JP2005067921A - Surface structure of fair-faced concrete and method for finishing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface structure of fair-faced concrete in which the water proofing effect is improved, the durability is maintained and also the antifouling effect is improved by excellently forming a film on the upper surface even when the content of a water repellent material in a permeable water proofing material is increased, and a method for finishing the surface . <P>SOLUTION: A permeable water proofing material layer 2 containing about 25% alkyl alkoxy silane as the permeable water repellent material is formed on the surface 1a of the fair-faced concrete and a transparent self-cleaning layer 3 comprising titanium peroxide (TiO<SB>3</SB>) as a main ingredient and having high hydrophilicity is formed on the permeable water proofing material layer 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a surface structure of exposed concrete excellent in both waterproof effect and durability and a finishing method thereof.

  The exposed concrete is widely applied to buildings because the natural beauty and heavy taste of the material enhances the design, but the design is reduced due to deterioration due to aging and air pollution. There is a risk that. In order to avoid such inconveniences, various techniques as disclosed in, for example, Patent Document 1 have been conventionally proposed as a method for finishing a surface of exposed concrete.

In the above document, a technique for protecting the permeable waterproof material layer by applying a water-repellent permeable waterproof material to the surface of the exposed concrete and applying an emulsion-type transparent coating synthetic resin on the upper surface to form a film. Is disclosed. In other words, simply applying a permeable waterproof material would expose the waterproof layer directly to the outside air, resulting in poor durability. In addition to the waterproof effect, the waterproof effect was maintained for a long time.
Japanese Patent Publication No. 6-89589

  However, the conventional exposed concrete surface structure and its finishing method have the following problems. The water-repellent permeable waterproof material has a problem that the water-repellent component content must be less than desired because it is necessary to form a film by applying an emulsion-type transparent coating synthetic resin on the upper surface. there were. That is, the emulsion-type transparent coating synthetic resin is not sufficient, although it has a certain degree of adhesion to the permeable waterproof material, but it is not sufficient, and the desired amount of water-repellent component of the permeable waterproof material is required to exert a sufficient waterproof effect. When contained, there is a problem that good film formation cannot be achieved due to its high water repellency. In addition to such waterproofness and durability, the necessity of improving the antifouling effect has been increasing in recent years, and there has been a problem that it is not possible to sufficiently meet such needs.

  The present invention has been made in view of such circumstances, and even if the content of the water repellent material in the permeable waterproof material is increased, the waterproof effect is enhanced by causing the upper surface to form well. At the same time, it is an object of the present invention to provide a surface structure of exposed concrete that can maintain durability and improve antifouling effect, and a finishing method thereof.

  The invention according to claim 1 is formed on the surface of the exposed concrete and has a permeable waterproof material layer containing a permeable water repellent material, and is formed on the permeable waterproof material layer, and is transparent while containing titanium peroxide as a main component. And a self-cleaning layer having high hydrophilicity is formed.

  According to a second aspect of the present invention, in the surface structure of the exposed concrete according to the first aspect, a transparent photocatalyst layer is formed on the self-cleaning layer with anatase-type titanium oxide and titanium peroxide as main components. Features.

  According to a third aspect of the present invention, in the surface structure of the exposed concrete according to the first or second aspect, the water repellent material of the permeable waterproof material layer comprises a solution containing approximately 25% of alkylalkoxysilane. Features.

  According to a fourth aspect of the present invention, in the surface structure of exposed concrete according to any one of the first to third aspects, the self-cleaning layer is formed by adding lithium silicate. .

  The invention according to claim 5 is an osmotic waterproof material application step in which a permeable water repellent material is released and applied to a concrete surface to form a permeable waterproof material layer, and an infiltration formed by the permeable waterproof material application step. And a self-cleaning material application step of forming a self-cleaning layer by applying a transparent and highly hydrophilic self-cleaning material containing titanium peroxide as a main component on the water-resistant waterproof material layer.

  According to a sixth aspect of the present invention, in the surface finishing method for exposed concrete according to the fifth aspect of the invention, the self-cleaning layer formed by the self-cleaning material application step is transparent with anatase-type titanium oxide and titanium peroxide as main components. It has the photocatalyst material application | coating process which apply | coats a photocatalyst material and forms a photocatalyst layer, It is characterized by the above-mentioned.

  The invention according to claim 7 is the surface-finishing method for exposed concrete according to claim 5 or claim 6, wherein the water repellent material used in the permeable waterproof material coating step contains approximately 25% of alkylalkoxysilane. It consists of the solution which was made.

  The invention according to claim 8 is the surface finishing method for exposed concrete according to any one of claims 5 to 7, wherein the self-cleaning material used in the self-cleaning material application step is lithium silicate. It is characterized by consisting of what added.

  According to the invention of claim 1 and claim 5, self-cleaning mainly composed of titanium peroxide having high adhesion and high hydrophilicity on the upper surface of the permeable waterproof material layer containing the permeable water repellent material. As a layer is formed, even if the content of water repellent material in the permeable waterproof material is increased, it is possible to improve the waterproof effect and maintain durability by making the upper surface of the film well formed. And the antifouling effect can also be improved.

  According to the second and sixth aspects of the invention, since the upper surface of the self-cleaning layer contains titanium peroxide with good adhesion, it contains anatase-type titanium oxide that can decompose organic substances when reacted with light. In addition to improving the effect and maintaining the durability, it is possible to obtain an exposed concrete surface that can further improve the antifouling effect.

  According to the invention of claim 3 and claim 7, since the water repellent material of the permeable waterproof material layer is composed of a solution containing about 25% of alkylalkoxysilane, the adhesion with the self-cleaning layer can be further improved. And the construction cost can be reduced.

  According to the invention of claim 4 and claim 8, since the self-cleaning layer is made of lithium silicate added, the hydrophilicity of the self-cleaning layer can be further improved, and the antifouling effect is further enhanced. Can do.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The exposed concrete applied to the first embodiment is constructed as a wall surface in a housing such as a building, for example, and its surface penetrates into the surface 1a of the exposed concrete 1 as shown in FIG. And a self-cleaning layer 3 formed on the upper surface thereof.

  In order to obtain the surface structure of the exposed concrete as described above, first, the dirt adhering to the exposed concrete surface 1a is removed with a high-pressure water washing machine or the like, and the surface 1a is dried. Apply a polymer cement mortar or the like. As a result, the exposed concrete surface 1a is in a smooth state, avoids a state in which a dense portion having poor water absorption and a fragile portion having high water absorption are mixed, and absorbs water over the entire surface 1a. It can be made uniform while lowering.

  The polymer cement mortar used here is preliminarily colored in the same manner as the casing around the portion to be treated (that is, the portion where the sand streaks are formed). Is now finished without a sense of incongruity. Even if repair and repair are performed as described above, polymer cement mortar or the like is only filled in the minute recesses formed in the so-called fragile site called sand streaks, so that a layer of uniform thickness is applied to the surface 1a of the exposed concrete. Is not formed.

  Thereafter, a permeable water repellent material is applied over the entire surface 1a of the exposed concrete 1 after the repair treatment, and the permeable waterproof material layer 2 is formed on the inner side of the surface 1a of the exposed concrete 1 (permeability). Waterproofing material application process). The water-repellent material applied here is made of a solution containing approximately 25% of alkylalkoxysilane, and has a water-repellent effect sufficiently enhanced as compared with a conventional water-repellent material. It is preferable to use the trade name NY-101 manufactured by Nichiei Yoshida Co., Ltd. as the water repellent material.

  Here, the reason why the content of the alkylalkoxysilane as the water repellent material in the penetration waterproofing material layer 2 is set to about 25% is based on the following experimental results. In the experiment, the content of the alkylalkoxysilane is 10%, 20%, 25% and 30% with respect to the surface of the fence board concrete (test piece) having a specific gravity of 2.33 at room drying and constant temperature, respectively. These were applied and those that were not waterproofed were prepared. And each test piece was immersed in room temperature water, and the amount of water absorption in 1, 3, 6, 24, and 48 time point was measured, respectively. At the time of measurement, the adhered water on the surface of the test piece was sucked with a squeezed wet towel and then weighed. The experimental results are shown in Table 1 below. The water absorption rate (%) = {(water absorption amount) / (weight of test piece before immersion)} × 100.

  As apparent from Table 1 above, those containing 25% of alkylalkoxysilane are superior in water-repellent effect with little increase in water absorption over time compared to those containing less than that. In addition, it can be seen that even if 30% of alkylalkoxysilane is contained, there is not much difference in water repellency from that containing 25%. That is, if 25% of alkylalkoxysilane is contained, the maximum water repellent effect can be obtained, and even if the content is increased further, the water repellent effect does not change so much. Therefore, it is most preferable to use a water repellent material containing approximately 25% of alkylalkoxysilane in order to sufficiently improve the water repellent effect and suppress construction costs.

Then, the permeable waterproof material layer 2 is dried cured, it forms a self-cleaning layer 3 is coated with a transparent and highly hydrophilic self-cleaning material with a main component titanium peroxide (TiO ₃₎ on its upper surface (Self-cleaning material application process). Microscopically, as shown in FIG. 2, the titanium peroxide in the self-cleaning layer 3 penetrates into the surface 1a of the exposed concrete 1 and the pinholes 1b and capillaries 1c formed on the surface 1a. It adheres mainly to the components of CaO, Al ₂ O ₃ and Fe ₂ O _{3 in} the cured cement paste that has not reacted with the alkylalkoxysilane of the waterproof material layer 2 to form a colorless and transparent hydrophilic thin film. .

  That is, the self-cleaning layer 3 can be firmly adhered to the upper surface of the permeable waterproof material layer 2 made of super-water-repellent alkylalkoxysilane by the above reaction, and the permeable waterproof material layer 2 can be protected. The waterproof effect can be maintained and the durability can be improved. In addition, since the self-cleaning layer 3 is made of a highly hydrophilic self-cleaning material mainly composed of titanium peroxide, it is possible to flow dirt and the like adhering to the surface together with rain water, etc. during rain, Self-cleaning property can be exhibited. More specifically, the antifouling effect is improved because it enters between the dirt to which rainwater or the like is attached and the surface of the self-cleaning layer 3 and peels off and flows down together.

  Therefore, by forming the self-cleaning layer 3 mainly composed of titanium peroxide, even if the content of the water repellent material (alkylalkoxysilane) in the permeable waterproof material is increased to approximately 25% as in this embodiment. By forming the upper surface well, the waterproof effect can be enhanced and the durability can be maintained, and the antifouling effect can also be improved. The self-cleaning layer 3 exhibits an action as a so-called barrier layer inactive to light, and is different from the photocatalyst containing anatase-type titanium oxide used in the second embodiment. As the self-cleaning material constituting the self-cleaning layer 3, for example, the trade name NY-Ceraclean manufactured by Nichiei Yoshida Co., Ltd. is preferably used.

  Furthermore, it is preferable to add a predetermined amount (for example, about 1 to 5% by weight) of lithium silicate to the self-cleaning material constituting the self-cleaning layer 3. By adding such lithium silicate, the hydrophilicity of the self-cleaning layer 3 can be further improved, and the antifouling effect can be further improved. Although potassium silicate may be added instead of lithium silicate, lithium silicate is preferred because of poor water resistance.

Next, a second embodiment according to the present invention will be described.
As in the first embodiment, the exposed concrete applied to the second embodiment is constructed as a wall surface of a housing such as a building, and the surface thereof is exposed concrete 1 as shown in FIG. And a self-cleaning layer 3 formed on the upper surface thereof, and a photocatalyst layer 4 formed on the self-cleaning layer 3. The same layers as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In order to obtain the exposed concrete surface structure as described above, after the surface 1a is cleaned and repaired as in the first embodiment, the permeable waterproof material layer 2 and the self-cleaning layer 3 are sequentially formed. Then, after confirming that the self-cleaning layer 3 formed by the self-cleaning material application process has been dried and cured, a transparent photocatalyst material is formed on the self-cleaning layer 3 with anatase-type titanium oxide and titanium peroxide as main components. Application is performed to form the photocatalyst layer 4 (photocatalyst material application step).

  The photocatalyst layer 4 is firmly fixed to the self-cleaning layer 3 as a titanium peroxide thin film by the titanium peroxide contained therein, and the antifouling property can be improved by the anatase type titanium oxide. In other words, anatase-type titanium oxide is activated by ultraviolet rays from the sun to generate active oxygen, and has the effect of oxidatively degrading organic soils adhering to its surface to transform it into a water-soluble or water-dispersible substance. Have. And in the case of rain, the altered oxidative degradation product flows down together with rain water, etc., so that the antifouling effect can be improved, and the surface of the exposed concrete 1 should maintain the appearance of the new construction over a long period of time. Can do it.

  Therefore, according to the present embodiment, as in the first embodiment, the waterproof effect can be enhanced and the durability can be maintained, and the antifouling effect can be further improved. In addition to the improvement of the antifouling effect, the antibacterial action can be exhibited by the oxidative decomposition action of the anatase type titanium oxide. As in the first embodiment, a predetermined amount (for example, about 1 to 5% by weight) of lithium silicate may be added to the self-cleaning material forming the self-cleaning layer 3.

  According to the first embodiment and the second embodiment, the permeable waterproof material layer 2, the self-cleaning layer 3 and the photocatalyst layer 4 formed on the surface 1a of the exposed concrete 1 are all made of an inorganic material. As a result, there will be no glazing caused by repeated coating, and the design of the exposed concrete 1 will not be impaired. In particular, the self-cleaning layer 3 is rich in air permeability in addition to antifouling properties.

  As mentioned above, although this embodiment was described, this invention is not limited to these, For example, the water-repellent material contained in a permeable waterproof material layer is replaced with the alkyl alkoxysilane, and the material which fulfills other water-repellent functions. It is good. The content of alkylalkoxysilane is most preferably about 25%, but other content may be used as long as the waterproof effect can be maintained. In the present embodiment, the surface 1a is cleaned and repaired before the permeable waterproof material layer 2 is formed. However, these steps may be omitted or other preliminary steps may be performed.

  The exposed concrete can be applied to other building parts constructed on the ceiling surface, floor surface, etc. in addition to the wall surface of the building.

The schematic diagram which shows the surface structure of the exposed concrete which concerns on the 1st Embodiment of this invention Schematic diagram for explaining the fixing action between the permeable waterproof material layer and the self-cleaning layer The schematic diagram which shows the surface structure of the exposed concrete which concerns on the 2nd Embodiment of this invention

Explanation of symbols

1 Exposed concrete 1a Surface 2 Permeable waterproofing material layer 3 Self-cleaning layer 4 Photocatalyst layer

Claims (8)

A permeable waterproofing material layer formed on the exposed concrete surface and containing a permeable water repellent;
A self-cleaning layer that is formed on the permeable waterproof material layer and is transparent and highly hydrophilic while containing titanium peroxide as a main component;
Surface structure of exposed concrete, characterized in that is formed.   2. The surface structure of exposed concrete according to claim 1, wherein a transparent photocatalyst layer is formed on the self-cleaning layer, with anatase-type titanium oxide and titanium peroxide as main components.   The surface structure of exposed concrete according to claim 1 or 2, wherein the water repellent material of the permeable waterproof material layer comprises a solution containing approximately 25% of alkylalkoxysilane.   The surface structure of exposed concrete according to any one of claims 1 to 3, wherein the self-cleaning layer is made of a material to which lithium silicate is added. A penetrating waterproof material application process in which a penetrating water repellent material is released and applied to the concrete surface to form a penetrating waterproof material layer;
Self-cleaning material application process for forming a self-cleaning layer by applying a transparent and highly hydrophilic self-cleaning material mainly composed of titanium peroxide on the permeable waterproof material layer formed by the permeable waterproof material application process When,
A surface finishing method for exposed concrete, comprising:   A photocatalyst material application step of forming a photocatalyst layer by applying a transparent photocatalyst material mainly containing anatase-type titanium oxide and titanium peroxide on the self-cleaning layer formed by the self-cleaning material application step. The surface finishing method for exposed concrete according to claim 5.   7. The surface-finishing method for exposed concrete according to claim 5, wherein the water-repellent material used in the permeable waterproof material coating step comprises a solution containing approximately 25% alkylalkoxysilane.   The surface finish of exposed concrete according to any one of claims 5 to 7, wherein the self-cleaning material used in the self-cleaning material application step comprises a lithium silicate added. Method.

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