JP3312090B2 - Wet finishing method for concrete skeleton - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an adhesive between a concrete skeleton and a base mortar applied to the surface of the concrete skeleton,
The present invention relates to a wet finishing method for a concrete skeleton in which adhesion between a base mortar and a surface finishing material is improved.

[0002]

2. Description of the Related Art Generally, in a concrete skeleton structure, after the concrete is sufficiently dried, a base is prepared with mortar and the surface thereof is painted and finished, or the surface is finished by tiling.

FIG. 1 shows a cross-sectional structure in the case where tile finishing is performed as an exterior finish of a concrete body. In this construction procedure, first, in order to adjust the unevenness of the surface of the frame 1, the base mortar 2 is constructed, and then the tiles 4 are pasted through the mortar 3 for finishing.

[0004] At this time, conventionally, between the concrete skeleton 1 and the base mortar 2 or between the base mortar 2 and the tension mortar 4 of the tile 3, for example, Hiflex # 1000 (trade name) manufactured by Nippon Kasei Co., Ltd. Is applied as a primer 5.

[0005] This polymer dispersion is performed to prevent dryout of each interface and increase adhesiveness. In addition to coating, the polymer dispersion is mixed as an admixture in each mortar. In some cases.

[0006]

However, actually, the application time of the mortar after the application of the primer 5 is delayed.
If used incorrectly, depending on the concentration of the primer 5 and the properties of the coated surface, a polymer film layer will be formed at the interface, and consequently there is a problem that the adhesiveness is lowered and the mortar is easily peeled off.

[0007] In addition, in the case where a polymer cement mixed with the polymer dispersion is used in place of the coating operation, there have been cases where the same problem as described above occurs.

Incidentally, it is known to apply a permeable crystal growth agent to the surface of a concrete body, for example, as disclosed in Japanese Patent Publication No. Hei 5-27595, for the purpose of improving the water stopping property and preventing the deterioration of the concrete body. I have.

[0009] The crystal growth agent is applied or sprayed on the mortar surface, or filled into cracks,
It has the function of causing a chemical reaction with free lime in concrete to turn it into an insoluble dense crystal group, and penetrating into capillary voids by itself by multiple chain multiplication reactions, thereby suppressing the deterioration of concrete.

[0010] However, this crystal growth agent is considered to be used exclusively as a skeleton modifier, and its application and injection are performed before the wet finishing. Then it was not effective.

The present inventors have focused on the chemical reactivity of the above-described penetrable crystal growth agent and have conducted various studies on the enhancement of interfacial adhesion in wet finishing. The disadvantages of using the conventional polymer dispersion are as follows. It was confirmed that even at the stage where the polymer film layer was formed, it could penetrate into the interior from the mutual interface and improve the adhesiveness due to its chemical reactivity.

The present invention has been made on the basis of such knowledge, and has a higher adhesiveness and a stronger finished surface than any conventional wet finishing method. It is intended to provide a wet finishing method.

[0013]

In order to achieve the above object, according to the first aspect of the present invention, a polymer dispersion is provided as a primer on the surface of a concrete body or on the surface of a base mortar applied to the surface. On application, by mixing the permeable crystal growth agent in the polymer dispersion, in addition to the adhesive effect of the primer, by chemical bonding utilizing a chemical reaction by the permeable crystal growth agent, between the skeleton-mortar, Alternatively, the interface between the mortars is bonded.

According to the second aspect of the present invention, by mixing and dispersing the fine fibers in the polymer dispersion, not only the chemical adhesion effect of the primer and the permeable crystal growth agent but also the mechanical action of the fine fibers can be achieved. By the key effect, the mortars are firmly bonded and integrated.

According to the third aspect of the present invention,
Underlay mortar applied to the surface of concrete skeleton,
In mixing the admixture comprising the polymer dispersion into the tile-attached mortar, by mixing and dispersing the permeable crystal growth agent in the mortar, in addition to the adhesive effect of the polymer dispersion primer contained in the mortar, The chemical bonding utilizing the chemical reaction by the sexual crystal growth agent bonds the interface between the skeleton and the mortar or between the mortars.

[0016] In the invention according to claim 4 of the present invention,
By mixing and dispersing the fine fibers in the mortar,
In addition to the chemical bonding effect of the polymer dispersion and the penetrating crystal growth agent, the mortar is firmly bonded and integrated by the mechanical key effect of the fine fibers.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below in the case where a finishing material is tiled.

FIGS. 2A to 2C show the construction procedure of the present invention. The structure after construction is the same as the conventional one, but the material composition used is different and the physical structure is slightly different. The description is given with reference numerals.

First, as shown in FIG. 1A, a primer 10 is applied to the surface of the concrete skeleton 1.

The primer 10 is based on a conventionally used polymer dispersion of, for example, SBR type, epoxy type, ethylene vinyl acetate (EVAc) type and acrylic type, to which an osmotic crystal growth agent is appropriately added. And a fine fiber mixed and dispersed.

The mechanism of adhesion of the polymer dispersion is conventionally known, and therefore, the description thereof is omitted.

Further, as a function of the crystal growth agent, as described above, a chemical reaction occurs with the free lime in the concrete to convert it into an insoluble dense crystal group. It is a material having a function of permeating into concrete and suppressing the deterioration of concrete, and contains water glass, silica, magnesium silicate, a hydrophilic activator, a curing agent, slag, metakaolin, and the like as its reaction components.

The above-mentioned respective reaction components co-react with calcium hydroxide, which is unstable free lime, in the capillary void of the concrete frame, and undergoes a plurality of reaction steps to form the same fibrous crystal as the cement crystal. Calcium silicate,
It changes into insoluble stable crystals such as calcium silicate fluoride as equiaxed crystals and magnesium silicate as orthorhombic crystals, and has the property of filling the capillary space with these modified substances.

[0024] Among the reaction components of the crystal growth agent,
When using silica fume as the silica component,
Since these particles have a very small average particle size of 0.1 μm, there is an advantage that the reinforcing effect of the fine fibers works effectively.

Examples of the fine fibers include "Selish" (trade name) manufactured by Daicel Chemical Industries, Ltd., such as cellulose fiber, aramid fiber, acrylic fiber, vinylon fiber, carbon fiber, polyethylene fiber, polypropylene fiber, and hemp. Among them, artificial or natural fibers selected from the group consisting of cellulose fibers are used, and among them, cellulosic fibers having particularly high water retention are preferable because they hinder film formation.

The mixing ratio of the above-mentioned crystal growth agent and microfibers to the polymer dispersion is determined in consideration of the respective liquid properties, compatibility, dispersibility, etc., so that the mutual functions are not affected. Is set.

After the primer 10 having the above composition is applied, when the solvent component scatters and the film of the primer 10 starts to form due to the aggregation of molecules, the fine fibers dispersed by the aggregation force are exposed on the surface. 2 (a), an innumerable raised layer 12 is formed on the surface of the primer 10 to protrude from the surface of the primer 10, thereby preventing the formation of a polymer film.

Next, as shown in FIG. 2B, if the base mortar 2 is applied, the bonding interface of the base mortar 2 becomes
In addition to the adhesive force of the primer 10 itself, it is firmly bonded and integrated by the mechanical key effect of the brushed layer 12, and the so-called "glue and nail" effect allows the base mortar 2 to be integrated with the concrete body 1 by the stable bonding effect at the initial stage of bonding. Can be

At this point, the crystal growth agent does not immediately react with the base mortar 2, but the base mortar 2
Using the water in the solvent as a solvent, the crystal growth agent diffuses into the base mortar as shown by the dotted line in the figure, continues the chemical growth reaction through the above-described reaction steps, and increases the adhesive strength of the base mortar 2 to the concrete skeleton 1. It will increase sequentially.

After the foundation mortar 2 is applied, the tile 4 is applied through the tiled mortar 3 after applying the primer 10 having the same composition as above, thereby completing the exterior work of the frame.

At this time, the adhesion mechanism between the base mortar 2 and the tiled mortar 3 is the same as described above, and a strong adhesive force can be obtained at the interface between the two, and a material reaction is performed by the chemical reaction of the crystal growth agent. The adhesive force will be further increased with the increase in the adhesive strength.

In the above embodiment, the case where the finishing is applied to the tile is described. However, it is needless to say that the finishing can be applied to the painting.

In order to develop a mechanical key effect in the initial stage of bonding, fine fibers are mixed and dispersed in the primer. However, since the bonding effect by the chemical reaction of the crystal growth agent is improved in accordance with the renewal of the material example, the fine fibers are not necessarily fine. Needless to say, a two-component primer in which only a crystal growth agent is blended with the polymer dispersion without using fibers may be used.

Next, an embodiment in which the present invention is applied to a base mortar or a tiled mortar will be described.

First, a mortar having a normal water-cement ratio is selected. On the other hand, as the polymer dispersion as the admixture, for example, ethylene vinyl acetate-based, epoxy-based, SBR-based, and acrylic-based polymer dispersions are selected, and in addition, the crystal growth agent and the fine fibers are mixed and dispersed. .

As a mixing method, a crystal enhancer and a fine fiber may be mixed in advance in a polymer dispersion, and these may be added to the mortar during kneading, or may be added separately.

In this embodiment, it is not always necessary to add microfibers.

[0038]

As described in the above embodiments, in the present invention according to the first aspect of the present invention, in addition to the adhesive effect of the primer, the chemical bonding utilizing the chemical reaction of the osmotic crystal growth agent allows the frame to be formed. -Adhesion of the interface between mortars or between mortars is performed, so that stronger adhesion can be secured as compared with the conventional method, and the adhesive strength decrease due to film formation, which was a drawback of using polymer dispersion, is prevented. There is an advantage that can be prevented.

According to the second aspect of the present invention, in addition to the chemical bonding effect of the primer and the penetrating crystal growth agent, the mechanical key effect of the microfibers provides
Since the mortars are strongly bonded and integrated, there is an advantage that the adhesive strength can be further improved.

According to the third aspect of the present invention,
Similarly to the invention of claim 1, in addition to the adhesive effect of the polymer dispersion contained in the mortar, the interface between the skeleton and the mortar or between the mortars by a chemical bond utilizing a chemical reaction by the permeable crystal growth agent. Therefore, there is an advantage that a stronger adhesion can be ensured as compared with the conventional art, and a decrease in the adhesive strength due to the formation of a film, which is a drawback of using a polymer dispersion, can be prevented.

According to the fourth aspect of the present invention,
Similarly to the invention of claim 2, in addition to the chemical bonding effect of the polymer dispersion and the penetrating crystal growth agent, the mortar is firmly bonded and integrated by the mechanical key effect of the microfibers. There is an advantage that can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a completed state by tiling work as wet finishing.

FIGS. 2A to 2C are cross-sectional views showing a construction procedure of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete frame 2 Base mortar 3 Tiling mortar 10 Primer

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Naoki Inamura 3-8-1 Kasumigaseki, Chiyoda-ku, Tokyo Daicel Chemical Industries, Ltd. (72) Inventor Toshiyuki Asahina 230 Arai, Arai City, Niigata Prefecture (72) Inventor Kawahara Masao 1-10-4 Minamidai, Kawagoe-shi, Saitama Prefecture Shock Beton Japan Co., Ltd. (72) Inventor Takeshi Takeshi 4-640 Shimoseito, Kiyose-shi, Tokyo Japan Obayashi Corporation Technical Research Institute Co., Ltd. (72) Inventor Yoshimasa Hayashi 4-640 Shimoseito, Kiyose-shi, Tokyo Co., Ltd.Obayashi Gumi Technical Research Institute (72) Inventor Haruka Ogawa 4-640 Shimoseito, Kiyose-shi, Tokyo Co., Ltd.Obayashi Gumi Technical Research Co., Ltd. (72) Inventor Ichifusa Mitani Tokyo 4-640 Shimoseito, Kiyose-shi Obayashi Technical Research Institute Co., Ltd. (72) Inventor Yuji Saito 4, Shimoseito, Kiyose-shi, Tokyo No. 640 Obayashi Corporation Technical Research Institute Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) C04B 41/00-41/72

Claims (4)

(57) [Claims] 1. A method for applying a polymer dispersion as a primer to a surface of a concrete body or a surface of a base mortar applied to the surface of a concrete body, wherein a permeating crystal growth agent is mixed into the polymer dispersion. Wet finishing method for concrete skeleton. 2. The method according to claim 1, wherein fine fibers are mixed and dispersed in the polymer dispersion. 3. Mixing and dispersing a permeable crystal growth agent in the mortar when mixing an admixture consisting of a polymer dispersion with a base mortar or tile mortar applied to the surface of a concrete body. A characteristic wet finishing method for concrete skeletons. 4. The method according to claim 3, wherein fine fibers are mixed and dispersed in the mortar.