JP2015101512A - Outer wall structure for single-family housing and construction method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outer wall structure for a single-family housing excellent in designability and durability.SOLUTION: There is provided an outer wall structure containing (A) a woody ground, (B) a waterproof paper, (C) metal lath, (D-1) ground mortal containing 20 to 117 pts.mass of a fine aggregate having a ratio of a lightweight fine aggregate to 100 pts.mass of cement of 0.04 to 0.62 and 11 to 40 pts.mass of a polymer in terms of solid, (D-2) alkali resistant fiver mesh textile, (E) a finishing agent containing 230 to 360 pts.mass of the fine aggregate, 2 to 6 pts.mass of an expansive admixture, 3 to 5 pts.mass of metakaolin, 0.07 to 0.70 pts.mass of a silane-based water repellent and 3 to 17 pts.mass of the polymer in terms of solid based on 100 pts,mass of the cement and (F) a high durability finishing coating agent and constructed by (A), (B), (C), (D-1), (E) and (F) in this order with (D-2) included in (D-1).

Description

  The present invention relates to an outer wall structure of a detached house.

  In recent years, the durability of detached houses has been greatly improved by improving earthquake resistance, improving the quality of materials used, and improving design techniques. For example, it is known that ground subsidence measures, seismic isolation structures using damping dampers, and seismic reinforcement for columns and walls are effective in significantly improving durability. On the other hand, lath mortar made of metal lath and lightweight cement mortar, extruded cement board, or the like is used without changing the outer wall structure of a detached house. When lath mortar is used for the outer wall structure, a construction method using a lightweight cement mortar with a sand alcohol ratio adjusted to improve crack resistance and a lower alcohol-based shrinkage reducing agent is devised (Patent Literature) 1). Moreover, when using an extrusion-molded cement board for an outer wall structure, the construction method which uses the lightweight mortar which mixed the polymer for the extrusion-molded cement board as a foundation | substrate of finishing material is devised (patent document 2).

On the other hand, the cement-based finishing material used for the outer wall structure of detached houses is coated with acrylic paint and measures are taken to prevent neutralization. It has become a challenge.
In order to prevent deterioration of the outer wall structure due to organic gas, mold, and algae, a coating liquid made of photocatalyst particles made of metal oxide, a silicone emulsion, and a water-soluble silver compound has been devised (Patent Document 3).

Japanese Patent Laid-Open No. 2003-119063 JP 2003-82834 A JP 2011-21396 A

However, the construction methods such as Patent Documents 1 and 2 have not been able to obtain a sufficient effect as a countermeasure for reducing cracks generated due to the influence of window glass and sash. In addition, light-weight mortar and metal lath mortar mortar may have insufficient bending rigidity against deformation caused by earthquakes that frequently occur in recent years. Extruded cement board lacks joint bending strength and crack resistance. there is a possibility.
Furthermore, the coating liquid described in Patent Document 3 is not effective in improving the crack resistance of the substrate.
On the other hand, spray lysine, cement stucco, scraping finish, etc. have been conventionally constructed as finishing materials for the outer wall structure for detached houses. In order to improve rainwater penetration, neutralization, etc., acrylic paint was applied and durability was improved, but metal lath rust was generated due to cracking due to drying shrinkage, leading to deterioration of durability. There was a problem. Furthermore, even if these problems were solved and a cement-based finishing material excellent in formability was developed, the antifouling property and the algaeproofing property were not improved. The cause of soiling of cement-based finishing materials is thought to be largely due to the local environment of the constructed housing. The causes of dirt on the outer walls of houses in urban areas are thought to be organic gas, mold, and algae, and the causes of dirt on the outer walls of houses in coastal areas are considered to be sand, earth, and seawater components. The cause is thought to be dust and dirt. In this way, the cause of dirt varies depending on the local environment. Conventionally, in order to improve the antifouling and algal resistance, it is necessary to select a paint to be applied to the cementitious finish according to the cause of the dirt. It was.
Therefore, the subject of this invention is providing the outer wall structure of the detached house excellent in the designability and durability.

  Therefore, the present inventors have made various studies in order to develop an outer wall structure of a detached house that satisfies both designability and durability, and as a ground mortar excellent in crack resistance, waterproofness, and neutralization prevention, A fine aggregate with a light-weight fine aggregate ratio and a mortar containing a polymer is used, and an alkali-resistant fiber mesh fabric is encased in the base mortar (sinking down), resulting in excellent formability and durability. Adopt a finishing material containing fine aggregate, expansion material, metakaolin, silane water repellent and polymer as the material, and apply a highly durable finish paint with excellent self-cleaning performance and antifouling and algal resistance. For example, the present inventors have found that an outer wall structure of a detached house excellent in design and durability can be obtained, and completed the present invention.

That is, the present invention provides the following [1] to [6].
[1] (A) Woody base, (B) Waterproof paper, (C) Metal lath, (D-1) Fine bone whose ratio of lightweight fine aggregate is 0.04 to 0.62 with respect to 100 parts by mass of cement A base mortar containing 20 to 117 parts by mass of a material and 11 to 40 parts by mass of a polymer in terms of solid content, (D-2) an alkali resistant fiber mesh fabric, (E) 230 fine aggregates with respect to 100 parts by mass of cement. 360 parts by mass, 2-6 parts by mass of an expansion material, 3-5 parts by mass of metakaolin, 0.07-0.70 parts by mass of a silane-based water repellent and 3-17 parts by mass of polymer in terms of solid content And (F) a highly durable finish paint, (D-2) is included in (D-1), (A), (B), (C), (D-1 ), (E), and (F).
[2] (F) The highly durable finish paint is at least one selected from the group consisting of modified siliceous paints, urethane paints, silicon paints, fluorine paints and acrylic silicon paints. The outer wall structure of a detached house.
[3] (D-1) In the base mortar layer, (D-2) the alkali-resistant fiber mesh fabric is included at a position of 0.5 to 3 mm from the boundary between (D-1) the base mortar and (E) the finishing material. The outer wall structure of a detached house according to [1] or [2].
[4] The outer wall structure of a detached house according to any one of [1] to [3], wherein the finishing material cement is white cement.
[5] (E) With respect to 100 parts by mass of cement, the finishing material has a particle size of 600 to 2500 μm of 35 to 50% by mass, a particle size of 300 to 600 μm of 30 to 45% by mass, and a particle size of less than 300 μm of 25% by mass or less. The outer wall structure of a detached house according to any one of [1] to [4], comprising 230 to 360 parts by mass of fine aggregate, which is configured with a particle size.
[6] (A) Wood base, (B) waterproof paper, (C) metal lath, (D-1) fine lightweight aggregate with a ratio of 0.04 to 0.62 for 100 parts by mass of cement A base mortar containing 20 to 117 parts by mass of an aggregate and 11 to 40 parts by mass of a polymer in terms of solid content, (D-2) an alkali-resistant fiber mesh fabric, and (E) a fine aggregate for 100 parts by mass of cement. 230 to 360 parts by mass, 2 to 6 parts by mass of an expanding material, 3 to 5 parts by mass of metakaolin, 0.07 to 0.70 parts by mass of a silane-based water repellent, and 3 to 17 parts by mass of a polymer in terms of solid content A finishing material to be contained, and (F) a method for constructing an outer wall structure of a detached house on which a highly durable finish paint is applied, wherein (D-2) is included in (D-1). The construction method of the outer wall structure of a detached house.

  The outer wall structure of the detached house of the present invention is excellent in design and durability for a long period of time regardless of the housing construction area.

It is an attachment figure which shows an example of the outer wall structure of the detached house of this invention. It is a side view which shows an example of the outer wall structure of the detached house of this invention. It is a figure which shows the outline | summary of a bending test. It is a figure which shows a bending strength test result (Example). It is a figure which shows a bending strength test result (comparative example).

  In the outer wall structure of the detached house of the present invention, the ratio of the lightweight fine aggregate to 0.04 to 100 parts by mass of (A) wood base, (B) waterproof paper, (C) metal lath, and (D-1) cement. A ground mortar containing 20 to 117 parts by mass of fine aggregate of 0.62 and 11 to 40 parts by mass of polymer in terms of solid content, (D-2) an alkali-resistant fiber mesh fabric, (E) 100 parts by mass of cement 230 to 360 parts by mass of fine aggregate, 2 to 6 parts by mass of expansive material, 3 to 5 parts by mass of metakaolin, 0.07 to 0.70 parts by mass of silane water repellent and polymer as solid content And (F) a highly durable finish paint, (D-2) is included in (D-1), (A), (B), ( C), (D-1), (E), and (F).

  As the (A) wood base of the outer wall structure of the detached house of the present invention, a wooden base made of pillars, studs, and structural plywood can be used.

  The waterproof paper (B) of the outer wall structure of the present invention can be used as long as it has “asphalt felt 430”, “modified asphalt felt” conforming to JIS A6005 (asphal roofing felt), or those having waterproof performance equivalent to or better than these. It is.

The (C) metal lath of the outer wall structure of the present invention conforms to JASS15M-101 “Quality standard for lath-based steel metal mesh” and can be used if it has a mass of 700 g / m ² or more. For example, a metal lath corrugation No. 1 or a W lath with a hard bone can be used.

  The (D-1) base mortar of the outer wall structure of the present invention is a lightweight mortar having the above composition. The lightweight mortar contains a fine aggregate and a polymer. Examples of the cement used for the base mortar include commercially available Portland cement and special cement.

  The fine aggregate used in the (D-1) base mortar of the outer wall structure of the present invention is preferably a combination of a normal aggregate and a lightweight aggregate. The ordinary aggregate may be any material that can be used for mortar and concrete, and examples thereof include commercially available quartz sand, cryolite, limestone sand, river sand, sea sand, mountain sand, crushed sand, and the like. For example, trade names “Yamagata Silica No. 5” manufactured by Maeda Construction Materials Industries Co., Ltd., trade names “Kashima Silica Sand No. 6” and “Kashima Silica No. 7” manufactured by Takano Shoji Co., Ltd. No. "," Hakuryu 1 "manufactured by Asahi Minesue Co., Ltd., and the like. Further, as the lightweight aggregate, for example, an organic lightweight aggregate such as EVA foam aggregate or styrene foam aggregate or a natural or artificial inorganic lightweight aggregate can be used.

  The fine aggregate is contained in an amount of 20 to 117 parts by mass with respect to 100 parts by mass of cement from the viewpoints of thick coatability and iron workability. A preferable amount of fine aggregate is 20 to 115 parts by mass with respect to 100 parts by mass of cement. If it is less than 20 parts by mass, it will be difficult to ensure an appropriate thickness as the base mortar, and the shrinkage amount will be large, which may cause cracks. On the other hand, if it exceeds 117 parts by mass, the strength reduction is increased and the workability of the iron is reduced. The ratio of the lightweight fine aggregate in the fine aggregate is 0.04 to 0.62. If the ratio of the lightweight fine aggregate is less than 0.04, the thick coatability is lowered and the shrinkage amount is increased, so that there is a risk of cracking. Furthermore, the viscosity increases and the workability of the iron also decreases. On the other hand, when the ratio of the lightweight fine aggregate exceeds 0.62, the strength decreases greatly, the amount of kneaded water increases, and the amount of shrinkage after hardening increases, which may cause cracks. The bulk specific gravity of the lightweight fine aggregate is preferably 0.025 to 0.23, and the particle diameter of the lightweight fine aggregate is preferably 0.15 to 3.0 mm. Specifically, ethylene vinyl acetate foam, pearlite, polystyrene foam, etc. can be used as the lightweight fine aggregate. For example, trade name “EVA foam 3 mm” manufactured by Mifuku Kogyo Co., Ltd., “Pacific Perlite No. 4 B” manufactured by Taiheiyo Material Co., Ltd. and the like can be mentioned.

  As the polymer, a polymer dispersion and a re-emulsified powder resin can be used. As the polymer dispersion, those specified in JIS A6203 can be used, and as the re-emulsifying powder resin, those specified in JIS A6203 can also be used. That is, as the polymer dispersion, a resin mainly composed of polyacrylic acid ester, styrene butadiene, ethylene vinyl acetate, or the like can be used. Further, as the re-emulsifying powder resin, a powdery resin mainly composed of polyacrylic acid ester, ethylene vinyl acetate, vinyl acetate / vinyl versatate, vinyl acetate / vinyl versatate / acrylic acid ester, etc. is used. be able to. Moreover, the manufacturing method of re-emulsification type powder resin is not limited, You may manufacture by any manufacturing methods, such as the powdering method and the blocking prevention method. The content of the polymer is preferably 11 to 40 parts by mass, more preferably 12 to 35 parts by mass, and further preferably 12 to 25 parts by mass in terms of solid content with respect to 100 parts by mass of cement. If it is less than 11 parts by mass, almost no blending effect can be obtained. On the other hand, if it exceeds 40 parts by mass, the strength is not lowered, the viscosity is increased, and the workability is lowered.

  Alkali-resistant fibers can be mixed in the (D-1) base mortar used in the present invention. The alkali resistant fiber is not particularly limited as long as it is alkali resistant, and may be either an organic fiber or an inorganic fiber. Commercially available alkali-resistant fibers include short fibers and convergent fibers, but both can be used. Examples of the organic fiber include acrylic fiber, vinylon fiber, nylon fiber, polyester fiber, polypropylene fiber, aramid fiber, and carbon fiber. Examples of the inorganic fiber include glass fiber and mineral fiber. Of these, inorganic fibers are particularly preferred because alkali-resistant glass fibers are not mixed with cement mortar and do not deteriorate the iron workability. The preferable fiber length of the alkali-resistant fiber is 3 to 20 mm from the viewpoint of an improvement effect of bending strength and the trowel workability, and a more preferable fiber length is 5 to 15 mm. Examples of commercially available organic fibers include Kuraray Co., Ltd. vinylon fiber brand name “RMS” and Toray Industries, Inc. nylon fiber brand name “Tough Binder”. As a commercial item of inorganic fiber, for example, trade name “ARG fiber 13 mm” manufactured by Nippon Electric Glass Co., Ltd., trade name “Anti-Crack HD” manufactured by Taiheiyo Material Co., Ltd. can be used. The content of the alkali-resistant fiber is preferably 0.05 to 0.30 parts by mass with respect to 100 parts by mass of cement from the viewpoint of improving bending strength and trowel workability, and preferably 0.10 to 0.25. It is more preferable that it is a mass part, and it is still more preferable that it is 0.10-0.19 mass part.

  A water retention agent may be blended in the (D-1) base mortar of the outer wall structure of the present invention. As the water retention agent, a cellulose derivative that dissolves in water can be used, and examples thereof include water-soluble cellulose derivatives such as methylcellulose, carboxymethylcellulose, hydroxypropylmethylcellulose, hydroxyethylcellulose, hydroxyethylmethylcellulose, hydroxypropylcellulose, and cellulose sulfate. . Of these, methylcellulose, hydroxypropylmethylcellulose, hydroxyethylmethylcellulose and the like are preferable. Examples of commercially available products include SKW East Asia Co., Ltd. trade name “Chirose MH6002P2”, Matsumoto Yushi Seiyaku Co., Ltd. trade name “Marporose 90MP-4T”, and the like. The amount of water retention agent used is preferably 0.10 to 0.20 parts by mass, more preferably 0.12 to 0.20 parts by mass with respect to 100 parts by mass of cement from the viewpoint of water retention effect, curability, iron workability, and the like. preferable.

The (D-2) alkali-resistant fiber mesh fabric of the outer wall structure of the present invention is important for improving the bending toughness. As the organic fiber mesh fabric, acrylic fiber mesh fabric, vinylon fiber mesh fabric, polyester fiber mesh fabric are used. However, in view of adhesion to mortar, an alkali-resistant glass fiber mesh fabric is preferable as the inorganic fiber mesh fabric. For example, a product name “TD5 × 5” manufactured by Nippon Electric Glass Co., Ltd. may be mentioned. The opening of the alkali-resistant fiber mesh fabric is preferably 5 to 10 mm, more preferably 6 to 10 mm, from the viewpoint of workability to mortar, bending toughness improvement effect, and crack prevention effect. Here, since the mesh size affects the adhesion between the base mortar and the alkali-resistant fiber mesh fabric, a size that allows fine aggregates to pass through is preferable. If the opening of the mesh is less than 5 mm, it takes time for the mesh fabric to sink, and if it exceeds 10 mm, the bending toughness improving effect and the crack preventing effect may be reduced.
Moreover, although the thickness of an alkali-resistant fiber mesh fabric is not specifically limited, 0.20-0.40 mm is preferable.

  In the outer wall structure for a detached house of the present invention, (D-2) the installation position of the alkali-resistant fiber mesh fabric is important for obtaining excellent bending toughness, and (D-2) is changed to (D-1). It is necessary to enclose. In order to obtain such a structure, in the (D-1) foundation mortar layer, (D-2) an alkali resistant fiber mesh at a position of 0.5 to 3 mm from the boundary between (D-1) the foundation mortar and (E) the finishing material. It is preferable to embed a woven fabric. (D-2) If an alkali-resistant fiber mesh fabric is embedded at a position deeper than 3 mm from the boundary, the bending toughness improving effect may be lost.

  The (E) finishing material of the outer wall structure of the present invention contains a fine aggregate, an expansion material, metakaolin, a silane water repellent and a polymer.

(E) It is preferable that the density of the fine aggregate used for a finishing material is 2.0 g / cm < ³ > or more. The fine aggregate is preferably composed of particles having a particle size of 600 to 2500 μm of 35 to 50% by mass, a particle size of 300 to 600 μm of 30 to 45% by mass, and a particle size of less than 300 μm of 25% by mass or less.

  (E) The fine aggregate used for the finishing material is preferably adjusted in color by a Munsell color system so that the saturation is 0.5 or less and the brightness is 9 or more. It is preferably adjusted. For example, “Hitachi Seisui No. 4” and “Hitachi Seisui No. 1” manufactured by Hitachi Kansui Stone Co., Ltd. "Silica sand 7".

  (E) Content of the fine aggregate used for a finishing material is 230-360 mass parts with respect to 100 mass parts of cement. A preferable content is 260 to 360 parts by mass, and a more preferable content is 260 to 300 parts by mass. A desirable ratio of cryogenic stone in the fine aggregate is 50% by mass or more in consideration of the finished color of the finishing material. If the content of the fine aggregate is less than 230 parts by mass, the proportion of the cement amount is too large and the viscosity increases and the workability decreases. For this reason, a good finished pattern cannot be obtained, and an appropriate construction thickness cannot be obtained. In addition, the water-cement ratio increases, drying shrinkage increases, and cracks may occur. When the content of the fine aggregate exceeds 360 parts by mass, the iron workability is lowered and roller construction becomes difficult. Moreover, since the blending amount of cement is reduced, the contour of the finished pattern becomes unclear and the design properties are also lowered.

  (E) As for the cement used for the finishing material, commercially available Portland cement and special cement can be used, but it is preferable to use a commercially available white cement with excellent design properties considering that it is a cement-based finish. . For example, the product name “White Cement” manufactured by Sanyo White Cement Co., Ltd., the product name “White Cement” manufactured by Aki Hiro Ankei White Water Mud Co., Ltd., etc. can be used.

  (E) As the expansion material used for the finishing material, a commercially available expansion material can be used, and a lime-based expansion material, an ettringite-based expansion material, and the like can be used. For example, trade name “Pacific Expan (for structure)”, “Pacific Gypcal” manufactured by Taiheiyo Material Co., Ltd. can be used.

  (E) Content of the expansion | swelling material used for a finishing material is 2-6 mass parts with respect to 100 mass parts of cement. A preferable content is 3.3 to 5.5 parts by mass, and a more preferable content is 4.0 to 4.8 parts by mass. If it is less than 2 parts by mass, there is no mixing effect and no crack reduction effect is obtained. If it exceeds 6 parts by mass, abnormal expansion will occur after construction, and peeling or peeling may occur. In addition, after construction in the cold season, there is a risk of delayed expansion and peeling or peeling.

(E) The metakaolin used for the finishing material is preferably a fine powder having a specific surface area of 10000 cm ² / g or more in order to obtain an effect of improving water tightness and iron workability. Furthermore, in consideration of the fact that it does not affect the appearance when mixed with a finishing material, it is preferable to use a Munsell color system that exhibits a saturation of 0.5 or less and a brightness of 9 or more. Examples of such metakaolin include a trade name “Meta-Max HRM” manufactured by BASF Pozzolith Co., Ltd.

  (E) The metakaolin used for the finishing material contains 3 to 5 parts by mass with respect to 100 parts by mass of cement. The preferable content is 3.3 to 4.5 parts by mass, and the more preferable content is 3.3 to 4.0 parts by mass. If it is less than 3 parts by mass, the effect of improving water tightness and iron workability cannot be obtained, and the effect of mixing is not recognized. If it exceeds 5 parts by mass, the water cement ratio increases and the water tightness decreases.

  (E) The silane water repellent used for the finishing material is preferably a silane compound that is mixed with cement mortar and becomes reactive silanol under high alkaline conditions. Examples of such silane compounds include organic silanes and polysilanes. Specific examples include trade name “Seal 80” manufactured by Akzo Nobel Co., Ltd. The surface of reactive silanol is modified to be hydrophobic by crosslinking between silanol groups or reaction with an inorganic compound. Therefore, the silane water repellent has good kneading properties, and the finishing material exhibits excellent water repellency after curing.

  The silane water repellent used for the finishing material (E) of the present invention contains 0.07 to 0.70 parts by mass with respect to 100 parts by mass of cement. Preferable content is 0.16-0.68 mass part, and more preferable content is 0.16-0.60 mass part. If it is less than 0.07 parts by mass, proper water repellency cannot be obtained, and there is no effect of mixing. Even if it exceeds 0.70 parts by mass, the improvement of the water repellent effect is small and uneconomical.

  (E) As the polymer used for the finishing material, (D-1) the same polymer as that used for the base mortar can be used.

  (E) Content of the polymer used for a finishing material is 3-17 mass parts in conversion of solid content with respect to 100 mass parts of cement. A preferable content is 4 to 15 parts by mass, and a more preferable content is 6 to 15 parts by mass. If the amount is less than 3 parts by mass, there is no effect of reducing water absorption. If the amount exceeds 17 parts by mass, the viscosity increases and the workability decreases.

  The (F) highly durable finish paint of the present invention is preferably a durable paint excellent in self-cleaning performance, antifouling property, antifungal property, and antialgal property. An elastic acrylic resin paint or the like using an elastic acrylic resin emulsion as a binder is not included in the (F) high durability finish paint because the coating film is liable to deteriorate and has poor durability. As such a highly durable finish paint, both a hydrophobic paint and a hydrophilic paint can be used. Hydrophobic paints are characterized in that contaminants, water, ice and snow, etc. are less likely to adhere due to the water-repellent effect on the surface of the coating film, and are easy to remove even if they adhere. Moreover, in order to maintain water repellency, weather resistance and abrasion resistance are imparted. Examples of such hydrophobic paints include modified siliceous paints and silicon paints. As a modified siliceous paint, after application, a high-density, water-vapor-permeable coating film is formed by the modified inorganic polymer composite, and appropriate moisture is absorbed and discharged while completely blocking rainwater etc. Those having the property of integrating with cement over time are preferable. As a commercial item of such a modified siliceous paint, for example, trade name “Landex Coat WS Hydrophobic Agent” manufactured by Dainichi Giken Kogyo Co., Ltd. may be mentioned.

  Silicone paint is crosslinked by a strong siloxane bond after application, so it has high weather resistance to prevent gloss change and discoloration, and also has a property (hydrophilicity) that is compatible with water on the coating surface. It has a self-cleaning performance that makes it difficult for oily pollutants to adhere to it and causes the pollutants to flow due to rain water during rain, and it has excellent moisture permeability and can prevent dew condensation on a detached house. Those are preferred. Examples of such silicon-based paints include acrylic silicon resin paints. Examples of commercially available silicone paints include “Nippe Fine Silicon Fresh” (registered trademark), “Nippe High Elasticity Fine Silicon Fresh” (registered trademark), and “Nippe Fine Silicon Fresh Clear” (registered trademark) manufactured by Nippon Paint Co., Ltd. ) And the like.

  The hydrophilic coating has a function of making the surface of the coating film highly wettable and making it difficult for lipophilic substances such as exhaust smoke to adhere to the coating film, and to flow down with rainwater even if dirt is attached. Thus, the hydrophilic paint has a self-cleaning effect that prevents dripping contamination. Examples of hydrophilic paints include fluorine paints, acrylic silicon paints, urethane paints, and the like. Since these paints are exterior paints, measures are generally taken to prevent microbial contamination such as mold and algae. Examples of the fluorine-based paint include fluororesin paints, and solvent-based fluororesin paints and aqueous fluororesin paints. Examples of commercially available fluororesin paints include trade name “Ares Aqua Fluoro II” manufactured by Kansai Paint Co., Ltd. As the acrylic silicon-based paint, an aqueous reaction-curable emulsion-based paint in which an aqueous reaction-curable resin and an aqueous acrylic-silicon resin are blended is preferable. Examples of the acrylic silicon-based paint include “Ares Aqua Build” manufactured by Kansai Paint Co., Ltd. Examples of urethane-based paints include trade names “Fine Urethane U100”, “Elastic Fine Urethane U100”, and “Low Contamination Fine Urethane U100” manufactured by Nippon Paint Co., Ltd.

  The highly durable finish paint is applied using a wool roller, brush, airless spray, air spray, or the like after the finish (E) is applied.

  The outer wall structure of the detached house of the present invention is composed of (A), (B), (C), (D-1), (E), and (F) in this order, and (F) the finish paint has a design property. Although it is important that it is excellent in durability, it is important that (D-1) base mortar and (E) finishing material do not cause deterioration such as cracking and peeling. That is, (D-1) If the base mortar and (E) finishing material are cracked, peeled off, etc., the (F) high durability finish paint may be cracked, peeled off, etc. accordingly. is there.

  The construction method of the outer wall structure of the detached house of the present invention is (A) a wooden base, (B) waterproof paper, (C) metal lath, and (D-1) a ratio of lightweight fine aggregate to 100 parts by mass of cement. 20 to 117 parts by mass of fine aggregates of 0.04 to 0.62, and a base mortar containing 11 to 40 parts by mass of polymer in terms of solid content, (D-2) alkali-resistant fiber mesh fabric, (E) 230 to 360 parts by mass of fine aggregate, 2 to 6 parts by mass of expansion material, 3 to 5 parts by mass of metakaolin, 0.07 to 0.70 parts by mass of silane-based water repellent and polymer with respect to 100 parts by mass of cement Is a finishing material containing 3 to 17 parts by mass in terms of solid content, and (F) a construction method of an outer wall structure of a detached house on which a highly durable finish paint is applied, and (D-2) is changed to (D-1) Work to include.

  For example, as shown in FIG. 1, the base mortar can be applied to the surface of a wooden base with waterproof paper or metal lath. The thickness of the base mortar is usually preferably 8 to 16 mm. It is also preferable to lay the alkali-resistant fiber mesh fabric after application of the base mortar, and embed it in the base mortar, for example, at a position of 0.5 to 3 mm from the boundary between the base mortar and the finishing material as shown in FIG. Is called.

  EXAMPLES Next, although an Example is given and this invention is demonstrated further, this invention is not limited to these Examples.

Examples 1-3 and Comparative Examples 1-3
Using the materials shown in Table 1, base mortar was produced with the composition shown in Table 2. Moreover, the test body of FIG. 3 was produced by JASS 15M-102 using the obtained base mortar.
About the obtained foundation | substrate mortar and a test body, the flow test, the unit volume mass, the water absorption test, the bending strength test, and the confirmation of the iron workability were performed. The results are shown in Table 9.

<Confirmation of fresh properties>
1-1. Flow test Measured according to JIS R5201 in a 20 ° C test room.
1-2. Measurement of unit volume mass It measured by JISA1171 in a 20 degreeC test room using a 500 mL stainless steel container.

<Confirmation of curing properties>
2-1. Water absorption test According to JISA 1171, the amount of water absorption for 24 hours was measured in a test chamber at 20 ° C. The evaluation criteria are as shown in Table 3.

2-2. Bending Strength Test Using a 4 × 4 × 16 cm specimen prepared according to JASS 15M-102, the bending strength was measured at a material age of 7 days. The mesh fabric was embedded at the position shown in FIG. The test was conducted at a constant deflection of 0.5 mm / min.

FIG. 4 and FIG. 5 show changes in bending stress in the examples (with mesh fabric) and comparative examples (without mesh fabric) in the bending strength test. In the base mortar of the comparative example, the change in bending stress is only the primary bending strength as shown in FIG. On the other hand, as shown in FIG. 4, the base mortar of the embodiment generates a primary bending strength and then a secondary bending strength. The amount of displacement up to the secondary bending strength was taken as the amount of secondary displacement. These secondary bending strengths and secondary displacements were used as evaluation criteria for rigidity and bending strength. Secondary bending strength of 1.3 N / mm ² or more was evaluated as ◯, and secondary displacement of 1.0 mm or more was evaluated as ◯ (Table 4 (evaluation items for bending strength test) and Table 5 (for bending strength test). Evaluation criteria)).

<Confirmation of iron workability>
Evaluation test of iron workability 900 mm x 900 mm x 12 mm painted plywood is coated with 850 x 850 mm W laths with staples, and each sample is coated with gold trowel to a thickness of 10 mm in a test chamber at 20 ° C. It was. After 24 hours, each sample was applied with a thickness of 5 mm, and the operability of the iron workability and the alkali-resistant glass fiber mesh fabric was evaluated.

<Comprehensive evaluation>
Table 8 shows the criteria for comprehensive evaluation in consideration of the physical property test results and the evaluation results of the iron workability.

  As is clear from Table 9, the ground mortar used in the present invention has a good fresh property such as a flow test, a good water absorption test result after curing, good workability, and rigidity and bending. Since it is excellent in strength, it turns out that the durability with respect to static loading and dynamic loading is excellent. On the other hand, Comparative Examples 1, 2, and 3 are examples that do not satisfy the condition (D-1) of the present invention because the ratio of the lightweight fine aggregate exceeds the upper limit of 0.62 of the present invention.

Examples 4-5 and Comparative Examples 4-5
Using the materials shown in Table 10, finishing materials were produced with the compositions shown in Table 11.
About the obtained finishing material, the flow test, the unit volume mass, and the modeling property were confirmed. The results are shown in Table 18 (Example 4). In addition, the length change rate, antifouling property, finished color, water absorption, freeze / thaw resistance, bending strength, and compressive strength were confirmed. The results are shown in Table 19 (Example 5).

<Confirmation of fresh properties>
3-1. Flow test Measured according to JIS R5201 in a 20 ° C test room.
3-2. Measurement of unit volume mass It measured by JISA1171 in a 20 degreeC test room using a 500 mL stainless steel container.

<Performance evaluation method>
4-1. Formability evaluation test In a test room at 20 ° C., whether spraying, roller construction, gold trowel construction, scraping finish, or plaster finish is possible was confirmed by constructing a 450 × 600 × 60 mm concrete plate with a thickness of 5 mm. In addition, the spray construction used a ricin gun, and the roller construction produced the 210 mm width roller from which the 7 mm width comb pattern was obtained, and confirmed workability. For the gold trowel finish, a 7 mm comb trowel was used. The evaluation criteria are as shown in Table 12.

  Table 13 shows the comprehensive evaluation criteria for the design (formability) of the present invention.

4-2. Length change test According to JISA 1171, the length change rate of 28 days was measured. Evaluation items are as shown in Table 14.

4-3. Antifouling test and evaluation of finished color In a 20 ° C. test room, two 150 × 300 × 5 mm flexible boards were smoothly applied to a thickness of 5 mm with a gold trowel. After curing for 3 weeks, the color tone of one of them was confirmed by Munsell value.
A sample having a saturation of 0.5 or less and a lightness of 9 or more was evaluated as “◯”.
A case where the saturation exceeds 0.5 and the brightness is less than 9 was evaluated as “x”.
Thereafter, one sheet was sealed with a five-sided epoxy resin, and in the fourth week, the exposure test was started with the south side facing upright. The exposure period was 3 months, and the color difference ΔE * ab from the test specimen that was not exposed was measured with a color difference meter. Evaluation items are as shown in Table 15.

4-4. Water absorption test According to JISA 1171, the amount of water absorption for 24 hours was measured in a test chamber at 20 ° C. Evaluation criteria are as shown in Table 16.

4-5. Freeze-thaw test A 100 x 100 x 400 mm mold was used and cured in a test room at 20 ° C for 4 weeks according to JISA 1171, and then immersed in water at 20 ° C for 24 hours to start the test. The freeze-thaw test was performed 300 cycles according to JISA1148. The test body was set to n = 1 in consideration of the test period and the test level. Freeze-thaw resistance was evaluated according to the relative kinematic modulus and Table 17.

4-6. Bending / compression test In accordance with JISA 1171, the test was performed in a 20 ° C. test room. The size of the specimen was 40 × 40 × 160 mm and the age was 28 days. The compressive strength test was carried out with n = 6 using the specimen for which the bending strength test was completed.

  Table 10 shows the materials used. The Munsell values in Table 10 are color tones according to the Munsell color system, N is lightness, R is red, and Y is yellow. The number after the slash indicates saturation.

  As is apparent from Tables 18 to 19, the finishing material used in the present invention has a good finished color, excellent formability and workability, antifouling properties, freeze-thaw resistance, and water resistance. It was. On the other hand, the finishing material that does not contain any of the components (E) of the present invention was inferior in any of these evaluations. In Comparative Examples 4 and 5, since Formulation 16 does not contain an expansion material, Formulation 17 does not contain a silane water repellent, so Formulation 18 uses a resin stucco that is different from the finishing material of the present invention. Therefore, both are examples that do not satisfy the condition (E) of the present invention.

Examples 6-9 and Comparative Examples 6-10
Using the finish paint shown in Table 20, a durability test (hot cooling repeated test) was performed. The results are shown in Tables 22-30.

5-1. Finishing paint durability test (hot and cold repeated test)
(A), (B), (C), (D-1), (E), on a wooden substrate of 300 × 300 mm, according to the Japanese Architectural Finishing Society Standard M-101 water absorption adjusting material for cement mortar coating 1500 cycles were repeated using the specimens constructed in the order of (F). The pre-test curing of the test body was performed for 28 days in a test room at 20 ° C. and 60% RH after (F) construction. The number of test specimens was two at each level.

5-2. Adhesion test The adhesion strength was measured with a Kenken-type adhesive strength tester. The cut into the test specimen was cut to a size of 40 × 40 MM until reaching (D).

5-3. Water permeability test It was performed according to JIS A6909.

  Table 21 shows the evaluation criteria for adhesion strength and water permeability.

  As apparent from Tables 22 to 30, the highly durable finish paint used in the present invention had excellent adhesion strength and a small water permeability. Comparative Example 6 is an example in which the base mortar does not satisfy the condition (D-1), (E) does not contain a finish material, and the finish paint is not (F) a highly durable finish paint. Yes, Comparative Example 7 is an example in which the base mortar and the finishing material do not satisfy the conditions of the present invention, and (F) does not contain a highly durable finish paint. Comparative Example 8 and Comparative Example 10 The mortar and the finishing material do not satisfy the conditions of the present invention, and (F) is an example that does not contain a highly durable finishing paint, and Comparative Example 9 is that in which the base mortar and the finishing material do not satisfy the conditions of the present invention Furthermore, the finish paint is not an example of (F) a highly durable finish paint.

Examples 10-14 and Comparative Examples 11-15
An antifouling test was performed on the outer wall in an environment with planting around 3m in height. The results are shown in Table 33.

Antifouling test on outer wall <Antifouling test on outer wall by experimental building>
The outer wall 60 m ² with a planting of approximately 3m to ambient, and one-story experimental building premises 4 × 8m woody base, waterproof paper, after construction of the metal lath (W class), base mortar, alkali-resistant fiber mesh fabric, finish and The finish paint was applied in one month including the curing period according to the specifications shown in Table 31. Thereafter, the soil was visually observed every 3 months for 1 year. The construction site was divided into three equal parts on the south side, and the north, east and west sides were divided into two equal parts on the left and right. The results are shown in Table 33.

<Evaluation method and evaluation criteria>
5-1. Evaluation method Deformation of the outer wall was visually observed for one year every three months.

5-2. Evaluation Criteria Table 32 shows the evaluation criteria of the outer wall antifouling test.

  As can be seen from Table 33, the outer wall of the present invention has excellent design and durability with no cracking and no dust adhesion even after one year. On the other hand, the outer wall not containing any of (D-1), (D2), (E), and (F) of the present invention was inferior in any of these evaluations. In addition, Comparative Example 11 is an example in which the finishing material does not satisfy the condition of the component (E) of the present invention, and the finishing coating is not (F) a highly durable finishing coating, and Comparative Example 12 is (D -2) is not contained, the finishing material does not satisfy the conditions of the component (E) of the present invention, and the finishing paint is (F) an example that is not a highly durable finishing paint. In addition, the finish paint is not an (F) high durability finish paint, and Comparative Example 14 does not contain a mesh fabric, and the finish material does not satisfy the condition of the component (E) of the present invention. Furthermore, the finish paint is an example where the finish paint is not (F) a highly durable finish paint, and Comparative Example 15 is a finish material that does not satisfy the condition of the component (E) of the present invention, and the finish paint is applied. This is not an example.

Examples 15-19 and Comparative Examples 16-20
An antifouling test was conducted on the outer wall in an environment where there was no structure or planting in the surroundings and the soil was directly exposed to dust. The results are shown in Table 35.

<Anti-fouling test on the outer wall using a specimen>
A 900 × 900 × 12 mm structural plywood was used as a wooden base, and after applying waterproof paper and metal lath (W lath), test specimens were prepared with the specifications shown in Table 34 for the base mortar, mesh fabric, finishing material, and finishing paint. The test specimen was prepared in one month including the curing period. Thereafter, the soil was visually observed every 3 months for 1 year. The test body was installed facing south. In addition, the evaluation method and the evaluation criteria are the same as those in the above 5-1, 5-2.

  As is apparent from Table 35, the outer wall of the present invention is excellent in that no cracks occur and no dust adheres even after one year in an environment where it is directly subjected to dust without structures or planting around it. It had excellent design and durability. On the other hand, the outer wall not containing any of (D-1), (D2), (E), and (F) of the present invention was inferior in any of these evaluations. In Comparative Example 16, the base mortar does not satisfy the condition of the component (D-1) of the present invention, the finishing material does not satisfy the condition of the component (E) of the present invention, and the finish paint ( F) It is an example that is not a highly durable finish paint, and Comparative Example 17 is one in which the base mortar does not satisfy the condition of the component (D-1) of the present invention, does not contain a mesh fabric, and the finish is the present invention. Component (E) does not satisfy the conditions, and the finish paint is not (F) a highly durable finish paint. In Comparative Example 18, the base mortar satisfies the conditions of the component (D-1) of the present invention. In this example, the finishing material does not satisfy the conditions of the component (E) of the present invention, and the finishing paint is not (F) a highly durable finishing paint. It does not meet the conditions of the present component (D-1) In this example, the finish mortar does not satisfy the condition of the component (D-1) of the present invention. Yes, this is an example in which the finishing material does not satisfy the conditions of the component (E) of the present invention, and the finishing paint is not applied.

1: Pillar 2: Interstitial column 3: Woody base 4: Waterproof paper 5: Metal lath 6-1: Base mortar 6-2: Alkali-resistant fiber mesh fabric 7: Finishing material 8: High durability no paint

Claims (6)

  20 (A) woody base, (B) waterproof paper, (C) metal lath, (D-1) 20 fine aggregates having a lightweight fine aggregate ratio of 0.04 to 0.62 per 100 parts by mass of cement ~ 117 parts by mass and base mortar containing 11 to 40 parts by mass of polymer in terms of solid content, (D-2) alkali-resistant fiber mesh fabric, (E) 230 to 360 parts by mass of fine aggregate with respect to 100 parts by mass of cement Finishing material containing 2 to 6 parts by mass of expansion material, 3 to 5 parts by mass of metakaolin, 0.07 to 0.70 parts by mass of silane-based water repellent and 3 to 17 parts by mass of polymer in terms of solid content And (F) a highly durable finish paint, (D-2) is included in (D-1), and (A), (B), (C), (D-1), ( E) An outer wall structure of a detached house characterized by being constructed in the order of (F).   (F) The highly durable finish paint is at least one selected from the group consisting of modified siliceous paints, urethane paints, silicon paints, fluorine paints and acrylic silicon paints. Exterior wall structure.   (D-1) In the base mortar layer, (D-2) The alkali-resistant fiber mesh fabric is included at a position of 0.5 to 3 mm from the boundary between (D-1) the base mortar and (E) the finishing material. Item 3. The outer wall structure of a detached house according to item 1 or 2.   (E) The outer wall structure of a detached house according to any one of claims 1 to 3, wherein the finishing material cement is white cement.   (E) The finishing material is composed of particles having a particle diameter of 600 to 2500 μm with a particle size of 35 to 50 mass%, a particle diameter of 300 to 600 μm with 30 to 45 mass%, and a particle diameter of less than 300 μm with a particle size of 25 mass% or less with respect to 100 mass parts of cement The outer wall structure of a detached house according to any one of claims 1 to 4, further comprising 230 to 360 parts by mass of fine aggregate.   (A) A fine aggregate in which the ratio of lightweight fine aggregate is 0.04 to 0.62 with respect to 100 parts by mass of (B) waterproof paper, (C) metal lath, and (D-1) cement on a wooden base. 20 to 117 parts by mass, and base mortar containing 11 to 40 parts by mass of polymer in terms of solid content, (D-2) alkali-resistant fiber mesh fabric, and (E) fine aggregates 230 to 360 with respect to 100 parts by mass of cement. Finishing containing 2 to 6 parts by mass of an expanding material, 3 to 5 parts by mass of metakaolin, 0.07 to 0.70 parts by mass of a silane water repellent and 3 to 17 parts by mass of a polymer in terms of solid content The construction method of the outer wall structure of a detached house where the material and (F) high durability finish paint are applied, wherein (D-2) is constructed so as to be included in (D-1) Construction method of the outer wall structure of a house.