JPS6068902A - Manufacture of aerated concrete panel - 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 is directed to a method for manufacturing a lightweight aerated concrete panel used as a building material, etc., and more specifically, it has a multi-layer structure with a boundary surface between each layer, and has waterproof properties. ,durability,
This article relates to a method for producing a robust aerated concrete panel.

In general, foamed concrete and flannel used as building materials are porous and have a high water absorption rate, poor waterproofing, and are prone to cracking, freezing and thawing, and are inferior in durability and strength. However, this problem was particularly severe in aerated concrete panels that had not been subjected to autoclave treatment.

In view of the above circumstances, the inventors of the present invention conducted extensive research into obtaining aerated concrete panels with excellent waterproofness, durability, and strength without autoclave treatment.
The foamed cellular cement slurry is placed in the formwork to a thickness of 5~
After forming a first cement layer of 20 layers and leaving it for several minutes to harden its surface, the foamed 2-foam cement slurry was added to the 17th layer (F)S.
A second cement layer is formed by stacking E on E, and then repeating the same operation as necessary to form multiple cement layers, which are then demolded and cured to create a boundary between each layer. It has been found that lightweight cellular concrete panels and flannel can be obtained which have a multi-layered structure having a surface and are excellent in waterproofness and water resistance.

That is, the present inventors used foamed cellular cement slurries such as foamable anti-fouling cement slurry, lightweight cellular cement slurry, and those to which lightweight aggregates such as foamed silica were added to formwork inner surface IK. A layer with a thickness of 5 to 20 vm+ is formed, and this is heated to 7I (r Pi) for several minutes to harden the interface to some extent. When a similar foamed cellular cement slurry is poured on top of this layer, physical damage occurs at the wall interface. Due to this, a fine cement film with few air bubbles is formed, and this layer of cement film with few air bubbles can improve the water absorption of the concrete panel. I learned that concrete gunnel can be obtained,
This is what led to the present invention.

υ, Kienri], he declares his intentions even more tearfully.

In the present invention, a foamed cellular cement slurry is injected into a mold, and a first cement layer having a thickness of 5 to 20 mm is formed in the mold.

In this case, the composition (c) of the foamed cellular cement slurry forming the first cement N is not limited to pulp, and a normal composition may be used, or a foamed cellular cement of low foaming and high density may be used. Slurry or slurry to which lightweight aggregates such as foamed silica and surface-treated IE-Lite are added, with a bulk specific gravity of 0.9 to 1.3 after air drying, can be suitably used; Panels with excellent water resistance, durability, and strength can be obtained, especially when using a slurry containing lightweight aggregates such as expanded silica or interfacially treated perlite. A panel with extremely excellent water resistance can be obtained by this method. Such a low foaming cell density cellular cement slurry includes, for example, 60 parts by weight of the above-mentioned Portland cement, 4 parts by weight of jet cement, etc.
After adding a water reducing agent (for example, Mighty 150, manufactured by Kao Soap Co., Ltd.) and water to a mixture of 20 parts by weight of granular foamed silica (light aggregate) k to 100 parts by weight of mixed cement consisting of 0 parts by weight, and kneading, To this, a foam material made by foaming a 1% aqueous solution of protein and surfactant (for example, Perfoam, manufactured by Kao Soap Co., Ltd.) using a foaming machine is added to increase the foam: ii O, 9 to 1.3
and the like are preferably used.

Note that the first cement layer may be normally formed on the bottom wall soil of the formwork.

In the present invention, the first cement layer is usually diffused for several minutes to harden the mud surface to some extent, and when a surface film with few bubbles is formed, the foamed cellular cement slurry is further poured onto the first cement layer. The second cement layer is formed by injecting the cement.

In this case, a few minutes of standing time is usually sufficient, and by forming a film with few bubbles on the surface and forming the second cement layer before it completely hardens, an integrally molded panel can be obtained. It is something that can be done.

Furthermore, in the present invention, after the second cement layer is opened for several minutes to harden its surface to some extent, a foamed cellular cement slurry is formed on the second cement layer. and then also as necessary p
The cement layers after the 4th cement layer are formed using foamed cellular cement slurry using the same method, but in this case, the cement layers after the 2nd cement layer are
The thickness is usually 15 to 35+ nm, and the fourth to fifth cement layers are formed, and the total thickness of the panel is 50 to 1.
It is preferable to set it as 00 opening.

The composition of the foamed cellular cement slurry that forms the cement layers after the second cement layer is not particularly limited, and any usual composition may be used, but Kotsu Portland cement, jet cement, halloysite or halloysite derivatives may be used. a lightweight aerated concrete composition containing;
In particular, a mixture of 50 to 80 parts by weight of ordinary Portland cement, especially 60 to 80 parts by weight, and 50 to 20 parts by weight, especially 40 to 20 parts by weight of jet cement. 5-3
A lightweight foamed cellular cement prepared by a preform method or a premix method by blending ordinary foaming agents such as proteins and surfactants with the above cellular concrete composition containing 0 parts by weight. A slurry can be preferably used.

In other words, the above-mentioned aerated concrete composition exhibits rapid hardening and high strength, and has excellent moldability and mold release properties. , it is possible to efficiently obtain a lightweight panel with excellent water resistance, durability, and strength. In this case, it is preferable to add porous minerals such as foamed silica and surface-treated pearlite to the above-mentioned cellular concrete composition in order to improve surface water retention. In addition, for the purpose of imparting long-term hardness to the cellular concrete composition 1, about 5 to 15% of the total weight of ordinary Portland cement and jet cement may be blended with powdered silica sand.

In addition, in the present invention, as described above, a low-foaming foamed cellular cement slurry of the above composition is used for the first cement layer, and a lightweight foamed cellular cement slurry of the above composition is used for the second cement layer. It is particularly preferable, but not limited thereto, that at least one layer is formed of a low-foaming, high-density foamed cellular cement slurry having the above composition, and the other layer is formed of a lightweight foamed cellular cement of the above composition. The slurry may be multi-formed, and all layers may be formed into a low-expanding high-density foamed cellular cement slurry or a light-weight expanded cellular cement slurry of the above composition. Furthermore, it goes without saying that each layer may be formed using a foamed cellular cement slurry of a different composition; It is preferable to mix lightweight aggregate to improve water resistance. In addition to the above-mentioned expanded silica and surface-treated perlite, expanded shale, expanded granular soil, expanded fly ash, expanded sludge, etc. can be used as the lightweight aggregate, but expanded silica is particularly preferred in terms of water repellency. It can be used for

In the present invention, after forming a plurality of cement layers through the above-mentioned operations, the cement layers are hardened, demolded, and further cured to form a cellular concrete tunnel with a multilayer structure having interfaces between each layer. It's something you get.

In this case, after forming the aerated concrete panel (multiple cement layers), it is usually left for 50 to 90 minutes and removed from the mold when it begins to harden or when hardening has progressed to a certain extent.
It is a way of taking care of yourself.

Here, the curing conditions are determined by a known method, such as water immersion curing,
Steam curing, hot water curing, electric curing, electric heat curing, high frequency curing
Although dry curing, infrared curing, etc. may be employed, in the present invention, it is particularly preferable to air dry curing as is or air dry after curing in water. Note that air drying is usually carried out for 3 to 7 days.

As described above, the method for manufacturing a cellular concrete panel according to the present invention involves forming a first cement layer with a thickness of 5 to 20 mm in a formwork using foamed cellular cement slurry, and leaving this for several minutes. In a state where the root surface has hardened to a certain extent, foamed cement slurry is applied to the first cement layer 1 iAJ to form a second cement layer, and then the same operation is repeated as necessary to form a plurality of layers. By forming a cement layer, removing the mold, and curing it to obtain a multi-layered cellular concrete panel with interface metal between each layer, we have created a cellular concrete with excellent waterproofness, durability, and strength. It is possible to obtain Tono Mother Nell. That is, according to the present invention, by dispensing the foamed cellular cement slurry into the formwork in two or more doses at intervals of time to form a plurality of cement layers, it is possible to prevent air bubbles from forming between each layer. This creates a cement film with fewer air bubbles, and this cement film with fewer air bubbles improves its durability, durability, and strength.

Next, examples will be shown to specifically explain the present invention.

〔Example〕

Inject the low-foaming high-density foamed cellular cement slurry shown below into the roof frame, and apply it to the bottom wall soil of the formwork to a smooth thickness of 10+n.
A first cement layer of m was formed.

Low-foaming high-density foamed cellular cement slurry Fupo Portland Cement (manufactured by Osaka Cement Co., Ltd.) 3009 and Jet Cement (manufactured by Onoda Cement Co., Ltd.) 200.9 were placed in a dice mixer and mixed thoroughly. 1 part water reducing agent (Mighty 150, manufactured by Kako Soap Co., Ltd.)
Add 801neK to the dissolved solution and mix well.
A foam material (approximately 5011/l) in which a 1% aqueous solution of special protein and surfactant (Perform, manufactured by Kako Soap Co., Ltd.) was foamed in this mortar using a foaming machine.1. The material was added and kneaded to have a bulk specific gravity of approximately 1.0.

Next, the surface of the first layer was allowed to harden to some extent for about 5 minutes, and when a dense surface film with few bubbles was formed, the foamed lightweight cellular cement slurry shown below was cast to a thickness of about 3011II++. At the same time, 3.4 cement layers were sequentially formed using the same slurry at intervals of about 5 minutes using the same procedure (the total thickness of layers 1 to 4 was about 100 mm). wn).

Foamed cement slurry (ordinary Portland cement) 650 II, 350 g of jet cement, and about 10 g of halloysite and barium hydroxide
Barium halloyzite (250mah all pas) obtained by reacting at 0°C for 15 minutes to 2 hours and washing with water.
s) 1009'C in a dicoro mixer, mix thoroughly, add water reducing agent (Mighty 150,
(manufactured by Kako Soap Co., Ltd.) 8J/'i water and knead well, and in this mortar, a 1% aqueous solution of special protein and surfactant is foamed using a foaming machine. This work was prepared by adding foam material and kneading it in a trench with a bulk specific gravity of about 0.7.Next, after forming the cement layers 1 to 4 of the coffins mentioned above,
After 0 minutes, the mold was removed, and immediately after that, it was immersed in water, a weight was placed on top, immersed for 3 days, taken out, and air-dried for 14 days to obtain the aerated concrete panel shown in the drawing. In addition, the bulk specific gravity of the low-foam high-density cellular concrete layer (first cement) VJ) indicated by a in the drawing is 1.0, and the high specific gravity of the lightweight cellular concrete layer (second to fourth cement layers) indicated by bxc is 07. there were. In addition, the boundary surfaces indicated by e in the drawings had small bubbles and were k-dense layers.

The aerated concrete panel was excellent in water resistance and surface durability, and had excellent properties equivalent to commercially available aerated concrete treated with an autoclave.

[Brief explanation of drawings]

The drawing is a sectional view showing an example of a cellular concrete panel manufactured by the method of the present invention. a...First cement M, b...Second cement layer, C
...Third cement layer, d...Fourth cement layer, e.
...Boundary surface. Applicant Sekisui House Co., Ltd. Agent Patent Attorney Kojima Kojima

Claims (1)

[Scope of Claims] 1. Forming a first cement layer with a thickness of 5 to 20+ nm using foamed cellular cement slurry in a mold,
This is left for a few minutes to harden the interface to some extent, and then the foamed cellular cement slurry is laminated on the first cement layer to form a second cement layer, and then the same operation is repeated as necessary. A method for producing an aerated concrete panel, which involves forming a plurality of cement layers, removing the mold, and curing them to obtain an aerated concrete panel with a multilayer structure having interfaces between each layer. 2. The manufacturing method according to claim 1, wherein one or more cement layers are formed from a low-foaming, high-density foamed cellular cement slurry. 3.1 or 2 above) Rjik, by foamed cellular cement slurry made by foaming a cellular concrete composition made by combining ordinary Portland cement, jet cement, and halloysite or a halloysite derivative by a preform method or a premix method. A manufacturing method according to claim 11JE, as defined in claim 11. 4. Aerated concrete composition, or a mixture of 50 to 80 parts by weight of ordinary Portland cement and 50 to 20 parts by weight of jet cement, with 5 to 30 parts of halloysite or halloysite derivatives added to the cement. A manufacturing method according to claim 3. 5. The manufacturing method according to any one of paragraphs 1 to 4 above, in which a lightweight bone phase is added to the foamed cellular cement slurry.