KR20180003941A - Inorganic Based Composition For Reinforcing To Concrete Surface - Google Patents

Abstract

The present invention relates to a concrete surface reinforced inorganic composition for the remodeling of a building and, more specifically, to a concrete surface reinforced inorganic composition for the remodeling of a building using colloidal silicic acid and ionized alkali metal elements provided to suppress and control alkali recovery of 10-12 pH to a neutralization zone progressing in cylindrical body concrete before the remodeling of an old building and subsequent neutralization. A desired embodiment of the present invention is mono-fluid type solution, capable of atomizing, spraying and painting as inorganic ion water mixed with water, including 5-8 parts by weight of colloidal silicate (SiO_(3-x)), 3-5 parts by weight of ionized sodium (Na^(1+)), 1-10 parts by weight of ionized lithium (Li^(1+)), 25-75 parts by weight of sparkling water (H_2CO_3: CO_2 concentration 4000-15000 ppm/L), and 45-50 parts by weight of water.

Description

Technical Field [0001] The present invention relates to a concrete surface reinforcing inorganic composition for remodeling a building,

The present invention relates to a concrete surface strengthening inorganic composition for remodeling a building, and more particularly, to a concrete surface reinforcing inorganic composition for remodeling a building, and more particularly, to a method for restraining alkali control of pH 10 to 12 and neutralization The present invention relates to a concrete surface strengthening inorganic composition for remodeling a building using colloidal silicic acid and an ionizing alkali metal element.

Concrete is a material that makes up modern structure, and it is widely used not only for buildings such as houses, buildings, apartments but also civil structures such as dams, bridges, airports, and breakwaters because of its excellent economic efficiency with excellent resistance to earthquake, chemical resistance and durability.

In the case of domestic construction, social infrastructure and infrastructure projects from the 1970s to 1980s have been focused on, and a large number of advanced structures have been in use for more than 40 to 50 years. Long - term concrete structures have been undergoing rebuilding since the 2000s due to cracking, neutralization, deterioration factor penetration, and the like, resulting in corrosion of reinforcing steel, detachment of concrete, deterioration and durability. However, reconstruction is difficult to negotiate between resident and tenant and architect, and it is difficult to proceed with business due to the economic burden of privately owned buildings. Therefore, it is possible to improve the function without the cost of negotiations and owners, and the necessity and demand for the remodeling of the building is rapidly expanding to increase the real estate value.

The remodeling market occupies 25% of the total construction market from the 2000s, centering on the non-housing market. In particular, demand for remodeling of office buildings, especially in the Seoul metropolitan area, has increased to 880 billion won in 2010. The number of existing structures (remodeling) can be reduced by more than 60% compared to the cost of new construction because the cost required for designing> foundation> frame> facility> built- However, the number of additional economic structures requires high recycling rates and low maintenance costs of existing building frames.

For the recycling of reinforced concrete (RC) building frames, cracks, peeling, peeling, peeling due to neutralization (turtle cracking), initial inherent chloride (marine etc.), flyer chloride (external penetration ion) After removing the chipped area, repair and reinforcement of the frame should be done.

Therefore, in order to increase the recycling rate of the frame before proceeding with the number of concrete frames, it is necessary to apply the remedial agent for the re-alkalization of the neutralized concrete frame and an inhibitor for further neutralization inhibition.

In general, water-tight finishing is performed with an impermeable organic coating material having airtightness such as epoxy, urethane, acrylic, SBR (styrene-butadiene rubber), polyester and the like as an anti-neutralization inhibitor. The method of inhibiting using an organic system is a method in which a watertight (airtight) film is applied to the surface of a concrete, and it is easy to construct, and an acidic substance such as CO ₂ , SO _x , NO _x , The water released from the inside to the outside is also blocked, and a high water vapor pressure is applied to the interface of the coating portion, and the surface of the concrete with weak surface bonding force due to neutralization is peeled off. In addition, the organic coating material, which is a different material from the sphere, has a different expansion rate depending on the temperature, and the adhesion of the coating material is lowered, but the neutralization suppression performance is gradually reduced. Exposed coatings are hydrolyzed by direct sunlight and decline in performance in the next two to three years. Due to the above-mentioned reasons, the structure is continuously neutralized to cause a long-term durability life, so that the organic neutralization inhibitor is limited.

Inorganic materials are mainly silicon, nitrite, cement, lime, etc. Inorganic materials applied by surface coating method are adhered to surface, micropores, capillary, etc. and maintain external water and wetting angle ∠100 or more. But it is permeable and has a property of permeating water vapor or carbon dioxide gas. Thus, inorganic materials have been used as remedial agents rather than neutralization inhibitors.

For this reason, an organic / inorganic hybrid anti-neutralizing agent has been developed by mixing some water-soluble organic systems. It is difficult to expect excellent effects on the two kinds of organic materials and inorganic materials, which are different materials, because they have disadvantages rather than two advantages.

Most of the anti-neutralization products currently in circulation are organic or organic / inorganic mixed products. They have low durability after construction and they are vulnerable to acid and organic solvents, so they have temporary water and water repellency. However, they require periodic management by shortening the life span. There is a high possibility that various problems will occur.

Alkali recovery agent (neutralization recovery agent) and neutralization inhibitor have been developed in many companies and research institutes in Korea, and they are being used in new construction and repair sites.

As a background of the present invention, there is a Korean Patent Registration No. 0404316, "Alkali Recovery Agent for Reinforced Concrete Structures with Anti-corrosive Properties" (Patent Document 1) as a patent for an organic / inorganic hybrid anti-neutralization agent. In the background art, it is stated that 50 to 70 parts by weight of an alkali aqueous solution and 30 to 50 parts by weight of a nitrite-based rust inhibitor are alkali rust inhibitors. The organic and inorganic hybrid anti-neutrals have the main purpose of restoring the neutralization to the rust prevention for the prevention of the abscess corrosion. In addition to the above, there are many patents related to rust inhibitor, but it is necessary to use organic system because it is mainly used for waterproofing.

Another technology to be a background of the present invention is a Korean Patent Registration No. 0982229 entitled "High Penetration Type Amphoteric Concrete Surface Treatment Composition and Method for Manufacturing the Same" as a patent for an alkaline restorative agent (Patent Document 2). The above-mentioned background art is an organic-inorganic hybrid type in which potassium silicate, sodium silicate and colloidal silica are the main components and additionally an organic hybrid resin binder is added. The insoluble composition penetrates into the concrete to form water- To 10 to 12, thereby restoring alkali and suppressing further neutralization. However, the above background art can be regarded as a patent developed for the purpose of enhancing the adhesion strength of a new / old repair agent whose primary purpose is to be used as a primer.

As another technology to be a background of the present invention, Korean Patent Laid-Open Publication No. 2009-0128058 entitled "Method for treating a silicone surface-permeable anti-absorption agent and a silicon-modified acrylic transparent coating material and a structure using the same, 3). In the background art, there is proposed a method of using a silicone system and a silicon-modified acrylic system as a neutralization inhibitor of the surface coating system to block moisture through the organic coating of the surface of the structure and reduce the penetration amount of the deteriorated ions. However, as described above, the above-mentioned background art has a limitation as a concrete neutralization inhibitor.

For the above reasons, a pure inorganic ionic material is required for adhesion of the same kind as the concrete concrete as an alkaline recovery agent and an anti-neutralization agent, and penetration into the pores and inter-particle capillaries to increase the water tightness and further prevent the neutralization. In this patent, colloidal silicic acid and an ionized alkali metal element are applied so as to penetrate into micropores, thereby restoring the alkalinity of pH 10-12.

Korea Patent No. 0404316 "Alkali recovery agent of rust-preventive reinforced concrete structure" Korean Patent Registration No. 0982229 "High penetration type amphoteric concrete surface treatment composition and method for producing the same" Korean Patent Laid-Open Publication No. 2009-0128058 entitled " Silicon-Based Permeability Absorbent, Silicon-Modified Acrylic Clearcoat and Composite Surface Treatment Method of Structures Using the Same "

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a colloidal silica which functions as a bridge in the re-defect of a neutralization concrete, an ionized alkali metal ion which acts as a cement reaction activation and a chemical reaction, carbonated water, consists of water to carry penetrate the composition to the concrete structure, the dried concrete surface has been demonstrated that coating during 250g / m ^2, the spray coating when 330g / m ² when the construction surface water repellency and neutralizing inhibitory effect, the penetration depth 3mm, pH 10 ~ 12. It is expected that the improvement of durability can be expected by improving the alkalinity of the concrete and improving the chemical stability of the surface. In addition, the surface of the chipped concrete is activated for repair, Remodeling of buildings that can improve adhesion performance during maintenance mortar construction The present invention has been made to solve the above problems.

The present invention relates to a solution capable of spraying, spraying and painting one part type of inorganic ionized water mixed with water, which comprises 5 to 8 parts by weight of colloidal silicic acid (SiO _{3 -x} ) 3-5 parts by weight of ionized sodium (Na ^{1 +} ); 1 to 10 parts by weight of ionized lithium (Li & ^{lt ; 1 +} & ^{gt ;} ); 25 to 75 parts by weight of carbonated water (H ₂ CO ₃ : CO ₂ concentration 4000 ppm / L to 15000 ppm / L) And 45 to 50 parts by weight of water. The present invention provides a concrete surface strengthening inorganic composition for remodeling a building.

Further, the colloidal silica (SiO _{3 -x} ) is a concrete reinforced concrete for the remodeling of a building characterized by mixing one or more materials of sodium silicate, potassium silicate, sodium silicate, colloidal silica, silica sol and silica gel To provide an inorganic composition.

The ionized sodium (Na ^{1 +} ) is characterized by a mixture of at least one of sodium sulphate, sodium lauryl sulphate, sodium gluconate, sodium lignosulphonate, sodium lauryl sulphate, and sodium ionizable to sodium dodecyl sulphate To provide a concrete surface strengthened inorganic composition for remodeling a building.

The ionized lithium (Li & ^{lt ; 1 +} & ^{gt ;} ) is dissolved in a solvent such as lithium hydroxide, lithium oxide, lithium carbonate, lithium fluoride, lithium phosphate, lithium chloride, lithium nitrate, methyllithium, ethyllithium, alkyllithium, Which is used for remodeling a building. The present invention provides a concrete surface strengthening inorganic composition for a building remodeling.

Further, the carbonated water (H ₂ CO ₃ ) is a carbonic acid aqueous solution which is obtained by dissolving CO ₂ in water or sodium carbonate, calcium carbonate and lithium carbonate dissolved in water and absorbed together with water to penetrate the concrete surface. The present invention provides a surface reinforced inorganic composition for concrete.

The concrete surface strengthening inorganic composition for remodeling a building of the present invention is composed of colloidal silica which acts as a bridge in the re-defect of the neutralization concrete, ionized alkali metal ion which acts as a cement reaction activation and chemical reaction, , consists of water to carry penetrate the composition to the concrete structure, the dried concrete surface has been demonstrated that coating during 250g / m ^2, the spray coating when 330g / m ² when the construction surface water repellency and neutralizing inhibitory effect, penetration depth of 3mm The pH of the concrete was restored to 10 ~ 12. The improvement of the alkalinity of the concrete and the chemical stability of the surface enhanced the durability of the concrete. In addition, the surface of the chipped concrete was activated for repair, It is very possible to improve the adhesion performance in the repair mortar construction. There are yonghan effect.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention, Shall not be construed as limiting.
1 is a photograph of the surface water repellency of the concrete surface strengthening inorganic composition for remodeling a building of the present invention.
FIG. 2 is a photograph of a concrete surface reinforced inorganic composition for remodeling a building on the surface of a concrete specimen according to an experimental example of the present invention, followed by carbonization and promotion.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

Hereinafter, the technical structure of the present invention will be described in detail with reference to the preferred embodiments.

The concrete surface strengthening inorganic composition for remodeling a concrete structure according to the present invention can prevent the pH recovery and subsequent neutralization of the neutralization zone in the concrete concrete prior to the remodeling of the old building to increase the reusability of the old concrete structure and increase the durability Securing effect.

The present invention relates to a concrete surface strengthening inorganic composition for remodeling a building capable of spraying, spraying and painting in one-component type, comprising 5 to 8 parts by weight of colloidal silicate (SiO _{3 -x} ) 3-5 parts by weight of ionized sodium (Na ¹⁺ ); 1 to 10 parts by weight of ionized lithium (Li & ^{lt ; 1 +} & ^{gt ;} ); 25 to 75 parts by weight of carbonated water (H ₂ CO ₃ : CO ₂ concentration 4000 ppm / L to 15000 ppm / L) 45 to 50 parts by weight of water.

The colloidal silicic acid is a molecular phase containing chemically unreacted electrons and has OH ^- or H ^- and is neutralized at a size of less than nanometer (nm), so that it is easy to penetrate at intervals of several nm between cement particles and cement hydrate particles And has a property of forming a new structural link by reacting with a mixed alkali metal ion and remaining unhydrated cement. With these properties, colloidal silicic acid improves the strength of the concrete by forming substantial recombination between the cement particles reduced by neutralization. However, colloidal silicic acid with a chemically unstable molecular phase reacts with an acidic system to form a chemically stable unreacted hydrate, so it is necessary to carefully clean the acidic system. In addition, the supply of excessive colloidal silicic acid may require a concentration control because it can react with carbonic acid water (H ₂ CO ₃ ) before penetration into the pores to generate large grains, thereby blocking inter-particle capillaries. In order to suppress the above reaction, the colloidal silicic acid must be not more than 8 parts by weight while the colloidal silicate penetrates to a sufficient depth together with the carrier water from the neutralized concrete surface, and it is preferably at least 5 parts by weight in order to exhibit the strength enhancement efficiency.

Particularly, the colloidal silicic acid (SiO _{3 -x} ) includes water-soluble silicic acid based on sodium silicate, potassium silicate, sodium silicate, colloidal silica, silica sol and silica gel, .

Ionized sodium (Na ^{1 +} ) is a strongly alkaline metal element that has high reactivity and facilitates electronic substitution to facilitate reactivation of cement hydrates in an inactive state (this phenomenon is in the alkaline recovery or neutralization recovery state). In addition, it reacts with CO ₂ in the additionally mixed carbonated water to form a sodium carbonate (NaCO ₃ ) crystal phase to fill the pores between the cement particles and to close the open pores to improve the watertightness of the concrete surface. Improves surface tension and improves durability from external factors. However, when a large amount of sodium is injected into the cracks, the expansion force of the crystal forming region is high, thereby giving an excessive stress between the surface and the sphere, causing surface peeling and peeling, and causing surface elution (whitening phenomenon) An appropriate amount of 3 to 5 parts by weight is required.

The most preferred ionized sodium (Na ^{1 +} ) is sodium hydroxide and sodium oxide, and it is particularly preferable to include sodium ionizable water such as sodium silicate, sodium lauryl sulfate, sodium gluconate, sodium lignosulfonate, sodium lauryl sulfate and sodium dodecyl sulfate And may include one or more of a mixture of two or more materials.

The ionized lithium (Li ^{1 +} ) is a strongly alkaline metal element and has a very high reactivity. Since it has the smallest size among the alkali elements, it can permeate into hydrated cement particles, (This phenomenon is capable of restoring alkaline recovery or neutralization), and is very high in vaporizability and water solubility, and is released and released from the cement constituent crystals, so that the durability of the concrete structure due to residual impurities is not problematic. However, excess lithium ions are more likely to react secondarily with other safe materials after activating the cement, and due to the expansion, it is possible to destroy the structural metrics and it is preferable to use 3 parts by weight or less.

Such ionized lithium (Li & ^{lt ; 1 +} & ^{gt ;} ) is dissolved in a solvent such as lithium hydroxide, lithium oxide, lithium carbonate, lithium fluoride, lithium phosphate, lithium chloride, lithium nitrate, methyl lithium, ethyl lithium, alkyl lithium, In particular, lithium silicate is most preferable.

Carbonated water (H ₂ CO ₃ ) can be obtained by dissolving CO ₂ in water or by dissolving sodium carbonate, calcium carbonate, or lithium carbonate in water and absorbing it with water to make it permeable to the concrete surface. is absorbed and penetrated into the concrete surface, the penetration of carbon dioxide are an activated Ca ² by alkali metal ions of sodium and lithium ^+, Na ^{+ 1,} _-x Al ₂ O _3, Si _{1 - x} of the crystal to react with O ₂ Straight A solid body is formed to fill the infiltrated micropores, interparticle capillaries, and glass network pores. In addition, the cement binder, which is broken due to neutralization, acts as a bridge with the alkali metal ions to induce recombination.

However, excessive carbon dioxide supply may cause additional neutralization of the concrete, so it is preferable to use carbonated water having a carbon dioxide concentration of 15000 ppm / L or more and 4000 ppm / L or more.

According to the concrete surface strengthening inorganic composition for remodeling a building of the present invention having the above structure, when the dried concrete surface is coated at a coating weight of 250 g / m ² and when spray coating is applied at 330 g / m ^2, the surface water repellency and anti- . In addition, the pH of the solution is 12 to 13, and the alkali recovery effect can be exhibited up to pH 10 to 12 at a maximum penetration depth of 3 mm.

&Quot; Experimental Example &

Hereinafter, the present invention will be described in more detail with reference to Experimental Examples. The present Experimental Examples are intended to illustrate the present invention more specifically through the most preferred embodiments, and the scope of the present invention is not limited to Experimental Examples.

FIG. 1 is a photograph of the surface water repellency of a concrete surface strengthening inorganic composition for remodeling a building of the present invention. As shown in FIG. 1, the concrete surface strengthening inorganic composition for remodeling a building is applied once to the concrete specimen surface, FIG. 2 is a photograph of a concrete surface reinforced inorganic composition for remodeling a building after coating the surface of the concrete according to an experimental example of the present invention and promoting the carbonization thereof. As shown in FIG. 2, A concrete surface strengthening inorganic composition for remodeling a building of the present invention is applied to the surface of the concrete, and the carbonization is promoted by using the method of KS F 2584: 2010.

5 parts by weight of colloidal silicic acid (SiO _{3 -x} ), 3 parts by weight of ionized sodium (Na ^{1 +} ), 2 parts by weight of ionized lithium (Li ^{1 +} ), carbonated water (H ₂ CO ₃ : CO ₂ concentration of 6000 ppm / ) 35 parts by weight and water 55 parts by weight, to prepare a 100% concrete remodeling concrete surface strengthening inorganic composition having a pH of 12.

Then, the concrete surface strengthening inorganic composition for remodeling the building was coated on the concrete surface to observe the water absorption and water tightness.

As shown in FIG. 1 (a), it can be confirmed that the concrete surface strengthening inorganic composition for remodeling a building is absorbed into concrete when the concrete surface strengthening inorganic composition for remodeling a building is applied once. As shown in FIG. 1 (b) It was confirmed that the surface was not absorbed to the surface when it was completely dried and then applied for a week after the application. This means that the concrete surface pore and the capillary between the cement particles are closed by the concrete surface strengthening inorganic composition for remodeling the building, and the water absorption rate is remarkably lowered. This result shows that it is possible to inhibit the penetration of additional moisture and dissolved harmful factors from the outside when applying concrete surface strengthening inorganic composition for remodeling of a building.

In addition, if it is judged that sufficient amount of concrete surface strengthening inorganic composition for remodeling of buildings can not be supplied by one application, such water repellency can not be exhibited within one hour after re-application of secondary coating, so that it is possible to apply concrete surface strengthening inorganic composition for remodeling concrete for several times.

In Fig. 2, the neutralization promotion experiment was carried out through the KS F 2584: 2010 method for the concrete surface-strengthened inorganic composition-applied concrete and the uncoated concrete for the remodeling of the building.

As shown in FIG. 2 (a), when the specimen coated with the concrete surface strengthening inorganic composition for remodeling a building was neutralized for 2 weeks, the penetration depth of the concrete was 0 mm. As shown in FIG. 2 (b) Neutralization of penetration depth of 1.5 ~ 2mm proceeded when neutronization was accelerated for 2 weeks in specimens not coated with reinforcing inorganic composition.

As shown in FIG. 2 (c), when the specimens coated with the concrete surface strengthening inorganic composition for remodeling a building were neutralized for 6 weeks, neutralization of penetration depths of 1 to 5 mm progressed. As shown in FIG. 2 (d) In the case of specimens coated with reinforced concrete surface strengthened inorganic composition for remodeling, neutralization of penetration depth of 15 to 21 mm progressed during 6 weeks of neutralization promotion.

The above-mentioned concrete surface strengthening inorganic composition for remodeling a building of the present invention is characterized in that colloidal silica which acts as a bridge in the re-defect of the neutralization concrete, ionized alkali metal ion which acts as a cement reaction and crosslinks during chemical reaction, carbonated water, consists of water to carry penetrate the composition to the concrete structure, the dried concrete surface has been demonstrated that coating during 250g / m ^2, the spray coating when 330g / m ² when the construction surface water repellency and neutralization, inhibiting effect for, It showed the recovery of pH 10 ~ 12 with depth of penetration of 3mm. It can improve the alkalinity of concrete concrete and increase the chemical stability of surface, so that durability can be improved and the surface of chipped concrete is activated Improved adhesive performance in new concrete and maintenance mortar Which has a very beneficial effect.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

One :

Claims (5)

It is a solution which can spray, spray and paint in one-component type with inorganic ion water mixed with water,
5 to 8 parts by weight of colloidal silicic acid (SiO _{3 -x} );
3-5 parts by weight of ionized sodium (Na ^{1 +} );
1 to 10 parts by weight of ionized lithium (Li & ^{lt ; 1 +} & ^{gt ;} );
25 to 75 parts by weight of carbonated water (H ₂ CO ₃ : CO ₂ concentration 4000 ppm / L to 15000 ppm / L)
And 45 to 50 parts by weight of water. The present invention relates to a concrete surface strengthening inorganic composition for remodeling a building. The method according to claim 1,
Colloidal silicic acid (SiO _{3 -x} )
Characterized in that one or more materials selected from the group consisting of sodium silicate, potassium silicate, sodium silicate, colloidal silica, silica sol and silica gel are mixed together. The method according to claim 1,
Ionized sodium (Na ¹⁺ )
A concrete for remodeling a building characterized by mixing one or more materials selected from sodium silicate, sodium lauryl sulfate, sodium gluconate, sodium lignosulfonate, sodium laurylsulfate and sodium dodecylsulfate available for ionization The method according to claim 1,
Ionized lithium (Li ^{1 +} ) is ionized in a solvent using lithium hydroxide, lithium oxide, lithium carbonate, lithium fluoride, lithium phosphate, lithium chloride, lithium nitrate, methyllithium, ethyllithium, alkyllithium, ethyllithium, Wherein the composition is used for remodeling a building. The method according to claim 1,
Carbonated water (H ₂ CO ₃₎ will be dissolved CO ₂ in the water or sodium carbonate, calcium carbonate, is absorbed with water to write to the lithium carbonate is dissolved in water of concrete for building renovation, characterized in that the concrete surface penetration possible carbonate solution Surface strengthening inorganic composition.

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