JPS5910455B2 - Mortar wall construction method - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for constructing a mortar wall.

Conventionally, after the construction of a mortar wall, when the mortar base plate expands and contracts due to moisture absorption and drying, the joint filler filled in the protruding parts of the base plate generally has little flexibility and weak adhesion to latex cement and mortar, so the joint material cracks are likely to occur along the protruding portions of the base plate due to peeling off from the base plate or cracking of the joint material itself.

Cracks along this protrusion are different from hair cracks on the base board; there is no waterproof layer beneath the crack, and rainwater and moisture can directly infiltrate the back side of the mortar wall, resulting in leaks, studs, rims, etc. It was causing decay.

The present invention aims to eliminate the drawbacks of the conventional mortar construction method.

That is, the present invention improves the adhesive strength and flexibility of the joint material 8 by kneading methyl cellulose (MC) and methacrylic butyl rubber (MBR) into the cement aggregate mixture of the joint material 8, as detailed below. This is intended to prevent the occurrence of cracks in the protruding portion of the base plate and to prevent the infiltration of rainwater and moisture.

The configuration of the construction method of the present invention will be explained below.

■ As the plate-shaped body 1, plywood, hard fiberboard, asbestos cement board, etc. are used.

It is generally preferable to increase the angle of the end of the plate-shaped body 1 by 300 to 60° with respect to the surface in order to form a protrusion.

After forming a waterproof layer on the surface of the plate-shaped body 1 with synthetic resin emulsion or rubber latex as necessary, a latex-cement mixture is prepared by mixing cement, rubber latex, emulsion, silica sand, calcium carbonate, organic or inorganic foam, etc. An uneven coating film 3 is formed to obtain a mortar base plate 4.

The mortar base plate 4 is made of metal, wood, etc., with a frame 6 and studs 5.
When it is fixed on the top with nails, T-bolts, adhesive, etc., a V-groove is formed along the protruding part of the base plate 4.

(2) Next, after filling the joint material 8 with a metal trowel, a spatula, a piece of wood, etc., the joint material 8 is left to cure and harden.

The joint material 8 is made of cement and aggregate containing methyl cellulose (
Hereinafter referred to as MC.

), methacrylbutyl rubber (hereinafter referred to as MBR).

) is added.

As the cement, Bortland cement, mixed Portland cement, etc. are used.

The aggregates are particles of calcium carbonate, silica sand, etc., with a particle size within the range of 0.2 to 1.6 mm, and among these, particles with a diameter of 50 or more are 0.4 to Q, and particles within the range of 9 mm. It is desirable that the diameter is the same.

The aggregate content is 100 to 400 parts by weight per 100 parts by weight of cement.
Mix parts by weight.

Methylcellulose MC is added in an amount of 0 to 5 parts by weight per 100 parts by weight of cement.

MBR is added in an amount of 10 to 40 parts by weight per 100 parts by weight of the mixture of cement and aggregate particles.

MBR is mixed to improve the adhesion between the joint material 8 and the latex cement coating 3 on the surface of the mortar base plate 4 and the top coat mortar 9, which will be described later, and to improve the flexibility of the joint material 8. is added as a thickener to the joint material 8 in order to prevent the viscosity from decreasing as a result of adding MBR to the cement aggregate mixture, making it difficult to fill the joint material 8.

As an additive to the above mixture of cement and aggregate particles, M
In addition to C and MBR, it is preferable to knead 5 to 20 times of a thermosetting resin such as melamine, urea, or phenol, since this is effective in improving the heat resistance of the joint material 8.

(2) Next, mortar 9 is applied directly to the joint material 8 and the surface of the uneven coating film 3 by troweling or blowing with a mortar gun.

(2) Next, the reason why the weight ratios of cement, aggregate, MC, and MBR, which are the components of the joint material 8 described above, and the particle size range of the aggregate particles are limited will be described.

■ First, the particle size of aggregate particles will be explained.

If the aggregate particle size is less than 0.2 mm, the shrinkage of the joint material 8 during curing or heating depends largely on the cement filled in the fine aggregate particles, resulting in a large shrinkage rate and causing cracking and peeling. It becomes easier and I don't like it.

On the other hand, if the aggregate particle diameter is 1.6 mm or more, the adhesion between the joint material 8 and the base plate 4 may deteriorate when filling the joint material 8 into the fine V-grooves, or the joint material 8 may not be kneaded uniformly. I don't like that.

Therefore, it is preferable that the particle size of the aggregate particles be in the range of 0.2 to 1.6 mm, because shrinkage is small and workability and adhesion are good.

In particular, particle sizes in the range of 0.4 to Q, 9 mm ML are excellent in terms of workability, shrinkage resistance, and adhesion, and particles with particle sizes in this range account for at least 50% or more of all aggregate particles, preferably It is desirable to include 60 or more sections.

@Next, we will discuss the mixing amount of aggregate particles.

When the amount of aggregate particles is less than 100 parts by weight per 100 parts by weight of cement, the ratio of aggregate is small, and the shrinkage rate of the joint material 8 increases due to the influence of cement, causing cracking and peeling. .

On the other hand, if the amount is 400 parts by weight or more based on 100 parts by weight of cement, the ratio of cement decreases, and the voids in the aggregate particles are not sufficiently filled with cement, resulting in a decrease in the strength of the joint material 8, which is not preferable.

○ MBR is kneaded to improve the adhesion between the uneven coating film 3 of latex cement on the surface of the mortar base plate of the joint material 8 and the top coat mortar 9, but the cement aggregate mixture 10
If it is less than 10 parts by weight, the effect of improving adhesive strength is small, and if it is more than 40%, the viscosity will be low even if MC is mixed, and the heat resistance will also be low, which is not preferable.

OMC is added as a thickener to the joint material 8 in order to prevent the viscosity of the joint material 8 from decreasing and making it difficult to fill the joint material 8 when MBR is mixed into the cement aggregate mixture. 5 parts per 100 parts by weight of cement.
It is preferable that the amount is less than 5%, and even if it is mixed in at 5% or more, the effect will be small.

Since the present invention has the above-described configuration, its effects will be described as follows.

That is, since MBR and Me are mixed into the joint material 8, it has flexibility and strong adhesion to cement and aggregate particles, so even if the mortar base plate 4 expands and contracts due to moisture absorption or drying, the joint material 8 Since it is strongly adhered to the base plate 4 and the mortar 9 and can be expanded and contracted, it will not crack or peel.

As a result, it is possible to prevent rainwater and moisture from entering through the joints.

The four sides of a 3-ply plywood board 1 with dimensions of 1820it x 910mm x 7.5mm and glued with melamine urea adhesive were cut at 45 degrees to the surface, and MB was applied to the surface.
A base plate 4, which is formed by forming an uneven coating film 3 using a mixture of MBR, cement, and silica sand, is fixed on the studs 5 and the rim 6 using a combination of rubber adhesive and nails 7 on which R is permeated. .

Next, a joint filler 8 having the composition shown below is filled into the V-groove of the projecting portion of the base plate 4 using a metal iron, and left for three days.

Finally, mortar 9 was applied to a thickness of 25 mm on the surface of the mortar base plate 4 and the joint material 8 to obtain the desired mortar wall.

The composition of the joint material 8 is as follows.

Cement = 100 parts by weight Calcium carbonate with a particle size of 0.2 to 16 mm: 200 parts by weight (including 5 parts with a particle size of 0.4 to 0.9) MC: Per 100 parts by weight of cement calcium carbonate mixture 1% by weight MBR: 20% by weight based on 100 parts by weight of cement calcium carbonate mixture

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a mortar wall constructed by the method of the present invention. FIG. 2 is a partially enlarged sectional view of a mortar wall according to the present invention. FIG. 3 is a perspective view of the base plate. Explanation of symbols, 2... Surface, 3... Uneven painted surface, 4... Base board, 5... Stud, 6...
...Front edge, 7...Nail, 8...Gout material, 9...Mortar.

Claims (1)

[Claims] 1. A plate-shaped body such as plywood, hard fiberboard, asbestos cement board, etc. 1
After fixing the base plate 4 with a chamfered end surface 2 on the base structure material, a joint material 8 is placed in the V groove formed in the protruding part of the base plate 4.
In a mortar wall construction method in which mortar 9 is filled and cured and then mortar 9 is applied on base board 4 and joint material 8,
The joint material 8 is composed of a mixture of cement, aggregate particles, and particles, and the cement-aggregate mixture contains methyl cellulose in an amount of 5 parts by weight or less per 100 parts by weight of cement, and methyl cellulose per 100 parts by weight of the cement-aggregate mixture. 10 to 40% by weight of methacrylic butyl rubber.
The method for constructing the mortar wall. 2 The cement aggregate mixture in the joint material 8 has a particle size of 0.2~
2. The method for constructing a mortar wall according to claim 1, wherein 100 to 400% by weight of aggregate particles in the range of 1.6 itt are mixed with 100 parts by weight of cement.