a thickener, and a hybrid fiber.
40 to 43 parts by weight of the cement, 53 to 55 parts by weight of the silica sand, 2.0 to 2.1 parts by weight of the expanding material, 0.5 to 1.0 part by weight of the VAE powder resin, 1.6 to 1.7 parts by weight of the admixture, 0.03 to 0.05 part by weight of the thickener, 0.07 to 0.09 parts by weight of the hybrid fibers.
Since the cement is used as a repair mortar, cement having excellent long-term strength rather than initial strength is used. For example, one of Portland cement, blast furnace slag cement, silica cement, and fly ash cement is used.
In the above, the cement is usually constructed using portland cement as a basic constitution, but it is also possible to use white portland cement using white limestone depending on the type of the concrete structure.
The silica sand is formed by mixing two or more types of silica sand having different particle sizes. That is, the silica sand is composed of a mixture of a No. 3 yarn having a general particle diameter of 1.5 to 2.4 mm or a No. 4 yarn having a particle diameter of 0.7 to 1.2 mm or a No. 6 yarn having a particle diameter of 0.35 to 0.7 mm in a No. 4 yarn having a particle diameter of 1.2 to 1.5 mm. So that more detailed physical characteristics can be achieved.
The silica sand is applied so as to blend 53 to 55 parts by weight with respect to 100 parts by weight of the total amount of the repair mortar composition, 20 to 22 parts by weight of the No. 3 to No. 4 silica having a particle size of 1.2 to 2.4 mm, 6, 33 to 34 parts by weight.
The expander is provided for the purpose of improving the crack resistance and the watertightness in the repair mortar and imparts the expansion performance without adversely affecting the physical properties of the mortar itself and is applied by applying a general CSA expansion agent such as calcium sulfoaluminate It is possible to do.
The VAE powder resin plays a role of enhancing the adhesion strength in the repair mortar.
In general, the VAE powder resin is a re-forming polymer composed mainly of vinyl acetate-ethylene, and is a copolymer powder resin composed of two kinds of monomers. It is known that it has excellent adhesion to water and saponification resistance against non-polar materials And has the property that a permanently flexible polymer film can be produced.
It is preferable that the VAE powder resin is formulated such that 0.5 to 1.0 part by weight of the VAE powder resin is blended with 100 parts by weight of the total amount of the repair mortar composition. That is, when the VAE powder resin is used in an amount of not less than 1.0 part by weight, the composition is difficult to mix due to a high polymer content. When the VAE powder resin is used in an amount of not more than 0.5 parts by weight, It becomes difficult.
As the admixture, silica fume is used as a by-product of silicon and formed of ultrafine particles having a particle size of 0.1 to 0.5 占 퐉. Therefore, it is preferable to fill the gap between the particles of the repair mortar so as to obtain high strength and high durability.
As the thickener, two types of thickeners, MEHEC thickener and starch / polysaccharide thickener, are used.
The MEHEC thickener enhances the viscosity of the mortar to remove bleeding of the water.
Generally, in the case of MEHEC thickener, a water-soluble polymer such as a cellulose derivative (MEHEC) is used as a thickening agent. The cellulose molecule is composed of anhydrous glucoside monomer chain, and the number of monomers plays a very important role in viscosity.
The starch / polysaccharide thickener is extracted from plants (potato, corn, tapioca, etc.) and can impart functional properties such as thickening effect, prevention of sagging and prevention of separation of materials.
Wherein the thickener is constituted by mixing the MEHEC thickener and the starch / polysaccharide thickener, wherein the MEHEC thickener and the starch / polysaccharide thickener are mixed in a weight ratio of 1: 3. For example, 0.03 to 0.05 part by weight of the thickener is added to 100 parts by weight of the repair mortar, and 0.01 part by weight of the MEHEC thickener is mixed with 0.03 part by weight of the starch / polysaccharide thickener, It is possible to secure the thickness of the maintenance part by preventing the phenomenon of rearward sagging.
The hybrid fibers are formed by mixing carbon fibers and natural fibers in a weight ratio of 5: 5.
The carbon fiber is a fiber reinforced with a synthetic polymer. The carbon fiber is excellent in heat resistance and impact resistance, and has a strong resistance to chemicals. However, it is expensive, has a disadvantage in that it is difficult to manufacture and heavy in construction.
In addition, natural fibers are cellulose fibers using cotton, flax, ramie, hemp, etc., which have higher strength than other fibers, have excellent stability to chemical agents, are economical and have no byproducts after disposal, And the impact resistance is low.
It is preferable that the hybrid fibers have a length of 0.3 to 3.0 mm for all fibers, that is, carbon fibers and natural fibers.
If the length of the carbon fiber and the natural fiber is 0.3 mm or less, the tensile performance due to the fiber is not affected. If the length of the carbon fiber and the natural fiber is 3.0 mm or more, .
Next, a repair method using the repair mortar composition including the hybrid fiber according to the present invention will be described.
(1) repair mortar manufacturing step, (2) concrete structure pretreatment step, (3) pre-treatment mortar composition preparation step, and An adhesion enhancing primer application step, (4) a maintenance mortar composition application step, and (5) a neutralization surface protective agent application step.
(1) Repair mortar manufacturing step
40 to 43 parts by weight of cement, 53 to 55 parts by weight of silica sand, 2.0 to 2.1 parts by weight of an expanding agent, 0.5 to 1.0 part by weight of a VAE powder resin, 1.6 to 1.7 parts by weight of an admixture, 0.03 to 0.05 part by weight of a thickener, Were mixed uniformly to prepare a maintenance mortar composition.
(2) Pre-treatment step of concrete structure
Using a tool (eg, grinder, breaker, waterjet, etc.) for pretreatment of the concrete structure, the concrete structure is crushed and chipped to remove the deteriorated work site.
(3) Adhesion-strengthening primer application step
The adhesive strengthening primer is applied to the site of the concrete structure pretreated in the step (2) by using a brush, roller, or spray.
In this case, before applying the adhesive-strengthening primer in step (3), high pressure is cleaned using air or water to remove dust and foreign matter on the surface of the concrete structure of the concrete structure, Make the surface.
In step (3), water is sprayed to saturate the inside of the concrete structure before applying the adhesive-strengthening primer, and only the surface of the part to be applied of the high-pressure washed concrete structure is dried.
In the step (3), the adhesion-enhancing primer is formed using at least one selected from the group consisting of an acrylic resin, a polyacrylic ester resin, an ethylvinyl acetate resin, a methyl methacrylate resin, and a silane compound.
(4) Repair Mortar Composition Construction Step
The repair mortar composition prepared in the step (1) is filled in a concrete or shotcrete manner to a site to be applied to a concrete structure to repair a section.
When the repair mortar composition is applied, the finish is finished by hand finishing.
(5) Neutralizing surface protecting agent application step
Apply neutralizing surface protection agent with excellent neutralization protection performance to the concrete construction repair area, but use brush, roller and spray.
In the step (5), the neutralization surface protecting agent is formed using at least one selected from the group consisting of acrylic resin, polyacrylic ester resin, ethylvinyl acetate resin, methyl methacrylate resin, silicone resin and silane compound.
Hereinafter, a repair mortar composition including the hybrid fibers according to the present invention was prepared and tested for its performance.
[Manufacturing Example]
The hybrid fibers of the present invention were prepared by mixing carbon fibers having a length of 0.3 to 3.0 mm and natural fibers at a weight ratio of 5: 5.
(MEHEC thickener) 0.01 part by weight, starch / polysaccharide (polyvinyl alcohol), 41.44 parts by weight of cement, 20.72 parts by weight of silica sand (No. 4), 33.15 parts by weight of silica sand (No. 6), 2.07 parts by weight of expanding material, 0.83 parts by weight of VAE powder resin, 0.03 part by weight of a rye-based thickener and 0.08 part by weight of a hybrid fiber prepared in the above Preparation Example were added to prepare a repair mortar composition containing hybrid fibers.
(6), 33.15 parts by weight of dilatant, 2.07 parts by weight of expanding agent, 0.33 part by weight of VAE powder, 1.66 parts by weight of admixture, 0.01 part by weight of MEHEC thickener, 0.1 part by weight of starch / 0.03 part by weight of a rye-based thickener and 0.08 part by weight of a hybrid fiber prepared in the above Preparation Example were added to prepare a repair mortar composition containing hybrid fibers.
[Performance evaluation of the repair mortar composition including the hybrid fibers according to Examples 1 and 2]
Tests were conducted in accordance with the polymer cement mortar test method for repairing concrete structures of KS F 4042 concrete using the repair mortar composition prepared in Examples 1 and 2, and the results are shown in Table 1 below.
As a result of performing the tests according to the contents of Table 1 and evaluating the performance, it was confirmed that all the test items in the case of Example 1 exhibited a value satisfying the quality standard and exhibited superior performance over the quality standard.
Also in the case of Example 2, although most of the test items exhibited superior performance over the quality standard, in Example 2, unlike Example 1, the blending ratio of the VAE powder resin was lower than the blending ratio of the VAE powder resin in the present invention It was confirmed that the composition was easily mixed according to the composition when the amount of addition was less than 0.5 part by weight, but the bonding strength was lower than the reference value of quality. In Example 1, the mixing work between the compositions was smooth, .
That is, according to the repair mortar composition including the hybrid fiber according to the present invention and the repair method using the same, the repair mortar including the VAE powder resin, the thickener and the hybrid fiber is formed in the cement and silica sand, It improves the workability by adjusting the light weight and viscosity of the composition while improving the physical properties and improving the quality of the work by eliminating factors that cause porosity when constructing the repair mortar by lowering the central composition cost and making economical mortar construction. It is possible to improve the tensile performance of the mortar and the durability at the same time.
Although the preferred embodiments of the repair mortar composition including the hybrid fiber and the repair method using the same according to the present invention have been described above, the present invention is not limited thereto, and various modifications may be made within the scope of the claims and the detailed description of the invention. And this is also within the scope of the present invention.
Claims (11)
40 to 43 parts by weight of the cement, 53 to 55 parts by weight of the silica sand, 2.0 to 2.1 parts by weight of the expanding agent, 0.5 to 1.0 part by weight of the VAE powder resin, 1.6 to 1.7 parts by weight of the admixture, 0.03 to 0.05 part by weight of the thickener, 0.07 to 0.09 part by weight of the hybrid fiber,
The silica sand was composed of 20 to 22 parts by weight of the third to fourth yarns having a particle size of 1.2 to 2.4 mm and 33 to 34 parts by weight of the fifth to sixth yarns having a particle size of 0.35 to 1.2 mm,
The thickener is composed of MEHEC thickener and starch / polysaccharide thickener in a weight ratio of 1: 3,
Wherein the hybrid fiber is a mixture of carbon fibers and natural fibers in a weight ratio of 5: 5, and carbon fibers and natural fibers have a length of 0.3 to 3.0 mm, respectively.
(2) crushing and chipping and subjecting the deteriorated work site of the concrete structure to pretreatment;
(3) applying an adhesion strengthening primer to the site to be applied of the concrete structure;
(4) charging the repair mortar composition prepared in the step (1) to a site to be treated of the concrete structure so as to repair the section;
(5) applying a neutralizing surface protective agent to a repairing site of the concrete structure,
In the step (3), at least one selected from the group consisting of an acrylic resin, a polyacrylic ester resin, an ethylvinyl acetate resin, a methyl methacrylate resin, and a silane compound is used as the adhesion enhancing primer,
In the step (5), at least one selected from the group consisting of an acrylic resin, a polyacrylic ester resin, an ethylvinyl acetate resin, a methyl methacrylate resin, a silicone resin and a silane compound is used as the neutralization surface- A repair method using a repair mortar composition including a hybrid fiber.
And a step of washing the concrete structure with a high pressure so as to remove dust and foreign matter on the surface of the site to be applied before applying the adhesive reinforced primer in the step (3). .
And a step of spraying water to saturate the inside of the concrete structure before the application of the adhesive strengthening primer in the step (3), and drying the surface of the concrete structure part of the concrete structure. Repair method using mortar composition.
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| KR20200041407A (en) * | 2018-10-11 | 2020-04-22 | (주)제이엔티아이엔씨 | Polymer mortar compositon for repairment |
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| KR102260021B1 (en) | 2020-04-14 | 2021-06-04 | 김은수 | Repair mortar composition including acrylic fiber and repair method using same |
| KR102318755B1 (en) * | 2020-10-08 | 2021-10-28 | 대상이앤씨(주) | Repair and reinforcement shotcrete composition containing VAE polymer and hemp fiber |
| KR102392986B1 (en) | 2021-09-15 | 2022-05-03 | 대한강관 주식회사 | Corrugated steel pipe coating layer repair material and corrugated steel pipe repaired using the same |
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| KR102234156B1 (en) | 2018-10-11 | 2021-04-01 | 한양대학교 에리카산학협력단 | Polymer mortar compositon for repairment |
| KR20200041407A (en) * | 2018-10-11 | 2020-04-22 | (주)제이엔티아이엔씨 | Polymer mortar compositon for repairment |
| CN110564306A (en) * | 2019-10-21 | 2019-12-13 | 苏州金螳螂建筑装饰股份有限公司 | High-strength stone bonding material and preparation method and application thereof |
| KR102260021B1 (en) | 2020-04-14 | 2021-06-04 | 김은수 | Repair mortar composition including acrylic fiber and repair method using same |
| CN111875322A (en) * | 2020-08-07 | 2020-11-03 | 江苏智信达建筑科技有限公司 | Multi-component concrete composite repair mortar |
| KR102318755B1 (en) * | 2020-10-08 | 2021-10-28 | 대상이앤씨(주) | Repair and reinforcement shotcrete composition containing VAE polymer and hemp fiber |
| KR102392986B1 (en) | 2021-09-15 | 2022-05-03 | 대한강관 주식회사 | Corrugated steel pipe coating layer repair material and corrugated steel pipe repaired using the same |
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