JPH07310418A - Wet finish method for concrete building frame - Google Patents

Abstract

PURPOSE:To provide a mechanical key (anchor) effect automatically in addition to a bonding effect on finished material by simply coating a primer comprising polymer dispersion on a concrete building frame or bed mortar, or mixing the polymer dispersion into the mortar. CONSTITUTION:In a mortar coated bed concrete in which a primer 2 comprising polymer cement mortar is applied on the surface of a concrete building frame 1 and a bed mortar 4 is coated on the surface of the primer 2, minute fibers smaller in diameter than adhesive molecules are mixed and diffused in the primer 2 beforehand. Then, in forming of a film, a raising layer 3 comprising minute fibers is formed projectedly on the surface of it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet finishing method for a concrete skeleton in which the adhesion between a concrete skeleton and a base mortar applied to the surface of the concrete skeleton and the adhesion between the mortar and a surface finishing material are improved.

[0002]

2. Description of the Related Art Generally, in a concrete skeleton structure, after the concrete is sufficiently dried, a mortar is used to prepare an undercoat to finish the painting, or a surface is finished by tiling.

A particular problem in these finishes is how well the concrete skeleton or base mortar and the finish are adhered and integrated.

Therefore, conventionally, a synthetic resin emulsion is applied as a primer to the surface of a concrete skeleton, or a synthetic resin emulsion is mixed in mortar to improve the adhesiveness.

The adhesive used as the former primer is an ethylene vinyl acetate (EVAc) type polymer dispersion, and the latter adhesive is a styrene butadiene synthetic rubber (SBR) type polymer dispersion.

[0006]

However, if the primer is used incorrectly, for example, the timing of mortar application is delayed after application, a polymer film is formed at the interface of the adhesive surface, resulting in poor adhesion to the mortar. Is reduced,
There was a defect that the mortar was warped and peeled off easily.

By the way, the applicant of the present invention first disclosed in Japanese Patent Laid-Open No. 2-6
As shown in Japanese Patent No. 1584, a method of applying polymer cement mortar to the surface of a concrete skeleton, applying a fiber sheet having a three-dimensional network structure, and then adhering a surface finishing material to the concrete skeleton integrally is developed. .

[0008] This treatment method is a method to which a basic technique of building adhesion called "combined glue nails" is applied, which utilizes the anchor effect due to the unevenness of the fiber sheet in addition to the adhesive effect due to the polymer cement mortar.

However, this method requires labor for sticking the fiber sheet, impregnation of the inside with polymer cement mortar, and fluffing of the fiber sheet, which is a man-hour problem in practical use. there were.

The present invention is intended to solve the above problems, and an object thereof is to apply a primer comprising a polymer dispersion to a concrete skeleton or a base mortar, or to apply the polymer dispersion without any other treatment. The present invention provides a wet finishing method for a concrete skeleton that automatically obtains a mechanical key (anchor) effect in addition to an adhesive effect on a finishing material simply by mixing in a mortar.

[0011]

In order to achieve the above object,
This method of the invention, in applying the polymer dispersion as a primer to the surface of the concrete skeleton or the surface of the base mortar to be applied on it, in the polymer dispersion in advance, to mix and disperse the fine fibers, It is characterized (Claim 1).

Further, according to the present invention, fine fibers are added when the admixture material consisting of the polymer dispersion is mixed in the base mortar or tile mortar to be applied to the surface of the concrete skeleton (claim 2). .

Further, according to the present invention, when the admixture material consisting of the polymer dispersion is mixed in the base mortar or tile mortar to be applied to the surface of the concrete skeleton, the fine fibers are mixed and dispersed in the admixture material in advance. It is also possible (Claim 3).

[0014]

[Function] In the above wet finishing method, the fine fibers dispersed between the adhesive molecules in the primer are napped due to the formation of a film due to the aggregation of the adhesive molecules after the primer is applied to the concrete skeleton. Innumerable protrusions and protrusions are formed on the surface of the film due to raising. By applying mortar in this state, the mortar is firmly bonded and integrated by the mechanical key effect of the fine fibers together with the adhesive effect of the primer, and the stability of the adhesion is improved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

FIGS. 1 (a) to 1 (c) show a procedure for applying a surface finish according to the present invention. First, as shown in FIG. 1 (a), a primer made of polymer cement mortar is provided on the surface of a concrete skeleton 1. 2 is applied.

The primer 2 is composed of the above-mentioned EVAC-based polymer dispersion or the like, and the one in which fine fibers are mixed and dispersed in advance is used.

This microfiber has a trade name "Cerish" manufactured by Daicel Chemical Industries, Ltd.
Aramid fiber, acrylic fiber, vinylon fiber, carbon fiber, polyethylene fiber, polypropylene fiber, or natural fiber such as hemp is used.

After the application, when the solvent component scatters and the film of the primer 2 starts to form due to the cohesion of the molecules, the fine fibers dispersed by the cohesive force are exposed on the surface, as shown in FIG.
As shown in an enlarged manner in a part of (a), innumerable raised layers 3 are formed on the coating surface of the primer 2 in a protruding manner.

Next, as shown in FIG. 1 (b), when the base mortar 4 is applied to the surface of the primer 2, the adhesive interface of the base mortar 4 is, as shown in an enlarged view in a part of the figure, the primer 2 itself. In addition to the adhesive force, the mechanical keying effect of the napped layer 2a firmly bonds and integrates the base mortar 4 to the concrete skeleton 1 by a stable adhesive effect of so-called "combined glue nails".

Even when the mortar application time after the application of the primer 2 is delayed and the surface of the primer 2 is formed into a film, the mechanical key effect makes the peeling less likely to occur.

After the base mortar 4 is applied, as shown in FIG. 1 (c), the surface finishing layer 5 is applied to the surface of the base mortar 4 to complete the exterior work of the skeleton. The surface finishing layer 5 may be painted, or may be a tile attached with a mortar for attachment. In this case as well, by coating the primer 2 having the same composition as described above, a chemical keying effect and a mechanical key effect can be obtained.

Further, in place of the application of the primer 2, the admixture material consisting of the polymer dispersion is mixed into the base mortar 4 or the tiled mortar which is applied to the surface of the concrete skeleton 1, and the fine fibers 3 are preliminarily added to the admixture material. It is also possible to mix and disperse. Examples of this admixture include SBR-based and acrylic-based polymer dispersions, and the mixing of the fine fibers 3 can be expected to have a mechanical key effect and a mortar reinforcing effect as described above.

[0024]

As described above in detail with reference to the embodiments, in the invention according to claim 1, the fine fibers dispersed between the adhesive molecules of the primer are applied on the concrete skeleton or on it. After the primer is applied to the base mortar, it protrudes like a nap due to the film formation due to the aggregation of the adhesive molecules, and innumerable irregularities due to nap are formed on the surface of the film. The mechanical key effect of the microfibers has the advantage that the mortar can be firmly bonded and integrated to improve the stability of bonding. Further, in the present invention, the processing work for obtaining the above mechanical key effect is not necessary, and it is sufficient to simply apply the primer and then apply the mortar, which is advantageous in terms of man-hours.

Further, in the invention according to claim 2, when the moisture in the applied primer or mortar permeates into the already-cured and dried skeleton concrete surface or the underlying mortar surface, a minute amount of water is generated along with the moisture. Since the fibers also permeate, an anchor effect occurs on the coated surface side. Therefore, an anchor effect can be expected on both sides of the primer or mortar.

[Brief description of drawings]

1 (a) to 1 (c) are cross-sectional explanatory views showing a construction procedure for surface finishing according to the present invention.

[Explanation of symbols]

 1 Concrete frame 2 Primer 3 Raised layer 4 Base mortar 5 Surface finishing layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiro Asami 570-22 Himekawahara, Arai City, Niigata Prefecture (72) Inventor Masao Kawahara 1-10-4 Minamidai, Kawagoe City, Saitama Prefecture Within Shokubeton Japan Co., Ltd. (72) Inventor Mineo Takasu 1-10-4 Minamidai, Kawagoe City, Saitama Prefecture Within Shokubeton Japan Co., Ltd. (72) Inventor Miki Aoyama 4-640 Shimoseito, Kiyose City, Tokyo Metropolitan Institute of Technology Co., Ltd. (72) Inventor Rin Yoshi Original 4-640 Shimo-Seido, Kiyose-shi, Tokyo Inside the Obayashi Technical Research Institute, Inc. (72) Inventor Haruka Haruka, 4-640, Shimo-Seido, Kiyose-shi, Tokyo Inside the Obayashi Technical Research Institute (72) Inventor, Ito Mitani Kiyose, Tokyo 4-640 Ichishita-Seido, Obayashi Technical Research Institute Co., Ltd.

Claims (3)

[Claims] 1. When applying a polymer dispersion as a primer to the surface of a concrete skeleton or the surface of a base mortar to be applied on it, fine fibers are mixed and dispersed in the polymer dispersion in advance. Wet finishing method for concrete skeletons. 2. A wet finishing method for a concrete skeleton, which comprises adding fine fibers when the admixture material consisting of a polymer dispersion is mixed into a base mortar or a tiled mortar to be applied to the surface of a concrete skeleton. 3. When the admixture material consisting of a polymer dispersion is mixed into a base mortar or a tiled mortar to be applied to the surface of a concrete skeleton, fine fibers are mixed and dispersed in the admixture material in advance. Wet finishing method for concrete skeleton.