KR101852333B1 - Repair method of crack in concrete - Google Patents

Abstract

The present invention relates to a method to repair a crack in a concrete structure with a painting function, comprising: a step of removing a foreign matter from a surface of a concrete structure; a step of filling and overlapping an acrylic high elasticity putty material on the surface of the concrete structure from which the foreign matter is removed; and a step of coating a putty composition mixing the acrylic high elasticity putty material and a first class coating composition on the surface of the concrete structure on which the acrylic high elasticity putty material is filled and overlapped. According to the present invention, the present invention has advantages of excellent workability, realizing beautiful appearance on a building which was on repair, and providing an excellent effect on repair of microcracks.

Description

REPAIR METHOD OF CRACK IN CONCRETE BACKGROUND OF THE INVENTION [0001]

More particularly, the present invention relates to a method of repairing cracks in a concrete structure having a painting function, and more particularly, to a method for repairing cracks in a concrete structure by mixing a first- And more particularly, to a method of repairing cracks in a concrete structure having a painting function.

Reinforced concrete is the most efficient building material made up of a combination of a compressive material called concrete and a tensile material called reinforcing steel. However, the reinforced concrete structure is constantly deformed due to changes in the external environment such as temperature change, harmful gas and vibration, It can not be permanently preserved through remuneration. That is, the reinforced concrete structure is exposed to various problems due to the concrete behavior and moisture inflow over time, which shortens the life span of the concrete structure.

Typical examples are rebar corrosion due to external cracks in the apartment and corrosion of the concrete due to carbon dioxide gas. First, the cracks are cracked by side branching, and rainwater is introduced into the reinforcing bars through the cracks to promote the corrosion of the reinforcing bars. When the corrosion of the reinforcing steel is corroded and expands, the part of the concrete covering thickness is broken, and the reinforcing steel inside is exposed, and the rainwater flowing through the cracks continues to move into the structure while corroding the reinforcing steel. Second, when the concrete comes into contact with carbon dioxide, the concrete that changes into calcium carbonate and water becomes neutralized (aging) phenomenon. This causes the structural users to feel the risk of the stability of the structure, which in fact seriously hinders the stability of the structure.

Also, there is a high possibility of leaking through balcony cracks, roof railing, window frames exposed around the openings, roof bits, and micro cracks around the structure. The possibility of such leakage occurs through cracks after construction, cold joints generated when concrete is poured, or pores separated by material. In addition, cold air is introduced into the generation through fine cracks, and moisture mold .

In order to solve this problem, periodic maintenance method is needed to solve this problem. Since it is necessary to maintain the apartment building for a long time in a safe and safe state without leaking, If maintenance levels are not improved according to the later years and years, there will be difficult maintenance situations.

For maintenance, concrete structures such as apartments or apartments repair external cracks over a period of time, and known repair methods include coating repair methods, filling repair methods, injection repair methods, structural reinforcement methods .

The coating-type repair method is a repair method in which a coating is applied to a minute crack by using a crack repair material. In a filling repair method, a V-cut and a U-cut are performed to secure an adhesion area between a crack repair material and an existing matrix, Repair method filling the repair material. The injection repair method is solved by transverse crack which is caused by large crack (crack width of 1mm or more) caused by penetrating through the structure of the main structure, transverse crack which is a threat to the safety of the structure, It is a maintenance method that is applied to leakage cracks and other unintended applications. On the other hand, the structural reinforcement method is usually regarded as a maintenance method related to the stability of the structure, so safety diagnosis and reinforcement design must be accompanied.

Among them, the coating-type repair method has heretofore been used as a method of applying the surface of concrete using a highly elastic putty material. However, such a work of putty material conventionally requires reduction of a section where a crack is overlapped in a curing process, so that three or more consecutive operations are required. In addition, such putty material is blended with appearance of oil, , The internal putty mark was visible even when the exterior was applied by using the adhesive.

KR 10-1744500 B1 KR 10-0964064 B1 KR 10-0767736 B1 KR 10-1087700 B1 KR 10-0628949 B1

Accordingly, an object of the present invention is to solve the troublesome work of applying a separate exterior paint at the time of construction of a conventional high-elasticity putty material by mixing an acrylic high-elasticity putty material and a first level paint, The present invention also provides a method of repairing cracks in a concrete having a painting function that not only removes the gloss and putty marks caused by oil fractions but also makes the appearance of a repaired concrete building more beautiful.

Another object of the present invention is to provide a method for repairing cracks in a concrete having a painting function that is more effective for repairing fine cracks, as compared with a conventional method of applying only a highly elastic putty material.

According to another aspect of the present invention, there is provided a method of repairing cracks, comprising the steps of: removing foreign matter on a surface of a concrete structure; filling and overlapping an acrylic high elasticity putty material on a surface of the concrete structure from which the foreign matter has been removed; And coating the putty composition obtained by mixing the acrylic high-elasticity putty material and the first-level paint composition on the surface of the concrete structure which is filled and overlapped with the high-elasticity putty material.

The putty composition is characterized in that 50 to 70% by weight of the acrylic high elastic putty material is mixed with 30 to 50% by weight of the first grade paint composition.

The acrylic high elasticity putty material may be selected from the group consisting of 1 to 1.5% by weight of titanium oxide, 1 to 3% by weight of trimethyl-2,4-pentanediol-1,3-isobutylate, 1 to 3% by weight of ethylene glycol, 30 to 40% by weight of calcium carbonate, 40 to 50% by weight, and the balance water.

The first grade coating composition comprises 5 to 10 wt% of pigment, 10 to 15 wt% of titanium dioxide, 15 to 20 wt% of calcium carbonate, 40 to 50 wt% of a resin binder, 5 to 10 wt% of a polyhydric alcohol, 0.5 to 1% by weight of an antifoaming agent, 0.5 to 1% by weight of a thickener, and the balance water.

Applying a rust preventive agent containing 70 to 80% by weight of ethylene glycol and 20 to 30% by weight of a polyolefin resin to the cracked portion of the surface of the concrete structure from which the foreign matter has been removed; A second mixture 86 to 40 weight% of silica, 12 to 13 weight% of cement and 12 to 13 weight% of cement, to 10 to 14 weight% of a first mixture consisting of 48 to 52 weight% And 90% by weight of the mortar.

And a step of charging and overlapping the acrylic high-elasticity putty material with the acrylic high-elasticity putty material in the step of filling and overlapping the acrylic type high-elasticity putty material on the surface of the concrete structure from which the foreign matter has been removed.

According to the crack repairing method of a concrete having a painting function according to the present invention, it is advantageous in that the work efficiency is excellent, the appearance of a cracked and repaired building is improved, and an excellent effect is obtained in repairing micro cracks.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a procedure of a crack repairing method according to the present invention; FIG.

Hereinafter, the present invention will be described in detail.

The present invention is intended to solve the problem that a putty mark remains on the surface, which is a problem that occurs when using a high-elasticity putty material, and that microcracks can not be completely covered even in a plurality of operations.

A method of repairing cracks according to the present invention comprises the steps of removing foreign matter on the surface of a concrete structure, filling and overlapping acrylic high-elasticity putty material on the surface of the concrete structure from which the foreign matter has been removed, And coating the putty composition obtained by mixing the acrylic high-elasticity putty material and the first grade paint composition on the surface of the overlapped concrete structure.

Removing the foreign matter on the surface of the concrete structure.

First, the foreign matter on the surface of the concrete structure is removed.

The removal process of foreign matter is performed according to a crack repairing method of a conventionally known structure to remove a portion of the surface of the concrete which is puffed and protruded due to the poor coating and the corrosion of the steel bar and to remove foreign substances on the surface thereof to facilitate post- .

On the surface of the concrete structure from which the foreign matter has been removed Acrylic high elasticity Putty ash  Charging and overlapping steps.

Next, the acrylic high elastic putty material is filled and overlapped on the surface of the concrete structure from which the foreign matter is removed by using rubber hairs.

The acrylic high elastic putty material is not limited in its kind, and various kinds of commercially available and commercially available materials can be used. However, the acrylic type is used as a highly elastic putty material because the outer wall of the conventional concrete structure is painted with an acrylic water-based paint. Therefore, when other acrylic type than the acrylic type is used, problems such as adhesiveness and heterogeneity may occur. This is not easy.

At this time, it is preferable that the highly elastic putty material is applied to a thickness of about 0.2 to 0.5 mm, and if it is out of this range, it is difficult to repair the micro cracked portion and the adhesion is deteriorated.

remind Acrylic high elasticity Putty  On the surface of the filled and overlapped concrete structure, High elasticity With putty  1 < tb > putty  Coating the composition.

Next, the acrylic high elasticity putty material is painted again on the surface of the concrete structure filled and overlapped. Here, the putty composition means a mixture of the acrylic high-elasticity putty material and the first grade paint composition, more preferably, 50 to 70% by weight of the acrylic high-elasticity putty material is mixed with 30 to 50% by weight of the first grade paint composition .

In other words, in the case of repairing a structure using only acrylic high-elasticity putty material, it is necessary to work using rubber hera, so that the putty mark is continuously exposed on the outer surface, Cracks can not be efficiently repaired. In addition, there was a disadvantage that the surface of the high elasticity putty material was blurred due to the oil content, and additional painting work was performed with a separate water-based paint.

Accordingly, the present invention is to reduce the hardening shrinkage of the putty composition by the primary coating composition by mixing the acrylic high elasticity putty material with the first level paint composition and finally coating, thereby eliminating the shine caused by the oil. Also, because of this work, there is no need to coat exterior paint separately, and work efficiency is also improved.

In addition, the putty composition mixed with the first grade paint composition has a low viscosity and can be coated using a roller, a brush and a spray, thereby solving the problem that the putty mark is exposed to the outside.

The putty composition can be coated with a thickness of 0.1-0.5 mm, and when it is coated with such a thickness, the repair and physical properties of microcracks are excellent.

In the present invention, as the above-mentioned first-level coating composition, a variety of commodities commercially available and commercially available exterior wall paints can be used.

The concrete structure thus repaired is advantageous in that the fine structure can be more efficiently repaired than when using only the highly elastic putty material. In addition, it is possible to omit a separate exterior paint job, which is advantageous in terms of work efficiency.

In the meantime, although a separate description is omitted in the present invention, the primer may be applied before filling and overlapping the high elasticity putty material, and its implementation is not limited.

In addition, in the step of filling and overlapping the acrylic high elastic putty material on the surface of the concrete structure from which the foreign matter has been removed, the acrylic high elasticity putty material may be filled and overlapped with the first grade paint composition after the first grade paint composition is mixed. . When the primary coating composition is mixed as described above, the micro crack can be more effectively repaired without causing a putty mark to appear from the primary coating operation, and the overall appearance can be further enhanced. Here, the mixing ratio thereof is preferably 1: 0.1 to 0.2 weight ratio of the acrylic high-elastic putty material and the first grade coating composition.

Applying a rustproofing agent containing 70 to 80% by weight of ethylene glycol and 20 to 30% by weight of a polyolefin resin to the cracked portion of the surface of the structure from which the foreign substances have been removed after removing foreign matter on the outer wall of the building; , 35 to 40% by weight of silica, 15 to 40% by weight of cement, 12 to 13% by weight of silica, 48 to 52% by weight of an acrylic polymer, 1 to 2% by weight of a dispersing agent and 10 to 14% Filling the mortar mixed with 86 to 90% by weight of the second mixture of water and the remainder of water, and then filling and overlapping the acrylic high elasticity putty material.

That is, in the case where a structure requiring crack repairing is not only micro-cracked, but also a reinforcing bar is exposed, or a cracked portion is 1 mm or more, the cracked portion can be repaired through the additional work as described above.

The rustproofing agent includes 70 to 80% by weight of ethylene glycol and 20 to 30% by weight of a polyolefin resin. The ethylene glycol stabilizes the polyolefin resin and improves the adhesion. Polyolefin resins represented by polypropylene or polyethylene have various excellent physical properties, chemical properties, mechanical properties, molding processability, and are widely used in many industrial fields in addition to low cost. However, since the polyolefin resin is non-polar, it has poor adhesion and affinity with metals, glass, polar polymer materials and the like, and it is difficult to form a composite with these various substrates. Therefore, in the present invention, ethylene glycol was used for the polyolefin resin.

The method of applying the rust preventive agent is not limited, and its thickness is not limited, and it is sufficient if it is about 0.1 to 0.5 mm.

And the mortar filled in the cracked portion coated with the rust preventive coating agent is composed of 35 to 40% by weight of silica sand, 48 to 52% by weight of an acrylic polymer, 1 to 2% by weight of a dispersing agent and 10 to 14% 12 to 13% by weight of cement, and 86 to 90% by weight of a second mixture comprising the remainder of water. These mortars are characterized by superior durability, adhesiveness and strength compared to general cement mortars.

Here, the sandpaper having a size of 40 to 60 탆 is used, and when the sandpaper of this size is used, the outer wall finishing becomes clear. Because acrylic resin is used as binder and inorganic repair material is used, the pH is the same as 12 ~ 13 of conventional concrete, and it is preferable as repair coating of damaged reinforcing bar due to low generation of carbon dioxide gas during curing .

At this time, the mortar may be filled after the curing of the rustproofing agent is completely completed, and may be filled before curing the rustproofing agent.

Further, it is natural that after filling the mortar, the acrylic high elastic putty material can be worked regardless of whether the mortar is cured or not.

In the present invention, as the acrylic high elastic putty material, 1 to 1.5% by weight of titanium dioxide, 1 to 3% by weight of trimethyl-2,4-pentanediol isobutyrate 1 to 3% by weight of ethylene glycol, 30 to 40% by weight of calcium carbonate, 40 to 50% by weight of an acrylic emulsion, and the balance water.

The putty material having such a composition is the most favorable form for repairing the microcrack region, and is advantageous in that it is stable for microcracks because of mutual interaction between the components, hardly shrinks due to hardening, and is excellent in waterproof performance.

The primary coating composition may further contain 5 to 10 wt% of pigment, 10 to 15 wt% of titanium dioxide, 15 to 20 wt% of calcium carbonate, 40 to 50 wt% of resin binder, 5 to 10 wt% of polyhydric alcohol, 0.5 To 2% by weight of an antifoaming agent, 0.5 to 1% by weight of an antifoaming agent, 0.5 to 1% by weight of a thickener, and the balance water.

Here, the pigment is used for coloring the paint composition, and a generally known variety of pigments can be used. The titanium dioxide, which can be used as a fine powder, has antimicrobial, antifungal and curing properties through its mixing. The above-mentioned calcium carbonate is used as an ordinary filler. The resin binder is preferably a mixture of an acrylic resin and an epoxy resin in a weight ratio of 1: 0.2 to 0.3, since this helps improve the durability and waterproofness of the paint. In addition, ethylene glycol or propylene glycol may be used as the polyhydric alcohol, and dispersants, defoamers, and thickeners are not limited to the kinds of the components commonly used in the paint composition.

That is, when the acrylic high elasticity putty material and the putty composition obtained by mixing the paint composition are used as described above, it is possible to repair the micro crack more stably and to make the appearance more beautiful.

Meanwhile, although it is not described separately, it is natural that a crack region requiring penetration cracking or injection reinforcement can be reinforced by applying an acrylic-based injection method.

(Example 1)

A putty material comprising 1% by weight of titanium oxide, 2% by weight of trimethyl-2,4-pentanediol-1,3-isobutylate, 2% by weight of ethylene glycol, 35% by weight of calcium carbonate, 45% by weight of acrylic emulsion, Respectively.

Then, 50% by weight of a mixed resin binder obtained by mixing 10% by weight of pigment, 10% by weight of titanium dioxide, 15% by weight of calcium carbonate, an acrylic resin and an epoxy resin in a ratio of 7: 3, ethylene glycol 5% 1% by weight of a defoaming agent, 1% by weight of a thickener and water of the remainder.

Next, the putty material and the coating composition were mixed at a weight ratio of 6: 4.

(Test Example 1)

The composition of Example 1 was tested by the Korean Chemical Fusion Test Institute for tensile strength, tear strength and elongation at break, and the results are shown in Table 1 below.

Results of Test Example 1. Test Items Example 1 [ Test Methods Tensile strength (N / mm 2) 2.2 KS F 3211: 2015 Tear strength (N / mm) 20.3 KS F 3211: 2015 Elongation at Break (%) 278 KS F 3211: 2015

As can be seen from Test Example 1, Example 1 according to the present invention can confirm that only the putty material has excellent tensile, tear strength and elongation.

As a result, the method of the present invention can simplify the work because it is easy to repair fine cracks because of less physical shrinkage and hardening shrinkage, and it is possible to omit a separate external painting paint job because the appearance is good Respectively.

The invention being thus described, it will be obvious that the same way may be varied in many ways. Such modifications are intended to be within the spirit and scope of the invention as defined by the appended claims.

Claims (6)

Removing foreign matter on the surface of the concrete structure,
Filling and overlapping the acrylic high elastic putty material on the surface of the concrete structure from which the foreign matter has been removed,
Coating a putty composition obtained by mixing an acrylic high-elasticity putty material and a first-level paint composition on a surface of a concrete structure filled and overlapped with the acrylic high-elasticity putty material,
Lt; / RTI >
The above-mentioned first-
5 to 10 wt% of a pigment, 10 to 15 wt% of titanium dioxide, 15 to 20 wt% of calcium carbonate, 40 to 50 wt% of a resin binder, 5 to 10 wt% of a polyhydric alcohol, 0.5 to 2 wt% of a dispersant, By weight of a thickener, 0.5 to 1% by weight of a thickener, and the remainder of water.
The method according to claim 1,
The putty composition comprises
Wherein a 50 to 70% by weight of the acrylic high elastic putty material is blended with 30 to 50% by weight of a primary coating composition, and a crack repairing method of a concrete structure having a painting function.
3. The method according to any one of claims 1 to 3,
The acrylic high-
1 to 3% by weight of trimethyl-2,4-pentanediol-1,3-isobutylate, 1 to 3% by weight of ethylene glycol, 30 to 40% by weight of calcium carbonate, 40 to 50% by weight of acrylic emulsion, And the water of the remainder is water. The crack repairing method of a concrete structure having a painting function.
delete Removing foreign matter on the surface of the concrete structure,
Applying a rustproofing agent containing 70 to 80% by weight of ethylene glycol and 20 to 30% by weight of a polyolefin resin to the cracked portion of the surface of the concrete structure from which the foreign substance is removed,
Wherein the rustproofing agent is applied to the cracked portion with 35 to 40 wt% of silica, 12 to 13 wt% of cement, 15 to 40 wt% of silica, 1 to 2 wt% of acrylic polymer, 1 to 2 wt% of dispersant, and 10 to 14 wt% % And a remainder of water, and filling the mortar with the mortar,
Filling and superposing an acrylic high-elasticity putty material on a surface of the cracked portion coated with the rust-inhibitive agent and filled with the mortar;
Coating a putty composition obtained by mixing an acrylic high-elasticity putty material and a first-level paint composition on a surface of a concrete structure filled and overlapped with the acrylic high-elasticity putty material,
Lt; / RTI >
The above-mentioned first-
5 to 10 wt% of a pigment, 10 to 15 wt% of titanium dioxide, 15 to 20 wt% of calcium carbonate, 40 to 50 wt% of a resin binder, 5 to 10 wt% of a polyhydric alcohol, 0.5 to 2 wt% of a dispersant, By weight of a thickener, 0.5 to 1% by weight of a thickener, and the remainder of water.
6. The method according to any one of claims 1 to 5,
In the step of filling and overlapping the acrylic high elastic putty material on the surface of the concrete structure from which the foreign matter has been removed,
A method for repairing a crack in a concrete structure having a painting function, characterized in that the acrylic high-elasticity putty material is mixed with a first grade paint composition and then charged and overlapped.

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