KR101551842B1 - Method for Repairing Deteriorate Parts in Concrete Using Mortar - Google Patents

Abstract

The present invention relates to mortar for repairing a cross-section of a concrete structure and a method for repairing a cross-section using the same and, more specifically, to mortar for repairing a cross-section and a method for repairing a cross-section using the same, capable of maximizing repair effects with respect to a deterioration region of concrete, rapidly regenerating a damaged region or a region predicted to be damaged as an original state at the same time, and representing excellent durability and strength by preventing water from permeating into the inside.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for repairing a section of a concrete structure using a mortar for repairing a section,

The present invention relates to a mortar for repairing an end face of a concrete structure and a method for repairing the end face using the same. More particularly, the present invention relates to a mortar for repairing an end face of a concrete structure, Which is capable of regenerating the surface of the mortar, and at the same time, preventing intrusion of water, thereby exhibiting excellent durability and strength.

In civil engineering and construction, various reinforced concrete structures are subject to deterioration phenomena such as corrosion, neutralization, frost damage and salt damage due to the combined influence of external environmental factors. The strength and durability of the structure itself is deteriorated and the safety is deteriorated. Therefore, a part of the concrete structure is required to properly repair and repair the section of the deteriorated concrete.

In general, the deterioration phenomenon is caused by the corrosion of the concrete inside the concrete as the pH of the concrete is lowered due to the chemical corrosion environment, neutralization, frost, and salt damage of the concrete structure and the reinforcing steel expansion due to the corrosion of the reinforcing steel is repeated. And the life of the concrete is shortened.

In recent years, concrete structures are seriously damaged due to the corrosion of reinforcing bars caused by the use of sea sand that has not been stripped of salt and the chloride used for winter season .

BACKGROUND OF THE INVENTION [0002] Conventionally used repair materials for repairing and reinforcing concrete structures include acrylic or epoxy mortar, polymeric cement mortar or a corrosion inhibiting method using a nitrite-based corrosion inhibiting agent. Among them, acrylic or epoxy mortar has acrylic or epoxy Epoxy resin coating film is formed to basically block external chlorine ions and carbon dioxide to suppress deterioration phenomenon. However, since the temperature dependency of curing is high, it is difficult to cure at low temperature and the physical and chemical heterogeneity (thermal expansion coefficient Etc.), problems such as peeling and detachment due to aging effect are likely to occur from the external environment, and after the occurrence of problems such as peeling and detachment, the penetration of chlorine ions and the like is accelerated so that the corrosion rate is accelerated, Cause problems with A high land price situation.

In addition, acrylic or epoxy mortar has been problematic in that it is easy to remove after repairing, parts, peeling, etc. in wet environment.

In the case of the nitrite-based corrosion inhibitor, it is added to the mortar or directly applied to the reinforcing bar to suppress the corrosion of the reinforcing steel, but it is necessary to add the excessive amount of the reinforcing material to affect the initial characteristics of the mortar, One can not directly fix the chlorine ion, so that the passive film is broken and the corrosion is completely inhibited.

Accordingly, it is possible to maximize the maintenance effect on the deterioration area of the concrete, to rapidly regenerate the damaged part or the part where the damage is predicted, and at the same time to improve the durability and strength of the concrete structure, Is urgently needed.

The main object of the present invention is to maximize the maintenance effect on the deterioration area of concrete, to promptly restore the damaged area or the area where damage is predicted, and to prevent the penetration of water, thereby exhibiting excellent durability and strength The present invention relates to a mortar for recovering a section of a concrete structure.

Another object of the present invention is to provide a method for repairing a concrete structure that can fundamentally repair deterioration of concrete caused by multiple causes through respective steps.

In order to accomplish the above object, an embodiment of the present invention provides a method for producing a cement composition comprising 25 to 40 wt% of portland cement, 40 to 60 wt% of silica, 2 to 10 wt% of alumina cement, 1 to 5 wt% 1 to 5 wt% of functional admixture, 0.2 to 1 wt% of water reducing agent, 0.1 to 0.5 wt% of synthetic fiber, 0.5 to 2.5 wt% of sericite, 1 to 5 wt% of magnesium silicate, 0.2 to 1 wt% of silica fume, By weight based on the total weight of the mortar.

In one preferred embodiment of the present invention, the sericite has a hardness of 2 to 2.5 and a specific gravity (25 ° C) of 2.7 to 3.

In one preferred embodiment of the present invention, the magnesium silicate has a hardness of 1, a specific gravity (25 ° C) of 2.7 to 2.8, and a refractive index of 1.539 to 1.589.

Another embodiment of the present invention is a method of manufacturing a concrete structure, comprising: a surface treatment step of removing a foreign matter and a deteriorated part of a concrete structure; Applying a primer to the surface treated concrete structure; Applying a rust-inhibiting coating material to the exposed reinforcing bars of the surface-treated concrete structure; Applying the rutting coating material to the concrete structure to which the primer is applied; And a finishing step of finishing the concrete structure coated with the mortar with an anti-neutralization coating material.

In another preferred embodiment of the present invention, the primer is used in an amount of 0.1 to 5 parts by weight of a penetration electrodeposition agent, 0.1 to 5 parts by weight of silane, 1 to 10 parts by weight of a positive solvent and 10 to 25 parts by weight of water And the like.

In another preferred embodiment of the present invention, the anti-neutralization coating material may include a water-soluble styrene-acrylic resin and a water-soluble aliphatic urethane resin.

According to the present invention, it is possible to maximize the repairing effect on the deteriorated portion of concrete, to quickly restore the damaged portion or the portion expected to be damaged, and at the same time to prevent penetration of water and to exhibit excellent durability and strength The present invention can provide a mortar for recovering an end face having an end face and an end face restoring method using the same.

1 is a flow chart of a section repair method using a mortar for recovering a concrete structure according to the present invention.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In general, the nomenclature used herein is well known and commonly used in the art.

Throughout this specification, when an element is referred to as "including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise.

Throughout this specification, the term 'concrete structure' refers to a structure such as a chemical plant, a food factory, a related structure such as a floor of a house, a marine concrete structure, an architectural structure, a sewage terminal treatment plant, a swimming pool, an underwater concrete structure, It is used to refer to structures made of concrete, such as structures, sewer pipes, road surfaces, bridge bridges, concrete slabs of bridges, bridge expansion joints and precast products.

In one aspect of the present invention, there is provided a waterproofing composition comprising 25 to 40% by weight of portland cement, 40 to 60% by weight of silica sand, 2 to 10% by weight of alumina cement, 1 to 5% 0.2 to 1 wt% of synthetic fibers, 0.1 to 0.5 wt% of synthetic fibers, 0.5 to 2.5 wt% of sericite, 1 to 5 wt% of magnesium silicate, 0.2 to 1 wt% of silica fume and 1 to 5 wt% of slag The present invention relates to a mortar for single-sided recovery.

The mortar according to the present invention can contain the sericite and magnesium silicate having the optimum amount of flake structure to maximize the maintenance effect on the deterioration site of the concrete and quickly restore the damaged or predicted site At the same time, it is possible to prevent intrusion of water and to exhibit excellent durability and strength.

In the present invention, the portland cement is the main binder for the strength development of the mortar, and is used in an amount of 25 to 40% by weight based on the total weight of the mortar for section recovery. At this time, when the portland cement is used in an amount of less than 25 wt% based on the total weight of the single-sided mortar, the mortar strength can not be properly manifested, and when it exceeds 40 wt%, the adhesive strength is lowered.

In the present invention, silica sand has a hard density to reduce drying shrinkage that may occur during curing, and also to increase the rigidity of the mortar, and it is preferable to use 40 to 60% by weight based on the total weight of the cement mortar And the amount thereof used is a relatively fixed value depending on the amount of use of the other components.

The silica sand may be natural silica or pulverized synthetic silica, and the aggregate having an average diameter of 0.15 to 2.4 mm may be used by controlling the particle size thereof.

In the present invention, the alumina cement is as to the aluminum oxide and calcium-based material in an appropriate ratio to the fine grinding of the clinker thus obtained, after melting or sintering is made in the form of a powder, but not limited to those types in particular, alumina (Al ₂ O ₃₎ 50 ~ 70%, to use a silicon dioxide (SiO ₂₎ of alumina cement having 4 to 6%, iron oxide _{(Fe 2 O 3) 1 ~} 5 % by weight and calcium oxide (CaO) a composition of 30-40% oxide Which is preferable in terms of adhesive strength and strength.

The alumina cement functions as a binder for increasing the adhesive strength, and functions to adjust the characteristics such as rheology (flowability), hardening, early strength development and shrinkage of the mortar. The alumina cement accelerates the portland cement even at low temperatures, resulting in rapid strength development.

If the amount of the alumina cement is less than 2% by weight based on the total weight of the mortar to be recovered, the recovery strength of the single-sided mortar fails to exhibit sufficient mechanical properties. If the amount exceeds 10% by weight, And the shrinkage phenomenon, it is preferable to use it within the above range.

In the present invention, the water-dispersible powder resin is preferably used as a binder for adhesion with a concrete structure, prevention of penetration of water and harmful substances due to filling of voids, reduction in shrinkage, mechanical resistance against abrasion and impact, And a viscosity-imparting function for preventing separation. Ethylene vinyl acetate, styrene butadiene rubber, acrylic, and the like can be used.

When the weight of the water-dispersible powder resin is less than the weight range, the characteristics are insufficient. If the weight of the water-dispersible powder resin is more than the above range, it is preferable to use the cement particles in an appropriate range .

In the present invention, the functional admixture is usually used as a retarding agent, an accelerator, a thickener, a defoaming agent, and other mineral admixtures, and is commonly known to be associated with workability at the time of construction such as control of pot life, development of proper viscosity, reduction of air volume, Is used in the weight range described above.

In the present invention, the water reducing agent is called a dispersing agent, a fluidizing agent, etc., and a polycarbonate-based, melamine-based, naphthalene-based or the like is used and the water-cement ratio is lowered under the same working condition to form a closed structure, .

Since the water reducing agent is coated on the surface of the raw material to give an electrochemical repulsive force, it is preferable to use the water reducing agent in an amount of 0.2 to 1% by weight based on the total weight of the mortar to be recovered, .

In the present invention, the synthetic fiber is intended to improve the flexural strength, and it is intended to increase the tensile stress at the time of plastic shrinkage and shrinkage, thereby imparting crack resistance which can be generated in the long-term age, .

As the synthetic fibers, polyvinyl alcohol type, acrylic type and nylon type having hydrophilic properties are used. In this case, it is preferable to use 0.1 to 0.5% by weight of the synthetic fibers, and when it is used less than 0.1% There is a problem that the effect can not be seen, and when it is used in excess of 0.5% by weight, spraying due to lumps may not be performed well, so it is preferable to use within the above range. It is preferable that the synthetic fibers have a length of 4 to 8 mm in terms of improving the flexural strength of the mortar.

In the present invention, the sericite mineral is a silicate mineral having a very thin flaky structure with a white color. In the present invention, the flaky structure in the shape prevents the penetration of water by blocking the capillary, and the silicate material in the structure has excellent durability.

In particular, the sericite is fine in mica and has good characteristics such as denseness of texture and deodorizing power, and it is possible to obtain an effect of preventing shrinkage and preventing cracks, and alleviating the odor of the workplace, thereby improving workability.

In addition, since the sericite has a hardness of 2 to 2.5 and a specific gravity (25 ° C) of 2.7 to 3, it can serve as a void filler of a flake structure, thereby reducing the expansion and contraction of the mortar.

When the sericite is added in an amount of 2.5% by weight based on the total weight of the mortar for cross-section recovery, the specific gravity is low, which may result in deterioration of properties such as strength reduction by increasing the cement-water ratio. , The characteristic expression thereof may be insignificant.

Magnesium silicate also has a very thin flaky structure and has a smooth texture. It blocks the capillary due to the shape of the flake structure, preventing and blocking the penetration of water, and also has smooth texture and distinctive whiteness, And good durability, it is possible to exhibit properties such as water resistance, alkali resistance, workability, fluidity, shrinkage prevention and durability in the functional mortar.

In addition, the magnesium silicate has a low hardness, a hardness of 1, a specific gravity of 2.7 to 2.8, and a refractive index of 1.539 to 1.589, so that the particles are fine and dense to prevent shrinkage and prevent cracking.

In the present invention, by using magnesium silicate and sericite as a void filler having different dense flats, it is possible to effectively double penetration and shrinkage of moisture and harmful substances, improve strength and durability, The odor of the workplace can be alleviated by the deodorizing function of the work, and the workability can be improved.

At this time, when the magnesium silicate has a weight of less than the above-mentioned weight range, the characteristics of the magnesium silicate are insignificant. If the magnesium silicate exceeds the above range, the magnesium silicate may increase the cement-water ratio to lower the strength and durability. It is preferable to use it within the content range described above.

In the present invention, silica fume and slag are potential hydraulic substances which react with calcium hydroxide (Ca (OH) ₂ ), one of cement hydrate components, to form insoluble hydrate, and improve properties such as strength enhancement, chemical resistance and water tightness . This latent hydraulic material consumes calcium hydroxide, which is a soluble substance, to form an insoluble material. The insoluble material enhances the strength, thereby preventing the ingress of water by filling the capillary and enhancing the water resistance and chemical resistance by preventing the ingress of erosion material. I will.

Since the silica fume exhibits its characteristics at relatively early ages and the slag exhibits properties at long-term ages, it is preferable to use silica fume in combination with silica fume in combination with the slag, so that the silica fume is preferably used in the weight range described above.

In the case of repairing the concrete structure using the above-described single-sided repair mortar, it is possible to maximize the maintenance effect on the deteriorated portion of the concrete, to quickly restore the damaged portion or the portion expected to be damaged, Penetration can be prevented, and excellent durability and strength can be exhibited.

According to another aspect of the present invention, there is provided a method of manufacturing a concrete structure, comprising: a surface treatment step of removing a foreign matter and a deteriorated part of a concrete structure; Applying a primer to the surface treated concrete structure; Applying a rust-inhibiting coating material to the exposed reinforcing bars of the surface-treated concrete structure; A mortar applying step of applying the above-mentioned single-sided repair mortar to the concrete structure to which the primer is applied, after the step of applying the rust-preventive coating material; And a finishing step of finishing the concrete structure coated with the mortar with an anti-neutralization coating material.

As shown in FIG. 1, the section repair method of the concrete structure according to the present invention includes removing the deteriorated portion and foreign matter of the concrete structure (SSG-100), applying the primer to the surface treated concrete structure (SSG- (SSG-300), coated with the mortar of the present invention (SSG-400) on the surface of the concrete structure coated with the primer, and then subjected to finishing treatment with the anti-neutralization coating material (SSG-500).

The cross-section repair method of the concrete structure according to the present invention can prevent the penetration of water into the inside, obtain the effect of preventing weathering, durability and shrinkage by applying a silicate mineral having a flake structure to the mortar having a single- It is possible to exhibit excellent strength without use of asbestos and to maximize the maintenance effect on the deterioration area of concrete.

In addition, the section repair method of the concrete structure according to the present invention can fundamentally repair deterioration of concrete caused by multiple causes through each step.

The surface treatment step (SSG-100) is a step of removing the coating material from the surface concrete, coarse aggregate, exposure, greenery, excavation site and corrosion caused by aging phenomenon such as salinization, neutralization (carbonation) The surface of the deteriorated concrete is completely removed using a tool such as a grinder, and the surface of the chipped structure is completely removed using a high-pressure scrubber of 100 to 200 kg / m ² .

The primer application step (SSG-200) is a step for increasing the adhesive strength of the concrete surface due to the neutralized concrete and restoring the alkali of the concrete in order to prevent the progress of corrosion of the reinforcing steel. Is used to apply an alkyl recovery primer.

That is, as the concrete is neutralized by carbonation, the passive film of the reinforcing bar is destroyed and corrosion occurs. Therefore, the neutralized concrete should be restored to alkali in order to prevent further rebar corrosion.

In the present invention, any alkali recovery primer known as a primer can be used without limitation. However, from the viewpoint of permeability and reactivity of the concrete structure, 0.1 to 5 parts by weight of the penetration electrodeposition agent, 0.1 to 5 parts by weight of silane , 1 to 10 parts by weight of a positive solvent and 10 to 25 parts by weight of water may be used. In this case, the penetration electrodeposition agent may be a nonionic polyethylene oxide compound.

The alkaline restoration primer according to the present invention is excellent in permeability and reactivity by containing water-soluble styrene acrylic resin, penetration electrodeposition agent, silane, amphoteric solvent and water in a specific amount, thereby exhibiting high adhesive strength with concrete, So that the strength of the heat screen of the concrete structure can be restored.

The step of applying the anticorrosive coating material (SSG-300) is a step for preventing the corrosion of the exposed reinforcing bars. Corrosion of reinforcing steel causes fracture of concrete due to volume expansion. Therefore, a rustproof coating material for protecting the reinforcing bar is important, and various types of reinforcing bar coating materials can be used.

In the present invention, a nitrite-based rust-inhibitive coating material and a phosphate-based rust-inhibitive coating material may be used as a rust-inhibitive coating material, but it is preferable to use a phosphate-based rust-inhibitive coating material which forms a strong complex with a polyvalent metal ion in cement while having low biological toxicity.

The phosphate-based rust-inhibiting coating material reacts with phosphate to form insoluble iron phosphate, which forms a passive coating on the reinforcing bar to prevent corrosion, and a cement product is coated on the reinforcing bar coated with a phosphate- When poured, it forms a strong complex salt that reacts with polyvalent cations such as calcium, magnesium and aluminum ions in the cement to integrate with the cement hydrate, thereby enhancing the integration of the concrete and the reinforcing bars.

The phosphate-based rust-inhibiting coating material may include zinc phosphate, manganese phosphate, ferrous phosphate, free phosphoric acid, and accelerator.

Such a rust-inhibiting coating material is applied to the surface of the reinforcing bar with a uniform thickness by a known method such as a paint brush or a spray gun on the surface of the reinforcing bar after the rust of the exposed reinforcing bar is completely treated.

The mortar applying step (SSG-400) is a method of recovering the cross-section of the concrete structure by applying the above-mentioned mortar for cross-sectional restoration to the concrete structure coated with the permeable primer, By applying the mortar for repairing the section according to the present invention, it is possible to maximize the maintenance effect on the deteriorated portion of the concrete and to quickly regenerate the damaged portion or the portion expected to be damaged , It is possible to prevent penetration of water into the interior, thereby exhibiting excellent durability and strength.

At this time, the method of applying the above-mentioned section-restoring mortar may be any method known in the art, such as sprinkling and hand finishing, and it is preferable to repair the section with a thickness of 10 to 30 mm.

In the finishing step (SSG-500), an anti-neutralization coating material is applied on a mortar-coated concrete using a brush for a roller or a paint application, an air stray gun, etc., and a corner or corner portion is first coated with a brush, It is preferable that the large surface is uniformly applied as a whole by using a roller or a spray.

The anti-neutralization coating material may be any ordinary anti-neutralization coating material used for repairing an end face of a concrete structure. However, water-soluble styrene-acrylic resin and water-soluble aliphatic urethane resin may be used in order to have better properties in water resistance and weather resistance than conventional water- .

The water-soluble styrene-acrylic resin may be a resin having a solid content of 47 to 49 wt%, a viscosity (25 ° C) of 200 to 500 cps, a pH of 8 to 10, and a glass transition temperature (Tg) A resin having a solid content of 33 to 35 wt%, a viscosity (25 DEG C) of 100 to 300 cps, a pH of 8 to 8.5, and a specific gravity (25 DEG C) of 1.11 to 1.17 can be used.

As a preferred example, the anti-neutralization coating material according to the present invention comprises 15 to 25% by weight of water, 1 to 5% by weight of a dispersant, 0.1 to 1% by weight of a disintegrant, 0.1 to 1% by weight of an antifoamer, 0.1 to 1% The water-soluble styrene-acrylic resin is contained in an amount of 20 to 30% by weight, the extender pigment is 10 to 15% by weight, the water-soluble styrene acrylic resin is 25 to 35% by weight and the water-soluble aliphatic urethane resin is 10 to 15% It is preferable from the viewpoint of weather resistance.

 Water is used to facilitate the control of the viscosity of the coating material and to ensure a uniform coating. When the content exceeds 25% by weight, water causes the loss of function of the coating material. In the case of the dispersant for imparting the dispersing effect of each raw material, The effect of improving the dispersibility is not exhibited at the time of exceeding the content, and the antifoaming agent is also out of the range, so that the bubbling effect is not exhibited at the time of use. Also, in the case of the thickener for setting the viscosity of the coating material and preventing the flow, the workability is deteriorated by the high viscosity in the case of the content exceeding the range. In the case of the water-soluble styrene acrylic copolymer for imparting the coating strength to the coating material, Can be degraded.

When the water-soluble aliphatic urethane resin for imparting ductility is contained in an amount exceeding 15% by weight, the strength of the coating film may be weakened, and a coloring pigment for imparting hiding power may cause cracking in the case of excessive addition. The anti-neutralization coating material protects the surface of the concrete structure and prevents harmful substances such as water, carbon dioxide, chlorine, and sulfate from entering from the outside.

The present invention provides a method for repairing a concrete structure, which is capable of maximizing the repairing effect on a deteriorated portion of a concrete structure, quickly regenerating a damaged portion or a portion expected to be damaged, Durability and strength can be exhibited.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited by these Examples.

< Example  1 to 3 and Comparative Example  1 and 5>

The detailed components and contents of the mortar of Examples 1 to 3 and Comparative Examples 1 and 5 of the present invention were compounded as shown in Table 1, and the content of each component was expressed as% by weight.

ingredient Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Portland cement Hanil Cement, Type 1 Ordinary Portland Cement 35 35 35 35 35 35 35 35 Silica sand Divergent construction material, silica sand 7 47.7 50.2 44.2 51.7 46.2 50.2 51.1 43.2 Alumina cement Union, KSL-5205 (three kinds) 5 5 5 5 5 5 5 5 Water-dispersible powder resin Ethylene vinyl acetate, Chemius Korea (EVA powder) 3 3 3 3 3 3 3 3 Functional Admixture sodium gluconate, Chemius Korea 2.1 2.1 2.1 2.1 2.1 2.1 2.1 2.1 Water reducing agent Melamine series, Chemius Korea 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Synthetic fiber Chemicon: Polyacrylonitrile (PAN) 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Sericite Samgyeong MSM, sericite # 200
(Hardness: 2.5, specific gravity (25 캜): 2.9) 1.5 0.5 2.5 - 3.0 1.5 0.1 3.0 Magnesium silicate Gyeonggi Business, Taluk # 325
(Hardness: 1, specific gravity (25 占 폚): 2.7, refractive index: 1.550) 2.5 One 5 - 2.5 - 0.5 5.5 Silica fume Chemius Korea Co., Ltd. 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Slag Chemical Co., Ltd., slag powder 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0

The physical and chemical properties of the mortar obtained in Examples and Comparative Examples were measured according to the quality standard test method of KSF 4042 'concrete mortar for repairing concrete structures'. The results are shown in Table 2.

division Quality standards Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Physical property Bending strength (N / mm ² ) 6.0 or higher 10.9 10.8 12.1 7.3 7.1 7.4 7.8 8.3 Compressive strength (N / mm ² ) 20.0 or higher 55.8 54.5 56.1 48.1 49.2 48.5 49.2 51.4 Bond strength (standard condition N / mm ² ) 1.0 or higher 2.8 2.7 2.6 2.1 2.2 2.1 2.3 2.2 Length change rate (%) Within ± 0.15 0.010 0.020 0.015 0.030 0.020 0.030 0.030 0.020 Chemical properties Alkali resistance (compressive strength, N / mm ² ) 20.0 or higher 59.2 58.1 57.3 48.8 49.1 49.3 51.1 56.2 Neutralization resistance (mm) 2.0 or less 0.15 0.20 0.15 0.45 0.40 0.55 0.50 0.45 Permeability (g) 20.0 or less 2.1 2.3 2.0 3.4 3.3 3.5 3.4 3.2 Moisture permeation resistance (Sd) 2m or less 0.1 0.1 0.1 0.4 0.4 0.3 0.3 0.2 Chloride ion penetration resistance (Coulombs) 1,000 or less 215 223 245 312 315 311 293 285

As shown in Table 2, in the case of Example 1, a combination of 1.5% by weight of the sericite and 2.5% by weight of the magnesium silicate was used, and the overall physical properties were superior to the standard values.

In the case of Example 2, the amount of the rhizome was reduced by 0.5 weight%, the amount of magnesium silicate was decreased by 1.0 weight%, and the amount of the amount of magnesium silicate was reduced by an amount equivalent to the reduced amount of silica in the formulation of Example 1. As a result, , But the chemical properties were slightly lowered in some cases than in Example 1.

In the case of Example 3, the amount of the rhizome was increased by 2.5% by weight in the formulation of Example 1, the amount of magnesium silicate was increased by 5.0% by weight, , But the chemical characteristics were slightly lowered in comparison with Example 1 in some cases.

In Comparative Example 1, the sericite and magnesium silicate were removed from the mixture under the conditions of Example 1, and then silica sand was added in an amount equivalent to the removed amount. The measurement results showed that the physical properties and chemical properties of the result were significantly lower than those of Example 1, indicating that water and ionic materials penetrated into the pores of the mortar more than in Example 1 Is interpreted.

In Comparative Example 2, the amount of the sericite was increased to 3.0 wt% in the mixing condition of Example 1, and then the amount of the increased amount was measured by reducing the amount of silkworm.

Respectively. The measurement results showed that the physical properties and chemical properties of the result were significantly lower than those of Example 1, indicating that water and ionic materials penetrated into the pores of the mortar more than in Example 1 Is interpreted.

In Comparative Example 3, the amount of the montmorillon was 1.5% by weight and the magnesium silicate was removed, and then the amount of removed was replaced by silica sand. The measurement results showed that the physical properties and chemical properties of the result were significantly lower than those of Example 1, indicating that water and ionic materials penetrated into the pores of the mortar more than in Example 1 Is interpreted.

In Comparative Example 4, the amount of the montmorillon was reduced by 0.1 wt%, the amount of magnesium silicate was reduced by 0.5 wt%, and the amount of the amount of magnesium silicate was reduced by an amount equivalent to the reduced amount. The experimental results showed that the physical properties and chemical properties of the result were significantly lower than those of Example 1, indicating that water and ionic materials were more penetrated into the voids of the mortar than Example 1 Is interpreted.

In Comparative Example 5, the amount of the montmorillon was increased by 3.0% by weight, the amount of magnesium silicate was increased by 5.5% by weight, and the amount of the increased amount of the amount of magnesium silicate was measured. The measurement results showed that the physical properties and chemical properties of the result were significantly lower than those of Example 1. This is because the cement-water ratio was increased as compared with Example 1 and the void filling effect and strength enhancement effect were insufficient Is interpreted.

< Example  4>

The anti-neutralization coating agent of the present invention is prepared by the ingredients and contents shown in Table 3 below, and the manufacturing method is as follows.

To prepare the anti-neutralization coating agent of the present invention, water was first added to the vessel, and the ammonium carboxylate dispersant, antifungal agent, and modified silicone antifoam agent were added in this order and mixed at low speed stirring (500 rpm) A coloring pigment, and an extender pigment were put in this order, followed by stirring at a high speed (1500 rpm) for 20 minutes. After confirming the degree of softening (NS 4 or more), a water-soluble styrene-acrylic resin and a water-soluble aliphatic urethane resin were sequentially added thereto, and the mixture was stirred at 900 rpm for 20 minutes to bubble out the bubbles.

The color of the prepared anti-neutralization coating agent was white, the viscosity was 88 ± 2 ku (25 ° C.), the specific gravity was 1.377 ± 0.5 (25 ° C.) and the softness (NS) was 4 or more.

When the order of addition is changed, it may be unstable in storage stability due to lowering of dispersibility and the like, and physical properties of the coating film may be poor, so that it is preferable to prepare a coating agent for anti-neutralization according to the procedure described.

ingredient Content (% by weight) water 17.3 Ammonium carboxylate dispersant SN-Dispersant 5029 (Sanofuco) 3.3 Antifungal agent SunBio BT-950
(Yoo, Chang Efushi) 0.2 Modified silicone defoamer Sn-Defoamer 399 (Sanofuco) 0.2 Modified silicate-based thickener Bentone LT 0.3 Colored pigment (white) Titanium dioxide
(DuPont TiO ₂ R-902) 24 Extender pigment Magnesium silicate
(Gyeonggi Unemployment SKT-400) 13.2 Water-soluble styrene acrylic resin Solid content 47 wt%, viscosity (25 DEG C) 200 cps, pH 8, Tg (DEG C) 12
(Korea Polymer, KopLex PA-794) 30 Water-soluble aliphatic urethane resin Solid content 34 wt%, viscosity (25 캜) 200 cps, pH 8, specific gravity 1.11
(Conjugated polymer UE-2861) 11.5

< Example  5>

A 50 mm x 50 mm x 50 mm cement mortar specimen was placed in a neutralization accelerated tester to forcibly carbonate the specimen and the carbonized specimens were fully coated with the primer and cured for 3 hours. After the application, the anti-neutralization coating material of Example 4 was applied twice. At this time, the primers were prepared by the ingredients and contents shown in Table 4 below.

In order to prepare the permeable primer of the present invention, water and an infiltration electrodeposition agent were put into a container, and a small amount of positive solvent and silane were added to the container with low speed stirring (500 rpm) for about 5 minutes each time, And the transparent state was confirmed. Then, water-soluble styrene-acrylic resin was added thereto, and the mixture was stirred at about 900 rpm for about 10 minutes to prepare a homogeneous liquid. The mixture was stirred at a low speed while adding antifungal agent and antifoaming agent. The mixture was stirred at low speed for 5 minutes, .

The permeability primer prepared was light milky white with specific gravity (25 ° C) of 1.00 ± 0.05, viscosity (Ford Cup # 4, 25 ° C) of 14 ± 2 sec and pH of 11.

ingredient Content (% by weight) water 15.5 Penetration electrodeposit Polyoxyethylene nonylphenyl ether (Southeast synthesis, M-OP1019)
[Specific gravity (20 ° C): 1.07 g / cm ³ , HLB: 13.2, EO number of moles: 9, viscosity (20 ° C): 240 cp] 1.5 Positive solvent Isopropyl alcohol, isochemical 3.0 Silane Aminopropyltriethoxysilane (KCC, SB1013E APTES)
(Refractive index: 1.423, specific gravity (25 占 폚): 0.946, molecular weight (Mw, g / mol): 221.37, flash point: 96 占 폚, viscosity (25 占 폚) 1.2 Water-soluble styrene acrylic resin Korea Polymer, KopLex Pa-794 78.3 Antifungal agent Sun Bio BT-950 0.2 Defoamer Sn-De foamer 399 0.3

The physical and chemical tests of the anti-neutralization coating material were carried out in accordance with KSF 4936 'Coating material for concrete protection' in Table 5 below as a result of the physical and chemical tests of the anti-neutralization coating materials according to Examples 4 and 5. The anti-neutralization coating material was applied twice. The thickness of the coating material applied twice was 100 mu m on average. The adhesion strength of Example 4 was normal concrete, and the adhesion strength of Example 5 was 50% The test specimens were prepared and cured using mortar for section repair.

division result Quality standard (KSF 4936) Example 4 Example 5 Appearance after film formation After standard curing clear - Wrinkles, cracks, pinholes, deformation and peeling should not occur After accelerated weathering test clear - After repeated cold and cold tests clear - After alkali resistance test clear - After the salt water resistance test clear - Neutralization length (mm) 0 - 1.0 or less Chloride ion penetration resistance (Coulombs)
2.5 - 1000 or less Permeability 0 - Not to pitch Bond strength (N / mm ² )
After standard curing 2.6 3.3 1.0 or higher After accelerated weathering test 2.5 3.2 After repeated cold and cold tests 2.4 3.1 After alkali resistance test 2.5 3.1 After the salt water resistance test 2.4 3.1 Crack Resistance -20 ° C clear - Jag and break
Not to be 20 ℃ clear - After accelerated weathering test clear -

As shown in Table 5, Examples 4 and 5 exhibited satisfactory properties in all the test items. Particularly, when the mortar of the present invention was used, the adhesion strength was higher than that of a plain concrete base in all conditions Respectively.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, those skilled in the art will appreciate that such specific embodiments are merely preferred embodiments and that the scope of the present invention is not limited thereto will be.

Claims (6)

delete delete delete A surface treatment step of removing foreign matter and deteriorated portions of the concrete structure;
0.1 to 5 parts by weight of an impregnation electrodeposition agent, 0.1 to 5 parts by weight of silane, 1 to 10 parts by weight of isopropyl alcohol and 10 to 25 parts by weight of water, based on 100 parts by weight of water-soluble styrene acrylic resin, in the surface treated concrete structure A primer applying step of applying the primer characterized in;
Applying a rust-inhibiting coating material to the exposed reinforcing bars of the surface-treated concrete structure;
Applying mortar to the concrete structure to which the primer is applied, after the step of applying the rustproofing coating material; And
And a finishing treatment step of finishing the concrete structure coated with the mortar with an anti-neutralization coating material containing a water-soluble styrene-acrylic resin and a water-soluble aliphatic urethane resin, wherein the mortar for cross- 25 to 40% by weight of silica sand, 40 to 60% by weight of silica sand, 2 to 10% by weight of alumina cement, 1 to 5% by weight of water dispersible powder resin, 1 to 5% by weight of functional admixture, 0.2 to 1% 0.5 to 2.5% by weight of a sericite having a flat structure and having a specific gravity of 2 to 2.5 and a specific gravity (25 캜) of 2.7 to 3, Wherein the magnesium silicate has a hardness of 1, and the magnesium silicate has a hardness of 1 to 5% by weight, silica fume of 0.2 to 1% by weight and slag of 1 to 5% by weight, wherein the magnesium silicate has a hardness of 1 , Recovery section of a concrete method of claim. delete delete

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