KR20060086901A - The treatment composition manufacture method for repair system to protect deterioration of concrete structures from carbonation and chloride attack using a water-soluable epoxy mortar coated by a soft acrylic resin and the repair construction - Google Patents

Abstract

The present invention is directly exposed to various deterioration environments such as carbon dioxide, chloride ions, sulfate environment and acid rain and acid soil, as well as repair of the durability degradation site of the concrete section due to deterioration factors such as neutralization and salt damage that occur frequently in concrete structures. Manufacturing method of treatment agent for recovery and maintenance of durability performance of concrete structure using mortar containing water-soluble epoxy with protective film made of water-soluble acrylic soft resin to prevent degradation of durability of various newly constructed concrete structures beforehand and repairing method using the same The present invention relates to a soft water-soluble acrylic resin having a high water resistance to a water-soluble epoxy having a fine water molecular composition of 1 µm or less that is excellent in breathability, water permeability, and strength in the most stable conventional (water-soluble epoxy 7: water-soluble acrylic 3) mixing ratio. By forming the protective film is characterized in that given a flexible epoxy and environmental friendliness by configuring the base resin, the curing agent, a method of polymerizing a high molecular weight elastic material in and incidental to the combination of the filler treating agent and a method for producing the compensation method has a hydrophilic group.

Concrete Structure, Durability, Section Repair, Section Recovery, Neutralization, Salt, Water Soluble Epoxy, Oily Epoxy, Acrylic Soft Resin, Protective Film

Description

The treatment composition manufacture method for repair system to protect deterioration of concrete structures from carbonation and cross-sectional repair and neutralization of concrete structures using mortar containing water-soluble epoxy with protective coating made of acrylic soft resin Chloride Attack using a water-soluable epoxy mortar coated by a soft acrylic resin and the repair construction}

1 is a conceptual view of the construction of the cross-sectional recovery method for a structure that is deteriorated by neutralization and salt damage in excess of the cross-sectional defects or rebar depth in accordance with the present invention.

Figure 2 is a conceptual view of the construction of the surface repair method when the deterioration progressed by the neutralization and salt, but does not reach the reinforcing bar depth.

Figure 3 is a conceptual view of the construction of the construction method of preventing deterioration of a new concrete structure is expected to degrade performance due to various durability deterioration factors such as neutralization and salt.

※ Explanation of code for main part of drawing

101: temporary concrete structure 102; 202; 302: rebar

103: outdoor exposure surface 104: cutting surface

105: exposed rebar 106: rustproof epoxy primer coating layer

107: impregnated water-based modified epoxy primer coating layer for surface strengthening

108: water-based acrylic modified epoxy resin mortar cross-sectional recovery material

109: surface layer

201: Concrete structures with cross section deterioration due to neutralization and salt damage

203: deterioration chucking high pressure washing unit

204: impermeable water system modified epoxy primer coating layer

205: neutralization and salt prevention layer

301: new concrete structure

303: New structure surface high pressure washing unit

304: permeable surface strengthening primer coating layer

305: neutralization and salt prevention layer

The present invention relates to a cross-sectional repair and neutralization of concrete structures using a mortar containing a water-soluble epoxy with a protective film formed of an acrylic soft resin, and a method for preparing a treatment agent for preventing salts and a repairing method thereof.

In general, it is constructed by direct exposure to various deteriorating environments such as carbon dioxide, chloride ions, sulphate environment and acid rain and acid soil, as well as repair of the durability degradation part of concrete section due to deterioration factors such as neutralization and salt damage that occur frequently in concrete structures. Acrylic soft resin containing water-soluble epoxy with protective coating to prevent degradation of durability of new concrete structures such as bridges, tunnels, various marine and coastal (adjacent) structures, agricultural water and industrial water structures, and building structures. The present invention relates to a treatment composition for repairing and maintaining the durability of concrete structures using mortar and a repair method thereof.

Carbonation of concrete structures is essentially a cement gel in concrete as carbon dioxide or moisture in the air penetrates into the capillary pores of concrete to react with calcium hydroxide, which is strongly alkaline (pH = 12-13), to produce calcium carbonate. Due to decomposition.

 As a result of this phenomenon, a passivation film having a thickness of about 20-60Å is formed and stabilized in a strong alkaline environment, and the corrosion of the reinforcing bar and induction of volume expansion cause concrete damage to the cross section.

In addition, the chloride attack of concrete structures due to the effect of chloride or calcium chloride for snow removal, which is essentially contained in the constituent materials during the concrete mixing, and non-salative salts on the surface of concrete structures observed at sea or near the shore, Reinforcement inside the concrete is locally corroded by a certain amount of chloride ions penetrated into the ball.

As a result, damage to the concrete cross section is caused by high expansion pressure, and since it is difficult to have a constant amount of salinity throughout the reinforcing bar surface, a potential difference occurs and the reinforcing corrosion is further activated by electrochemical reaction on the reinforcing bar surface along with electron flow. This results in a threat to safety as well as overall durability.

Concrete structures undergo shrinkage and expansion according to the change of the surrounding environment, and in case of excessive tensile stress exceeding tensile strength, structural strength such as cracking, surface peeling, and local dropping, etc. Triggered.

These factors provide a penetration path for moisture, oxygen and carbon dioxide, chloride ions, etc. present in the atmosphere, and as described above, are subjected to internal corrosion of concrete and neutralization and salt from the surface.

Epoxy-based, acrylic rubber-based and cement-based mineral-based materials have been widely used for repairing and repairing sections due to defects and damages such as neutralization, salting, cracking, peeling and dropping, etc. Among them, epoxy-based and acrylic rubber-based materials are organic materials and have excellent initial adhesive strength, but when exposed to wet environment frequently in the copolymerization of acidic acryl and hydrophilic alkaline ammonia water, the polymer ring is separated by external moisture particles in the long term. The problem of lowering the adhesive strength has been pointed out by the peeling of, and the problem of yellowing due to long term exposure to ultraviolet rays has been pointed out in the case of the conventional epoxy type.

In addition, due to the characteristics of the existing materials manufactured by the forced emulsification method by adding an emulsifier to the oil-based epoxy resin, separation of the resin and water over time and rapid variation in adhesion due to the nonuniformity of the cells (bubbles) having a relatively large size, etc. The problem of occurrence is highlighted.

In addition, in the case of repair materials with strong initial adhesion, the flexibility is relatively low, so that the integrity of the structure can be easily achieved even at the microcracks due to the intrinsic length and volume changes that occur relatively early in the concrete structure. It is a situation that continues to emerge as a disadvantage that can not maintain durability as a repair material.

In view of the above, in the present invention, a material having excellent adhesion strength characteristics is widely known and widely applied, but lacks flexibility due to excessively high strength, deterioration of long-term adhesion strength due to micro deformation of concrete structures, and under ultraviolet environment. Acrylic that can solve problems such as yellowing and secure durability under general environment such as reinforcing corrosion or neutralization, as well as relatively special environment such as salt environment, highly corrosive environment (sulphate), acid soil, etc. The present invention provides a method for producing a neutralizing and salt-preventing treatment agent for concrete structures using a mortar containing a water-soluble epoxy having a water molecular composition of 1 μm or less and a protective film formed of a soft resin. There is.

In the present invention, in order to achieve the object of the present invention in consideration of the problems of the existing technology, the cross-sectional repair and neutralization and salting of concrete structures using a mortar containing a water-soluble epoxy formed with a protective film of the acrylic soft resin according to the present invention The prevention treatment agent manufacturing method is as follows.

Example 1

The main composition is 75 wt% to 85 wt% of water dispersible epoxy resin, 20 wt% to 30 wt% of water-soluble soft acrylic resin, 1 wt% to 2 wt% of antibacterial agent, and 0.3 wt% to 0.5 wt% of antifoaming agent. The first step to do;

A second step of forming the curing agent into 50 wt% to 60 wt% of water dispersible hardener, 30 wt% to 40 wt% of water, and 10 wt% to 20 wt% of silicate;

As a further admixture of the above-mentioned main material and the curing agent, 20 to 30% by weight of the cemented steel cement, 2 to 5% by weight of titanium pigment, 10 to 15% by weight of illite, and 0.2 to 0.5% by weight of copper powder A third step comprising 2 wt% to 5 wt% of silica gel, 2 wt% to 3 wt% of antioxidant, 0.2 wt% to 0.3 wt% of antioxidant, and 50 wt% to 60 wt% of silica sand 4-5;

Based on the total weight of 40kg by mixing the main body and the curing agent 20kg each, 40kg of water is added and diluted (topic + curing agent: water = 1: 1, weight ratio), and completely mixed for about 5 minutes to penetrate the water-based modified A fourth step of forming an epoxy primer;

On the other hand, the fifth step of forming a water-based acrylic-modified epoxy resin mortar by adding water in a ratio of 1: 2 to the weight of the mixing amount of the main material and the curing agent, and mixing the dry mortar in a ratio of 1: 9.5 to the amount of the charged amount;

Preparation of cross section repair, neutralization and salt prevention treatment of concrete structure using mortar containing water-soluble epoxy with protective film made of acrylic soft resin which is completed by mixing main material, curing agent, water and filler in the ratio of 1: 1: 3 to weight, respectively. A method is provided.

As described above, the water-soluble soft acrylic resin in the treatment agent constituting the main composition, the curing agent and the filler composition according to the present invention is characterized in that it provides a protective film formation of the water-soluble epoxy resin as well as a yellowing prevention role by maintaining the transparency of the resin material. Antimicrobial agent and copper powder to prevent interfacial oxidation and deterioration of interfacial adhesion due to condensation by organic acids due to bacteria and fungi that can grow at the interface with excellent breathability according to water molecular composition of less than 1㎛ There is a feature to provide.

In addition, by applying water as a solvent and providing excellent heat conductivity and far-infrared ray emission component (about 35% of the aluminum component), it is characterized in that it is environmentally friendly during construction in a confined space.

Next, the construction example of the cross-sectional repair and neutralization of the concrete structure using a mortar containing a water-soluble epoxy formed with a protective film with an acrylic soft resin of the present invention composed of a main agent, a curing agent and a filler, and a salt prevention repairing method is shown in the accompanying drawings. It demonstrates in detail using FIG. 2 and FIG.

Example 2

1 is a conceptual diagram illustrating the construction of a cross-sectional recovery method for a structure in which degradation due to neutralization and salt is exceeded due to cross-sectional defects (or damage) or rebar depth according to the present invention, and FIG. It is a conceptual diagram of the construction of the surface treatment method when it does not reach depth.

In addition, Figure 3 is a conceptual view of the construction method of preventing degradation of the new concrete structure is expected to deteriorate in the long term due to various degradation factors such as neutralization and salt damage.

According to FIG. 1 of the present invention, in the case where the overall or local deterioration of the cross section is developed to the depth of the reinforcing bar 102 in the concrete due to various deterioration factors occurring during the common period in the existing concrete structure 101,

A first step of cutting the degradation generation part of the external air exposure surface 103 of the existing concrete structure 101 to a predetermined depth d1 to form the cutting surface 104;

A second step of removing foreign matters by performing high pressure washing at a pressure of 750 bar or more on the formed concrete cutting surface;

At this time, the third step of performing a rust removal operation if the presence of the coating on the surface of the exposed rebar 105 by performing a high pressure wash on the surface of the exposed rebar 105;

After the pretreatment such as high pressure washing is completed, a conventional steel surface rust preventive epoxy primer (brown or gray) is applied to the surface of the exposed reinforcement 105 and the concrete cut surface surface 104 is applied in the fourth step of Example 1. A fourth step of forming a coating layer 107 with the permeable aqueous modified epoxy primer for surface strengthening;

By recovering the water-based acrylic modified epoxy resin mortar cross-sectional recovery material 108 formed in the fifth step of Example 1 twice, the recovery of the cut section is completed.

At this time, if the cross-sectional recovery depth exceeds 30mm, it may be applied three times, but in principle, the sequential method of constructing two-stage (or two-layer) construction within about 5-12 hours after the one-stage (or one-layer) construction In addition, it is desirable to make irregularities for easy adhesion during the next step construction by using a plastering brush at each step of construction.

In addition, if necessary, after the completion of the cross-sectional recovery process, the surface layer 109 is formed by including a surface treatment finish of mixing the main agent of 1 and the curing agent, water, and filler in a ratio of 1: 1: 3 to the weight, respectively. The process of the cross-sectional recovery method of the present invention may be finished.

Example 3

On the other hand, in the case of Figures 2 and 3, the construction of the cross-section repair process by the surface treatment for the concrete structure 201, the cross-sectional degradation caused by neutralization and salt damage and the construction of the cross-section degradation due to neutralization and degradation is likely to be built Will show the application process of the deterioration prevention method for the new concrete structure 301 to be respectively.

According to FIG. 2, durability deterioration occurred to a depth d2 due to various deterioration factors such as neutralization and salting according to safety inspection results of various concrete structures such as precision inspection and precision safety diagnosis during long-term use. For existing concrete in the state that the deterioration is not progressed up to the existing reinforcing bar 202

 A first step of removing the deterioration part and the foreign matter by one of the methods selected from the high pressure washing process 203 at a pressure of 750 bar or more, grinding, chipping, and the deterioration depth d2;

After the pretreatment up to the depth of deterioration (d2), 40 kg of water is added to the permeable water-based modified epoxy primer coating layer 204 based on the total weight of 40 kg based on the main body and the curing agent of 20 kg each. : A second step of diluting the water ratio 1: 1 by weight and thoroughly mixing for about 5 minutes;

After forming the surface strengthening layer 204 by the permeable water-based modified epoxy primer and finally stirring the water and filler in the ratio of 1: 1: 3 to the weight of the main body and the curing agent of the present invention so that the filler is completely mixed for about 5 minutes. Thus, the neutralization and salt prevention layer 205 is formed to finish the process of the cross-sectional repair (or surface treatment) process for neutralization and salt prevention for the surface deterioration portion of the present invention.

On the other hand, Figure 3 is a conceptual view of the construction method of preventing degradation of the new concrete structure is expected to deteriorate due to various durability deterioration factors such as neutralization and salt damage, when the process of Figure 2, based on the process of Figure 2, All processes except for the chipping process 203 are applied in the same manner, and are sequentially performed in the process of forming the high pressure washing 303 on the surface of the new structure, the penetrating surface strengthening primer coating layer 304 and the neutralization and salt prevention layer 305.

According to the present invention, in addition to providing salt resistance, anti-neutralization ability, chemical resistance, acid resistance, and excellent adhesion performance for concrete structures, polymerization rings in a wet environment exhibited in conventional acrylic resin materials by copolymerization of existing acrylic acid and hydrophilic ammonia water. It is expected that the degradation of the durability of concrete structures may be prevented by the acidic exposure of the repair material itself.

It is possible to solve problems such as cracking (or tearing) after hardening of water-retaining materials due to surface shrinkage observed in existing oil-based epoxy resin system by providing ductility while maintaining excellent strength characteristics by forming film of soft acrylic resin. It is expected to prevent condensation at the interface with the surface of concrete structures and to reduce the adhesion strength by ensuring excellent breathability by the composition of water molecules, and to prevent oxidation due to the release of organic acids due to the parasitics of microorganisms such as bacteria and fungi at the interface. It is expected to prevent oxidation at the surface and the concrete structure by providing the antimicrobial agent and the copper component. In particular, the protective coating using a small amount of soft acrylic resin is expected to provide long-term economic efficiency in terms of maintaining aesthetics and maintenance by greatly suppressing the yellowing phenomenon when exposed to the outside air generated from the existing oil-based epoxy materials.

In addition, it is possible to form mortar with excellent flowability by using a water-soluble epoxy containing a fine water molecular component rather than an oil-based epoxy, and water is used instead of organic solvents such as thinner as the solvent, and the aluminum component in the filler is about 35%. By adding the existing illite components, it is expected to provide excellent thermal conductivity and environment-friendliness due to far-infrared emission and to secure workers' stability in confined spaces.

Claims (4)

The main composition is 75 wt% to 85 wt% of water dispersible epoxy resin, 20 wt% to 30 wt% of water-soluble soft acrylic resin, 1 wt% to 2 wt% of antibacterial agent, and 0.3 wt% to 0.5 wt% of antifoaming agent. The first step to do; A second step of forming the curing agent into 50 wt% to 60 wt% of water dispersible hardener, 30 wt% to 40 wt% of water, and 10 wt% to 20 wt% of silicate; As a further admixture of the above-mentioned main material and the curing agent, 20 to 30% by weight of the cemented steel cement, 2 to 5% by weight of titanium pigment, 10 to 15% by weight of illite, and 0.2 to 0.5% by weight of copper powder A third step comprising 2 wt% to 5 wt% of silica gel, 2 wt% to 3 wt% of antioxidant, 0.2 wt% to 0.3 wt% of antioxidant, and 50 wt% to 60 wt% of silica sand 4-5; Based on the total weight of 40kg by mixing the main body and the curing agent 20kg each, 40kg of water is added and diluted (topic + curing agent: water = 1: 1, weight ratio), and completely mixed for about 5 minutes to penetrate the water-based modified A fourth step of forming an epoxy primer; On the other hand, the fifth step of forming a water-based acrylic-modified epoxy resin mortar by adding water in a ratio of 1: 2 to the weight of the mixing amount of the main material and the curing agent, and mixing the dry mortar in a ratio of 1: 9.5 to the amount of the charged amount; Cross section repair, neutralization and salting of concrete structures using a mortar containing water-soluble epoxy with a protective coating made of acrylic soft resin, which is completed by mixing the main material, the hardener, water, and filler in a ratio of 1: 1: 3 by weight, respectively. Method of manufacturing preventive treatment agent. In the existing concrete structure 101, when the overall or local deterioration of the cross section is developed to the depth of the reinforcing bar 102 in the concrete due to various deterioration factors occurring during the common period, A first step of cutting the degradation generation part of the external air exposure surface 103 of the existing concrete structure 101 to a predetermined depth d1 to form the cutting surface 104; A second step of removing foreign matters by performing high pressure washing at a pressure of 750 bar or more on the formed concrete cutting surface; At this time, the third step of performing a rust removal operation if the presence of the coating on the surface of the exposed rebar 105 by performing a high pressure wash on the surface of the exposed rebar 105; After the pretreatment such as high pressure washing is completed, a conventional steel antirust epoxy primer (brown or gray) is applied to the surface of the exposed reinforcement 105 and coated with a permeable aqueous modified epoxy primer on the surface of the concrete cut surface 104. 107) forming a fourth step; Sectional repair and neutralization of the water-based acrylic modified epoxy resin mortar cross-sectional recovery material (108) is usually completed twice, and neutralization and salt prevention repair method. According to the safety inspection results of various concrete structures such as precision inspection and precision safety diagnosis during long-term use, the deterioration of durability occurred to a depth d2 due to various deterioration factors such as neutralization and salt damage. For existing concrete in the state that the deterioration is not progressed up to the reinforcing bar 202 existing therein  A first step of removing the deterioration part and the foreign matter by one of the methods selected from the high pressure washing process 203 at a pressure of 750 bar or more, grinding, chipping, and the deterioration depth d2; After the pretreatment to the depth of deterioration (d2) is completed, 40 kg of water is added to the permeable water-based modified epoxy primer coating layer 204 based on a total amount of 40 kg of the main body and the curing agent of 20 kg each. Diluting the ratio to 1: 1 by weight and completely mixing for about 5 minutes, followed by construction; After forming the surface strengthening layer 204 by the permeable water-based modified epoxy primer and finally neutralized by stirring for about 5 minutes so that the filler is completely mixed with water and filler in the ratio of 1: 1: 3 to the weight and the main agent and the curing agent. Sectional repair and neutralization and salt prevention and repair method of the concrete structure, characterized in that completed by forming a salt prevention layer (205). The method of claim 3, wherein the surface of the new structure is the same in all processes except the deterioration part chipping process (203), High pressure washing (303); Forming a permeable surface strengthening primer coating layer 304; Deterioration prevention method of the new concrete structure, characterized in that the construction is completed by the process of neutralization and salt prevention layer (305).

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