JPS62164936A - Wall material for building - 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 [Field of Industrial Application] The present invention relates to a wall material for construction by filling a hollow part of fiber-reinforced cement with foamed mortar as a filler.

[Conventional technology]

As disclosed in Japanese Patent Application Laid-Open No. 60-23541, this type of wall material for construction is a fireproof material in which the cavity of a hollow asbestos cement extruded board is filled with an inorganic foam such as magnesia foam or clay foam. There are architectural panels with excellent durability and fire resistance. The general layer A-layer used for this architectural panel is a field type φ; 01 - bending start d & 1 (1 kg/i),
Very light, but not strong.

In addition, water-repellent coating materials such as polymeric materials, nonwoven fabrics, cement, or galvanized iron plates are used for the wood ends.

[Problem that the invention seeks to solve]

Cement-based hollow wall materials are currently manufactured by extrusion using asbestos cement. However, as asbestos is a pollutant, there are already no strict regulations in Europe and the United States, and there are moves to regulate it in Japan in the near future.Therefore, as an alternative to asbestos, vinylon fiber, aramid fiber, carbon fiber, glass fiber, and steel are being used as alternatives to asbestos. The applicability of fibers, etc. is being investigated. On the other hand, asbestos-cement extrusion molded materials are cured in autoclaves (high temperature and high pressure) from the viewpoint of strength and dimensional stability, and one of the characteristics of this curing is improved performance. A fiber suitable for at least autoclave curing is desired. As a result of studies conducted by the present inventors, it was found that vinylon fibers and aramid fibers undergo thermal deterioration during autoclave curing, and that glass fibers undergo alkali deterioration in cement materials under high temperature and high pressure. On the other hand, steel fibers do not deteriorate during autoclave curing, but on the other hand, there are problems with wear inside the extrusion molding machine and rusting in the molded material.

Therefore, carbon fiber is the most promising alternative to asbestos. As a result of various studies conducted by the inventors to date, it has been found that carbon fiber-reinforced cement extruded hollow molded materials are equivalent to or better than conventional asbestos cement extruded hollow molded materials in terms of wall material performance. Therefore, as a wall material for construction,
One idea is to fill the hollow part of a carbon fiber-reinforced cement extruded hollow molded material with an inorganic foam such as magnesia foam or clay foam, and cover the end of the material with a water-repellent coating material, as in conventional methods. However, since the above-mentioned inorganic foam has poor freeze-thaw resistance, poor caulking or deterioration of the caulking at the joints may cause rainwater to infiltrate through the end of the component, and this infiltrated water will freeze in the winter, causing the component to expand due to its volumetric expansion. There are defects such as the possibility of destruction.

Therefore, the present invention has excellent impact resistance and also has better freeze-thaw resistance than conventional construction panels.
The purpose is to provide architectural wall materials that are suitable for use in buildings.

[Means for solving problems]

In order to achieve the above object, the present invention provides a groove bottom in which the hollow part of a hollow (extrusion molded) material made of carbon fiber reinforced cement is filled with foamed mortar having a specific gravity of 0.4 to 1.2 as a wall material for construction. did.

The carbon fibers used in the extruded hollow member in the present invention are not particularly limited, but in consideration of economic efficiency, it is preferable to use pitch-based carbon fibers with a length of about 3 to 10 mm. The volumetric mixing ratio of carbon fibers is also not particularly limited, but is preferably 0.5 to 5 parts.

Furthermore, the types and amounts of cement, aggregate, and admixtures to be mixed are not limited. Furthermore, the cross-sectional shape and dimensions of the extruded hollow member are not limited and may be freely selected.

Foamed mortar, which is made by foaming mortar made of cement, aggregate, and water with a foaming agent, is used to fill the hollow space.

Foaming agents include rosin-based surfactants, anionic surfactants, and hydrolyzed protein-based surfactants.

The specific gravity of the foamed mortar is preferably 0.4 to 1.2, and is adjusted depending on the type and amount of cement, aggregate, and foaming agent, and the amount of water mixed. ．．
The reason why the value is 4 or more is that if the value is less than 0.4, the strength of the foamed mortar will decrease, so it will not contribute to improving the impact strength of the wall material, and the freeze-thaw resistance will decrease when the foamed mortar absorbs water. If the specific gravity of zero-foam mortar is increased, the strength will be improved, and the impact resistance and freeze-thaw resistance of the wall material will be improved, but on the other hand, the weight will increase.

The purpose of making the member hollow is primarily to reduce its weight, so filling the hollow part with a material whose specific gravity is greater than the true specific gravity of the extruded hollow member is the reason why the hollow member is used. In the present invention, the upper limit is set to the same value as the true specific gravity of 1.2 of hollow members currently obtained by extrusion molding. The timing of filling the foamed mortar is not particularly limited, but it is preferable that the extruded hollow member has enough strength not to be deformed by the injection pressure during filling. Preferably, this is done after the second half of extrusion molding or after the completion of steam curing. After that, it is desirable to autoclave the material.

[Effect]

The physical properties of foamed mortar are equivalent to ALC (autoclaved lightweight cellular concrete).

The critical moisture content is 5, which is the limit for freezing damage caused by natural water absorption.
Since the temperature does not reach 5.5 inches, it is often lower than that level and frost damage hardly occurs.

Additionally, it has the characteristic that the water content decreases as it moves away from the water-absorbing surface. Therefore, foamed mortar has excellent water-stopping properties, and even if frost damage occurs, it will gradually progress from the ends of the member and will not cause expansion failure in the carbon fiber reinforced cement hollow extrusion molded body. Example] Ordinary Portland cement 72wt'l for cement
y, carbon fiber-reinforced cement in which 3 volumes of pitch-based carbon fiber were mixed into cement materials with 22 wt% of shirasu balloons as aggregate and 1.4 wt% of methylcellulose as thickener was extruded into the shape shown in Figure 1. The shape of the carbon fiber reinforced cement hollow extrusion molded material 1 is width W250mm and height H2.
2. Afterwards, member 1 with a wall thickness of 5 mm was steam-cured (
40℃ x 10H)L.

In the hollow part 2 of the member 1, 58 wt% of ordinary Portland cement was added to the cement, 5 wt% of barley was added to the aggregate, and 35 w of water was added.
t%, and 2wt of hydrolyzed tanban as a foaming agent.
% and filled with foamed mortar 3 having a fresh specific gravity of 0.75% after mixing and a bending strength of 50 kg/d after autoclave curing as shown in Figure 2.0 Note that the water absorption rate of this foamed mortar is Upon investigation, it was found that the ratio of 28 ratio was smaller than the 34 ratio of ALC, and the water content did not even reach the limit of 55 ratio. After curing it in the air for one day, it was cured in an autoclave to obtain a wall material for construction. In order to know the impact resistance of the wall material for construction according to the present invention, hollow extrusion molding of carbon fiber reinforced cement without filling with foam mortar was performed. We conducted a comparative experiment with materials. In the impact resistance test, as shown in Figure 3, the wall materials 1 and 4 were attached to a wooden frame 5 with a span L of 450 mx using nails, and an electric decoration 6 weighing 1 kgf was dropped in the direction of the arrow, onto the back side of the wall materials 1 and 4. This was done by finding the limit position where no hole is visible. As a result, the fourth wall of the present invention, in which the hollow part was filled with foamed mortar, was 2.1 kg-m%.The wall material 1, which was not filled with foamed mortar, was 1.5' to 9-m, which improved impact resistance. was not recognized.

〔Effect of the invention〕

According to the present invention, the physical properties of foamed mortar are the same as ALC, and natural water absorption rarely exceeds 55 cm of water content, which causes frost damage, and the water content tends to decrease when separated from the water absorption surface. Therefore, it is possible to prevent expansion failure of the carbon fiber reinforced cement hollow extrusion molded material.

Furthermore, impact resistance is improved by filling with foam mortar.

In the invention of JP-A No. 60-23541, the cavity of a hollow asbestos extrusion plate is filled with an inorganic foam such as magnesia foam or clay foam to improve the fire protection and fire resistance of the construction panel. Water resistance has also been improved. Particularly specific gravity: 0.1, bending strength: 1. If the above-mentioned foam were to be used in the present invention, it would have some effect on rainwater infiltration from the end of the member, but the foam itself would be Since the foam has poor freeze-thaw resistance, the object of the present invention cannot be achieved if water penetrates into the foam, and furthermore, the foam is low in strength, so it is not useful for improving impact resistance. Therefore, the architectural wall material of the present invention does not necessarily require surface water-repellent treatment, and has excellent effects as a building member in cold regions.

[Brief explanation of drawings]

Brush 11: A perspective view of a hollow extrusion molded material of fiber-reinforced cement, and a perspective view of the wall material of the present invention, and a third view of impact resistance. It is a perspective view showing the wall material attached to the wooden frame for conducting the experiment. Material patent applicant Sumitomo Metal Industries Co., Ltd. Japan Hardboard Industries Co., Ltd. Representative patent attorney Yoshihisa Nagai 7-, -m-=
,3,-L LIJ゛

Claims (1)

[Claims] (1) A wall material for construction, characterized in that the hollow part of a hollow molded material made of carbon fiber-reinforced cement is filled with foamed mortar having a specific gravity of 0.4 to 1.2.