KR101700652B1 - maintenance method for concrete crack or exfoliation - Google Patents

Abstract

The present invention relates to a reinforcement and maintenance method for a crack of a reinforcing bar concrete structure, a concrete exfoliation portion, and a structural material, which can effectively and greatly repair a crack of an old reinforcing bar concrete structure, concrete exfoliation, and corrosion of a structural material, and further, reinforce performance with respect to the structural material to recover for secondary corrosion of the structural material to be prevented to maintain a repair state of a concrete structure for a long time. The present invention comprises: a surface treatment step with respect to a crack of a reinforcing bar concrete structure, concrete exfoliation, and a reinforcing bar exposed portion; a reinforcement or a reinforcement and repair construction step; an elastic repair polishing material construction step; and a finishing polishing material construction step. According to the present invention, as a crack, exfoliation, and a reinforcing bar exposed portion are repaired, and a neutralized structural material is reduced to an alkali, corrosion of the structural material caused by neutralization can be prevented to improve durability of a reinforcing bar concrete structure in which maintenance work is complete. Moreover, high elongation can be maintained by an elastic repair polishing material and a finishing polishing material to prevent deformation damage of the repair polishing material caused by a change in a temperature in accordance with seasons, and adhesion between components for maintenance is improved to prevent corrosion and exfoliation of a structural material caused by a leakage.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced concrete structure,

The present invention relates to a method of reinforcing and repairing a reinforced concrete structure and a method of reinforcing and repairing a concrete portion and a structural member of the reinforced concrete structure. More particularly, the present invention relates to a method for efficiently and excellently cracking an aged reinforced concrete structure, The reinforced concrete structure is designed to prevent the secondary corrosion of the structural material by reinforcing the performance of the structural material and to maintain the repair condition of the concrete structure. And to provide a maintenance method.

As the time elapses, the quality and performance of the structural material deteriorate due to internal and external influences, physical and chemical factors, and the deterioration phenomenon occurs with time. The deterioration phenomenon occurring in the reinforced concrete structure is caused by the concrete Cracks on the structure, concrete cracking, and rebar exposure.

One of the important factors causing deterioration in reinforced concrete structures is the carbonation of concrete (carbonation-carbonatation). Concrete carbonation is a phenomenon in which carbon dioxide or other erosive acid gas penetrates into the atmosphere, It occurs by causing a chemical reaction with a component. When carbonation proceeds by a chemical reaction, alkali is lost and the structural material is neutralized, thereby accelerating the deterioration phenomenon.

When a phenomenon such as cracks, cracks in concrete, and exposure to reinforcing steel occurs in a reinforced concrete structure, durability and strength of the structure are lowered, which not only affects the stability of the structure but also decreases the waterproofing property. In case of continuous corrosion on leaks and structural materials, it may cause durability and strength reduction of the entire concrete structure. If cracks of concrete structure, peeling of structural materials and corrosion of steel bars are left for a long time, have.

Cracks in reinforced concrete structures, cracks in concrete, and corrosion of reinforcing steel can be caused by plastic deformation, drying shrinkage or various other causes depending on the design load of the structure, the characteristics of the structural materials and the mixing conditions, as well as external environmental factors such as neutralization and deterioration. If concrete rainwater infiltrates into the structure through cracks and cracks in the concrete, the strength and strength of the concrete structure will decrease, and as the neutralization of the structural material accelerates, structural defects due to corrosion of the structural material, Not only does it cause various problems, but also fine dusts that are not good for appearance and cracks and cracks in concrete are likely to have a detrimental effect on residents' health.

Therefore, for a reinforced concrete structure in which cracks, cracks in concrete, and corrosion of reinforcing steel occur, it is necessary to perform rapid repair and reinforcement work on the damaged part. In the method for repairing and reinforcing cracks in a reinforced concrete structure, have.
[Patent Document 1] Korean Patent No. 10-0917425 (Registered on September 09, 2009) "Concrete Crack Repair and Rehabilitation Method"
[Patent Document 2] Korea Patent No. 10-1086018 (registered on November 16, 2011) "Mineral-based cracking filler and cracked concrete repair method using the same"
[Document 3] Korean Registered Patent No. 10-1087700 (Registered on November 22, 2011) "Filler for Concrete Crack Repair and Repair Method Using the Same"

Typical repair work on cracks, concrete cracks, and exposed rebar (corrosion rebar) in reinforced concrete structures involves surface treatment of cracks, concrete cracks and exposed rebar, rusting and repair of exposed rebar, repair mortar construction, Construction, application of finishing paint, and the like.

The above-mentioned conventional repair work on cracks and cracks of concrete structures focuses on the repair (burial restoration) and the repair (corrosion prevention) of the damaged portions of concrete caused by deterioration and thereby the concrete neutralization, which is an essential problem of the deterioration of concrete, Therefore, deterioration due to neutralization can not be avoided even after the maintenance work.

In order to prevent the exposed reinforcing steel parts from rusting, a rustproofing agent is applied to impart rustproofing function to the rust preventive agent. Then, the rustproofing and repairing of the concrete rust part is carried out using the water-soluble restorative mortar composition. It is difficult to maintain the maintenance state for a long period of time due to the occurrence of peeling phenomenon due to a decrease in the adhesive strength between the surfaces of the mortar composition. Further, in the case of the repair coating film used for the construction, the coating type primer (Rainfall, etc.) after the completion of the paint, not only causes a floating phenomenon of the coating, but also the water resistance is strengthened so as to secure the waterproof property, so that the paint affinity is lowered. (Different color) and discoloration phenomenon Problems such as has been pointed out.

As a result, when the repair work is performed through the repair work of the conventional concrete structure, firstly, the neutralization of the unrecovered concrete causes the deterioration phenomenon again even though the maintenance work is done by spending a high cost, thereby causing secondary damage (crack, In addition, it can reduce the durability of the entire concrete structure. Second, the cracks of the concrete structure and the adhesion of the repair mortar applied to the cracked portion of the concrete are reduced, There is a large risk of peeling phenomenon and thus leakage. Third, the secondary deterioration of the repaired area accelerates due to the occurrence of leaking due to the repellent phenomenon due to the repellent phenomenon of the repair film. Fourth, Deformation damage due to the change occurs; and fifth, And discoloration phenomenon occurs. As a result, the construction quality of the repair work is lowered due to the above problems, and an economic loss due to the rework due to the frequent reworking demand for the repair work is occurring.

In addition, the conventional concrete cracking and crack repairing work is performed by using a combination of a mortar for repair and a repairing composition, etc., on the site in the field, which is a time-consuming factor for maintenance work, It is a factor that hinders construction.

The present invention has been made in order to solve the above-mentioned problems caused by repair work of a conventional concrete structure, and it is an object of the present invention to provide a rust-preventive and reinforcing composition or a rust- In order to prevent rusting and secondary deterioration of the structural material of the cracked and cracked concrete area by inducing the alkali reduction to the neutralized concrete by applying the pretreatment construction to the crushed area, And it is possible to prevent the peeling phenomenon by improving the adhesion of the structural material and the restorative mortar composition for rust prevention and reinforcement. By using the composition specialized for each crack repairing and repairing step, it is possible to perform consistent and excellent crack repairing work, It is possible to perform maintenance work on cracks It is possible to prevent the deformation of the repair coat due to the seasonal temperature change by restoring the durability of the structure by fully realizing heat repair and leakage and maintaining the high elongation of the repair composition, The present invention provides a reinforcing concrete structure having cracks or a reinforcing and repairing method for a concrete part and a structural part of a reinforced concrete structure which is completed with a technical point of view in order to prevent corrosion and peeling of a structural material due to leakage by increasing adhesiveness.

In order to achieve the above technical object, the present invention provides a method for removing cracks or concrete, removing laitance, dust and residual organic solvent after chipping work on expanded concrete, protruding concrete, A surface treatment step of improving the adhesion of cracks or cracks in the concrete, a step of reinforcing or reinforcing and restoring the concrete cracks or concrete cracks and exposed portions of the reinforcing bars, an elastic repair film application step to the reinforcing or reinforcing and restoring portions, Finish for Finish Coating In construction of reinforcing concrete structure cracks or reinforcing and repairing method for concrete loam and structural materials,

The reinforcing or reinforcing and repairing step may be performed by using any one of a silicate, lithium silicate (Li4SiO4), potassium hydroxide (KOH), distilled water, methoxy silane, isopropyl alcohol (IPA ) Or a mixture of two or more of the above-mentioned components (a), (b), and (c) an expansion agent, a methoxy silane, a superplasticizer, an admixture agent, an isopropyl alcohol (IPA), a redispersible resin, an antifoaming agent, a homopolymer A reinforcing and restoring composition formed by mixing and agitating polypropylene (homopolymer polypropylene) fibers is applied to the surface treated cracks or concrete slabs and exposed portions of reinforcing bars, or And then drying the resultant mixture; The step of applying the elastic repair coating film may include a step of coating the surface of the elastic repair coating film with a solvent such as acrylic polymer, calcium carbonate, TiO2, a thickener, a wetting agent, a pH adjuster, methyl cellulose (MC) , Water (water) mixed and agitated is buried or coated on a concrete crack part, a concrete slip and a reinforcing steel exposed part, and dried, and the step of applying the finish coating film comprises drying The surface of the film is coated with a mixture of acryl polymer, calcium carbonate, titanium dioxide (TiO2), a thickener, a coloring pigment, a wetting agent, a pH adjuster and water And a step of applying a finish coating composition prepared by stirring and drying the coating composition so as to reinforce and repair cracks or concrete peeling and exposed portions of the reinforcing steel It is a feature of the lacquer.

The crack reinforcing and repairing method of the concrete structure proposed in the present invention is capable of reinforcing and repairing construction by a specialized composition for each operation step and it is provided with a function of rusting cracked concrete or cracked portion of concrete in the course of repairing In addition to this, by inducing alkali reduction to the structural material, it is possible to fundamentally prevent re-corrosion and secondary deterioration of the structural material due to neutralization of the reinforced and repaired portion, thereby improving durability of the completed concrete structure You can.

Also, by maintaining the high elongation of the coating layer by the elastic repair finishing composition and the finish coating composition, deformation damage of the repair coat due to seasonal temperature change can be prevented, and the composition for reinforcing or strengthening and repairing and the elastic repair coat composition And corrosion of the structural material due to leakage of water can be prevented by increasing the adhesion between the coating composition and the finish coating composition. As a result, the dried concrete of the concrete, which is reinforced and repaired according to the present invention, ), And it is possible to maintain excellent and robust maintenance state for a long time.

Since each composition according to the construction stage optimized for the implementation of the present invention is a form that can be provided for immediate use in a work site, it can be easily used even for an inexperienced worker, and is easy to work with, It is possible to prevent damage due to impact and deformation by providing a repair composition having excellent durability and improved impact resistance and elasticity to prevent secondary corrosion of the structural material at a maintenance work site, Is an invention whose expected effect is indeed beneficial.

FIG. 1 is a process diagram of a reinforcing concrete structure to be reinforced and repaired according to the present invention; FIG.
FIG. 2 is a reference view showing a process of reinforcing and repairing cracks in concrete conducted by the present invention. FIG.
FIG. 3 is a reference view showing a process of reinforcing and repairing concrete exposed and reinforcing bars exposed by the present invention. FIG.

FIG. 1 is a process diagram of a method of reinforcing and repairing a reinforced concrete structure according to an embodiment of the present invention. Referring to FIG. 1, , A reinforcing or reinforcing and restoring construction step, an elastic repair coating film construction step, and a finish coating film construction step, and the detailed implementation of each construction step is as follows.

Step 1 - This process is a pretreatment process for reinforcing and repairing cracks or peeling areas and structural materials of concrete. It is used for chipping or cracking of concrete or exposed parts of reinforcing steel through chipping using a dedicated hand tool or power tool. Surface treatment of expanded concrete, extruded concrete, exposed reinforcing steel, and defective coating shall be carried out, and laitance, dust and residual organic solvent should be removed to improve the adhesion of cracks or cracks in concrete.

Two-step process - Reinforcement or reinforcement for cracking or peeling of concrete structure and reinforcement or restoration of exposed parts of reinforced concrete, securing alkali recovery and anti-rusting function of structural material and restoration for reclamation for reinforcement. Reinforcement for cracks in small, unexposed small cracks (such as fine multi-grooved grooves or cracks), and reinforcement and restoration of concrete loosened areas where concrete is released or exposed.

<Reinforcement against cracks>

Such as silicate, lithium silicate (Li4SiO4), potassium hydroxide (KOH) having a purity of 95%, distilled water, methoxy silane, isopropyl alcohol (IPA) The reinforcing composition is mixed and agitated to form a reinforcing composition. The reinforcing composition is applied as if it is sufficiently wetted on a crack site of a concrete by using a brush, a roller or a spray or the like, followed by drying (curing) Reduces the structural material of cracks to alkali and provides anti-rust function to exposed reinforcing bars to prevent re-corrosion due to neutralization of concrete structural materials and to restore durability.

In the reinforcing composition, a strong alkaline-based potassium hydroxide and an alkali-based lithium silicate are reacted with a structural material to absorb carbon dioxide and reduce a neutralized structural material to alkali to prevent re-corrosion due to neutralization. The toxic silane is intended to improve elasticity, abrasion resistance, tensile strength and the like, and isopropyl alcohol is to react with the exposed reinforcing bar to impart anticorrosive function.

The reinforcing composition used for the reinforcing construction for the crack according to the present invention is formed in the composition ratio shown in Table 1 below.

Composition substance Incorporation (kg) Soluble silicate 2 to 4 Lithium silicate 2 to 3.5 Potassium hydroxide (KOH) 1.5 to 2 Distilled water 1.5 to 2.1 Methoxy silane 0.05 to 0.5 Isopropyl alcohol (IPA) 0.1 to 0.5

The reinforcing composition prepared as described above is a mucilage-like shape in the same form as a paint having an enemy viscosity.

<Reinforcement and Restoration of Concrete Pavement and Reinforced Concrete Exposed Site>

Silica, portland cement, soluble silicate, lithium silicate (Li4SiO4), potassium hydroxide (KOH), distilled water, expansion agent, methoxy silane Such as superplasticizers, admixture agents, isopropyl alcohol (IPA), redispersible resins, antifoaming agents, homopolymer polypropylene fibers, and the like. The reinforcing and restoring composition prepared by mixing and stirring the materials is applied to the concrete release area (exposed area of the reinforcing steel) subjected to the surface treatment using a tool such as a trowel to carry out landfill restoration for the release area, Reducing the structural material of the cracked area to alkali and providing the anti-rust function to the exposed reinforced concrete, the neutralization of the concrete structural material Give it to prevent corrosion due to material recovery and durability.

In the above reinforcing and restoring composition, silica and Portland cement are used for reclamation and restoration of the cracked part, and do not have a sense of heterogeneity with conventional concrete structural materials. Potassium hydroxide of strong alkaline and lithium silicate, which is an alkali- Methoxysilane is intended to improve elasticity, abrasion resistance, tensile strength and the like, and isopropyl alcohol is used to prevent the re-corrosion caused by neutralization by absorbing carbon dioxide and reducing the neutralized structural material to alkali. To provide a rust-preventive function.

The reinforcing and restoring composition used for reinforcement and restoration of the concrete slip and the exposed portion of the reinforcing steel according to the present invention is formed as shown in Table 2 below.

Composition substance Incorporation (kg) Silica 5 to 6 Portland cement 3 to 4 Soluble silicate 2 to 4 Lithium silicate (Li4SiO4) 2 to 3.5 Potassium hydroxide 1.5 to 2 Distilled water 1.5 to 2.1 Expansion agent 0.3 to 1 Methoxy silane 0.05 to 0.5 Superplasticizer 0.01 to 0.1 Admixture agent 0.5 to 1 Isopropyl alcohol 0.1 to 0.5 Redispersible resin 0.1 to 0.5 Antifoaming agent 0.001 to 0.1 Homopolymer polypropylene fiber 0.001 to 0.1

The composition for reinforcing and restoring as described above is in the form of a dough such as a putty, and it is filled in the surface of the concrete subjected to the surface treatment using a tool such as trowel, When the restoring composition is filled in the release area where the reinforcing bar is exposed, isopropyl alcohol constituting the composition reacts with the reinforcing steel surface to impart a rust inhibitive function to the reinforcing bar.

Three-step process - This process prevents surface corrosion of concrete cracks, increases adhesive strength, strengthens durability against external physical force (environment, climate) and prevents deformation damage (crack) due to shrinkage and expansion A thickener, a wetting agent, a pH adjusting agent, a methyl cellulose (MC), a polyvinyl alcohol, a polyvinyl alcohol, a polyvinyl alcohol, Water or the like to the surface of a reinforced or restored composition buried in the cracked portion of the concrete and then dried to form an elastic repair coating composition, So that a coating film is formed.

The acrylic polymer serving as a binder of the elastic repair coating composition has excellent physical and chemical performances and is quick in curing to shorten the curing time of the elastic composition for maintenance and shorten the construction period. crack adhesion, adhesive strength, water resistance, and alkali resistance, which are preferable as a binder of a repair elastic composition.

In the elastic repair coating composition, calcium carbonate is used to neutralize the acid and reinforce the viscosity. Titanium dioxide is used for imparting hue to the elastic repair coating composition and shielding ultraviolet rays. The viscosity of the elastic repair coating composition is determined by the viscosity of the elastic repair coating composition The pH adjusting agent is for adjusting the acidity of the elastic repair coating film composition to an alkali group of about pH 12 to pH 14, and the pH adjuster is for controlling the acidity of the elastic repair coating film composition by an alkali group, Is intended to improve viscosity and adhesion as a thickening aid.

The titanium dioxide constituting the elastic repair coating film composition is excellent in self-cleaning function against bacteria and bacteria and can prevent the durability from being deteriorated due to a change in physical properties of the elastic repair coating composition according to external factors , and the pH adjusting agent improves the storage stability, miscibility and dispersibility of the elastic repair coating composition by controlling the acidity.

The elastic repair coating film composition used in the elastic repair coating film construction according to the present invention is formed in the composition ratio shown in Table 3 below.

Composition substance Incorporation (kg) Acryl polymer 4 to 5 Calcium carbonate 4 to 5 Titanium dioxide (TiO2) 0.15 to 0.3 Thickener 0.2 to 0.3 Wetting agent 0.01 to 0.05 pH adjusting agent 0.01 to 0.03 Methyl cellulose (MC) 0.01 to 0.02 Water 0.3 to 0.4

The elastic repair coating composition prepared as described above is a putty paste composition having an appropriate viscosity.

When the mixing amount of the acrylic polymer is less than that in the examples of Table 3 in forming the elastic repair coating composition according to the present invention, the physical and chemical performance deteriorates and the adhesion strength is lowered and the water resistance and alkali resistance are less than the standards. Is higher than that in the Examples described in Table 3, the physical and chemical performance is excellent, but the price of the raw material is increased. In order to satisfy both the performance and economical efficiency, incorporation of the acrylic polymer in the mixing amount range of the embodiment shown in Table 3 desirable.

 When the amount of the calcium carbonate mixed in the composition for forming the elastic repair coating film composition is smaller than that in the examples shown in Table 3, the content of the acrylic polymer is relatively increased, resulting in an increase in the product price. It is preferable to incorporate calcium carbonate in the mixing amount range of the embodiment shown in Table 3 in order to satisfy both performance and economical efficiency because the viscosity of the elastic finish coating composition is increased and workability is very poor.

Meanwhile, the elastic repair coating composition according to the present invention may be prepared by further adding 0.01 to 0.1 kg of an antifoaming agent and 0.01 to 0.1 kg of a dispersing agent as an additive material.

When the antifoaming agent is added to the elastic repair coating composition as described above, bubble formation is suppressed in the process of mixing and stirring the acrylic polymer, calcium carbonate and other composition materials, and the bubbles generated by the roller operation The defoaming effect can be obtained. The defoaming agent incorporated into the elastic repair coating composition prevents the coating film defects (floating phenomenon and bulging) caused by the bubbles during the formation of the elastic repair coating film, Thereby improving the tensile strength and adhesion strength of the elastic repair coating film.

If a dispersant is added to the elastic repair coat composition, the composition for forming the elastic repair coat composition can be dispersed evenly so that the elastic repair coat composition can be easily manufactured.

4 step process - This process is a finishing coat construction process to maximize the elasticity and waterproofing performance. It is composed of acrylic polymer, calcium carbonate, titanium dioxide (TiO2), thickener, a wetting agent, a pH adjuster, water, and the like are mixed and agitated to form a finish coating film on the surface of the elastic repair coating composition, followed by drying to form a finish coating film.

The acrylic polymer which acts as a binder of the finish coating composition has excellent physical and chemical performances and can be cured quickly, which can shorten the curing time of the elastic composition and shorten the construction period. The acrylic polymer is excellent in adhesion strength, And is preferable as a binder of the finish coating composition.

In the finish coating composition, the calcium carbonate is for neutralizing the acid and reinforcing the viscosity, the titanium dioxide for blocking the ultraviolet rays, the thickener for improving the viscosity and adhesion of the elastic composition for maintenance, The wetting agent is for improving the fluidity of the finish coating composition by decreasing the surface tension, and the pH adjusting agent is used to adjust the acidity of the coating composition for repair use to an alkali group of about pH 12 to pH 14 And methyl cellulose is used as a thickening aid to improve viscosity and adhesion.

The titanium dioxide constituting the finish coating composition can prevent durability from being deteriorated due to changes in physical properties of the finish coating composition due to external factors due to self-cleaning function against foreign substances and resistance to bacteria, The controlling agent improves the storage stability, miscibility and dispersibility of the elastic composition for maintenance by controlling the acidity.

The finish coating composition used in the finish coating according to the present invention is prepared in the composition ratio shown in Table 4 below.

Composition substance Incorporation (kg) Acryl polymer 6 to 7 Calcium carbonate 2 to 2.5 Titanium dioxide (TiO2) 0.3 to 0.5 Thickener 0.2 to 0.3 A coloring pigment (pigment) 0.05 to 0.1 Wetting agent 0.03 to 0.05 pH adjusting agent 0.01 to 0.03 Water 0.3 to 0.4

The finish coating composition thus formed is a putty paste composition having an appropriate viscosity.

When the mixing amount of the acrylic polymer in the composition of the finish coating composition according to the present invention is smaller than that of the examples shown in Table 4, the physical and chemical performance deteriorates and the adhesion strength and water resistance and alkali resistance do not meet the standards. In the case where the amount of the acrylic polymer is higher than that in the examples of Table 4, it is preferable to incorporate the acrylic polymer in the mixing amount range of the embodiment shown in Table 4 in order to satisfy both the performance and the economical efficiency because the physical and chemical performance is excellent but the cost of the raw material is increased Do.

 When the amount of the calcium carbonate mixed in the composition of the finish coating composition is smaller than that in the examples of Table 4, the content of the acrylic polymer is relatively increased, resulting in an increase in the price of the product. If the amount is higher than that in Examples, the viscosity of the finish coating composition is increased, so that the workability is very poor. In order to satisfy both performance and economical efficiency, it is preferable to incorporate calcium carbonate in the mixing amount range of the embodiment shown in Table 4.

Meanwhile, the finish coating composition according to the present invention can be prepared by incorporating 0.01 to 0.1 kg of an antifoaming agent and 0.01 to 0.1 kg of a dispersing agent as an additive additive.

When the antifoaming agent is added to the finish coating composition as described above, bubbling is suppressed in the process of mixing and stirring the acrylic polymer, calcium carbonate and other composition materials, and the defoaming effect of the bubbles generated by the roller operation The antifoaming agent incorporated into the finish coating composition prevents not only the formation of coating film (lifting phenomenon, bulging) due to bubbles during formation of the finish coat layer but also the inside and outside bubbles formed in the finish coating layer are removed, To improve the tensile strength and the adhesive strength.

If a dispersant is added to the finish coat composition, the composition can be easily dispersed so that each composition material constituting the finish coat composition can be mixed well, thereby facilitating the production of the finish coat composition.

Through the above-mentioned sequential process of reinforcing and repairing method, it is possible to finish the reinforcement and repair of the cracks of the concrete structure, the exposed portion of the concrete and the exposed portion of the reinforcing steel. In the reinforcement and maintenance of the concrete structure, An elastic repair coating film and a finish coating film are sequentially formed on the upper surface of the restorative composition.

FIG. 2 is a reference view showing a reinforcing and repairing process of a concrete crack region according to the present invention. As shown in FIG. 2, the reinforcing composition S1 is coated on a cracked region R1 of a concrete structure C And the elastic repair film S3 is filled in the region where the reinforcing composition S1 is applied (recessed groove of the cracked portion), and the finish coat S4 is formed on the upper surface of the elastic repair film S3

When the repairing and repairing method according to the present invention is completed, repairing composition is completed, potassium alkoxide of the strong alkaline system constituting the restoration composition and lithium silicate, which is an alkali-based penetrant, react with the structural material to absorb carbon dioxide, The isopropyl alcohol constituting the reinforcing composition reacts with the exposed reinforcing bar to provide a rust preventing function, thereby preventing the corrosion of the structural material and improving the durability. The elastic repair coatings filled in the cracks strengthen the durability against external physical forces (environment, climate), prevent deformation damage (cracks) due to shrinkage and expansion, provide a finish applied on the upper surface of the elastic repair coating The coating maximizes elasticity and waterproof performance.

FIG. 3 is a reference view showing a process of reinforcing and repairing concrete exposed and reinforced concrete exposed portions according to the present invention. As shown in FIG. 3, The elastic restoration coating S3 is applied to the surface of the reinforcing and restoring composition S2 and the elastic restoration coating S3 is applied to the upper surface of the elastic restoration coating S3, S4 are formed.

When the concrete is peeled off and the repair work is completed on the exposed portions of the reinforcing steel by the reinforcing and repairing method according to the present invention, the strong alkaline-based potassium hydroxide and the alkali-based penetrating agent lithium silicate, which constitute the reinforcing and restoring composition, And the neutralized structural material is reduced to alkali to prevent re-corrosion due to neutralization. The isopropyl alcohol constituting the reinforcing and restoring composition reacts with the exposed reinforcing bar to provide a rust preventing function to prevent the corrosion of the structural material And the durability is enhanced. The elastic repair coating applied on the peeling area enhances the durability against the external physical force (environment, weather), prevents deformation damage (crack) due to contraction and expansion, The finish coat applied on the top surface maximizes the elasticity and waterproof performance.

C: concrete structure P: exposed reinforcing steel
R1: Concrete cracking site R2: Concrete cracking site
S1: reinforcing composition S2: reinforcing and restoring composition
S3: elastic repair film S4: finish film

Claims (6)

Cracks or cracks in concrete, cracks or cracks in exposed areas of reinforced concrete, or protruding concrete, or chipping on poor coatings, and removing laitance, dust, and residual organic solvents to improve the adhesion of cracks or cracks in concrete A reinforced concrete film construction step, a reinforcing concrete structure cracking or reinforcement for a concrete release area and a structural member by a step of applying an elastic repair film, In constructing the repair method;
The reinforcing or reinforcing and restoring step may be performed by using 2 to 3.5 kg of lithium silicate (Li 4 SiO 4), 1.5 to 2 kg of potassium hydroxide (KOH) of 95% purity, 1.5 to 2 kg of distilled water, And 5 to 6 kg of a reinforcing composition or silica prepared by mixing and stirring 2.1 kg of an epoxy resin, 0.05 to 0.5 kg of methoxy silane and 0.1 to 0.5 kg of isopropyl alcohol (IPA) 3 to 4 kg of cement, 2 to 4 kg of silicate, 2 to 3.5 kg of lithium silicate (Li 4 SiO 4), 1.5 to 2 kg of potassium hydroxide (KOH), 1.5 to 2.1 kg of distilled water, 0.3 to 1 kg of methoxy silane, 0.05 to 0.5 kg of methoxy silane, 0.01 to 0.1 kg of superplasticizer, 0.5 to 1 kg of admixture agent, 0.1 to 0.5 kg of isopropyl alcohol (IPA) Redispersible resin 0.1 to 0.5 kg, antifoaming agent 0.001 to 0.0 1 kg of a homopolymer polypropylene fiber and 0.001 to 0.01 kg of a homopolymer polypropylene fiber is mixed and agitated to form a reinforcing and restoring composition;
The elastic repair coating film forming step may include 4 to 5 kg of calcium carbonate, 0.15 to 0.3 kg of titanium dioxide (TiO 2), 0.2 to 0.3 kg of a thickener, 4 to 5 kg of a wetting agent a reinforcing composition is prepared by mixing 0.01 to 0.05 kg of a wetting agent, 0.01 to 0.03 kg of a pH adjusting agent, 0.01 to 0.02 kg of methyl cellulose (MC) and 0.3 to 0.4 kg of water, The method comprising: applying a coating on a surface of a reinforced and restored composition buried in a cracked portion of a coated concrete or buried in a exposed portion of the reinforced concrete;
The finish coating step may be carried out by adding 2 to 2.5 kg of calcium carbonate, 0.3 to 0.5 kg of titanium dioxide (TiO 2), 0.2 to 0.3 kg of a thickener, 6 to 7 kg of a coloring pigment 0.05 to 0.1 kg of a pigment, 0.05 to 0.1 kg of a wetting agent, 0.03 to 0.05 kg of a wetting agent, 0.01 to 0.03 kg of a pH adjusting agent and 0.3 to 0.4 kg of water were mixed and agitated to prepare a finish coating composition And then drying the reinforced concrete structure. The method of reinforcing and repairing the reinforced concrete structure is as follows.
The method of claim 1, further comprising:
In the reinforcing or restoring step, the reinforcing composition is applied to the cracked portion where the reinforcing bars are not exposed by applying a brush, a roller or a spraying means to reinforce the reinforcing composition. When the concrete is peeled off or exposed to the reinforcing steel, Reinforced concrete structure is reinforced and restored by embedding it with trowel means (trowel). delete delete delete delete

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