JPS6085156A - Construction of wall surface in house - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing a wall surface in a house, and particularly to a method for constructing a wall surface to prevent cracks in the wall surface after construction.

In the traditional wall construction method, a main beam is constructed on the frame structure of the house, such as a pillar 1 stud, a waterproof sheet is attached to it, a lath net is attached with a stable, and then cement mortar is applied. It was being applied.

Furthermore, recently, a method has been used in which an inorganic board such as a cement board or an ALC board is attached to the frame structure of a house to prepare the base, and then cement mortar is applied to the surface of the board.

When the moisture contained in the cement mortar coated on the substrate evaporates, the moisture moves through the cement 1-gel space or the capillary cavity, and due to the large surface tension generated at that time. The stress acting in the direction of reducing these voids changes the physical structure of the mortar layer, causing it to dry and shrink. During this drying shrinkage, cracks of various sizes occur in the cement mortar. These cracks not only reduce the aesthetic appearance of the wall surface, but even if they are minute cracks, rainwater can seep into the wall, corroding staples and lath mesh, and even damaging wood railings and pillars.

It also corrodes the studs and causes the cement mortar to flake off. Furthermore, even when an inorganic board is used for base preparation, when the cement mortar dries and shrinks, it creates areas with weak adhesion, and water penetrates through the cracks and dissipates between the base board and the cement mortar. It has been found that by incorporating the agent into the mortar layer, cracks that occur after drying of cement mortar can be significantly reduced. In particular, it is desirable to use a nonionic surfactant with a molecular weight of 1000 or less and a valence of 11 or 5 to 15, and the blending amount is preferably in the range of 0.5 to 8%.

Hereinafter, the present invention will be explained based on examples. Pillar.

A wall base is formed on the bone LSII structure of the house, such as studs, by a conventional method. The wall base may be formed by attaching a sheet of paper to the frame structure and stapling a waterproof sheet and a lath net on top of it, or use a plate-shaped body such as plywood, VA fiber board, stone tone board, etc. It may also be formed by bonding.

Cement, such as Portland cement or white cement, is mixed with one or more types of aggregate such as sand, silica sand, carbon dioxide, perlite, etc. according to a conventional method, and then kneaded using mixing water containing a nonionic surfactant. Prepare mortar.

The nonionic surfactants used include polyoxyethylene, polyoxyethylene alkyl ether, polyoxyethylene alkylphenol ether, oxyethylene, oxypropylene, sorbitan III fatty acid M ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene alkyl amine, These include polyoxyethylene fatty acid ester, glycerin ester, glycerin fatty acid ester, polyoxyethylene higher alcohol, alkylene oxide adduct of lower alcohol, and should be used in an amount of 0.5 to 8% by weight based on the amount of cemmet used.

The surface tension of the kneading water to which a nonionic surfactant has been added is adjusted to 40 dyn/J or less.

If the amount of nonionic surfactant added is less than 0.5%, it will not be possible to reduce the tensile stress due to the surface tension of water moving in the voids when cement mortar dries, and therefore The effectiveness of preventing cracking decreases relatively quickly. In addition, even if the amount of nonionic surfactant added is 8% or more,
The effect cannot be increased in proportion to the amount added. Therefore, the limit on the amount of nonionic surfactant added is not critical.

It is preferable to use a nonionic surfactant with a molecular weight of 1,000 or less; if the molecular weight exceeds 1,000, the effect of preventing cracking decreases. This seems to be due to the fact that movement within the voids in the cement gel is hindered.

In addition, the II L monovalent value of the nonionic surfactant is preferably 5 to 15, and when it is 5 or less, the air bubbles contained in the cement mortar are reduced due to the antifoaming effect, and when applying R-7. The trowel separation becomes poor and workability is reduced, and the adhesion at the mortar joints decreases, resulting in a decrease in wall strength. Furthermore, if the valence of III, 13 is 15 or more, air bubbles in the cement mortar will increase more than necessary, and the wall strength will decrease.

According to the present invention, the conventional method can prevent
Representative of Noda Plywood Co., Ltd. Patent attorney 1) Osamu Dairo

Claims (1)

[Scope of Claims] 0) Surface treatment for applying cement mortar to the frame structure of a house such as pillars and studs, such as pasting a Honzuri knee waterproof sheet, pasting a lath mesh, or pasting an inorganic board. A method for constructing walls in houses, which is characterized by applying cement mortar mixed with a nonionic surfactant after straining. (2) The amount of nonionic surfactant added to and mixed with cement mortar is α5 relative to the amount of cement used.
2. A method according to claim 1, characterized in that a cement mortar having a content of .about.8% by weight is used. (3) The molecular size of the nonionic surfactant added and mixed with cement mortar is 1000 or less, and its HL
The method according to claim 1 or 2, wherein the B value is 5 to 15.