JPH06240845A - Executing method of facing material by baked article having large water absorption - Google Patents

Abstract

PURPOSE:To prevent an efflorescence generated on a facing material using a baked article such as a brick employed for the finishing coating of an external wall surface as a material by pasting mortar and a method of curing. CONSTITUTION:The external wall surface 11 of concrete, to which backing treatment is conducted, is covered with a polymer dispersion. The external wall surface is plastered with the kneaded mortar of the polymer dispersion and active silica, thus forming a mortar layer 13 in required thickness. Facing materials 1 by baked articles such as bricks having water absorption are pushed and pasted on the mortar layer 13 so that parts of kneaded mortar are swollen on joints 14 among the facing materials. The upper sections of the facing materials are covered with a sheet 16 for preventing water immersion, and the mortar layer is cured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of applying an exterior material made of a fired material such as brick having a large water absorption rate as a coating for finishing a concrete building.

[0002]

2. Description of the Related Art In the construction of ordinary pasted tiles on a concrete wall, mortar is applied to the wall surface that has been subjected to a base treatment such as removal of fragile parts, and the tiles are pressed against the mortar and pasted between the tiles. Filled with joint material and fixed.

[0003]

In the ordinary laminated tile used for coating the outer wall, efflorescence is unlikely to occur even after a long period of time, and the tile is stained with white stains to improve the appearance of the building. Although it does not spoil the characteristics, the exterior material made of fired material with a high water absorption rate, such as bricks, causes white sinter in a short period of time, impairing the unique color tone of the exterior material. Even the construction may be different from when it was built.

[0004] Generally, the occurrence of efflorescence is caused by the leaching of water-soluble components in the cement composition, and it is said that efflorescence is more likely to occur in a fired product having a higher water absorption. Therefore, even if a brick is used as the material, if the water absorption rate is low, the occurrence of white sinter is prevented, but with an exterior material made of a brick manufactured with a low water absorption rate, the density and hardness increase irrespective of the color tone. Since the rough surface peculiar to bricks is lost and the tiles become close to the pasted tiles, giving the impression of a tile simulating bricks, it was difficult to use as an exterior material having the taste of bricks.

The leaching of the water-soluble component is caused by the presence of water from the inside and outside. Therefore, as a preventive measure, a water repellent material is applied to the exterior material to prevent water absorption and water permeation. It is also possible to prevent sinter, but bricks with a high water absorption rate are porous and remarkably absorb the water repellent material. In addition, there is a limit to the prevention of water permeation, and further impregnation causes another problem that the water repellent material adheres to the back surface and impairs the adhesion with the mortar. It was a thing.

The object of the present invention is to solve the problem of white liquor, which is likely to occur in the exterior material due to a fired product having a high water absorption rate, by means of the applied mortar and the curing method, and its construction is also compared with the conventional method. Therefore, it is to provide a new exterior material construction method which is not particularly complicated and can be easily performed by a normal tile construction technique.

[0007]

According to the present invention according to the above object, a polymer dispersion is applied to an outer wall surface of a concrete which has been subjected to a base treatment, and the outer wall surface is coated with a kneading mortar with the polymer dispersion and activated silica. To form a mortar layer of the required thickness, and press the mortar layer with an exterior material made of a fired material such as brick with a high water absorption rate, pressing it so that part of the kneading mortar rises up into the joints between the exterior materials. After that, the exterior material is covered with a sheet for preventing water infiltration to cure the exterior material, thereby preventing whitening of the exterior material.

In the present invention, it is preferable to wet the exterior material with water before applying it, and the application of the exterior material is carried out by thoroughly rubbing it with an impact tool, and the kneading mortar raised in the joints by the rubbing. It is preferable to fill the joint material while extruding it from the tube.

As the polymer dispersion, a polymer having a long open time, good workability, and excellent durability and adhesiveness, for example, ethylene vinyl acetate emulsion and acrylic resin used as a cement admixture. A system emulsion, synthetic rubber latex, etc. can be used.

[0010]

[Operation] In the above-mentioned construction method, the application of polymer dispersion increases the adhesive strength between the base and the mortar layer, and the coating layer on the surface of the base prevents the water in the mortar from seeping out to the base side, and the kneading mortar The water retention is increased by the polymer dispersion dispersed therein, and the exudation of mortar water into the exterior material and the water leakage into the mortar layer such as rainfall through the exterior material are prevented.

Furthermore, the reaction between the mixed active silica and mortar water densifies the mortar layer, the strength of the mortar layer is further increased, and the water-soluble component in the mortar is less likely to seep out. In combination with such a hydration reaction and the above-mentioned action, this construction method can prevent stains due to white liquor, which tends to occur on the exterior material made of a fired product having a high water absorption rate, for a long period of time.

[0012]

[Examples] The construction of exterior materials made of bricks for walls will be described below. This brick is hand-made and has a rough surface as a whole, with remarkable surface irregularities and a water absorption rate of 10.2%.
And it's bigger than normal pasted tiles. As shown in FIG. 1 (A), the exterior material 1 used in this embodiment is divided into three bricks, and only two pieces on both sides are used in order to use the uneven surface peculiar to the brick as a surface. Type A to do,
Further, as shown in FIG. 1 (B), there are two types of type B, which are divided at the central portion. For construction, type A and type B are alternately stuck on top and bottom as shown in FIG. Done.

In such an exterior material 1, since the material is porous and has a high water absorption rate, it absorbs the moisture of the adhesive mortar to reduce the adhesive strength, so that it is preferable to wet it beforehand.

As for the concrete outer wall 11 as the base, after the base treatment such as removing the fragile portion of the concrete surface, adjusting the unevenness, and cleaning with water, polymer dispersion is applied to the concrete surface to form an adhesive reinforcement layer on the concrete surface. 12
To form. After applying the adhesion reinforcing layer 12, the same polymer dispersion (10%) and activated silica (3%) as above.
The mortar kneaded with and is applied to the concrete surface about twice to form a mortar layer 13 having a thickness of about 5 mm, and then the exterior material 1 is applied.

For the attachment, the uneven surface of the surface is directed downward, and the flat cut surface on the back side is pressed against the mortar layer 13,
The kneading mortar is performed by applying a pressing force such that a part of the kneading mortar rises to the joint 14 having a width of 7 to 10 mm or more between the exterior materials. In addition, when applying the mortar similar to the above-mentioned kneading mortar to the back side of the exterior material 1 at the time of application, the adhesiveness is increased and the mortar is easily piled up on the joint 14.

Further, an impact tool is applied to the surface of the attached exterior material 1 to apply the exterior material 1 to the mortar layer 13 sufficiently (3 mm
Rub down). As a result, the kneading mortar is pushed into the small holes in the exterior material, and the exterior material 1 is reliably attached to the wall surface.

Once the required amount of exterior material 1 has been attached,
After curing for 2 days, the joint material 15 having waterproofness and adhesiveness is filled. When a trowel or the like is used for this filling, the protruding joint material 15 adheres to the surface of the exterior material 1 and becomes dirty,
Further, since the dirt remains because the joint material 15 is clogged in the fine holes of the exterior material 1, it cannot be removed by cleaning later and remains as dirt for a long time. Therefore, a nozzle is provided to prevent such a situation. The joint material 15 is filled while being extruded from the tube. After filling, the surface is pressed down with a joint trowel to finish. The texture of the finish can be finished in any shape.

After filling the joint material 15, the mortar is cured. This curing is performed for about 14 days by covering the entire outer wall on which the exterior material 1 has been constructed with the synthetic resin sheet 16 in order to prevent water retention of the mortar and dissolution and leaching of water-soluble components due to flooding from the outside such as rainfall. To do.

The exterior material 1 adhered to the wall surface by the mortar layer 13 has a problem of strength, and therefore the concrete outer wall 1
Since it is also susceptible to cracks caused by unexpected cracks generated in No. 1, it is preferable to provide expansion joints 17 on the concrete outer wall 11 at regular intervals in order to prevent this.

As the seal 18 of the elastic joint 17,
It is preferable to seal modified silicone as the primary seal and polyurethane as the secondary seal, and the exterior material 1 so that the joint 15 is located on the expansion joint 17 thereof.
Perform the construction of.

[0021]

As described above, according to the present invention, the exudation of the water-soluble component at the time of construction is achieved by the adhesion reinforcing layer on the outer wall surface by the polymer dispersion and the mortar layer by the kneading mortar with the polymer dispersion and the activated silica. Prevent,
In addition, since the water-soluble component was prevented from being dissolved due to water immersion from the outside by curing with a sheet for preventing water infiltration, even if the exterior material is a fired product with a high water absorption rate, the The phenomenon does not occur.

Further, by moistening the exterior material before pasting, even if the exterior material is a fired product having a high water absorption rate,
Since the absorption of water in the mortar is prevented, the incomplete hydration reaction due to insufficient water content is prevented, and the exterior material with a flat back surface is obtained by thoroughly rubbing the exterior material with an impact tool. However, the bond with the mortar becomes very close, it is robust even if it is exposed to wind and rain for a long time, the white flower phenomenon does not occur, and the unique taste of the exterior material is not lost.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which two types of exterior materials used in the construction method of the present invention are made from bricks.

FIG. 2 is a partial front view of an outer wall on which two types of exterior materials are applied.

FIG. 3 is an explanatory view showing a state in which a mortar layer is applied on the adhesion reinforcing layer formed on the outer wall surface.

FIG. 4 is an explanatory diagram showing a state in which a mortar layer exterior material is attached.

FIG. 5 is an explanatory diagram showing a curing state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exterior material 2 Brick 11 Concrete outer wall 12 Adhesion reinforcement layer 13 Mortar layer 14 Joint 15 Joint material 16 Sheet of synthetic resin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Soujiro Sugiyama, 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Co., Ltd. (72) Teruo Kondo 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd.

Claims (4)

[Claims] 1. A polymer dispersion is applied to an outer wall surface of a concrete which has been subjected to a base treatment, and a kneading mortar with polymer dispersion and activated silica is applied to the outer wall surface to form a mortar layer having a required thickness. The mortar layer has an exterior material made of a fired material such as brick with a large water absorption rate.
After a part of the kneading mortar is pressed and attached so that it rises in the joints between the exterior materials, it is cured by covering the exterior material with a sheet for preventing water infiltration. Exterior material construction method. 2. The method for constructing an exterior material with a fired product having a high water absorption rate according to claim 1, wherein the exterior material is moistened with water before sticking. 3. The method for constructing an exterior material with a fired product having a high water absorption rate according to claim 1, wherein the joint material is filled into the joint while extruding it from a tube. 4. The method for applying an exterior material with a fired product having a high water absorption rate according to claim 1, wherein the attachment of the exterior material is carried out by sufficiently kneading with an impact tool.