JP2003013609A - Restoring method of fair-faced concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the restoring method of fair-faced concrete capable of restoring the loss part of the fair-faced concrete at a low cost without requiring skill. SOLUTION: The restoring method has a mortar filling process S1 for filling the loss part brought on the surface of the fair-faced concrete with cement mortar, and a gradation process S5 for hitting and applying gradation application material from the upper part of cement mortar filled by the mortar filling process S1 and finished so as to be substantially the same color and substantially the same spotted pattern as the circumferential building frame surface of the restoring part while concealing the color of cement mortar.

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 exposed concrete for repairing a defective portion formed on the surface of the body of exposed concrete.

[0002]

2. Description of the Related Art Exposed concrete has a natural beauty and a solid taste that improve the design of a building.
It has been widely adopted in recent years. Such exposed concrete is created by placing concrete in a formwork, removing the mold after drying and curing the concrete, and transferring the formwork pattern on the formwork surface to the concrete surface, The beauty and dignity is played.

However, the surface of the finished exposed concrete may have a recessed portion (hereinafter referred to as a defective portion) from the surface of the surrounding structure due to a hole called a junker or a part of the wall of the corner portion missing. However, when such a defect occurs, the design of exposed concrete is significantly impaired. Normally, it is almost impossible to form exposed concrete without causing these defects, so various techniques have been proposed for how to repair the concrete.

Therefore, after filling the defective portion with mortar,
It has been generally done to smooth the surface with a trowel etc. to make it approximately flush with the surrounding frame surface, but the surface of exposed concrete has a slightly different color tone depending on the location. Therefore, it was necessary to mix the mortar to be filled so that the color of the mortar matches the surface of the surrounding skeleton.

Conventionally, such a mortar is prepared by mixing white cement and Portland cement so as to match the color of the surrounding skeleton, adding a synthetic resin emulsion to this, and optionally adding a pigment of a predetermined color. It was done by making fine adjustments. Even if the repaired part of the defect is completely matched with the color of the surrounding surface, it will have a uniform color tone like painting, and the appearance will be different from that of the surrounding surface which is mottled. Since the above problems may not be resolved, a restoration material of a specified color is tapped (or doted) on the filled mortar to reproduce the mottled pattern, and the gradation effect makes it possible to improve the appearance of the surrounding surface. The difference was also suppressed.

[0006]

However, in the above-mentioned conventional method for repairing exposed concrete, it is necessary to mix so that the color of the mortar to be filled matches the surface of the surrounding skeleton. There was a problem that it required. That is, while the filling operation of the restoration material into the defect portion itself is a relatively unskilled work such as making the surrounding body surface and the upper surface of the restoration material flush with each other,
Since it requires skill to prepare the restoration material to be filled, it is not possible to perform a division of labor such as performing color matching by an unskilled person while filling the restoration material by an unskilled person. However, there is a problem that the manpower is insufficient, the construction period is long, and the cost for repair is high.

There is also a problem in that the repair results may differ due to variations in the individual ability of the skilled person, and the workable range is limited due to problems such as the aging of the skilled person and the decrease in the number of persons. . Both of these problems are caused by the need for skill in color matching during restoration work, and there has been a demand for facilitation (non-skill) of such color matching work.

The present invention has been made in view of the above circumstances, and provides a method for repairing exposed concrete that can repair a defective portion of exposed concrete at low cost without requiring skill. is there.

[0009]

The invention according to claim 1 is
Mortar filling step of filling the mortar in the defect portion generated on the exposed concrete surface, tapping the gradation coating material from the mortar filled by the mortar filling step, and hiding the color of the mortar while surrounding the repaired portion And a gradation process for finishing to have a mottled pattern having substantially the same color and substantially the same as the surface of the frame.

According to this structure, the color of the mortar filled in the mortar filling step is hidden by the gradation coating material in the gradation step, and by the tapping of the gradation coating material, the mottled pattern which is substantially the same as the surrounding skeleton surface. To form. Here, since the gradation coating material has substantially the same color as the surface of the body around the repaired portion, the color of the mortar filled in the mortar filling step is newly colored while being concealed.

According to a second aspect of the present invention, after the mortar filling step, a permeation type waterproofing agent or a wet color preventing sealer is applied to the surface of the body.

The invention according to claim 3 is characterized in that, after the gradation step, there is a form pattern forming step of forming a form pattern of substantially the same color as the surface of the body around the repaired portion.

According to a fourth aspect of the present invention, the gradation coating material comprises a synthetic resin emulsion containing a titanium oxide pigment and a pigment composed of iron oxide.

According to this structure, since the restoration portion is colored with the titanium oxide pigment and the pigment composed of iron oxide, the color does not change remarkably before and after the gradation coating material is dried. Here, the adhesion of the gradation coating material to the repaired portion is improved by mixing the pigment with the synthetic resin emulsion.

According to a fifth aspect of the present invention, in the gradation coating material, when the weight of the synthetic resin emulsion is 100, titanium oxide is approximately 38.0, red iron oxide is approximately 0.005, and yellow is approximately yellow. About 0.101 iron oxide,
And black iron oxide are mixed in a ratio of about 0.13.

The invention according to claim 6 is characterized in that the gradation coating material is arbitrarily selected based on the color of the surface of the skeleton among a plurality of gradation coating materials prepared in advance by adjusting to a predetermined color. To do.

According to a seventh aspect of the present invention, the plurality of prepared gradation coating materials are adjusted to a predetermined color based on the measurement value of a color difference meter that digitizes the color of the surface of the body of exposed concrete. Characterize.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described with reference to the drawings. The method for repairing exposed concrete according to the present embodiment is a method for repairing a defective portion such as a jumper generated on the surface of exposed concrete while reproducing the design of exposed concrete at the repaired portion. As shown, mortar filling step S
1, substrate adjusting step S2, penetration type waterproofing agent applying step S3, wet color preventing sealer applying step S4, gradation step S
5, form pattern forming step S6 and top coat forming step S
It has 7 working steps.

The mortar filling step S1 is a step of filling the cement mortar 2 into the defective portion 1b generated on the body surface 1a of the exposed concrete 1 as shown in FIG. 2 (a), as shown in FIG. 2 (b). Is. The cement mortar to be filled here may be a commonly used appropriate cement mortar (for example, a mixture of cement and synthetic resin emulsion and aggregate etc.), and it is not necessary to perform separate color matching. Absent. That is, since the color of the filled cement mortar is hidden by the gradation coating material described later, the color matching of the cement mortar itself is unnecessary.

The substrate adjusting step S2 is a mortar filling step S.
The surface of the cement mortar 2 filled with 1 is smoothed by a sander or plastering iron, and the upper surface of the cement mortar 2 and the surface 1a of the exposed concrete 1 are substantially flush with each other (see FIG. 2 (c)). It is a process of modifying so that After this step, the difference in color between the repaired portion and the surrounding body surface 1a still remains clear.

The permeation-type waterproofing agent applying step S3 is a step of uniformly applying the permeation-type waterproofing agent to the entire repaired area with a brush or spray. Such a penetration type waterproofing agent is used for the body surface 1a.
It is preferable not to form a coating film on the surface of the concrete, but to form a permeation layer 3 as shown in FIG. 2 (d) by penetrating into a capillary tube (pinhole) generated by evaporation of water near the concrete surface, It is most preferable to use a silicon-based permeation-type waterproofing agent containing silane, silicon, siliconate, or the like as a main component.

The wet color preventing sealer applying step S4 is a step of applying a wet color preventing sealer on the permeation layer 3 of the permeation type waterproofing agent. The wet-color preventive sealer is, for example, a coating-type waterproof material having a synthetic resin emulsion as a main component, and forms a waterproof coating film 4 at a repaired portion as shown in FIG. 2 (e). . The permeation-type waterproofing agent coating step S
3 and the wet color prevention sealer applying step S4 can be omitted depending on the condition of the concrete to be restored.

The gradation step S5 is a step in which the gradation coating material is tapped on the cement mortar 2 filled in the mortar filling step S1 through the waterproof coating film 4. By applying the step, the gradation step S5 is performed. It is possible to conceal the color and finish it so as to have a substantially same color and substantially the same mottled pattern as the body surface 1a around the repaired portion.

That is, since the gradation coating material is made of an opaque color coating material, the gradation layer 5 (see FIG. 2 (f)) is formed at the repaired portion to hide the color of the cement mortar 2. At the same time, by tapping the gradation coating material, it is possible to form a mottled pattern similar to the body surface 1a around the repaired portion. At the same time, the gradation effect (blurring effect) by tapping makes the boundary between the repaired portion and the surrounding body surface unclear, and prevents the design of the repaired portion from being significantly different from the surrounding body surface.

For the above-mentioned beating of the gradation coating material, it is preferable to use an applicator having a felt (impregnating material) fixed to the surface of a base made of, for example, wood or foamed plastic material. According to such an applicator, after a proper amount of gradation coating material is applied on the felt, the operator who holds the substrate can repeatedly press the repaired portion to tap it, resulting in a natural feeling due to blurring. Can be obtained. The tool for tapping is not limited to the above-mentioned applicator, and various other tools (work gloves, non-woven fabric, etc.) can be used.

Here, the gradation coating material is preferably a synthetic resin emulsion containing a titanium oxide pigment and a pigment composed of iron oxide, and more specifically, an acrylic ester synthetic resin emulsion (solid content). Rutile titanium oxide and red, yellow, black iron oxide are mixed as pigments, and a pigment dispersant, a wetting agent, a thickener, a defoaming agent, an antiseptic / mold inhibitor, etc. are appropriately added. preferable.

The most preferable mixing ratio of the above components is that when the weight of the acrylic ester synthetic resin emulsion (solid content) is 100, rutile type titanium oxide is approximately 38.
A mixture of red iron oxide of about 0.005, yellow iron oxide of about 0.101, and black iron oxide of about 0.13 is used. It is varied to obtain a gradation coating material of a desired color.

According to the gradation coating material composed of the above-mentioned components, the gradation effect can be sufficiently exerted while effectively concealing the color of the cement mortar 2 filled in the repaired portion, and coloring is carried out by the inorganic pigment. The color does not change significantly before and after drying the gradation coating material, so no skill is required for color adjustment work,
Color adjustment or selection can be performed accurately. Furthermore,
Since the gradation coating material does not contain any cement-based material, it is possible to prevent the white flower phenomenon after coating.

The color of the gradation coating material may be adjusted on site by the operator looking at the color of the body surface and adding a suitable pigment, but a plurality of colors are prepared by adjusting the color to a predetermined color in advance. It is preferable that the operator arbitrarily selects one of the gradation coating materials based on the color of the surface of the body. In this case, the color matching operation of the gradation coating material can be further facilitated.

Here, it is preferable that each of the gradation coating materials prepared in advance is adjusted to a predetermined color on the basis of the measurement value of a color difference meter that digitizes the color of the surface of the body of exposed concrete. For example, the chromaticity of the surface of the frame after the exposed concrete is poured is measured by a small portable color difference meter, and the measured values have L, a, and b values (optical numerical values based on the measured colors) of the same color Gradation coating material (hereinafter referred to as A coating material), and gradation coating material having different color tones (for example, a and b values are constant and L value is increased or decreased in small amounts). A plurality of (may be appropriate, for example, about 10 to 20 kinds) are prepared, and these are stored in a warehouse or the like as a so-called kit.

The operator carries a plurality of gradation coating materials arbitrarily selected based on the color of the body surface of the kit to the site, and one or a plurality of them are applied in parallel. When striking several in parallel,
Visually observe the surface of the structure that is to be restored, and apply a gradation coating material with a large L value while tapping the gradation of the coating material A with a large amount of black while using an A coating material as the basic color for a lot of white. Try to apply a gradation coating material with a small value. The tone of concrete can be reproduced more realistically by changing the tapping frequency of the gradation coating material having a large L value or the one having a small L value.

As described above, an operator who actually paints by tapping is only required to select one of the gradation coating material included in the kit and the carried gradation coating material, and the color adjustment work requiring skill is unnecessary. Therefore, the color matching operation of the gradation coating material can be further facilitated. Further, since each gradation coating material is manufactured based on the numerical value obtained by the color difference meter, the management of the kit can be facilitated and the operator can easily and objectively select the gradation coating material. You can

The formwork pattern forming step S6 is a process of forming a formwork pattern having substantially the same color as the surface of the skeleton around the repaired area at the repaired area. That is, on the surface of the skeleton of the exposed concrete, there is a mottled pattern reproduced in the gradation step S5 as well as a frame pattern transferred from the frame at the time of demolding. It also reproduces the pattern.

For example, an elastic sheet is fixed to the surface of a base made of a long and narrow rectangular wooden board, and the surface of the elastic sheet has a grain pattern (grain pattern form) or a regular pattern (actual form pattern). It is preferable to use a pattern forming tool formed by fixing a sheet plate made of soft silicone rubber on which a wood grain pattern is engraved. The operator impregnates the cloth material of the formwork pattern forming tool with a brush or the like using a mixed resin solution (preferably a resin emulsion having waterproof performance) adjusted to have substantially the same color as the wood grain pattern portion on the surface around the restoration site. Then, the formwork pattern can be formed by holding the base and pressing the wood grain pattern side to the repaired portion.

The last step, top coat forming step S
7 is a step of forming a top coat coating film (not shown) by applying a transparent waterproof material (that is, a top coat) over the entire surface of the repaired portion by using a brush, a roller, spraying, or the like. . As such a top coat, a fluororesin or acrylic silicone resin-based one can be used, and as the acrylic silicone resin-based one, NY-9090
(Nichie Yoshida Co., Ltd.) is preferably used.

Although the present embodiment has been described above, the present invention is not limited to this. For example, as shown in the flow chart of FIG. 3, the mortar filling step S1, the substrate adjusting step S2, and the permeation type waterproofing agent application. Each working step may be performed in the order of step S3, gradation step S5, wet color preventing sealer applying step S4, formwork pattern forming step S6, and topcoat forming step S7. Since the work content of each step is the same as that of the previous embodiment, detailed description thereof is omitted here.

In the form pattern forming step S6 in FIG. 1 or 2, the surface of the frame of the exposed concrete is observed,
It may be omitted if there is no formwork pattern or if it is extremely thin. Although it has been described that the permeation type waterproofing agent applying step S3 and the wet color preventing sealer applying step S4 may be omitted, the top coat forming step S7 may be omitted in some cases.

[0038]

According to the first aspect of the present invention, it is possible to eliminate the need for a mixing operation such as color matching for the mortar to be filled in the defective portion, so that no skill is required and the exposed concrete is restored at a low cost. It can be performed. In particular, it is possible to perform division of labor such as performing color matching by a skilled person while letting an unskilled person perform the filling work of the restoration material, and thereby suppressing the extension of the construction period and the cost increase for the restoration due to lack of manpower of the skilled person be able to.

According to the invention of claim 2, after the step of filling the mortar, the permeation type waterproofing agent or the sealer for preventing the wetting color is applied to the surface of the skeleton. Therefore, the weather resistance and durability of the exposed concrete can be improved. Can be made.

According to the third aspect of the present invention, since the formwork pattern forming step is performed after the gradation step, it is possible to further improve the design of the exposed concrete after the restoration.

According to the invention of claim 4 or claim 5, the color does not remarkably change before and after the gradation coating material is dried. Therefore, it is easy to mix or select the color of the gradation coating material. Therefore, it is possible to eliminate the need for skill in the color matching work of the gradation coating material. In particular, since the titanium oxide pigment is contained, the color of the mortar filled in the restoration area can be sufficiently hidden.

According to the invention of claim 6, gradation coating materials of a plurality of colors can be prepared as a so-called kit, and it is sufficient for the operator to select any one included in the kit. The color matching work of the coating material can be further facilitated.

According to the invention of claim 7, the color of the gradation coating material is adjusted on the basis of the measurement value of the color difference meter for numerically expressing the color of the surface of the frame of the exposed concrete, so that the management of the kit is facilitated. In addition, the operator can easily and objectively select the gradation coating material.

[Brief description of drawings]

FIG. 1 is a flowchart showing a method for repairing exposed concrete according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view schematically showing a repaired part in main steps in the method for repairing exposed concrete according to the embodiment of the present invention.

FIG. 3 is a flowchart showing a method for repairing exposed concrete according to another embodiment of the present invention.

[Explanation of symbols]

1 ... exposed concrete 1a ... Body surface 1b ... Defect part 2… Cement mortar 3 ... Penetration layer 4 ... Waterproof coating 5 ... Gradation layer

Claims (7)

[Claims] 1. A mortar filling step of filling a mortar in a defect portion formed on a surface of exposed concrete, and a gradation coating material is tapped on the mortar filled in the mortar filling step to conceal the color of the mortar. And a gradation step of finishing so as to have a mottled pattern having substantially the same color and substantially the same color as the surface of the body around the repaired portion. 2. The method for restoring exposed concrete according to claim 1, wherein after the mortar filling step, a permeation type waterproofing agent or a wet color preventing sealer is applied to the surface of the skeleton. 3. The method according to claim 1 or 2, further comprising, after the gradation step, a formwork pattern forming step of forming a formwork pattern having substantially the same color as the surface of the body around the repaired portion. How to repair exposed concrete. 4. The gradation coating material is a synthetic resin emulsion containing a titanium oxide pigment and a pigment composed of iron oxide, according to any one of claims 1 to 3. The method for repairing the exposed concrete described. 5. The gradation coating material has titanium oxide of about 38.0 and red iron oxide of about 0.00 when the weight of the synthetic resin emulsion is 100.
5, the yellow iron oxide is approximately 0.101, and the black iron oxide is mixed in a ratio of approximately 0.13, and is exposed according to any one of claims 1 to 4. How to repair concrete. 6. The gradation coating material is selected from among a plurality of gradation coating materials prepared in advance by adjusting to a predetermined color based on the color of the body surface. Item 6. A method for repairing exposed concrete according to any one of items 5. 7. The gradation coating material prepared in a plurality is adjusted to a predetermined color based on a measurement value of a color difference meter that digitizes the color of the surface of the frame of exposed concrete. The method for repairing the exposed concrete described.