JPH1018566A - Finishing method for concrete placed surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reform a concrete exposed surface into a beautiful shape by applying surface finishing agent containing concrete permeable hydrophilic glue to the concrete placed surface and putting a synthetic resin non-hydrophilic film in contact therewith before hardened to uniform the surface. SOLUTION: Surface finishing paint is applied to a concrete placement surface mainly containing cement and gravel and a non-hydrophilic synthetic resin film is put in contact therewith in the non-hardened condition for coverage. The surface is polished and uniformed with a trowel and the film is separated therefrom after the fluidity of the finishing paint is dissolved. The surface finishing paint is formed by mixing cement slag, cement mortar, etc., into hydrophilic glue such as partial soap solution of polyvinyl acetate. The surface finishing paint can contains hydrophilic coloring agent such as water base dye, water paint, black writing fluid and titanium oxide. The material of the non- hydrophilic synthetic resin film is polyethylene terephthalate or, etc. In this way, the concrete placed surface is reformed in glossy appearance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for finishing a concrete casting surface which forms a large natural pattern by using the specific properties of the concrete casting surface. Utilizing the fact that the material tends to be unevenly distributed unevenly, the absorption and permeation characteristics of the surface coating material tend to be different due to the uneven distribution, and that the gloss is easily formed on the surface by the synthetic resin film. The present invention relates to a method for finishing a concrete casting surface that forms an irregular large natural pattern on the installation surface.

[0002]

2. Description of the Related Art When a building or a structure is formed by casting concrete, the inside and outside surfaces are often molded using plywood or the like. Due to non-uniform properties such as uniformity, eg, shape, size, specific gravity difference, etc., they are easily separated from each other despite uniform kneading before casting. In addition, it has been found that this tendency increases as the vertical length of the casting is increased, the flowability after casting is longer, and the inner surface of the form is closer. However, since the prevention of this separation is not easy, the problem has not been solved, and the surface finish paint such as cement mortar or cement slag is applied with the unsightly uneven concrete casting surface state at present. is there.

[0003] Recently, there has been a tendency to prefer an uneven appearance in which a pattern is formed on the casting surface, especially on the exposed surface, and by utilizing this appearance as it is, coating with a coloring material or releasing the surface of a synthetic resin film. A method of inverting and bonding a printed pattern applied to a casting surface has been proposed, but the method of applying the coloring material has problems of complicated work, a skill of an operator, and the like. However, this method is not always preferable because it requires preparation for printing on a film and the like, and the problem of weather resistance of adhesive strength to a casting surface remains.

[0004]

SUMMARY OF THE INVENTION The present invention solves the problem of poor appearance caused by the non-uniform appearance of the above-mentioned conventional concrete casting surface without using a coloring material coating or reverse adhesion of a printed pattern. It is an object of the present invention to solve the problem while positively utilizing the appearance non-uniformity which has been regarded as a problem.

[0005]

Means for Solving the Problems The present inventor has conducted various studies in order to solve the above-mentioned problems. As a result, the present inventors have found that when the surface to be cast is coated with a hydrophilic sizing material and a concrete permeable surface finish paint, the finish is applied. , Ironing through a special film,
Further, in some cases, by adding a permeable coloring material to the surface finishing material, the conventional phenomenon of causing non-uniform appearance is utilized in reverse, and a large natural pattern is formed on the concrete casting surface. And succeeded in completing the present invention. Next, the gist of the present invention will be described.

(1) A concrete-permeable surface finishing paint containing a hydrophilic paste is applied to a concrete casting surface, and a non-hydrophilic synthetic resin film is applied to the surface of the unsolidified surface finishing paint. A method for finishing a concrete casting surface in which the coated surface is abutted and squeezed with a trowel through the film to flatten the applied surface, and then the film is peeled off after the fluidity of the finishing paint is lost. (2) The method for finishing a concrete casting surface according to the above (1), wherein the concrete-permeable surface finish paint contains at least one selected from cement, dolomite, lime, cement glue, cement mortar, and polymer cement. (3) The method for finishing a concrete casting surface according to any one of the first and second aspects, wherein the concrete-permeable surface finish paint contains a hydrophilic colorant. (4) The method for finishing a concrete casting surface according to the above (3), wherein the hydrophilic colorant is an aqueous dye, a water-dispersible pigment or black ink. (Fifth) As a non-hydrophilic synthetic resin film, a thickness of 10 to 10
5. The method for finishing a concrete casting surface according to any one of the first to fourth aspects, wherein a 300 mm polyethylene terephthalate is used.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Concrete according to the present invention is mainly composed of cement, sand and gravel, and if necessary, aggregates such as silica sand, obsidian and vermiculite are added and kneaded with water. Or a cured product thereof.

[0008] Concrete casting is usually performed in the case of a flat horizontal surface or in the case of a vertical wall or pillar. In the former case, no formwork is required, but in the latter case, a mold such as a metal plate or a wooden plywood is used. A frame is needed. However, in any case, a phenomenon in which the composition material is separated over time after the uncured concrete is cast is observed. That is, a powder having a large specific gravity tends to separate and move downward, and a powder having a specific gravity that is easily buoyant has a slow sedimentation. In addition, large aggregates tend to easily collect on the surface of the formwork, which is a major cause of non-uniformity on the concrete casting surface. In addition, the fixed bars of the formwork tend to promote the material separation by obstructing the flow of concrete.

In any case, on the surface after casting, in addition to a portion mainly composed of cement powder, a portion composed of components almost in the same state as the composition at the time of casting, and an aggregate having a relatively large shape. It is a common phenomenon that the concrete hardened surface having such a large portion has a large and irregular appearance with an irregular shape.
On this casting surface, a surface finishing material usually containing a hydrophilic paste,
For example, cement mortar to paste such as methylcellulose,
Cement paste, cement mortar, etc. are added and applied. At this time, if there is unevenness or a missing portion on the casting surface, the coating is applied to a considerable thickness in consideration of repair and repair.

However, it is well known that even if the above-mentioned finish coating is performed, the irregular appearance of the concrete cast surface remains without being erased. It is not clear why this irregular pattern is visible and why,
It is presumed that the components of the concrete composition are due to differences in optical properties between the various parts resulting from the separation. That is, it is considered that there is a difference between normal reflection, scattered reflection, and partial absorption of light rays. Although it is not clear why this pattern remains after surface finishing as described above, it is considered that there is also a relationship with the optical non-uniform shape of the concrete surface, and the optical non-uniform shape of the concrete surface is
It is considered that the difference is expressed as a difference in absorption capacity of the surface finishing material with respect to the fluid, that is, a difference in absorption, permeability, and speed of the surface finishing material.

As described above, even after the surface coating, the optically non-uniform shape remains, making the appearance of the casting surface unsightly. Immediately after the surface coating, the inventor applied a non-hydrophilic synthetic resin film to cover the entire surface, and from the outer surface, squeezed the surface finishing material with a plastering trowel to coat the film and the coating. After removing the residual air between the surfaces to improve the adhesion between them, eliminating the trace of paint flow, adjusting the amount of coating, and smoothing the painted surface over a wide range, after the fluidity of the coating material disappeared, Preferably, after solidification, by exfoliating the film, succeeded in obtaining a finished painted surface in which an irregular pattern with excellent surface gloss emerged, and easily appeared on the concrete casting surface, a stain-like appearance, It became possible to change to a desirable pattern style by simple means.

In the surface finish paint of the present invention, a hydrophilic paste is first used. The paste improves the dispersibility of the cement-based material, and guides and penetrates well into the concrete casting surface. And having a function of bonding, a partially saponified aqueous solution of polyvinyl acetate, an aqueous solution or an aqueous emulsion of an ethylene-vinyl acetate copolymer or a partially saponified product thereof, an aqueous solution or an aqueous emulsion of an ethylene-acrylic acid copolymer, carboxy Methyl cellulose aqueous solution, methyl cellulose aqueous solution, starch aqueous solution and the like are preferably used.

[0013] In addition to the above-mentioned sizing agent, the above-mentioned surface finishing paint has a cement paste which is permeable to concrete,
Cement mortar, polymer cement mortar, and the like are blended, and cement, dolomite, lime, and the like can be appropriately added in consideration of the color tone of the finishing material, curability, and solidification volume as a measure against unevenness.

As cement components, commonly used portland cement, blast furnace cement, alumina cement,
A jet cement, a white cement, or the like, and a material appropriately mixed with gypsum are appropriately used. The polymer cement mortar is preferably used as a material permeable to concrete from the viewpoint of improving adhesiveness, water resistance, paintability and the like. The composition ratio is usually about 0.5 to 30% by weight of cement / polymer and 0 to 2% of fine aggregate / cement.
Most preferred is about 00% by weight. Fine aggregates include heavy aggregates such as silica sand and river sand, fly ash,
Light aggregates such as slag, shirasu balloon, burned vermiculite, etc. can also be used.

The water-dispersible polymer component used in the polymer cement mortar includes ethylene- (meth) acrylic acid (methyl) copolymer, ethylene-vinyl acetate- (meth) acrylic acid (methyl) copolymer, and styrene. -In addition to (meth) acrylic acid (methyl) copolymer system, ethylene-vinyl acetate copolymer or saponified product solution or emulsion, natural or synthetic rubber latex (SB
R, NBR, CR, MBR, etc.) are used.

As the surface finishing material, a coloring material is used as necessary, and the difference in permeability of the coloring material contributes to the formation of an irregular pattern on the concrete casting surface. The coloring material used is preferably a water-based dye, a water-based paint, a water-dispersible pigment, and the like, and a color close to the color tone of the concrete casting surface is preferable. A suitable formulation of the pigment dispersion type pigment is particularly preferred. In particular, the black ink is one of the materials in which agglomeration is observed and a pattern easily occurs, probably because of the presence of glue. As the pigment, iron oxide, carbon black (black), titanium oxide (white), loess (yellow), redwood (red), ultramarine (blue) and the like are particularly preferably used because of their good weather resistance.

In the present invention, immediately after the above-mentioned surface finish coating, a film made of a non-hydrophilic synthetic resin is brought into contact with the film, and the surface finish paint is wrung from the outer surface with a plastering trowel. The trowel to be used is not particularly limited, but a trowel with a roller is most preferable in terms of workability. In addition, the effect of the ironing action from the outer surface of the film is exhibited in addition to the above-described effects, even in the case of small unevenness correction on the entire surface where the concrete is cast. It is observed that, by correcting the unevenness, a difference in the paint thickness on the casting surface is created, which also contributes to the embossment of the surface pattern. In any case, according to the method of the present invention, a smooth, glossy colored pattern is likely to occur after the film is peeled off, so that a striped pattern, a scale-like pattern, and other irregular-shaped patterns are formed on the concrete casting surface. There are easy features.

By using a non-hydrophilic synthetic resin film used in the present invention, it is possible to prevent the film itself that has come into contact with the surface finishing paint from sticking to the coated surface when the surface finishing paint is not solidified. In addition, the rigidity is not reduced due to the absorption of water from the surface finishing paint, so that it is not difficult to remove the film. In addition, a film having a smooth surface is particularly preferable from the viewpoint of the improvement of the exfoliation property. It is convenient to use a porous film having a large number of perforations having a pore diameter of about several to several tens [mu] m in order to easily release air from the inner surface of the film using a trowel.

Examples of the non-hydrophilic film used in the present invention include polyethylene films of synthetic resin films, especially high-density polyethylene films, polyester films, polyacrylonitrile films, hard polyvinyl chloride films, and polystyrene films. However, polyester films such as polyethylene terephthalate are preferred in terms of tear resistance characteristics, rigidity, strength and the like. The selection of the preferable thickness of the film depends on the type of the synthetic resin, but is not particularly limited. However, from the necessity of having an ironing effect on the surface-finished painted surface, 10 to 300
It is preferably about μm, and particularly preferably about 30 to 150 μm.

If necessary, a waterproofing agent (such as a silicone-based waterproofing agent) and a deterioration inhibitor (an ultraviolet-ray-protected paint) may be applied to the surface of the cast film, which has been exfoliated and has a high gloss and has a raised pattern. ) Is also preferably employed.

[0021]

Next, the present invention will be described with reference to examples. Two wood-based plywoods were used as a mold, and concrete was cast with a gap of 10 cm. Leave the mold for 2 days, remove the mold, and apply a 5% aqueous solution of a partially saponified ethylene-vinyl acetate polymer as a paste and a cement paste with black ink as a colorant as a surface finishing material on the entire concrete casting surface. Immediately thereafter, a 50 μm-thick polyester film was brought into contact with the plaster, and a plastering iron with roller was sufficiently squeezed from the outer surface to bleed air and smooth the painted surface. After leaving the film for one day, the film was gently peeled off, and the ink unevenness and other finish paints generated on the concrete casting surface changed the appearance unevenness into a glossy beautiful pattern, and as a result, the concrete casting surface originally had It was observed that the non-uniform appearance of the stained surface was completely eliminated.

[0022]

According to the present invention, the concrete-casting surface has an inherent contamination-like appearance resulting from the separation of composition components, and the surface-finished paint-coated surface using the non-hydrophilic synthetic resin film of the present invention. It can be seen that the treatment can be changed to a pattern appearance having excellent surface gloss, and the concrete casting surface can be aesthetically modified regardless of whether the casting surface has changed with time.

Claims (5)

[Claims] 1. A concrete permeable surface finishing paint containing a hydrophilic paste is applied to a concrete casting surface, and a non-hydrophilic synthetic resin film is brought into contact with the surface of the unsolidified surface finishing paint applied. A method for finishing a concrete casting surface, characterized in that the surface is coated, the coating surface is squeezed with a trowel through the film, and the film is exfoliated after the fluidity of the finishing paint is lost. 2. A concrete permeable surface finish paint,
The method for finishing a concrete casting surface according to claim 1, comprising at least one selected from cement, dolomite, lime, cement slag, cement mortar, and polymer cement. 3. A concrete permeable surface finish paint,
The method for finishing a concrete casting surface according to claim 1, further comprising a hydrophilic colorant. 4. The method according to claim 3, wherein the hydrophilic colorant is an aqueous dye, a water-dispersible pigment or black ink. 5. A non-hydrophilic synthetic resin film having a thickness of 1
5. The method for finishing a concrete casting surface according to claim 1, wherein polyethylene terephthalate having a thickness of 0 to 300 mm is used.