JPS603037B2 - Method for forming rough wall surfaces - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a wall surface of a building, and more specifically, it relates to a method for forming a beautiful hammered wall surface by one-time troweling.

BACKGROUND ART The construction of walls of buildings with a rough surface has been used in the construction industry for a long time.

Making the exterior walls of buildings look beautiful as dirt and cracks are not noticeable, and also for the interior, in places where there is a lot of steam generation such as bathrooms, water droplets due to condensation of water vapor can be Its use is increasing as it is highly praised for both aesthetic and functional aspects, such as its ability to diffuse onto surfaces and reduce water droplets falling from the ceiling. Conventionally, the ricin dusting method and the ricin spraying method have been adopted as methods for forming such a dregs-like wall surface.

The ricin removal method is to apply cement mortar to the base of the wall to a thickness of 7 to 8 cm using a wooden trowel, and then apply finishing mortar on top of that to a thickness of 7 to 8 cm using a metal trowel. This is a construction method in which the mortar is left to stand for about half a day to one day, and when the mortar is semi-dry, the surface of the mortar is scraped off by about 2 to 3 ribs using a scraper to make the surface rough. In the ricin spraying method, the base mortar is applied with a metal trowel and then finished with a brush, and a synthetic resin binder containing acrylic or vinyl acetate is used on this surface, or thin paint or cement-based glue is applied to this surface. A rough wall surface is formed by spraying the material using a spray gun or the like. In the ricin decontamination method, the decontamination work relies on manual labor, and the work efficiency is extremely low, with one standard worker handling 20 to 30 ricin products per day.

On the other hand, with the spraying method, the spraying process itself is efficient, with over 70 sprays per day. Even protection is required, and if you take into consideration the preparation of a spray gun (air compressor, power source, etc.), the workability will be extremely low in small-scale, complex-shaped ordinary houses. The present inventors have searched for various methods to improve workability in forming roughened surfaces while maintaining the aesthetic and functional usefulness of roughened walls of buildings. Using a metal trowel or a wooden trowel, apply a mortar containing 2 or more ribs of coarse aggregate of 1% or more by volume in a mortar composition (without water) and further adding poly(ethylene oxide) to the base surface. It has been discovered that by simply painting, it is possible to obtain a rough wall surface that is as aesthetically and functionally as the hammered surface obtained by the conventional method of scraping off lysine or spraying with lysine.

Furthermore, the present invention was completed by conducting experiments on the relationship between the molecular weight of poly(ethylene oxide) and the amount added, and determining the optimum amount. As is well known, poly(ethylene oxide) used in the method of the present invention is a water-soluble polymer substance obtained by polymerizing ethylene oxide in the presence of a catalyst. It also includes copolymers made by copolymerizing mainly with other monomers that can be copolymerized with it to the extent that it does not impede the water solubility of the resulting copolymer.

It can be used with a molecular weight of 8 to about 1000, but particularly preferably 10 to 500.
It belongs to ten thousand people. When poly(ethylene oxide) is added to mortar, the mortar becomes thicker, and when it is applied with a trowel, the coarse aggregate contained in the mortar is dragged by the trowel and rises to the surface of the mortar, resulting in a scum-like surface. . If borium (ethylene oxide) does not exist in the mortar, the coarse bones in the mortar will be buried inside the mortar by the trowel, and a smooth surface will normally be formed. A rough surface like that of the present invention can never be obtained. In order to obtain a mortar that forms a suitable rough surface, the amount of poly(ethylene oxide) added must be within a certain limited range, and the appropriate amount depends on the amount of poly(ethylene oxide) used. ) varies depending on the molecular weight. That is, when poly(ethylene oxide) with a large molecular weight is used, the thickening effect is large even when a small amount is added, and conversely, when the molecular weight is small, the thickening effect is small. In this way, if the viscosity of the mortar is high, it becomes difficult to apply the trowel and a uniform hammered surface cannot be obtained, and if the viscosity is low, the ability to bring out the coarse bones in the mortar to the surface is reduced, It becomes impossible to form a hammered surface. In this respect, it has been confirmed through experiments that the amount of poly(ethylene oxide) added needs to be within the range shown by the following formula, taking its molecular weight as a factor. 1 2oo
1○--≦A≦Ryonan 4Vmae+8 [Here, A is the amount of poly(ethylene oxide) added to the mortar, expressed as a weight percent based on the cement component in the mortar.

M represents the molecular weight of the poly(ethylene oxide).
] Furthermore, the amount of poly(ethylene oxide) added when optimum workability is obtained is shown by the following formula.

18 80 11 ≦ A ≦ Kawachi 4 no Fu + 12 [Here, A' is the amount of poly(ethylene oxide) added to the mortar, which is the weight percent of the cement component in the mortar, and M is the amount of poly(ethylene oxide) added to the mortar. The molecular weight of (d) is shown.

] The mortar used in the method of the present invention contains a cement component, aggregate, and poly(ethylene oxide), but if necessary, fibrous flock piles are added to prevent the mortar from cracking, and twill is added to provide waterproofness. There is no problem in adding various materials that are generally added to cement mortar, such as water agents, waterproofing agents, pigments for coloring, and colored wood powder.

The cement components used in the mortar of the present invention include not only hydraulic cements such as ordinary boltland cement, white cement, and colored cement, but also air-hardening cements that harden with carbon dioxide gas in the atmosphere. Aggregates used in general mortar materials such as crushed stone, sand, and foamed lightweight inorganic aggregates can be used as aggregates, but in the present invention, coarse aggregates with a particle size of 1.2 feet or more are hydrated. at least 1% weeping of the mortar composition excluding, preferably 30%,
It is necessary to contain 8% by volume. If it is less than 10%, the desired hammered surface will not be obtained and the wall surface will be nearly smooth, and if it is too much, a beautiful rough surface will not be obtained, and problems will arise in strength.

The optimal coarse aggregate is about 5 rin to 1/2 rin. The method of mixing the mortar composition of the present invention is not particularly limited, and ordinary mixing means can be used.

The cement components, aggregate, poly(ethylene oxide)
It is convenient to mix and package the materials and other necessary materials in advance without adding water, and then add an appropriate amount of water and knead them at the time of on-site construction. poly(ethylene oxide)
is known to have unique properties as a water-soluble polymer, and is commonly used as a sticky coagulant for paper manufacturing.

It is also known to add poly(ethylene oxide) to coating compositions containing particulate matter such as crushed stone. (Special Publick Publication No. 43-12-55) However, the purpose of this was to use poly(ethylene oxide) in the paint composition for spray application.
The purpose of this invention is to improve the flow characteristics of the paint liquid and improve the spray ability, and at the same time reduce the amount of particulates splashing off the painted surface, which is completely different from the purpose of the present invention. Alternatively, the coating liquid component in this case uses only an aqueous dispersion of a synthetic resin as a binder, and is different from the mortar component of the present invention, which uses a cement component as a binder. The addition of poly(ethylene oxide) to cement mortar for plastering is also described, for example, in Cement Technology Annual Report (1963), pages 194-199.

However, the purpose of adding water-soluble polymer substances such as poly(ethylene oxide), polyvinyl alcohol, and polyacrylamide to plastering cement mortar is to give it appropriate viscosity and improve adhesion, water retention, and workability. Not only is the objective different from the formation of a rough wall surface as in the present invention, but the appropriate viscosity in this case is a viscosity coefficient of 2.
0 (kg/sec), and the amount of poly(ethylene oxide) added to the cement is 0.05 to 0.0.
There is a large difference from the method of the present invention in terms of the amount added, such as keeping the weight percentage at a certain level. Furthermore, in polymer cement systems using latex or polymer resin emulsion, poly(ethylene oxide) can be dissolved in advance in the latex or polymer resin emulsion to be added, and this can be added to the cement mortar to improve drying shrinkage.
It has also been proposed to improve water retention and workability during curing. (Japanese Patent Publication No. 43-7142) However, in this case as well, the purpose of its addition is completely different, and the poly(ethylene oxide) is used only in the form of a pre-dissolved latex or emulsion, which is different from the method of the present invention. There are also clear differences in the means of implementation. In short, the present inventors have found that while all known methods aim to improve workability when applying poly(ethylene oxide) with a smooth mortar, We have been exploring various conditions for the exact opposite purpose of reducing the However, it was discovered that the purpose could be achieved only when poly(ethylene oxide) was used within a specific range of conditions, and this led to the completion of the present invention.

By carrying out the method of the present invention, it is possible to form a wall surface with a similar dregs surface through simple work and with good workability compared to the conventional IJ thin scraping method and lysine spraying method, reducing labor costs. It is surprising that not only can it be done, but it can also be constructed with such ease that even a person at home can do it by himself or herself, without requiring techniques such as scraping or painting, or special equipment. Hereinafter, embodiments of the present invention will be explained with reference to Examples.

Example 1 White cement 4.2 kg agarite (particle size 1.2-2.5) 00k9 pearlite (passed through 1.2 ribs) 0.8k9 fiber flock Added poly(ethylene oxide) to 0.2k9 Then, an appropriate amount of water was added to the mixture.

Particle size 1.2 for this mortar composition (excluding water)
The proportion of kansui stone above the cape was % of the nutritional capacity. The cement mortar thus obtained was applied using a metal trowel onto the base cement mortar pressed with a wooden trowel. The molecular weight of the added poly(ethylene oxide), its addition base, and the finish state of the mortar surface changed as shown in the following table. *
Note PEO: Product name Poly(ethylene oxide) manufactured by Tetsuko Kagaku ■Example 2 White cement
2.8 [9 Slaked lime
2.0k9 Kansuiseki (particle size 2.5-3.W)
6.0k9 perlite (passed through 1.2 lateral nodes)
0.4k9 fibrous flock 1
50 Ta Aluminum Stearate 100 TaP
E○ (molecular weight: 500,000) All of the samples were powders or granular solids, which were thoroughly mixed using a cement mixer.

This mixture contains approximately 1.2 volume % of akansuite with a particle size of 1.2.
It was included. The mixture was kneaded on site in a plastic bowl with water added to give it an appropriate consistency.

Claims (1)

[Claims] 1. A mortar composition consisting of at least a cement component, aggregate; poly(ethylene oxide), and water, before adding water, contains at least 10% by volume of aggregate with a particle size of 1.2 mm or more. and formula for poly(ethylene oxide) with a molecular weight of 80,000 to 10 million ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ [Here A is the poly(ethylene oxide) added to the mortar composition. In weight percent relative to the cement component, M indicates the molecular weight of the poly(ethylene oxide). ] A method for forming a rough wall surface by troweling a mortar composition containing the following amount onto a base surface. 2. The method according to claim 1, which contains the poly(ethylene oxide) in an amount represented by the formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (in the formula, M and A are the same as in claim 1). 3. The method according to claim 1, wherein the amount of aggregate with a particle size of 1.2 mm or more is 30 to 80% by volume. 4. The method according to claim 3, wherein the particle size of the aggregate is 1.5 mm to 3.6 mm.