JP3209398B2 - Repair method of exposed concrete - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a fine defect such as a hair crack or a cold joint generated on the surface of a carcass of exposed concrete.

[0002]

2. Description of the Related Art Exposed concrete has a natural appearance with a grain pattern of a formwork reflected on the surface of a vehicle body. However, fine cracks called hair cracks having a width of about 0.2 mm or less are formed on the surface of the vehicle body. Boundary of joint)
Etc. may occur. Conventionally, in order to repair the defective portion, a method of suspending in a V-shape or U-shape along the defective portion and filling the hanging groove with a mortar that is color-matched to the surface of the precursor has been adopted. However, because the V-shaped or U-shaped portion is formed along the defect, the defect expands,
There is a drawback that the repaired part is left clearly.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for removing fine defects in the surface of a bare concrete frame.
A simple method, can be repaired as and repaired portions without increasing the該欠loss portion is not attached is apparently distinguished, in addition complement
It is to provide a method for repairing Uchihanashi concrete Ru can be improved adhesion to defect of Osamuzai.

[0004] In order to solve the above-mentioned problems, the present inventors have conducted intensive studies and found that mortar or cement powder, etc., which had been subjected to color matching on the surface of the exposed concrete while moistening the fine defects on the surface of the precursor. Apply powdery repair material
The present inventors have found that the above problem can be solved by a simple method of filling a defective portion, and have completed the present invention. That is,
The repair method of the exposed concrete of the present invention is a method of applying a powdery repair material, which is color-matched to the surface of the precursor in a state in which a fine defect portion of the precursor surface of the exposed concrete is moistened with moisture, and filling the defect portion, Exposed conch to remove excess repair material after drying
In the method of repairing a REET, the defective portion is
The defective area is moistened by applying
In a state in which it is in a state of being turned off . After removing the excess repair material, a pattern may be formed along the defective portion in accordance with the peripheral pattern of the defective portion, and then a transparent waterproof material may be applied to form a top coat.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below. The method for repairing exposed concrete according to the present invention is intended for repairing minute cracks or cold joints having a width of about 0.2 mm or less and appearing on the surface of a precursor of the exposed concrete, and such missing parts. Apply water or an aqueous polymer emulsion to the surface to make the area around the defect moistened with water, and before drying the water, repair the powdery material such as cement or mortar powder that has been matched with the prepared body surface in advance. The material is applied with hand, cloth, sponge or the like to fill the defective part. As a result, moisture penetrates into the powdery repair material such as cement or mortar powder filled in the defective portion, and the repair material hardens due to drying of the moisture.
Then, after the drying, the excess repairing material attached to the portion other than the filling portion is wiped off with a cloth or the like to be removed. By treating in this way, the repaired fine defect can be almost indistinguishable in appearance.

[0006] Here, in the wet the peripheral defect in water, to apply the water-soluble polymer emulsion along defect
You . According to the aqueous polymer emulsion having adhesiveness to concrete, the adhesiveness of the repairing material to the defective portion is improved, and the filled repairing material is hardly peeled off even by vibration or the like, which is preferable. Such aqueous polymers include those that exhibit elasticity after curing and those that do not. Examples of such an aqueous polymer include natural rubber latex, styrene butadiene rubber, chloroprene rubber, synthetic rubber latex such as acrylonitrile butadiene rubber, or a mixed latex of two or more of these, polyacrylate, polyvinyl acetate, vinylidene chloride, and vinyl chloride. Aqueous polymer dispersions such as thermoplastic resin emulsions such as poly (vinyl propionate) and ethylene vinyl acetate, thermosetting resin emulsions such as epoxy resins or mixtures of two or more of the above resins, ethylene vinyl acetate,
Re-emulsifiable powder resin such as vinyl acetate versatate (powder resin that is re-emulsified to form an emulsion when dispersed in water), cellulose derivatives, polyvinyl alcohol, polyacrylate (Ca salt, etc.), and water-soluble furfuryl alcohol And liquid polymers such as unsaturated polymers, unsaturated polyesters and epoxy resins. Of these,
Acrylic copolymer resins are preferred in that they are excellent in waterproofness and light resistance. One example of such an acrylic copolymer resin emulsion exhibiting elasticity after internal curing is Moviton LDM3750 (trade name, manufactured by Hoechst Gosei Co., Ltd.). Such a material having elasticity is suitable for use in a site where temperature changes rapidly, such as outdoors where sunlight is received. When used in an area where temperature change is not drastic, such as indoors, it may not exhibit elasticity. An example of such an acrylic copolymer resin emulsion is Movinyl 102E (trade name, manufactured by Hoechst Gosei Co., Ltd.).

[0007] A powdery repair material such as cement or mortar powder which is color-matched to the surface of the exposed concrete precursor is prepared by appropriately mixing, for example, white cement, Portland cement and white aggregate (stone powder). In some cases, fine aggregate such as sand may be appropriately mixed, and a pigment may be appropriately mixed.

After removing the excess repair material, a pattern is formed along the defective portion in accordance with the peripheral pattern of the defective portion, and then a transparent waterproof material is applied at least around the defective portion to apply a top coat. It may be formed. Here, in order to form a pattern along the defect, for example, Japanese Patent Application No. 7-100
As described in No. 122, a pattern forming tool is impregnated with a resin liquid prepared in substantially the same color as that of the concrete precursor, and a pattern similar to the peripheral pattern of the defective portion is formed by the pattern forming tool. Further, as the transparent waterproofing material, any material may be used as long as it prevents the mortar from absorbing moisture and moisture, and for example, an acrylate-based copolymer resin having excellent weather resistance is preferable, and Hoechst is an example of such a resin emulsion. There is a product name Movinyl 745 manufactured by Gosei Co., Ltd. Since this film has a hard coating film, is glossy, has excellent weather resistance, and has a minimum film forming temperature of about 0 ° C., it can be applied at room temperature as it is. In addition, since the above-mentioned polymer tends to yellow, an appropriate amount of a bluish gray pigment (about 0.05 to 1 part by weight of a pigment based on 100 parts by weight of the solid content of the polymer) is used as an anti-yellowing material of the polymer.
It can also be blended.

As described above, by forming a pattern along the defective portion, the defective portion (repair portion) of the exposed concrete is formed.
Is in tune with the surroundings, giving a finish that is comfortable. In addition, since the surface is covered with the top coat, intrusion of water from the outside is eliminated, deterioration and contamination are prevented, and durability is increased. In addition, if it is not necessary to form a pattern along the defective part and the defective part (repair part) is not apparently visible, the top coat can be formed by omitting the pattern forming step for the defective part. Can also.

[0010]

The present invention will be described in more detail with reference to the following examples. The examples are illustrative of the invention and do not limit the invention. Example 1 0.2 mm Appearing on Exposed Concrete Carrier Surface
Water is applied to a minute defect portion having a fine crack having a width of about the following to make the periphery of the defect portion moist with water, and a white cement 1 prepared in advance before the moisture is dried.
2: Ordinary Portland cement 1: White aggregate (stone powder)
The mortar powder, which had been mixed in a ratio of 1 with the precursor surface, was color-matched with a cloth, and was squeezed with a cloth to fill the defective portion. Then
After drying, excess mortar powder adhering to portions other than the filling portion was removed by wiping with a cloth. Due to such processing, the defective portion is almost indistinguishable in appearance.

Example 2 In place of applying water to the defective portion, an acrylic copolymer resin emulsion, which is an aqueous polymer emulsion, was applied by using Movinyl 102E (trade name, manufactured by Hoechst Gosei Co., Ltd.) with a resin content of 15%. Was treated in the same manner as in Example 1 to repair fine defects in exposed concrete. As a result of this treatment, the repair material filled in the defective portion has good adhesiveness, and the defective portion is almost indistinguishable in appearance. Furthermore, the peripheral pattern of the defective part (spot pattern)
In accordance with the above, the felt is impregnated with a prepared resin liquid prepared in substantially the same color as the spotted pattern portion, and after repeatedly pressing along the defective portion to form a pattern, a fine particle type acrylate copolymer resin emulsion is obtained. Water was added to Movinyl 745 (resin concentration 38%) (trade name, manufactured by Hoechst Gosei Co., Ltd.), and a transparent waterproof material having a resin concentration of 30% was applied to form a top coat. The repaired part treated in this way had durability and seemed to be in tune with the peripheral part without any unpleasant feeling.

[0012]

According to the method for repairing bare concrete according to the present invention, a powdery repair material is applied to the damaged portion while the defective portion is moistened with moisture, and the damaged portion is filled. After drying, the excess repair material is removed. In addition to the simple method of repairing the bare concrete without enlarging the minute defect on the surface of the exposed concrete, it can be easily repaired so that it is almost indistinguishable.
Water-based polymer emulsion with adhesive properties
Contact with defective parts of the repair material.
Good adhesion, repair material filled by vibration etc.
It is difficult to peel off, which is preferable. In addition, if a top coat is formed after the pattern is formed on the defective portion, the repaired portion is synchronized with the peripheral portion, so that the finished product has no uncomfortable feeling and the durability is enhanced. In addition, this repair method can be used not only for bare concrete, but also for repair of minute defects such as PC concrete, ALC concrete, and hair cracks generated on the surface of an inorganic board.

Claims (2)

(57) [Claims] 1. A Uchihanashi with a fine state defect was dampened in precursor surface of the concrete smeared powdery repair material that is color matched to precursor surface was filled into the defect, after drying excess repair material In the method for repairing exposed concrete, which removes water, an aqueous polymer emulsion is applied to the defective portion.
Characterized by the fact that the defective part is moistened
Repair method for exposed concrete. 2. After removing the excess repair material, a pattern is formed along the defective portion in accordance with the peripheral pattern of the defective portion, and then a transparent waterproof material is applied to form a top coat. 2. The method for repairing exposed concrete according to 1.